iOS 保存图片到相册中

1，保存图片到点击事件、

- (void) saveImageClick {
    PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
    if (status == PHAuthorizationStatusDenied) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"请到【设置-隐私-照片】打开访问开关" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];
        [alert show];
    } else if (status == PHAuthorizationStatusRestricted) {
        NSLog(@"无法访问相册");
    } else {
        [MBProgressHUD showProgressToView:nil Text:@"保存中..."];
        UIImage *saveImage = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://img.pconline.com.cn/images/upload/upc/tx/wallpaper/1209/07/c0/13693224_1346985492085.jpg"]]];
        [self saveImageToPhotos:saveImage];
    }
}

2，保存图片到方法、

- (void)saveImageToPhotos:(UIImage*)savedImage {
    UIImageWriteToSavedPhotosAlbum(savedImage, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
}

3，保存图片到回调提示、

- (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];
}