线程

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

062. ALAssetsLibraryGroupsEnumerationResultsBlock listGroupBlock = ^(ALAssetsGroup *group, BOOL *stop) {

063. if (group != nil) {

064. [weakSelf.groupArrays addObject:group];

065. } else {

066. [weakSelf.groupArrays enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {

067. [obj enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {

068. if ([result thumbnail] != nil) {

069. // 照片

070. if ([[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypePhoto]){

071.  

072. NSDate *date= [result valueForProperty:ALAssetPropertyDate];

073. UIImage *image = [UIImage imageWithCGImage:[result thumbnail]];

074. NSString *fileName = [[result defaultRepresentation] filename];

075. NSURL *url = [[result defaultRepresentation] url];

076. int64_t fileSize = [[result defaultRepresentation] size];

077.  

078. NSLog(@"date = %@",date);

079. NSLog(@"fileName = %@",fileName);

080. NSLog(@"url = %@",url);

081. NSLog(@"fileSize = %lld",fileSize);

082.  

083. // UI的更新记得放在主线程,要不然等子线程排队过来都不知道什么年代了,会很慢的

084. dispatch_async(dispatch_get_main_queue(), ^{

085. self.litimgView.image = image;

086. });

087. }