iOS - 在解除其他视图控制器后立即显示View控制器

Question

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];

}

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

Answer 1

我知道我们总是把它nil用于完成块......但实际上确实有一些用处.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
    }];

Answer 2

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];
}];