AssetsLibrary.framework

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

[library enumerateGroupsWithTypes:ALAssetsGroupAll

usingBlock:^(ALAssetsGroup *group, BOOL *stop)

{

NSLog(@"%@", group);

[group setAssetsFilter:[ALAssetsFilter allAssets]];

NSLog(@"名称：%@", [group valueForProperty:ALAssetsGroupPropertyName]);

NSNumber* groupType = [group valueForProperty:ALAssetsGroupPropertyType];

switch ([groupType unsignedIntegerValue]) {

case ALAssetsGroupAlbum:

{

NSLog(@"来自我的电脑或者是在设备上创建");

NSString* persistentID = [group valueForProperty:ALAssetsGroupPropertyPersistentID];

if ([[persistentID substringWithRange:NSRangeFromString(@"0,8")] isEqualToString:@"00000000"])

{

NSLog(@"来自我的电脑");

}

break;

}

case ALAssetsGroupSavedPhotos:

NSLog(@"相机胶卷");

break;

case ALAssetsGroupPhotoStream:

NSLog(@"我的照片流");

break;

default:

break;

}

failureBlock: ^(NSError *error)

{

NSLog(@"No groups");

}];

//获取相册所有图片并遍历

self.assetsLibrary = [[ALAssetsLibraryalloc] init];

dispatch_queue_t dispatchQueue =dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0);

dispatch_async(dispatchQueue, ^(void) {

// 遍历所有相册

[self.assetsLibraryenumerateGroupsWithTypes:ALAssetsGroupAll

usingBlock:^(ALAssetsGroup *group,BOOL *stop) {

// 遍历每个相册中的项ALAsset

[group enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index,BOOL *stop) {

__block BOOL foundThePhoto = NO;

if (foundThePhoto){

*stop = YES;

}

// ALAsset的类型

NSString *assetType = [result valueForProperty:ALAssetPropertyType];

if ([assetType isEqualToString:ALAssetTypePhoto]){

foundThePhoto =YES;

*stop = YES;

ALAssetRepresentation *assetRepresentation =[result defaultRepresentation];

CGFloat imageScale = [assetRepresentation scale];

UIImageOrientation imageOrientation = (UIImageOrientation)[assetRepresentationorientation];

dispatch_async(dispatch_get_main_queue(), ^(void) {

CGImageRef imageReference = [assetRepresentation fullResolutionImage];

// 对找到的图片进行操作

UIImage *image =[[UIImage alloc]initWithCGImage:imageReference scale:imageScaleorientation:imageOrientation];

if (image != nil){

//获取到第一张图片

} else {

NSLog(@"Failed to create the image.");

} });

}

}];

}

failureBlock:^(NSError *error) {

NSLog(@"Failed to enumerate the asset groups.");

}];

});

//保存图片到相册的两种方法

- (void)saveImageToPhotos:(UIImage*)savedImage

{

//第一种保存图片

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

// 第二种保存图片 ALAssetsLibrary

// NSString *imageURL = nil;

// ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];

// ALAssetsLibraryWriteImageCompletionBlock completeBlock = ^(NSURL *assetURL, NSError *error){

// if (!error) {

//#pragma mark get image url from camera capture.

// imageURL = [NSString stringWithFormat:@"%@",assetURL];

// }

// };

// if(savedImage){

// [assetsLibrary writeImageToSavedPhotosAlbum:[savedImage CGImage]

// orientation:(ALAssetOrientation)[savedImage imageOrientation]

// completionBlock:completeBlock];

// }

}

- (void)image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo

{

if(error){

//保存失败

}else{

//保存成功

}

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