ios - 互联网连接不良时viewWillAppear和viewDidAppear之间的延迟

Question

我的应用程序有一个问题:当互联网连接不良时，viewWillAppear的结束与viewDidAppear的开始之间会有一个延迟(大约4s)。但是当互联网正常时，问题就不会发生!

-(void)viewDidAppear:(BOOL)animated{
    [super viewDidAppear:animated];
    [_btnMenu setBadgeTextColor:[UIColor whiteColor]];
    [self updateNotification];
    [_btnMenu setBadgeEdgeInsets:UIEdgeInsetsMake(15, 0, 0, 8)];
    [_btnMenu setHideWhenZero:YES];
    [self setNeedsStatusBarAppearanceUpdate];
}

-(void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    [WSProgressHUD dismiss];        
}

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    [super setUpLocalizationString];
    willRoute = NO;


}

Answer 1

我敢肯定，您正在阻止主程序执行的主线程上执行了某些操作(例如Internet检查或任何其他网络操作)。做互联网检查后台线程。

Objective-C

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    // DO the internet checking or any other network operations here
});

Swift 3.0

DispatchQueue.global(qos: .background).async {
    print("This is run on the background queue")
    // DO the internet checking or any other network operations here
}