IOS 判断相册是否允许访问

1. -(void)savedLibrayImage:(UIImage *)image  
2. {  
3.     ALAssetsLibrary *library = [[ALAssetsLibrary alloc]init];  
4.     [library writeImageToSavedPhotosAlbum:image.CGImage orientation:image.imageOrientation completionBlock:^(NSURL *asSetUrl,NSError *error){  
5.         if (error) {  
6.             UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"存储失败"  
7.                                                            message:@"请打开 设置-隐私-照片 来进行设置"  
8.                                                           delegate:nil  
9.                                                  cancelButtonTitle:@"确定"  
10.                                                  otherButtonTitles:nil, nil];  
11.             [alert show];  
12.             [alert release];  
13.         }else{  
14.             UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"存储成功"  
15.                                                            message:nil  
16.                                                           delegate:nil  
17.                                                  cancelButtonTitle:@"确定"  
18.                                                  otherButtonTitles:nil, nil];  
19.             [alert show];  
20.             [alert release];  
21.         }  
22.           
23.     }];  
24. }