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我遍歷iOS設備上的相冊列表。在遍歷這個組後,我想簡單地打印出找到的專輯的數量。找出我的異步調用完成的時間
在我的代碼中,只有在所有相冊加載完成後才執行NSLog
語句,我必須更改哪些內容。
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
NSMutableArray *tempArray = [[NSMutableArray alloc] init];
void (^groupBlock)(ALAssetsGroup *, BOOL *) = ^(ALAssetsGroup *group, BOOL *stop){
if (group == nil){return;}
[tempArray addObject:group];
};
void (^failureBlock)(NSError *) = ^(NSError *error) {
NSLog(@"A problem occured %@", [error description]);
};
[library enumerateGroupsWithTypes:ALAssetsGroupAll
usingBlock:groupBlock
failureBlock:failureBlock];
NSLog(@"%i albums were loaded", tempArray.count);