Question

我正在制作自定义目标并解除过渡并且遇到一些问题。我想要做的是在iOS 7中重复这个很酷的深度动画（当我们打开/关闭一些应用程序时）。我有第一和第二控制器。所有动画都在First控制器中（它支持UIViewControllerTransitioningDelegate和UIViewControllerAnimatedTransitioning）。所以，我只是检查：如果它正在呈现 - 我正在做一个动画（放大第一和第二个视图），如果它正在解雇 - 我正在做另一个动画（缩小第一个和第二个视图）。当前动画工作正常，解雇动画时会出现问题。出于某种原因，当我缩小我的第二个控制器（它是UINavigationController）时，我看到它背后的黑色背景（这是错误的，因为我希望在它缩小时看到我的第一个控制器）。这是我的第一控制器代码

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
    UIView *transitionView = [transitionContext containerView];

    id toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    id fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];

    BOOL isPresenting;

    isPresenting = [toViewController isKindOfClass:[UINavigationController class]];

    UINavigationController *navigator = isPresenting ? toViewController : fromViewController;

    if (isPresenting) {
        [transitionView addSubview:navigator.view];
        navigator.view.transform = CGAffineTransformMakeScale(0.1, 0.1);
        navigator.view.alpha = 0;
    }

    navigator.view.center = self.startButton.center;

    void(^AnimationBlock)(void) = ^ {
        if (isPresenting) {
            navigator.view.transform = CGAffineTransformMakeScale(1, 1);
            self.view.transform = CGAffineTransformMakeScale(4, 4);
            navigator.view.alpha = 1;
            self.startButton.alpha = 0;
        } else {
            navigator.view.transform = CGAffineTransformMakeScale(0.1, 0.1);
            self.view.transform = CGAffineTransformMakeScale(1, 1);
            navigator.view.alpha = 0;
            self.startButton.alpha = 1;
        }
    };

    [UIView animateWithDuration:1
                          delay:0.0f
         usingSpringWithDamping:50.0
          initialSpringVelocity:4
                        options:UIViewAnimationOptionLayoutSubviews
                     animations:^{
                         AnimationBlock();
    } completion:^(BOOL finished) {
        [transitionContext completeTransition:YES];
        if (!isPresenting) {
            [navigator.view removeFromSuperview];
        }
    }];
}

- (void)completeTransitionInContext:(id<UIViewControllerContextTransitioning>)transitionContext{
    [transitionContext completeTransition:YES];
}


- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext{
    return 1;
}


- (id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source {
    return self;
}

- (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed {
    return self;
}

请告诉我是否应该提供一些额外的代码或屏幕。提前谢谢！

Answer 1

如果要在当前转换完成后将fromVC保留在窗口层次结构中，则需要在呈现它之前在toVC上设置modalPresentationStyle = UIModalPresentationCustom。

请参阅我对WWDC会话218的示例代码的实现：使用视图控制器进行自定义转换。如果单击“选项”，您将看到此类转换。相关代码位于SOLViewController.m prepareForSegue：和SOLOptionsTransitionAnimator.m

https://github.com/soleares/SOLPresentingFun

Answer 2

当您展示自定义VC时，您应该使用： vc.modalPresentationStyle = UIModalPresentationCustom; 但是，如果你输错了 vc.modalTransitionStyle = UIModalPresentationCustom; 您将在自定义VC后面获得黑色背景。

Answer 3

我认为在Parent ViewController中为Present和Dismiss动画使用两个单独的AnimationController类并实现UIViewControllerTransitioningDelegate（animationControllerForPresentedController和animationControllerForDismissedController）是个好主意。

创建AnimationController子类NSObject并在那里实现UIViewControllerAnimatedTransitioning。

希望它有所帮助。

ios 7自定义呈现和解除过渡

3 个答案: