在SKView上加载Xib视图后，ModalViewController上的滞后/延迟关闭 [英] Lag / Delay on ModalViewController dismiss after loading an xib view over SKView

问题描述

想象这种情况(下面的一些代码):

Imagine this scenario (some code below):

1. 我在视图控制器上有一个SKView.
2. 我在skview上加载了一个xib视图(外部.xib文件)(xib视图就像一个小的菜单视图，不能完全覆盖整个屏幕).
3. 然后，我从SKView的控制器中以模态显示视图控制器
4. 当我关闭此模态视图控制器时，每秒的关闭都会有延迟(因此，我以模态显示它，关闭，很好，然后我重复，有延迟，然后重复，可以正常工作，然后再做一次，有延迟...等等)
5. 如果我不使用SKView(如果我只是使用UIView)，则不会发生这种延迟.仅当我使用SKView时才会发生.

可能是什么原因造成的?这是产生此问题的简化代码:

What may be causing that? Here is simplified code that produces this problem:

@implementation NOZTestController
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    // button that loads xib view onto the current skview 
    UIButton *showxib = [[UIButton alloc] initWithFrame:CGRectMake(20, 80, 280, 30)];
    [showxib setTitle:@"Add xib view here" forState:UIControlStateNormal];
    [showxib addTarget:self action:@selector(showxibTapped) forControlEvents:UIControlEventTouchUpInside];

    // button that loads a view controller programmatically 
    UIButton *showmodal = [[UIButton alloc] initWithFrame:CGRectMake(20, 120, 280, 30)];
    [showmodal setTitle:@"Show modal" forState:UIControlStateNormal];
    [showmodal addTarget:self action:@selector(showmodalTapped) forControlEvents:UIControlEventTouchUpInside];


    self.view = [[SKView alloc] initWithFrame:self.view.frame];
    SKView *v = (SKView *)self.view;

    //UIView *v = self.view;

    [v addSubview:showxib];
    [v addSubview:showmodal];

}

- (void)showxibTapped
{
    // displays the xib view 
    [NOZPlayAgainView presentOnView:self.view inRect:CGRectMake(20, 200, 280, 160) withDelegate:self];
}

- (void)showmodalTapped
{
    // displays the modal window 
    UIViewController *vc = [[UIViewController alloc] init];

    UIButton *dismiss = [[UIButton alloc] initWithFrame:CGRectMake(40, 40, 240, 40)];
    [dismiss setTitle:@"Dismiss" forState:UIControlStateNormal];    
    [dismiss addTarget:self action:@selector(dismissModal) forControlEvents:UIControlEventTouchUpInside];
    [vc.view addSubview:dismiss];


    [self presentViewController:vc animated:YES completion:nil];
}

- (void)dismissModal
{
    [self.presentedViewController dismissViewControllerAnimated:YES completion:nil];
}

@end

推荐答案

它是由xib视图上的自动布局约束引起的.为了得出这个结论，我创建了一个带有子视图的简单视图，并将其添加到SKView中.我上面报告的问题仅在使用自动布局约束放置子视图时发生.我不知道为什么会这样，但这就是原因.

It is caused by autolayout constraints on the xib view. To arrive to that conclusion, I created a simple view with a subview and added it to SKView. The problem I reported above happened only when I used auto layout constraints to place the subview. I don't know why this is happening but that is the reason for it.

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