IOS 判断相册是否允许访问

1. ALAssetsLibrary *library = [[ALAssetsLibrary alloc]init];  

2.     [library writeImageToSavedPhotosAlbum:p_w_picpath.CGImage orientation:p_w_picpath.p_w_picpathOrientation completionBlock:^(NSURL *asSetUrl,NSError *error){  

3.         if (error) {  

4.             UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"保存图片失败"  

5.                                                            message:@"请打开 设置-隐私-照片 来进行设置"  

6.                                                           delegate:nil  

7.                                                  cancelButtonTitle:@"确定"  

8.                                                  otherButtonTitles:nil, nil];  

9.             [alert show];  

10.             [alert release];  

11.         }else{  

12.             UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"保存图片成功"  

13.                                                            message:nil  

14.                                                           delegate:nil  

15.                                                  cancelButtonTitle:@"确定"  

16.                                                  otherButtonTitles:nil, nil];  

17.             [alert show];  

18.             [alert release];  

19.         }  

20.           

21.     }];