// 設定逾時時間為秒
[manager.requestSerializer willChangeValueForKey:@"timeoutInterval"];
manager.requestSerializer.timeoutInterval = f;
[manager.requestSerializer didChangeValueForKey:@"timeoutInterval"];
// 設定逾時時間為秒
[manager.requestSerializer willChangeValueForKey:@"timeoutInterval"];
manager.requestSerializer.timeoutInterval = f;
[manager.requestSerializer didChangeValueForKey:@"timeoutInterval"];