Objective-C 截图实现

截取整个屏幕大小:

UIGraphicsBeginImageContext(self.view.bounds.size); 
        [self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; 
        UIImage * viewImage = UIGraphicsGetImageFromCurrentImageContext(); 
        UIGraphicsEndImageContext(); 
        UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil) 

截取自定义大小：

UIGraphicsBeginImageContext(_attributedLabel.frame.size); 
        [_attributedLabel.layer renderInContext:UIGraphicsGetCurrentContext()]; 
        UIImage * viewImage = UIGraphicsGetImageFromCurrentImageContext(); 
        UIGraphicsEndImageContext(); 
        UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil); 

项目需要导入QuartzCore.framework