IOS UIImagePickerController 保存图片到 相册

// 异步下载图片

dispatch_queue_t queue =dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0);

dispatch_group_t group =dispatch_group_create();

dispatch_group_async(group, queue, ^{

NSData *data = [NSDatadataWithContentsOfURL:[NSURLURLWithString:imageUrl]];

UIImage *image = [UIImageimageWithData:data];

//  保存图片到相册

[PDPhotoGraphToolsaveImageToPhotos:image];

});

@interface PDPhotoGraphTool: NSObject

+ (void)saveImageToPhotos:(UIImage *)savedImage;

+ (void)image: (UIImage *) image didFinishSavingWithError: (NSError *) errorcontextInfo: (void *) contextInfo;

@end

@implementationPDPhotoGraphTool

+(void)saveImageToPhotos:(UIImage *)savedImage

{

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

}

+(void)image:(UIImage *)image didFinishSavingWithError:(NSError *)errorcontextInfo:(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 = [[UIAlertViewalloc] initWithTitle:@"保存图片结果提示"

message:msg

delegate:self

cancelButtonTitle:@"确定"

otherButtonTitles:nil];

[alert show];

}

@end