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iOS - 在解除其他视图控制器后立即显示View控制器

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我有三个View Controller VC1，VC2和VC3 .

VC2是第三方库，它在VC1上呈现 .

然后VC2解散自己并向VC1发送回调，VC1尝试向自己呈现VC3但失败了 .

解雇VC2后有没有办法立即呈现VC3？

-(void)onDismisLoginVC{

    MessageVC *messageVC = [[MessageVC alloc] initWithNibName:@"MessageVC" bundle:nil];
    [self.navigationController presentViewController:messageVC animated:YES completion:NULL];

}

不幸的是我不能在VC2中使用 ^completion 块解除显示的viewcontroller，因为我只是接收到这个方法的回调而无法编辑VC2的代码 .

ios objective-c presentviewcontroller

3 回答

  • 6

    我知道我们总是将 nil 用于完成块...但它确实有一些用处 . 我向你保证 .

    [self dismissViewControllerAnimated:YES completion:^{
    //code to be executed with the dismissal is completed
    // for example, presenting a vc or performing a segue
    }];
    回复于
  • 5

    这是我用来解雇Facebook登录视图控制器的那个 .

    UIViewController *theTrick = self.presentingViewController;
UIViewController *toPresent = [self.storyboard instantiateViewControllerWithIdentifier:@"toPresentViewController"];

[self dismissViewControllerAnimated:YES completion:^{
    [theTrick presentViewController:toPresent animated:YES completion:nil];
}];
    回复于
  • -2

    谢谢你的帮助 . 在呈现VC3之前添加一点延迟解决了这个问题 .

    -(void)onDismisLoginVC{

[self performSelector:@selector(presentMessageVC) withObject:self afterDelay:1];

}

-(void)presentMessageVC
{

MessageVC *messageVC = [[MessageVC alloc] initWithNibName:@"MessageVC" bundle:nil];
[self.navigationController presentViewController:messageVC animated:YES completion:NULL];

}
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