Question

我已经添加了一个自定义动画过渡到视图控制器 - 显示和解散两者但它不能在iPhone 7模拟器（Xcode 8）中工作，但动画过渡在iPhone 6s和模拟器之前工作得非常好。

在iPhone 7模拟器上运行时，转换时会出现白色背景，然后显示下一个视图控制器。

不知道为什么会发生这种情况？有谁知道为什么？

CODE

#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

实际上它是iPhone 7和7Plus模拟器（Xcode 8.2.1）中的一个错误，因为它在iPhone 6s和之前的模拟器以及真实设备中都能正常工作。

参考here

自定义动画过渡不适用于iPhone 7模拟器

1 个答案: