iOS实现截屏并保存到相册

写入相册需要导入的头文件：

#import

...

1. iOS7之后的截屏方法，返回view

    UIView *view = [ self . view snapshotViewAfterScreenUpdates : YES ];

    [self.view addSubview:view];

2. 返回UIImage的截屏方法

/**
 *  截屏
 *
 *  @param view 需要截屏的视图
 *
 *  @return 截屏后的图片
 */
- ( UIImage *)captureImageInView:( UIView *)view
{
    UIGraphicsBeginImageContextWithOptions (view. bounds . size , YES , 0);
    [view. layer renderInContext : UIGraphicsGetCurrentContext ()];
    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext ();
    UIGraphicsEndImageContext ();
    CGImageRef imageRef = viewImage. CGImage ;
    CGRect rect = view. bounds ;  // 在 view 上的截图的区域
    CGImageRef imageRefRect = CGImageCreateWithImageInRect (imageRef, rect);
    UIImage *sendImage = [[ UIImage alloc ] initWithCGImage :imageRefRect];
    NSData *imageViewData = UIImagePNGRepresentation (sendImage);
   
    NSArray *paths = NSSearchPathForDirectoriesInDomains ( NSDocumentDirectory , NSUserDomainMask , YES );
    NSString *documentsDirectory = [paths objectAtIndex :0];
    NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent : @"result.png" ];
    NSLog ( @"%@" , savedImagePath);
    [imageViewData writeToFile :savedImagePath atomically : YES ];
    CGImageRelease (imageRefRect);
   
    return viewImage;

}

3. 写入相册

// 写入相册
- ( void )saveToLibratyWithImage:( UIImage *)image
{
    ALAssetsLibrary *library = [[ ALAssetsLibrary alloc ] init ];
    [library writeImageToSavedPhotosAlbum :[image CGImage ]
                              orientation :( ALAssetOrientation )[image imageOrientation ]
                          completionBlock :^( NSURL *assetURL, NSError *error){

                        

                          }];

}

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