相关疑难解决方法(0)

精简版:

当与自定义转换和UINavigationControlleriOS7 结合使用时,我遇到了自动布局顶部布局指南的问题.具体而言,顶级布局指南和文本视图之间的约束不受尊重.有没有人遇到过这个问题？

长版:

我有一个场景明确定义了约束(即顶部,底部,左侧和右侧),呈现如下视图:

但是当我在导航控制器上使用自定义转换时,顶部布局指南的顶部约束似乎关闭,它呈现如下,好像顶部布局指南位于屏幕顶部,而不是底部导航控制器:

使用自定义转换时,导航控制器的"顶部布局指南"似乎变得混乱.其余约束正确应用.如果我旋转设备并再次旋转它,一切都会突然正确呈现,所以看起来并不是没有正确定义约束.同样,当我关闭自定义转换时,视图会正确呈现.

话虽如此,当我运行时_autolayoutTrace报告UILayoutGuide对象受到影响AMBIGUOUS LAYOUT:

(lldb) po [[UIWindow keyWindow] _autolayoutTrace]

但是每当我看到它们时,这些布局指南总是被报告为含糊不清,即使我已经确保没有遗漏约束(我已经习惯性地选择视图控制器并选择"为视图控制器添加缺少的约束"或选择全部控制和为他们做同样的事情).

在如何我正是这样做的过渡方面,我指定符合对象UIViewControllerAnimatedTransitioning的animationControllerForOperation方法:

- (id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
                                  animationControllerForOperation:(UINavigationControllerOperation)operation
                                               fromViewController:(UIViewController*)fromVC
                                                 toViewController:(UIViewController*)toVC
{
    if (operation == UINavigationControllerOperationPush)
        return [[PushAnimator alloc] init];

    return nil;
}

和

@implementation PushAnimator

- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext
{
    return 0.5;
}

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
    UIViewController* toViewController   = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    UIViewController* fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];

    [[transitionContext containerView] addSubview:toViewController.view];
    CGFloat width = fromViewController.view.frame.size.width;

    toViewController.view.transform = CGAffineTransformMakeTranslation(width, 0); …

我在我的App中实现了一个自定义的UIViewController Transition,它取代了推送动画中内置的导航控制器.

到目前为止一切都有效,除了新推出的视图控制器中的toplayoutguide为0,尽管新视图控制器从旧视图控制器继承了导航栏.它应该是64.0(状态栏高度+导航栏高度),现在它是0.0.因此,附加到故​​事板中顶部布局指南的所有对象现在显示为64点太高(在半透明条下方).

当我禁用自定义视图转换时,顶部布局指南将具有预期值.我试图"遍布整个地方"调用layoutSubviews和updateConstraints.在视图控制器以及导航控制器中.

据我所知,navigationcontroller(parentviewcontroller)应更新新视图控制器的toplayoutguide,但显然我在自定义转换代码中遗漏了一些内容,这会触发更新为toplayoutguide的正确值.

这是我的自定义转换代码,它是一个设置为navigationcontroller委托的对象:

- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext
{
    return 0.7;
}

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
    UIView *animationContainerView = [transitionContext containerView];
    UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    UIView *toView = [toVC view];
    UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIView *fromView = [fromVC view];

    CGRect endFrame = [transitionContext finalFrameForViewController:toVC];
    CGRect startFrame;

    startFrame = CGRectOffset(endFrame, 0, endFrame.size.height);

    if (self.operation == UINavigationControllerOperationPop) {
        [animationContainerView insertSubview:toView belowSubview:fromView];
        [toView setFrame:endFrame];
    }
    else{
        [toView setFrame:startFrame];
        [animationContainerView insertSubview:toView aboveSubview:fromView];
    }

    [UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0.0 usingSpringWithDamping:0.7 initialSpringVelocity:0.8 options:UIViewAnimationOptionBeginFromCurrentState animations:^{

        if (self.operation …