Question

我有以下ViewControllers在完成某些事情时显示下一个ViewController：

Nr1：我的GameViewController检查游戏是否已经完成并调用CheckGameFinished：

-(void) checkGameFinished {
if ([self.gameModel isGameOver]) {

    double delayTimeInSeconds = 3.5;
    dispatch_time_t popTimeDelay = dispatch_time(DISPATCH_TIME_NOW, delayTimeInSeconds * NSEC_PER_SEC);
    dispatch_after(popTimeDelay, dispatch_get_main_queue(), ^(void){

    [progressBarTimer invalidate];

    level2ViewController *govc = [self.storyboard instantiateViewControllerWithIdentifier:@"level2ViewController"];

    [self.finishAudio play];

    [self presentViewController:govc animated:NO completion:^(){
        [self.gameModel clearGameData];

    }];
          });
}
}

然后出现level2ViewController：

- (void)viewDidLoad {
[super viewDidLoad];

double delayTimeInSeconds = 2;
dispatch_time_t popTimeDelay = dispatch_time(DISPATCH_TIME_NOW, delayTimeInSeconds * NSEC_PER_SEC);
dispatch_after(popTimeDelay, dispatch_get_main_queue(), ^(void){


    GameViewController *gvc = [self.storyboard instantiateViewControllerWithIdentifier:@"gameViewController"];

    [self presentViewController:gvc animated:NO completion:nil];


});

}

并调用下一个ViewController，依此类推。

现在我加班以下警告：

警告：尝试在level2ViewController上显示GameViewController 其视图不在窗口层次结构中！

Answer 1

不要来自viewDidLoad的视图控制器，而是来自viewDidAppear:。同样使用dispatch_after就好了（假设您正在使用它来确保视图在屏幕上而不是用于游戏目的）是一种非常糟糕的做法。
当正在加载的视图控制器已经完成时（在调用viewDidAppear:时发生），您可以呈现不同的视图控制器：

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    GameViewController *gvc = [self.storyboard instantiateViewControllerWithIdentifier:@"gameViewController"];
    [self presentViewController:gvc animated:NO completion:nil];
}

Answer 2

当Builder Pattern类型为segue时，我收到此消息，更改为modal为我修复了

尝试显示View Controller警告

2 个答案: