Question

我在presentModal上使用：

调用viewDidAppear方法

[[NSNotificationCenter defaultCenter] addObserver:self         
                                             selector:@selector(presentModal)         
                                                 name:@"xxxxxxx"         
                                               object:nil];

-(void)presentModal 
{
    PickerModalViewController *pickerModalViewController = [Appdelegate.window.rootViewController.storyboard instantiateViewControllerWithIdentifier:@"PickerModalViewController"];

    pickerType = 2;
    pickerModalViewController.choices = self.localArray;
    pickerModalViewController.buttonTag = pickerType;

    pickerModalViewController.delegate = self;
    self.pickerPresenter = self;

    if (self.pickerPresenter) {
        [self.pickerPresenter presentViewController:pickerModalViewController animated:YES completion:nil];
    }
}

当呈现选择器时，它在设备和模拟器中给我一个警告

警告：Attempt to present PickerModalViewController: 0x10ec7280 on UINavigationController: 0x90ad610 while a presentation is in progress!

Answer 1

警告告诉你，出了什么问题。要避免此警告，您可以使用UINavigationController的delegate属性并实现

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated

警告：在调用通知时尝试显示模态

1 个答案: