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获取某一个相册中所有照片和照片的缩略图
- (void)loadAssets {
// Initialise
_assets = [NSMutableArray new];
_assetLibrary = [[ALAssetsLibrary alloc] init];
// Run in the background as it takes a while to get all assets from the library
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSMutableArray *assetGroups = [[NSMutableArray alloc] init];
NSMutableArray *assetURLDictionaries = [[NSMutableArray alloc] init];
// Process assets
void (^assetEnumerator)(ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *result, NSUInteger index, BOOL *stop) {
if (result != nil) {
if ([[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypePhoto]) {
[assetURLDictionaries addObject:[result valueForProperty:ALAssetPropertyURLs]];
NSURL *url = result.defaultRepresentation.url;
[_assetLibrary assetForURL:url
resultBlock:^(ALAsset *asset) {
if (asset) {
@synchronized(_assets) {
[_assets addObject:asset];
if (_assets.count == 1) {
// Added first asset so reload data
// [self.tableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:NO];
}
}
}
}
failureBlock:^(NSError *error){
NSLog(@"operation was not successfull!");
}];
}
}
};
ALAssetsLibraryAccessFailureBlock failureblock =
^(NSError *myerror)
{
NSLog(@"相册访问失败 =%@", [myerror localizedDescription]);
if ([myerror.localizedDescription rangeOfString:@"Global denied access"].location!=NSNotFound) {
NSLog(@"无法访问相册.请在‘设置->定位服务‘设置为打开状态.");
}else{
NSLog(@"相册访问失败.");
}
};
// Process groups
void (^ assetGroupEnumerator) (ALAssetsGroup *, BOOL *) = ^(ALAssetsGroup *group, BOOL *stop) {
if (group != nil) {
NSString *g=[NSString stringWithFormat:@"%@",group];//获取相簿的组
NSString *g1=[g substringFromIndex:16] ;
NSArray *arr=[[NSArray alloc] init];
arr=[g1 componentsSeparatedByString:@","];
NSString *g2=[[arr objectAtIndex:0] substringFromIndex:5];
if ([g2 isEqualToString:@"Camera Roll"]) {
g2=@"相机胶卷";
}
if ([g2 isEqualToString:@"MyPhoto"]) {
*stop = NO;
[group enumerateAssetsWithOptions:NSEnumerationReverse usingBlock:assetEnumerator];
[assetGroups addObject:group];
}
}else{
NSLog(@"********else!");
NSMutableArray *photos = [[NSMutableArray alloc] init];
NSMutableArray *thumbs = [[NSMutableArray alloc] init];
@synchronized(_assets) {
NSMutableArray *copy = [_assets copy];
for (ALAsset *asset in copy) {
[photos addObject:[MWPhoto photoWithURL:asset.defaultRepresentation.url]];
[thumbs addObject:[MWPhoto photoWithImage:[UIImage imageWithCGImage:asset.thumbnail]]];
}
}
self.photos = photos;//照片
self.thumbs = thumbs;//缩略图
}
};
// Process!
[self.assetLibrary enumerateGroupsWithTypes:ALAssetsGroupAll
usingBlock:assetGroupEnumerator
failureBlock:failureblock];
});
}
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