iOS开发之保存图片到手机相册

1. - (void)viewDidLoad  
2. {  
3.     [super viewDidLoad];  
4.     // Do any additional setup after loading the view.  
5.       
6.     self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(60, 100, 200, 300)];  
7.     _imageView.image = [UIImage imageNamed:@"hmt.jpg"];  
8.     _imageView.userInteractionEnabled = YES;  
9.     [self.view addSubview:_imageView];  
10.       
11.     UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] init];  
12.     tapGesture.numberOfTapsRequired = 1;  
13.     tapGesture.numberOfTouchesRequired = 1;  
14.     [tapGesture addTarget:self action:@selector(tapSaveImageToIphone)];  
15.     [self.imageView addGestureRecognizer:tapGesture];  
16.   
17. }  
18.   
19. - (void)tapSaveImageToIphone{  
20.   
21.     /** 
22.      *  将图片保存到iPhone本地相册 
23.      *  UIImage *image            图片对象 
24.      *  id completionTarget       响应方法对象 
25.      *  SEL completionSelector    方法 
26.      *  void *contextInfo 
27.      */  
28.     UIImageWriteToSavedPhotosAlbum(self.imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);  
29.       
30. }  
31.   
32. - (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(voidvoid *)contextInfo{  
33.   
34.     if (error == nil) {  
35.       
36.         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"已存入手机相册" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil nil];  
37.         [alert show];  
38.           
39.     }else{  
40.       
41.         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"保存失败" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil nil];  
42.         [alert show];  
43.     }  
44.       
45. }