UIStoryBoardSegue转换-状态栏问题

Question

我正在尝试使用UIStoryboardSegue子类创建到新视图控制器的自定义转换，但我遇到了一些问题。我有一个后退按钮，与AutoLayout设置为5个像素从顶部布局指南(基本上25个像素，从顶部的视图)。但是，当我正在传输视图时，没有考虑到状态栏的存在，并使按钮距视图顶部5像素，而不是距视图顶部25像素(状态栏。高度== 20 of )。因此，当转换结束时，当我调用[self sourceViewController presentModalViewController:self destinationViewController动画:NO]时，突然出现反弹；因为这样按钮实际上就被正确地分层了。有没有人知道我如何告诉我的观点，它应该布局假设顶部布局指南开始于20 of而不是0？

编辑：问题似乎与topLayoutGuide直接相关。在检查topLayoutGuide的值时，当我在转换中添加视图时，它是0，但是当我在目标视图控制器的viewDidAppear中检查它时，它是20，这是应该的。

- (void)perform {
UIWindow *window = [[[UIApplication sharedApplication] windows] objectAtIndex:0];
UIViewController *sourceViewController = (UIViewController*)self.sourceViewController;
UIViewController *destinationViewController = (UIViewController*)self.destinationViewController;

[destinationViewController.view setCenter:CGPointMake(window.frame.size.width * 1.5, sourceViewController.view.center.y)];
[[sourceViewController.view superview] addSubview:destinationViewController.view];
[destinationViewController.view setBackgroundColor:[UIColor redColor]];

POPSpringAnimation *positionAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPLayerPositionX];
positionAnimation.toValue = @(window.center.x);
positionAnimation.springBounciness = 10;


POPSpringAnimation *fromPositionAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPLayerPositionX];
double offScreenX = -sourceViewController.view.frame.size.width;
fromPositionAnimation.toValue = @(offScreenX);
fromPositionAnimation.springBounciness = 10;
[fromPositionAnimation setCompletionBlock:^(POPAnimation *anim, BOOL finished) {
}];

POPSpringAnimation *scaleAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPLayerScaleXY];
scaleAnimation.springBounciness = 20;
scaleAnimation.fromValue = [NSValue valueWithCGPoint:CGPointMake(1.0, 1.1)];
[scaleAnimation setCompletionBlock:^(POPAnimation *anim, BOOL finished) {
    [[self sourceViewController] presentModalViewController:[self destinationViewController] animated:NO];
}];

[sourceViewController.view.layer pop_addAnimation:fromPositionAnimation forKey:@"positionAnimation"];
[destinationViewController.view.layer pop_addAnimation:positionAnimation forKey:@"positionAnimation"];
[destinationViewController.view.layer pop_addAnimation:scaleAnimation forKey:@"scaleAnimation"];

}

​

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Answer 1

我建议叫setNeedLayout on viewWillAppear。它应该调整视图子视图的布局。