iphone – UIPercentDrivenInteractiveTransition cancelTransition将屏幕变黑

2019年7月21日 206次阅读

我正在实现自定义导航过渡,并使用UIPercentDrivenInteractiveTransition来完成这一操作.

我有非交互过渡工作正常,我正在使用动画块来处理过渡动画,但是一旦我在交互式过渡中添加,如果我取消过渡,屏幕现在变黑.

这是我跟踪手势的代码：

-(void)userDidPan:(UIScreenEdgePanGestureRecognizer *)recognizer {
        CGPoint location = [recognizer locationInView:nil];

    if (recognizer.state == UIGestureRecognizerStateBegan) {
        // We're being invoked via a gesture recognizer – we are necessarily interactive
        self.hasActiveInteraction = YES;
        self.interactiveTransition = [BXTPercentDrivenInteractiveTransition new];
        [[BXTNavigationController sharedNavigationController] popViewControllerAnimated:YES];
    }
    else if (recognizer.state == UIGestureRecognizerStateChanged) {
        CGFloat ratio = location.x / CGRectGetWidth(recognizer.view.frame);
        NSLog(@"Percentage complete: %0.2f",ratio*100);
        [self.interactiveTransition updateInteractiveTransition:ratio];
    }
    else if (recognizer.state == UIGestureRecognizerStateEnded) {
        // Depending on our state and the velocity, determine whether to cancel or complete the transition.
        CGFloat ratio = location.x / CGRectGetWidth(recognizer.view.frame);
        if (ratio > 0.50) {
            NSLog(@"Completing");
            [self.interactiveTransition finishInteractiveTransition];
        }
        else {
            NSLog(@"Canceling");
            [self.interactiveTransition cancelInteractiveTransition];
        }
    }
}

…当弹出视图控制器时,这是一个(缩写)查看我的动画块：

[UIView animateWithDuration:kBXTNavigationTimingDuration
                              delay:0
                            options:animationOption
                         animations:^{
                             toVC.view.frame = destinationFrameForPoppedView; 
                             fromVC.view.frame = CGRectOffset(fromVC.view.frame, fromVC.view.frame.size.width, 0);

                         } completion:^(BOOL finished) {
                             [darkeningView removeFromSuperview];
                             [_transition.secondaryTransitionViews enumerateObjectsUsingBlock:^(BXTTransitionView *transitionView, NSUInteger idx, BOOL *stop) {
                                 [transitionView.view removeFromSuperview];
                             }];

                             [transitionContext completeTransition:![transitionContext transitionWasCancelled]];
                         }];

在使用自定义导航过渡取消左侧滑动动画时,为什么屏幕会变黑？

最佳答案 解决了！我删除了动画完成块中的所有removeFromSuperview调用,它解决了它(我遇到了和你一样的问题,几乎相同的代码,请看我对你的评论’).尝试从代码中删除这些行：

[darkeningView removeFromSuperview];
[_transition.secondaryTransitionViews enumerateObjectsUsingBlock:^(BXTTransitionView *transitionView, NSUInteger idx, BOOL *stop) {
    [transitionView.view removeFromSuperview];
}];
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