### Initialize and Start QR Code Scanning

Source: https://github.com/kingsic/sgqrcode/blob/master/README.md

Initializes the SGScanCode class, sets up the preview, assigns delegates, and starts the scanning process. Ensure the view controller conforms to SGScanCodeDelegate and SGScanCodeSampleBufferDelegate.

```Objective-C
// 创建二维码扫描类
scanCode = [SGScanCode scanCode];

// 预览视图，必须设置
scanCode.preview = self.view;

// 遵循 SGScanCodeDelegate
scanCode.delegate = self;

// 遵循 SGScanCodeSampleBufferDelegate
scanCode.sampleBufferDelegate = self;

// 开启扫描
[scanCode startRunning];
```

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

### Initialize and Configure QR Code Scanner

Source: https://github.com/kingsic/sgqrcode/wiki/3.5.1版本API说明

Initializes the SGScanCode class and sets up a block for handling scan results. It also includes methods to start the scanning process and monitor ambient light levels.

```Objective-C
    /// 创建二维码扫描类 
    scanCode = [SGScanCode scanCode];
    
    /// 二维码扫描回调方法 
    [scanCode scanWithController:self resultBlock:^(SGScanCode *scanCode, NSString *result) {
        <#code#>
    }];
    
    /// 开启二维码扫描回调方法: 需手动开启
    [scanCode startRunningWithBefore:^{ 
        // 在此可添加 HUD
    } completion:^{ 
        // 在此可移除 HUD
    }];
    
    /// 外界光线强弱值回调方法
    [scanCode scanWithBrightnessBlock:^(SGScanCode *scanCode, CGFloat brightness) {
        <#code#>
    }];
    
    /// 从相册中读取二维码回调方法    
    [scanCode readWithResultBlock:^(SGScanCode *scanCode, NSString *result) {
        <#code#>
    }];
```

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

### Generate QR Codes

Source: https://github.com/kingsic/sgqrcode/wiki/3.5.1版本API说明

Provides methods to create QR codes, both as standard codes and with an embedded logo. Ensure you have the necessary data and size parameters.

```Objective-C
    /// 常规二维码
    _imageView.image = [SGCreateCode createQRCodeWithData:@"https://github.com/kingsic" size:size];
    
    /// 带 logo 的二维码
    _imageView.image = [SGCreateCode createQRCodeWithData:@"https://github.com/kingsic" size:size logoImage:logoImage ratio:ratio];
```

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

### Generate Normal QR Code

Source: https://github.com/kingsic/sgqrcode/blob/master/README.md

Generates a standard QR code with the specified data and size. No logo is included.

```Objective-C
// 普通二维码生成方法
[SGGenerateQRCode generateQRCodeWithData:data size:size];
```

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

### Recognize QR Code from Image

Source: https://github.com/kingsic/sgqrcode/blob/master/README.md

Reads and recognizes a QR code from a given image. The result is returned asynchronously via a completion block.

```Objective-C
[scanCode readQRCode:image completion:^(NSString *result) {
    <#code#>
}];
```

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

### Generate QR Code with Logo

Source: https://github.com/kingsic/sgqrcode/blob/master/README.md

Generates a QR code with a logo embedded in the center. The ratio parameter controls the size of the logo relative to the QR code.

```Objective-C
// 带 logo 的二维码生成方法
[SGGenerateQRCode generateQRCodeWithData:data size:size logoImage:logoImage ratio:ratio];
```

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

### Handle QR Code Brightness

Source: https://github.com/kingsic/sgqrcode/blob/master/README.md

Delegate method called to report the brightness level detected during scanning. This can be used to adjust UI elements or provide feedback to the user.

```Objective-C
// SGScanCodeSampleBufferDelegate
- (void)scanCode:(SGScanCode *)scanCode brightness:(CGFloat)brightness {
    <#code#>
}
```

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

### Handle Scanned QR Code Result

Source: https://github.com/kingsic/sgqrcode/blob/master/README.md

Delegate method called when a QR code is successfully scanned. The scanned result is provided as a string.

```Objective-C
// SGScanCodeDelegate
- (void)scanCode:(SGScanCode *)scanCode result:(NSString *)result {
    <#code#>
}
```

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

### Stop QR Code Scanning

Source: https://github.com/kingsic/sgqrcode/blob/master/README.md

Stops the QR code scanning process. This should be called when the scanning functionality is no longer needed, typically in the view controller's dealloc or viewWillDisappear method.

```Objective-C
// 结束扫描
[scanCode stopRunning];
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.