获取设备中照片库代码,ObjC代码库,德仔网

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【ObjC】获取设备中照片库

作者:宝清 / 发布于2014/11/17/ 367

获取设备中照片库，可以分别得到最后一张图片或者最后一个视频的封面，用户相机的按钮显示

利用block回调，使用非常方便
__weak typeof(self) weakSelf = self;
[self updateLibraryButtonWithCameraMode:XHCameraModeVideo didFinishcompledBlock:^(UIImage *thumbnail) {
[weakSelf.videoLibraryButton setBackgroundImage:thumbnail forState:UIControlStateNormal];
}];


	#pragma mark - Library Thumbnail Getter
	
	- (void)updateLibraryButtonWithCameraMode:(XHCameraMode)cameraMode didFinishcompledBlock:(void (^)(UIImage *thumbnail))compled {
	 __block NSString *assetPropertyType = nil;
	 __block NSMutableArray *assets = [[NSMutableArray alloc] init];
	 if (cameraMode == XHCameraModePhoto) {
	 assetPropertyType = [ALAssetTypePhoto copy];
	 } else if (cameraMode == XHCameraModeVideo) {
	 assetPropertyType = [ALAssetTypeVideo copy];
	 }
	
	 void (^assetGroupEnumerator)(ALAssetsGroup *, BOOL *) = ^(ALAssetsGroup *group, BOOL *stop)
	 {
	 if (group == nil)
	 {
	 return;
	 }
	 *stop = YES;
	
	 __block int num = 0;
	 [group enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop)
	 {
	 if(result == nil)
	 {
	 return;
	 }
	 __block ALAsset *assetResult = result;
	 num++;
	 NSInteger numberOf = [group numberOfAssets];
	
	 NSString *al_assetPropertyType = [assetResult valueForProperty:ALAssetPropertyType];
	 if ([al_assetPropertyType isEqualToString:assetPropertyType]) {
	 [assets addObject:assetResult];
	 }
	
	 if (num == numberOf) {
	 UIImage *img = [UIImage imageWithCGImage:[[assets lastObject] thumbnail]];
	 dispatch_async(dispatch_get_main_queue(), ^{
	 if (compled) {
	 compled(img);
	 }
	 });
	 }
	 }];
	 };
	
	 // Group Enumerator Failure Block
	 void (^assetGroupEnumberatorFailure)(NSError *) = ^(NSError *error) {
	 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
	 UIImage *img = [UIImage imageNamed:@"photo_Library.png"];
	 dispatch_async(dispatch_get_main_queue(), ^{
	 if (compled) {
	 compled(img);
	 }
	 });
	 });
	 };
	 // Enumerate Albums
	 ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
	 [library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos
	 usingBlock:assetGroupEnumerator
	 failureBlock:assetGroupEnumberatorFailure];
	}

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