保存照片到系统相册
保存照片到系统相册这个功能很多社交类的APP都有的,今天我们简单讲解一下,如何将图片保存到系统相册(Photo Album)。
1.创建UIImageView
创建UIImageView是为了将照片展示出来,我们是要把UIImage保存到系统相册(Photo Album):
#define SCREEN [UIScreen mainScreen].bounds.sizeself.image = [UIImage imageNamed:@"iOSDevTip"]; UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake((SCREEN.width - 300) / 2, 70, 300, 150)]; imageView.image = self.image; [self.view addSubview:imageView];
2.创建UIButton
创建UIButton并绑定actionClick:事件:
UIButton *button = [[UIButton alloc] init]; button.frame = CGRectMake( 100, 300, SCREEN.width - 200, 40); [button addTarget:self action:@selector(actionClick:) forControlEvents:UIControlEventTouchUpInside]; [button setTitleColor:[UIColor blueColor] forState:UIControlStateNormal]; [button setBackgroundColor:[UIColor orangeColor]]; [button setTitle:@"SavePhoto" forState:UIControlStateNormal]; [self.view addSubview:button];- (void)actionClick:(UIButton *)button {
}
3.保存照片到系统相册(Photo Album)
在actionClick:方法里调用:
UIImageWriteToSavedPhotosAlbum(self.image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
// 指定回调方法 - (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo { if(!error){ NSLog(@"save success"); }else{ NSLog(@"save failed"); } }
保存照片到自己创建的相簿
接下来,我们来详细讲解一下关于系统相册权限获取、保存照片、创建自己的相簿等等功能。
1.创建自己的相簿
这也是一种比较创建的作法,创建自己的相簿,然后把照片或者视频保存到自己的相簿中。相关代码如下:
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]; [library addAssetsGroupAlbumWithName:@"test" resultBlock:^(ALAssetsGroup *group) {//创建相簿成功
} failureBlock:^(NSError *error) { //失败 }];
这个方法也是将照片保存到系统相簿里面,不是保存到自己创建的相簿里面。代码如下:
ALAssetsLibrary *library = [[ALAssetsLibrary alloc]init]; [library writeImageToSavedPhotosAlbum:image.CGImage orientation:(ALAssetOrientation)image.imageOrientation completionBlock:^(NSURL *asSetUrl,NSError *error){ if (error) { //失败 }else{ UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"存储成功" message:nil delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil]; [alert show];} }];
(1)创建相簿失败
(2)保存照片失败
在上面两个方法创建自己的相簿和保存照片的失败结果里,我们可以弹出获取照片权限失败的提示。我们拿第一个创建相簿失败来举例:
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]; [library addAssetsGroupAlbumWithName:@"test" resultBlock:^(ALAssetsGroup *group) {//创建相簿成功
} failureBlock:^(NSError *error) { UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"存储失败" message:@"请打开 设置-隐私-照片 来进行设置" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil]; [alert show]; }];
4.保存照片到自己的相簿
下面这段代码是在大谷歌里面找到的,亲自测试过是可以用的,整理如下:
#pragma mark - 创建相册 - (void)createAlbum { ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init]; NSMutableArray *groups=[[NSMutableArray alloc]init]; ALAssetsLibraryGroupsEnumerationResultsBlock listGroupBlock = ^(ALAssetsGroup *group, BOOL *stop) { if (group) { [groups addObject:group]; }else { BOOL haveHDRGroup = NO;
for (ALAssetsGroup *gp in groups) { NSString *name =[gp valueForProperty:ALAssetsGroupPropertyName];
if ([name isEqualToString:@"iOSDevTip"]) { haveHDRGroup = YES; } }
if (!haveHDRGroup) { //do add a group named "XXXX" [assetsLibrary addAssetsGroupAlbumWithName:@"iOSDevTip" resultBlock:^(ALAssetsGroup *group) { [groups addObject:group];
} failureBlock:nil]; haveHDRGroup = YES; } }
}; //创建相簿 [assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAlbum usingBlock:listGroupBlock failureBlock:nil];
[self saveToAlbumWithMetadata:nil imageData:UIImagePNGRepresentation(self.image) customAlbumName:@"iOSDevTip" completionBlock:^ { //这里可以创建添加成功的方法
} failureBlock:^(NSError *error) { //处理添加失败的方法显示alert让它回到主线程执行,不然那个框框死活不肯弹出来 dispatch_async(dispatch_get_main_queue(), ^{
//添加失败一般是由用户不允许应用访问相册造成的,这边可以取出这种情况加以判断一下 if([error.localizedDescription rangeOfString:@"User denied access"].location != NSNotFound ||[error.localizedDescription rangeOfString:@"用户拒绝访问"].location!=NSNotFound){ UIAlertView *alert=[[UIAlertView alloc]initWithTitle:error.localizedDescription message:error.localizedFailureReason delegate:nil cancelButtonTitle:NSLocalizedString(@"ok", nil) otherButtonTitles: nil];
[alert show]; } }); }]; }
- (void)saveToAlbumWithMetadata:(NSDictionary *)metadata imageData:(NSData *)imageData customAlbumName:(NSString *)customAlbumName completionBlock:(void (^)(void))completionBlock failureBlock:(void (^)(NSError *error))failureBlock {
ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init]; __weak ALAssetsLibrary *weakSelf = assetsLibrary; void (^AddAsset)(ALAssetsLibrary *, NSURL *) = ^(ALAssetsLibrary *assetsLibrary, NSURL *assetURL) { [assetsLibrary assetForURL:assetURL resultBlock:^(ALAsset *asset) { [assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
if ([[group valueForProperty:ALAssetsGroupPropertyName] isEqualToString:customAlbumName]) { [group addAsset:asset]; if (completionBlock) { completionBlock(); } } } failureBlock:^(NSError *error) { if (failureBlock) { failureBlock(error); } }]; } failureBlock:^(NSError *error) { if (failureBlock) { failureBlock(error); } }]; }; [assetsLibrary writeImageDataToSavedPhotosAlbum:imageData metadata:metadata completionBlock:^(NSURL *assetURL, NSError *error) { if (customAlbumName) { [assetsLibrary addAssetsGroupAlbumWithName:customAlbumName resultBlock:^(ALAssetsGroup *group) { if (group) { [weakSelf assetForURL:assetURL resultBlock:^(ALAsset *asset) { [group addAsset:asset]; if (completionBlock) { completionBlock(); } } failureBlock:^(NSError *error) { if (failureBlock) { failureBlock(error); } }]; } else { AddAsset(weakSelf, assetURL); } } failureBlock:^(NSError *error) { AddAsset(weakSelf, assetURL); }]; } else { if (completionBlock) { completionBlock(); } } }]; }
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