Ios 我无法从应用程序委派显示viewcontroller

代码：

- (IBAction)twilioCall:(UIButton *)sender {
  AppDelegate *appdel=(AppDelegate *)[[UIApplication sharedApplication]delegate];
  [appdel goNativeStoryboardToTwilio];
}

Warning: Attempt to present <DummyViewController: 0x1565f9910> on <UIViewController: 0x157831460> whose view is not in the window hierarchy!

Appdelegate.h

- (void)goNativeStoryboardToTwilio;

Appdelegate.m

-(void)goNativeStoryboardToTwilio {

  DummyViewController *vc = [[UIStoryboard storyboardWithName:@"NativeStoryboard" bundle:nil] instantiateViewControllerWithIdentifier:@"dummy"];
  [self.window.rootViewController presentViewController:vc animated:true completion:nil];
}

-(void)goNativeStoryboardToTwilio {
  double delayInSeconds = 10.0;
  dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
  dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
    DummyViewController *vc = [[UIStoryboard storyboardWithName:@"NativeStoryboard" bundle:nil] instantiateViewControllerWithIdentifier:@"dummy"];
    [self.window.rootViewController presentViewController:vc animated:true completion:nil];
  });
}

RoomInputToolbarView.m:

- (IBAction)twilioCall:(UIButton *)sender {
  AppDelegate *appdel=(AppDelegate *)[[UIApplication sharedApplication]delegate];
  [appdel goNativeStoryboardToTwilio];
}

Warning: Attempt to present <DummyViewController: 0x1565f9910> on <UIViewController: 0x157831460> whose view is not in the window hierarchy!

RoomInputToolbarView.xib:

- (IBAction)twilioCall:(UIButton *)sender {
  AppDelegate *appdel=(AppDelegate *)[[UIApplication sharedApplication]delegate];
  [appdel goNativeStoryboardToTwilio];
}

Warning: Attempt to present <DummyViewController: 0x1565f9910> on <UIViewController: 0x157831460> whose view is not in the window hierarchy!

结果：

- (IBAction)twilioCall:(UIButton *)sender {
  AppDelegate *appdel=(AppDelegate *)[[UIApplication sharedApplication]delegate];
  [appdel goNativeStoryboardToTwilio];
}

Warning: Attempt to present <DummyViewController: 0x1565f9910> on <UIViewController: 0x157831460> whose view is not in the window hierarchy!

---

即使现在我也得到了同样的结果。但是，在该视图控制器中打印的所有日志都将被打印，只有屏幕没有改变。有人能给我一个解决方案吗？

问题是，你在VC完全进入窗口之前就提前调用present，所以你需要延迟，或者在ViewController的覆盖方法中延迟它

为什么你要在应用程序中呈现controller delegate？我想你错过了这一行。[WindowMakeKeyandVisible]；请在上面的方法中也添加此项，然后检查。显示您在哪里调用此方法

GonativeStoryBoardTotwillio

Hi@RahulGUsai，我正在尝试从对象文件调用视图控制器，因此我使用app delegate来表示该虚拟视图控制器。Hi@zero，正如您所要求的，我已编辑了我的上述问题。请检查一下。我可以知道你说的是哪个视图控制器吗。是关于appdelegate还是我创建的虚拟视图控制器？