自定义动画过渡不适用于 iPhone 7 模拟器

Question

我已将自定义动画过渡添加到视图控制器 - 两者都显示和关闭，但它在 iPhone 7 模拟器 (Xcode 8) 中不起作用，但动画过渡在 iPhone 6s 和之前的模拟器中运行良好。

在 iPhone 7 Simulator 上运行时，过渡时会出现白色背景，然后显示下一个视图控制器。

不知道为什么会这样？有人知道为什么吗？

代码

#import "HEREINExpandAnimator.h"

#define kTransitionDuration 0.65

@interface HEREINExpandAnimator ()
{
    UIView *topView;
    UIView *bottomView;
}

@end
@implementation HEREINExpandAnimator


+ (id)animator {
    static HEREINExpandAnimator *animator = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        animator = [[self alloc] init];
    });
    return animator;
}

#pragma mark - UIViewControllerAnimatedTransitioning

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

- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext
{
    // From VC
    UIViewController *fromController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];

    CGRect fromViewFrame = fromController.view.frame;

    // To VC
    UIViewController *toController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];

    // Container View
    UIView* container = [transitionContext containerView];


    if (self.transitionMode == Presented) {

        //create snapshots
        topView = [fromController.view resizableSnapshotViewFromRect:fromViewFrame afterScreenUpdates:YES withCapInsets:UIEdgeInsetsMake(self.openingFrame.origin.y, 0, 0, 0)];
        topView.frame = CGRectMake(0, 0, fromViewFrame.size.width, self.openingFrame.origin.y);

        //add our snapshots on top
        [container addSubview:topView];



        bottomView = [fromController.view resizableSnapshotViewFromRect:fromViewFrame afterScreenUpdates:YES withCapInsets:UIEdgeInsetsMake(0, 0, fromViewFrame.size.height - self.openingFrame.origin.y - self.openingFrame.size.height , 0)];
        bottomView.frame = CGRectMake(0, self.openingFrame.origin.y + self.openingFrame.size.height, fromViewFrame.size.width, fromViewFrame.size.height - self.openingFrame.origin.y - self.openingFrame.size.height);

        [container addSubview:bottomView];



        // Take snapshot of the to viewcontroller and change the height to the opening frame.

        UIView *snapshotView = [toController.view resizableSnapshotViewFromRect:fromViewFrame afterScreenUpdates:YES withCapInsets:UIEdgeInsetsZero];
        snapshotView.frame = self.openingFrame;


        [container addSubview:snapshotView];

        toController.view.alpha = 0.0;
        [self changeAlphaOfView:fromController.view withAlpha:0.0];

        [container addSubview:toController.view];


        [UIView animateWithDuration:kTransitionDuration delay:0 usingSpringWithDamping:0.85 initialSpringVelocity:1.5 options:UIViewAnimationOptionCurveEaseOut animations:^{
            //adjust the new frames

            topView.frame = CGRectMake(0, -topView.frame.size.height, topView.frame.size.width, topView.frame.size.height);
            bottomView.frame = CGRectMake(0, fromViewFrame.size.height, bottomView.frame.size.width, bottomView.frame.size.height);

            snapshotView.frame = toController.view.frame;

        } completion:^(BOOL finished) {
            //don't forget to clean up

            [UIView animateWithDuration:0.33 animations:^{
                [snapshotView removeFromSuperview];
            }];


            toController.view.alpha = 1.0;
            [self changeAlphaOfView:fromController.view withAlpha:1.0];

            [transitionContext completeTransition:finished];
        }];
    }
    else {

        UIView *snapshotView = [fromController.view resizableSnapshotViewFromRect:fromController.view.bounds afterScreenUpdates:YES withCapInsets:UIEdgeInsetsZero];
        [container addSubview:snapshotView];

        fromController.view.alpha = 0.0;

        [self changeAlphaOfView:toController.view withAlpha:0.0];


        [UIView animateWithDuration:0.55 delay:0 usingSpringWithDamping:1 initialSpringVelocity:0 options:UIViewAnimationOptionCurveLinear animations:^{
            topView.frame = CGRectMake(0, 0, topView.frame.size.width, topView.frame.size.height);
            bottomView.frame = CGRectMake(0, fromController.view.frame.size.height - bottomView.frame.size.height, bottomView.frame.size.width, bottomView.frame.size.height);

            snapshotView.frame = self.openingFrame;

        } completion:^(BOOL finished) {
            [snapshotView removeFromSuperview];

            fromController.view.alpha = 1.0;
            [self changeAlphaOfView:toController.view withAlpha:1.0];

            [transitionContext completeTransition:finished];
        }];


    }


}




-(void)changeAlphaOfView:(UIView *)contentView withAlpha:(CGFloat)alpha {
    contentView.backgroundColor =   [UIColor whiteColor];
    for (UIView *view in contentView.subviews) {
        view.alpha = alpha;
    }
}

Answer 1

实际上这是 iPhone 7 和 7Plus 模拟器 (Xcode 8.2.1) 中的一个错误，因为它在 iPhone 6s 和以前的模拟器中以及在真实设备中也可以正常工作。

参考here