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@interface ViewController ()
void UIImageWriteToSavedPhotosAlbum (
                               
                                     UIImage  * image,
                                  
                                     id      completionTarget,
                                  
                                     SEL      completionSelector,
                                  
                                     void    *contextInfo
                                 
                                     );
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
   
   
    UIImage *imagName = [UIImage imageNamed:@"submit"];
   
    [self saveImageToPhotos:imagName];
}


-(void)saveImageToPhotos:(UIImage*)savedImage

{
  
    UIImageWriteToSavedPhotosAlbum(savedImage, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
 
}

// 指定回调方法

- (void)image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo

{
 
    NSString *msg = nil ;
 
    if(error != NULL){
   
        msg = @"保存图片失败" ;
      
    }else{
     
        msg = @"保存图片成功" ;
     
    }
   
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"保存图片结果提示"
                      
                                                    message:msg
                      
                                                   delegate:self
                         
                                          cancelButtonTitle:@"确定"
                     
                                          otherButtonTitles:nil];
  
    [alert show];
   

}

 

说明

UIImageWriteToSavedPhotosAlbum是UIKit框架中的一个函数。 这里说一下后面三个参数的含义： void UIImageWriteToSavedPhotosAlbum (    UIImage  *image,    id       completionTarget,    SEL      completionSelector,    void     *contextInfo );   id是target对象，sel是selector，即target对象上的方法名，contextInfo是任意指针，会传递到selector定义的方法上。一般是当完成后调用方法时使用，或者在完成时出错的处理。