### Create and Execute a GET Request

Source: https://context7.com/kanyun-inc/ytknetwork/llms.txt

Define a custom request class by subclassing YTKRequest and execute it using completion blocks.

```objectivec
// GetUserInfoApi.h
#import "YTKRequest.h"

@interface GetUserInfoApi : YTKRequest
- (instancetype)initWithUserId:(NSString *)userId;
@end

// GetUserInfoApi.m
#import "GetUserInfoApi.h"

@implementation GetUserInfoApi {
    NSString *_userId;
}

- (instancetype)initWithUserId:(NSString *)userId {
    self = [super init];
    if (self) {
        _userId = userId;
    }
    return self;
}

- (NSString *)requestUrl {
    return @"/api/users";
}

- (id)requestArgument {
    return @{ @"id": _userId };
}

// Optional: Validate JSON response structure
- (id)jsonValidator {
    return @{
        @"nick": [NSString class],
        @"level": [NSNumber class]
    };
}

@end

// Usage in ViewController
- (void)fetchUserInfo {
    GetUserInfoApi *api = [[GetUserInfoApi alloc] initWithUserId:@"12345"];
    [api startWithCompletionBlockWithSuccess:^(YTKBaseRequest *request) {
        NSDictionary *userInfo = request.responseJSONObject;
        NSLog(@"User: %@, Level: %@", userInfo[@"nick"], userInfo[@"level"]);
    } failure:^(YTKBaseRequest *request) {
        NSLog(@"Error: %@", request.error.localizedDescription);
    }];
}
```

--------------------------------

### Implement Resumable File Download in Objective-C

Source: https://context7.com/kanyun-inc/ytknetwork/llms.txt

Override resumableDownloadPath to enable automatic download resumption. Includes an example of tracking download progress.

```objectivec
// DownloadFileApi.h
#import "YTKRequest.h"

@interface DownloadFileApi : YTKRequest
- (instancetype)initWithFileId:(NSString *)fileId;
@end

// DownloadFileApi.m
@implementation DownloadFileApi {
    NSString *_fileId;
}

- (instancetype)initWithFileId:(NSString *)fileId {
    self = [super init];
    if (self) {
        _fileId = fileId;
    }
    return self;
}

- (NSString *)requestUrl {
    return [NSString stringWithFormat:@"/api/files/%@", _fileId];
}

// Use CDN for downloads
- (BOOL)useCDN {
    return YES;
}

// Enable resumable download by specifying save path
- (NSString *)resumableDownloadPath {
    NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject];
    return [cachePath stringByAppendingPathComponent:_fileId];
}

@end

// Usage with download progress
- (void)downloadFile:(NSString *)fileId {
    DownloadFileApi *api = [[DownloadFileApi alloc] initWithFileId:fileId];

    // Track download progress
    api.resumableDownloadProgressBlock = ^(NSProgress *progress) {
        CGFloat percentage = progress.fractionCompleted * 100;
        NSLog(@"Download progress: %.1f%% (%lld / %lld bytes)",
              percentage, progress.completedUnitCount, progress.totalUnitCount);
    };

    [api startWithCompletionBlockWithSuccess:^(YTKBaseRequest *request) {
        NSURL *fileURL = request.responseObject;  // Path to downloaded file
        NSLog(@"File downloaded to: %@", fileURL.path);
    } failure:^(YTKBaseRequest *request) {
        NSLog(@"Download failed: %@", request.error);
    }];
}
```

--------------------------------

### Get User Info API Implementation

Source: https://github.com/kanyun-inc/ytknetwork/blob/master/Docs/BasicGuide_en.md

A complete implementation of a GetUserInfoApi that fetches user data, including request URL, arguments, and JSON validation for 'nick' and 'level' fields.

```objectivec
// GetUserInfoApi.h
#import "YTKRequest.h"

@interface GetUserInfoApi : YTKRequest

- (id)initWithUserId:(NSString *)userId;

@end


// GetUserInfoApi.m
#import "GetUserInfoApi.h"

@implementation GetUserInfoApi {
    NSString *_userId;
}

- (id)initWithUserId:(NSString *)userId {
    self = [super init];
    if (self) {
        _userId = userId;
    }
    return self;
}

- (NSString *)requestUrl {
    return @"/iphone/users";
}

- (id)requestArgument {
    return @{ @"id": _userId };
}

- (id)jsonValidator {
    return @{
        @"nick": [NSString class],
        @"level": [NSNumber class]
    };
}

@end
```

--------------------------------

### Implement Multipart File Upload in Objective-C

Source: https://context7.com/kanyun-inc/ytknetwork/llms.txt

Use constructingBodyBlock to access AFNetworking's multipart form data builder for file uploads. Includes an example of tracking upload progress.

```objectivec
// UploadImageApi.h
#import "YTKRequest.h"
#import <UIKit/UIKit.h>

@interface UploadImageApi : YTKRequest
- (instancetype)initWithImage:(UIImage *)image;
- (NSString *)responseImageId;
@end

// UploadImageApi.m
#import "UploadImageApi.h"
#import <AFNetworking/AFURLRequestSerialization.h>

@implementation UploadImageApi {
    UIImage *_image;
}

- (instancetype)initWithImage:(UIImage *)image {
    self = [super init];
    if (self) {
        _image = image;
    }
    return self;
}

- (YTKRequestMethod)requestMethod {
    return YTKRequestMethodPOST;
}

- (NSString *)requestUrl {
    return @"/api/images/upload";
}

- (AFConstructingBlock)constructingBodyBlock {
    return ^(id<AFMultipartFormData> formData) {
        NSData *imageData = UIImageJPEGRepresentation(_image, 0.9);
        [formData appendPartWithFileData:imageData
                                    name:@"image"
                                fileName:@"photo.jpg"
                                mimeType:@"image/jpeg"];
    };
}

- (id)jsonValidator {
    return @{ @"imageId": [NSString class] };
}

- (NSString *)responseImageId {
    return self.responseJSONObject[@"imageId"];
}

@end

// Usage with upload progress
- (void)uploadImage:(UIImage *)image {
    UploadImageApi *api = [[UploadImageApi alloc] initWithImage:image];

    // Track upload progress
    api.uploadProgressBlock = ^(NSProgress *progress) {
        CGFloat percentage = progress.fractionCompleted * 100;
        NSLog(@"Upload progress: %.1f%%", percentage);
    };

    [api startWithCompletionBlockWithSuccess:^(YTKBaseRequest *request) {
        UploadImageApi *result = (UploadImageApi *)request;
        NSLog(@"Image uploaded! ID: %@", [result responseImageId]);
    } failure:^(YTKBaseRequest *request) {
        NSLog(@"Upload failed: %@", request.error);
    }];
}
```

--------------------------------

### Configure YTKNetwork global settings

Source: https://github.com/kanyun-inc/ytknetwork/blob/master/Docs/BasicGuide_en.md

Set the base URL and CDN URL during application startup to avoid repeating host addresses.

```objectivec
- (BOOL)application:(UIApplication *)application 
   didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
   YTKNetworkConfig *config = [YTKNetworkConfig sharedConfig];
   config.baseUrl = @"http://yuantiku.com";
   config.cdnUrl = @"http://fen.bi";
}
```

--------------------------------

### Configure Global Network Settings

Source: https://context7.com/kanyun-inc/ytknetwork/llms.txt

Initialize base URLs and debug settings using YTKNetworkConfig in the application delegate.

```objectivec
// AppDelegate.m
#import "YTKNetworkConfig.h"

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Configure global network settings
    YTKNetworkConfig *config = [YTKNetworkConfig sharedConfig];
    config.baseUrl = @"https://api.example.com";
    config.cdnUrl = @"https://cdn.example.com";
    config.debugLogEnabled = YES;

    // Optional: Configure security policy
    // config.securityPolicy = [AFSecurityPolicy policyWithPinningMode:AFSSLPinningModeCertificate];

    // Optional: Configure session
    // config.sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];

    return YES;
}
```

--------------------------------

### Call RegisterApi with Delegate

Source: https://github.com/kanyun-inc/ytknetwork/blob/master/Docs/BasicGuide_en.md

Initiates a registration API call with username and password, handling responses through delegate methods. Ensure the delegate conforms to the appropriate YTKRequest delegate protocols.

```objectivec
- (void)loginButtonPressed:(id)sender {
    NSString *username = self.UserNameTextField.text;
    NSString *password = self.PasswordTextField.text;
    if (username.length > 0 && password.length > 0) {
        RegisterApi *api = [[RegisterApi alloc] initWithUsername:username password:password];
        api.delegate = self;
        [api start];
    }
}

- (void)requestFinished:(YTKBaseRequest *)request {
    NSLog(@"succeed");
}

- (void)requestFailed:(YTKBaseRequest *)request {
    NSLog(@"failed");
}
```

--------------------------------

### Call RegisterApi with Completion Block

Source: https://github.com/kanyun-inc/ytknetwork/blob/master/Docs/BasicGuide_en.md

Initiates a registration API call with username and password, handling success and failure via completion blocks. Retain cycles are avoided as blocks are nilled after completion.

```objectivec
- (void)loginButtonPressed:(id)sender {
    NSString *username = self.UserNameTextField.text;
    NSString *password = self.PasswordTextField.text;
    if (username.length > 0 && password.length > 0) {
        RegisterApi *api = [[RegisterApi alloc] initWithUsername:username password:password];
        [api startWithCompletionBlockWithSuccess:^(YTKBaseRequest *request) {
            // you can use self here, retain cycle won't happen
            NSLog(@"succeed");
            
        } failure:^(YTKBaseRequest *request) {
            // you can use self here, retain cycle won't happen
            NSLog(@"failed");
        }];
    }
}
```

--------------------------------

### Implement Delegate-Based Callbacks for Network Requests

Source: https://context7.com/kanyun-inc/ytknetwork/llms.txt

Use the `YTKRequestDelegate` protocol for handling network request callbacks, which is beneficial for managing multiple requests or avoiding retain cycles. Assign the delegate and use tags to identify specific requests.

```objectivec
// ViewController.m
@interface MyViewController () <YTKRequestDelegate>
@property (nonatomic, strong) GetUserInfoApi *userApi;
@end

@implementation MyViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self loadUserData];
}

- (void)loadUserData {
    self.userApi = [[GetUserInfoApi alloc] initWithUserId:@"12345"];
    self.userApi.delegate = self;
    self.userApi.tag = 100;  // Use tag to identify requests
    [self.userApi start];
}

#pragma mark - YTKRequestDelegate

- (void)requestFinished:(YTKBaseRequest *)request {
    if (request.tag == 100) {
        NSDictionary *userInfo = request.responseJSONObject;
        NSLog(@"User loaded: %@", userInfo[@"nick"]);
        // Update UI
    }
}

- (void)requestFailed:(YTKBaseRequest *)request {
    NSLog(@"Request failed: %@", request.error.localizedDescription);
    // Show error UI
}

@end
```

--------------------------------

### Implement YTKRequestAccessory for Loading Indicators

Source: https://context7.com/kanyun-inc/ytknetwork/llms.txt

Create a custom accessory class conforming to YTKRequestAccessory to trigger UI updates during request lifecycle events.

```objectivec
// YTKAnimatingRequestAccessory.h
#import "YTKBaseRequest.h"

@interface YTKAnimatingRequestAccessory : NSObject <YTKRequestAccessory>
@property (nonatomic, weak) UIView *animatingView;
- (instancetype)initWithAnimatingView:(UIView *)view;
@end

// YTKAnimatingRequestAccessory.m
@implementation YTKAnimatingRequestAccessory

- (instancetype)initWithAnimatingView:(UIView *)view {
    self = [super init];
    if (self) {
        _animatingView = view;
    }
    return self;
}

- (void)requestWillStart:(id)request {
    dispatch_async(dispatch_get_main_queue(), ^{
        [self showLoadingOnView:self.animatingView];
    });
}

- (void)requestWillStop:(id)request {
    // Called before completion block
}

- (void)requestDidStop:(id)request {
    dispatch_async(dispatch_get_main_queue(), ^{
        [self hideLoadingOnView:self.animatingView];
    });
}

- (void)showLoadingOnView:(UIView *)view {
    // Show HUD or spinner
}

- (void)hideLoadingOnView:(UIView *)view {
    // Hide HUD or spinner
}

@end

// Usage
- (void)fetchDataWithLoading {
    GetUserInfoApi *api = [[GetUserInfoApi alloc] initWithUserId:@"12345"];

    // Add loading indicator accessory
    YTKAnimatingRequestAccessory *loadingAccessory = [[YTKAnimatingRequestAccessory alloc]
                                                       initWithAnimatingView:self.view];
    [api addAccessory:loadingAccessory];

    [api startWithCompletionBlockWithSuccess:^(YTKBaseRequest *request) {
        // Loading indicator hidden automatically
        NSLog(@"Data loaded: %@", request.responseJSONObject);
    } failure:^(YTKBaseRequest *request) {
        // Loading indicator hidden automatically
        NSLog(@"Error: %@", request.error);
    }];
}
```

--------------------------------

### Create POST Request with Arguments

Source: https://context7.com/kanyun-inc/ytknetwork/llms.txt

Override `requestMethod` to POST and provide arguments via `requestArgument`. Arguments are serialized and sent as the request body. Includes response JSON validation.

```objectivec
// RegisterApi.h
#import "YTKRequest.h"

@interface RegisterApi : YTKRequest
- (instancetype)initWithUsername:(NSString *)username password:(NSString *)password;
- (NSString *)userId;
@end
```

```objectivec
// RegisterApi.m
#import "RegisterApi.h"

@implementation RegisterApi {
    NSString *_username;
    NSString *_password;
}

- (instancetype)initWithUsername:(NSString *)username password:(NSString *)password {
    self = [super init];
    if (self) {
        _username = username;
        _password = password;
    }
    return self;
}

- (NSString *)requestUrl {
    return @"/api/register";
}

- (YTKRequestMethod)requestMethod {
    return YTKRequestMethodPOST;
}

- (id)requestArgument {
    return @{
        @"username": _username,
        @"password": _password
    };
}

- (id)jsonValidator {
    return @{
        @"userId": [NSNumber class],
        @"nick": [NSString class],
        @"level": [NSNumber class]
    };
}

- (NSString *)userId {
    return [[[self responseJSONObject] objectForKey:@"userId"] stringValue];
}

@end
```

```objectivec
// Usage
- (void)registerUser {
    RegisterApi *api = [[RegisterApi alloc] initWithUsername:@"john_doe" password:@"securePass123"];
    [api startWithCompletionBlockWithSuccess:^(YTKBaseRequest *request) {
        RegisterApi *result = (RegisterApi *)request;
        NSLog(@"Registration successful! User ID: %@", [result userId]);
    } failure:^(YTKBaseRequest *request) {
        NSLog(@"Registration failed: %@", request.error.localizedDescription);
    }];
}
```

--------------------------------

### Add Custom HTTP Headers and Basic Authentication

Source: https://context7.com/kanyun-inc/ytknetwork/llms.txt

Override `requestHeaderFieldValueDictionary` for custom headers or `requestAuthorizationHeaderFieldArray` for HTTP Basic Authentication. Ensure the `authToken` method correctly retrieves the authentication token.

```objectivec
// AuthenticatedApi.m
@implementation AuthenticatedApi

- (NSString *)requestUrl {
    return @"/api/secure/data";
}

// Add custom HTTP headers
- (NSDictionary<NSString *, NSString *> *)requestHeaderFieldValueDictionary {
    return @{
        @"Authorization": [NSString stringWithFormat:@"Bearer %@", [self authToken]],
        @"X-Client-Version": @"2.0.0",
        @"Accept-Language": @"en-US"
    };
}

// Or use HTTP Basic Auth
- (NSArray<NSString *> *)requestAuthorizationHeaderFieldArray {
    return @[@"username", @"password"];  // Will set Authorization: Basic base64(username:password)
}

- (NSString *)authToken {
    return [[NSUserDefaults standardUserDefaults] stringForKey:@"auth_token"];
}

@end
```

--------------------------------

### Enable Resumable Downloading in YTKNetwork

Source: https://github.com/kanyun-inc/ytknetwork/blob/master/Docs/BasicGuide_en.md

Overwrite the `resumableDownloadPath` method to specify where downloaded files should be saved. The file will be automatically stored at the provided path.

```objectivec
@implementation GetImageApi {
    NSString *_imageId;
}

- (id)initWithImageId:(NSString *)imageId {
    self = [super init];
    if (self) {
        _imageId = imageId;
    }
    return self;
}

- (NSString *)requestUrl {
    return [NSString stringWithFormat:@"/iphone/images/%@", _imageId];
}

- (BOOL)useCDN {
    return YES;
}

- (NSString *)resumableDownloadPath {
    NSString *libPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *cachePath = [libPath stringByAppendingPathComponent:@"Caches"];
    NSString *filePath = [cachePath stringByAppendingPathComponent:_imageId];
    return filePath;
}

@end
```

--------------------------------

### Execute Dependent Requests Sequentially with YTKChainRequest

Source: https://context7.com/kanyun-inc/ytknetwork/llms.txt

Use YTKChainRequest to execute requests in a specific order, where each request can depend on the response of the previous one. Implement YTKChainRequestDelegate to handle success and failure callbacks for the entire chain.

```objectivec
#import "YTKChainRequest.h"
#import "RegisterApi.h"
#import "GetUserInfoApi.h"

@interface MyViewController () <YTKChainRequestDelegate>
@end

@implementation MyViewController

- (void)registerAndFetchProfile {
    RegisterApi *registerApi = [[RegisterApi alloc] initWithUsername:@"john_doe"
                                                            password:@"securePass123"];

    YTKChainRequest *chainRequest = [[YTKChainRequest alloc] init];

    // First request: Register user
    [chainRequest addRequest:registerApi callback:^(YTKChainRequest *chain, YTKBaseRequest *baseRequest) {
        RegisterApi *result = (RegisterApi *)baseRequest;
        NSString *userId = [result userId];
        NSLog(@"Registration successful, user ID: %@", userId);

        // Second request: Fetch user profile using the returned user ID
        GetUserInfoApi *profileApi = [[GetUserInfoApi alloc] initWithUserId:userId];
        [chain addRequest:profileApi callback:^(YTKChainRequest *chain, YTKBaseRequest *baseRequest) {
            GetUserInfoApi *profile = (GetUserInfoApi *)baseRequest;
            NSLog(@"Profile loaded: %@", profile.responseJSONObject);

            // Can add more dependent requests here
        }];
    }];

    chainRequest.delegate = self;
    [chainRequest start];
}

#pragma mark - YTKChainRequestDelegate

- (void)chainRequestFinished:(YTKChainRequest *)chainRequest {
    NSLog(@"All chained requests completed successfully!");
    NSArray *allRequests = [chainRequest requestArray];
    // Process final results
}

- (void)chainRequestFailed:(YTKChainRequest *)chainRequest failedBaseRequest:(YTKBaseRequest *)request {
    NSLog(@"Chain failed at request: %@, error: %@", request.requestUrl, request.error);
}

@end
```

--------------------------------

### Define a custom network request class

Source: https://github.com/kanyun-inc/ytknetwork/blob/master/Docs/BasicGuide_en.md

Create a subclass of YTKRequest and override methods like requestUrl, requestMethod, and requestArgument to define specific API interactions.

```objectivec
// RegisterApi.h
#import "YTKRequest.h"

@interface RegisterApi : YTKRequest

- (id)initWithUsername:(NSString *)username password:(NSString *)password;

@end


// RegisterApi.m


#import "RegisterApi.h"

@implementation RegisterApi {
    NSString *_username;
    NSString *_password;
}

- (id)initWithUsername:(NSString *)username password:(NSString *)password {
    self = [super init];
    if (self) {
        _username = username;
        _password = password;
    }
    return self;
}

- (NSString *)requestUrl {
    // “http://www.yuantiku.com” is set in YTKNetworkConfig, so we ignore it
    return @"/iphone/register";
}

- (YTKRequestMethod)requestMethod {
    return YTKRequestMethodPOST;
}

- (id)requestArgument {
    return @{
        @"username": _username,
        @"password": _password
    };
}

@end
```

--------------------------------

### Build Custom NSURLRequest in Objective-C

Source: https://context7.com/kanyun-inc/ytknetwork/llms.txt

Override buildCustomUrlRequest to manually configure request headers, methods, and body content.

```objectivec
// GzipUploadApi.m
- (NSURLRequest *)buildCustomUrlRequest {
    // Convert data to gzipped format
    NSData *rawData = [[_events jsonString] dataUsingEncoding:NSUTF8StringEncoding];
    NSData *gzippedData = [rawData gzippedData];  // Using a gzip library

    // Build custom request
    NSURL *url = [NSURL URLWithString:[self.baseUrl stringByAppendingString:@"/api/events"]];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setHTTPMethod:@"POST"];
    [request addValue:@"application/json;charset=UTF-8" forHTTPHeaderField:@"Content-Type"];
    [request addValue:@"gzip" forHTTPHeaderField:@"Content-Encoding"];
    [request setHTTPBody:gzippedData];

    return request;
}
```

--------------------------------

### Use CDN Address for Requests

Source: https://github.com/kanyun-inc/ytknetwork/blob/master/Docs/BasicGuide_en.md

Enables the use of a Content Delivery Network (CDN) for requests by overriding the `useCDN` method and returning YES. This is useful for assets like images.

```objectivec
// GetImageApi.h
#import "YTKRequest.h"

@interface GetImageApi : YTKRequest
- (id)initWithImageId:(NSString *)imageId;
@end

// GetImageApi.m
#import "GetImageApi.h"

@implementation GetImageApi {
    NSString *_imageId;
}

- (id)initWithImageId:(NSString *)imageId {
    self = [super init];
    if (self) {
        _imageId = imageId;
    }
    return self;
}

- (NSString *)requestUrl {
    return [NSString stringWithFormat:@"/iphone/images/%@", _imageId];
}

- (BOOL)useCDN {
    return YES;
}

@end
```

--------------------------------

### Implement Response Caching

Source: https://context7.com/kanyun-inc/ytknetwork/llms.txt

Enable automatic response caching by overriding `cacheTimeInSeconds`. Cached responses are served until expiration. Supports version-based invalidation and additional cache sensitivity data.

```objectivec
// CachedUserInfoApi.m
@implementation CachedUserInfoApi {
    NSString *_userId;
}

- (instancetype)initWithUserId:(NSString *)userId {
    self = [super init];
    if (self) {
        _userId = userId;
    }
    return self;
}

- (NSString *)requestUrl {
    return @"/api/users";
}

- (id)requestArgument {
    return @{ @"id": _userId };
}

// Cache for 3 minutes (180 seconds)
- (NSInteger)cacheTimeInSeconds {
    return 60 * 3;
}

// Optional: Version-based cache invalidation
- (long long)cacheVersion {
    return 1;
}

// Optional: Additional cache sensitivity data
- (id)cacheSensitiveData {
    return @{ @"appVersion": @"2.0" };
}

@end
```

```objectivec
// Usage: Load cached data first, then refresh
- (void)loadUserWithCache {
    CachedUserInfoApi *api = [[CachedUserInfoApi alloc] initWithUserId:@"12345"];

    // Try to load from cache first
    if ([api loadCacheWithError:nil]) {
        NSDictionary *cachedData = [api responseJSONObject];
        NSLog(@"Showing cached data: %@", cachedData);
        // Update UI with cached data immediately
    }

    // Then fetch fresh data
    [api startWithCompletionBlockWithSuccess:^(YTKBaseRequest *request) {
        if ([request isDataFromCache]) {
            NSLog(@"Data served from cache");
        } else {
            NSLog(@"Fresh data received");
            // Update UI with new data
        }
    } failure:^(YTKBaseRequest *request) {
        NSLog(@"Request failed: %@", request.error);
    }];
}
```

```objectivec
// Force refresh without using cache
- (void)forceRefreshUser {
    CachedUserInfoApi *api = [[CachedUserInfoApi alloc] initWithUserId:@"12345"];
    api.ignoreCache = YES;  // Or use [api startWithoutCache];
    [api start];
}
```

--------------------------------

### Add Common Parameters to All Requests with YTKUrlArgumentsFilter

Source: https://context7.com/kanyun-inc/ytknetwork/llms.txt

Use YTKUrlArgumentsFilter to append common query parameters like version numbers or device IDs to all outgoing requests. Ensure YTKNetworkConfig is set up with this filter.

```objectivec
// YTKUrlArgumentsFilter.h
#import <Foundation/Foundation.h>
#import "YTKNetworkConfig.h"

@interface YTKUrlArgumentsFilter : NSObject <YTKUrlFilterProtocol>
+ (instancetype)filterWithArguments:(NSDictionary *)arguments;
@end

// YTKUrlArgumentsFilter.m
@implementation YTKUrlArgumentsFilter {
    NSDictionary *_arguments;
}

+ (instancetype)filterWithArguments:(NSDictionary *)arguments {
    return [[self alloc] initWithArguments:arguments];
}

- (instancetype)initWithArguments:(NSDictionary *)arguments {
    self = [super init];
    if (self) {
        _arguments = arguments;
    }
    return self;
}

- (NSString *)filterUrl:(NSString *)originUrl withRequest:(YTKBaseRequest *)request {
    // Append query parameters to URL
    NSMutableString *filteredUrl = [originUrl mutableCopy];
    NSString *separator = [originUrl containsString:@"?"] ? @"&" : @"?";

    for (NSString *key in _arguments) {
        [filteredUrl appendFormat:@"%@%@=%@", separator, key, _arguments[key]];
        separator = @"&";
    }

    return filteredUrl;
}

@end

// Setup in AppDelegate
- (void)setupRequestFilters {
    YTKNetworkConfig *config = [YTKNetworkConfig sharedConfig];

    // Add app version to all requests
    NSString *appVersion = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleShortVersionString"];
    NSString *deviceId = [[[UIDevice currentDevice] identifierForVendor] UUIDString];

    YTKUrlArgumentsFilter *filter = [YTKUrlArgumentsFilter filterWithArguments:@{
        @"version": appVersion,
        @"platform": @"ios",
        @"device_id": deviceId
    }];

    [config addUrlFilter:filter];
}
```

--------------------------------

### Execute Multiple Requests in Parallel with YTKBatchRequest

Source: https://context7.com/kanyun-inc/ytknetwork/llms.txt

Use YTKBatchRequest to send multiple independent requests concurrently. The success callback is invoked only if all requests in the batch complete successfully. Access individual results from the batch's requestArray.

```objectivec
#import "YTKBatchRequest.h"
#import "GetUserInfoApi.h"
#import "DownloadFileApi.h"

- (void)loadDashboardData {
    // Create multiple independent requests
    GetUserInfoApi *userApi = [[GetUserInfoApi alloc] initWithUserId:@"12345"];
    DownloadFileApi *avatarApi = [[DownloadFileApi alloc] initWithFileId:@"avatar.jpg"];
    DownloadFileApi *bannerApi = [[DownloadFileApi alloc] initWithFileId:@"banner.jpg"];
    GetUserInfoApi *friendApi = [[GetUserInfoApi alloc] initWithUserId:@"67890"];

    // Batch them together
    YTKBatchRequest *batchRequest = [[YTKBatchRequest alloc] initWithRequestArray:@[
        userApi, avatarApi, bannerApi, friendApi
    ]];

    [batchRequest startWithCompletionBlockWithSuccess:^(YTKBatchRequest *batch) {
        NSLog(@"All requests completed successfully!");

        // Access individual results
        NSArray *requests = batch.requestArray;
        GetUserInfoApi *user = (GetUserInfoApi *)requests[0];
        DownloadFileApi *avatar = (DownloadFileApi *)requests[1];
        DownloadFileApi *banner = (DownloadFileApi *)requests[2];
        GetUserInfoApi *friend = (GetUserInfoApi *)requests[3];

        NSLog(@"User: %@", user.responseJSONObject);
        NSLog(@"Avatar path: %@", avatar.responseObject);
        NSLog(@"Banner path: %@", banner.responseObject);
        NSLog(@"Friend: %@", friend.responseJSONObject);

        // Check if data came from cache
        if ([batch isDataFromCache]) {
            NSLog(@"All data served from cache");
        }
    } failure:^(YTKBatchRequest *batch) {
        YTKRequest *failedRequest = batch.failedRequest;
        NSLog(@"Batch failed. First failing request: %@", failedRequest.error);
    }];
}
```

--------------------------------

### Define JSON Response Structure for Validation

Source: https://context7.com/kanyun-inc/ytknetwork/llms.txt

Implement the `jsonValidator` method to define the expected structure and types of a JSON response. Requests will automatically fail if the response does not conform to the specified validator.

```objectivec
// ComplexValidationApi.m
- (id)jsonValidator {
    // Validate complex nested structure
    return @[@{
        @"id": [NSNumber class],
        @"imageId": [NSString class],
        @"time": [NSNumber class],
        @"status": [NSNumber class],
        @"question": @{
            @"id": [NSNumber class],
            @"content": [NSString class],
            @"contentType": [NSNumber class]
        }
    }];
}

// Simple array of strings validation
- (id)jsonValidatorForStringArray {
    return @[ [NSString class] ];
}

// Simple object validation
- (id)jsonValidatorForUserObject {
    return @{
        @"nick": [NSString class],
        @"level": [NSNumber class],
        @"email": [NSString class]
    };
}
```

--------------------------------

### Cache API Response Data in YTKNetwork

Source: https://github.com/kanyun-inc/ytknetwork/blob/master/Docs/BasicGuide_en.md

Overwrite the `cacheTimeInSeconds` method to enable automatic caching of API responses. If cached data is valid, API calls will return cached results without network traffic.

```objectivec
@implementation GetUserInfoApi {
    NSString *_userId;
}

- (id)initWithUserId:(NSString *)userId {
    self = [super init];
    if (self) {
        _userId = userId;
    }
    return self;
}

- (NSString *)requestUrl {
    return @"/iphone/users";
}

- (id)requestArgument {
    return @{ @"id": _userId };
}

- (id)jsonValidator {
    return @{
        @"nick": [NSString class],
        @"level": [NSNumber class]
    };
}

- (NSInteger)cacheTimeInSeconds {
    // cache 3 minutes, which is 60 * 3 = 180 seconds
    return 60 * 3;
}

@end
```

--------------------------------

### Validate JSON Response Structure

Source: https://github.com/kanyun-inc/ytknetwork/blob/master/Docs/BasicGuide_en.md

Ensures the response JSON adheres to a specific structure and data types for keys like 'nick' (NSString) and 'level' (NSNumber). This prevents client crashes due to faulty server data.

```objectivec
- (id)jsonValidator {
    return @{
        @"nick": [NSString class],
        @"level": [NSNumber class]
    };
}
```

--------------------------------

### Validate String Array Response

Source: https://github.com/kanyun-inc/ytknetwork/blob/master/Docs/BasicGuide_en.md

Specifies that the expected JSON response should be an array of strings.

```objectivec
- (id)jsonValidator {
    return @[ [NSString class] ];
}
```

--------------------------------

### Validate Complex Nested JSON Structure

Source: https://github.com/kanyun-inc/ytknetwork/blob/master/Docs/BasicGuide_en.md

Validates a complex JSON structure with nested objects and arrays, ensuring specific data types for each field.

```objectivec
- (id)jsonValidator {
    return @[@{
        @"id": [NSNumber class],
        @"imageId": [NSString class],
        @"time": [NSNumber class],
        @"status": [NSNumber class],
        @"question": @{
            @"id": [NSNumber class],
            @"content": [NSString class],
            @"contentType": [NSNumber class]
        }
    }];
}
```

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