Question

我将UIStoryboardSegue子类化为创建从左到右的Segue。 segue起作用，但是，在损害效果的两个View Controller之间暂时可见黑色竖线或背景。（我希望segue看起来像正常的从右到左显示segue，但方向相反）。有谁知道这是什么原因或如何消除它？这是我的代码：

#import "customSegue.h"
#import "QuartzCore/QuartzCore.h"

@implementation customSegue

-(void)perform {

    UIViewController *sourceViewController = (UIViewController*)[self sourceViewController];
    UIViewController *destinationController = (UIViewController*)[self destinationViewController];

    CATransition* transition = [CATransition animation];
    transition.duration = .25;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    transition.type = kCATransitionPush; //kCATransitionMoveIn; //, kCATransitionPush, kCATransitionReveal, kCATransitionFade
    transition.subtype = kCATransitionFromLeft; //kCATransitionFromLeft, kCATransitionFromRight, kCATransitionFromTop, kCATransitionFromBottom



    [sourceViewController.navigationController.view.layer addAnimation:transition
                                                                forKey:kCATransition];

    [sourceViewController.navigationController pushViewController:destinationController animated:NO];

}
@end

编辑：

我想我会收集一些发现的建议修复程序，尽管没有一个对我有用。

将演示视图控制器的背景色设置为白色

Set self.definesPresentationContext = YES;在演示视图控制器上，或从已接受的答案here中检查情节提要中VC的“定义上下文”。

指定如下上下文：

UIViewController *rootViewController = [UIApplication sharedApplication].delegate.window.rootViewController;
    rootViewController.modalPresentationStyle = UIModalPresentationCurrentContext;
    UIViewController *destinationController = (UIViewController*)[self destinationViewController]
    [sourceViewController presentViewController:destinationController animated:NO completion:nil];

从接受的答案here中获得。

Answer 1

您所看到的是视图在动画的开始和结尾附近的不透明度不断变化，因此您看到的“黑条”实际上是后备窗口。尽管这可能并不完美，但一种快速的解决方法是更改窗口的背景颜色以使其与目标视图控制器的背景颜色匹配（然后在过渡完成后根据需要将其重新设置）。

这是您的代码示例，其中包含必要的修改：

-(void)perform {
    UIViewController *sourceViewController = (UIViewController*)[self sourceViewController];
    UIViewController *destinationController = (UIViewController*)[self destinationViewController];

    CATransition* transition = [CATransition animation];
    CGFloat animationDuration = 0.25f;
    transition.duration = animationDuration;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    transition.type = kCATransitionPush; //kCATransitionMoveIn; //, kCATransitionPush, kCATransitionReveal, kCATransitionFade
    transition.subtype = kCATransitionFromLeft; //kCATransitionFromLeft, kCATransitionFromRight, kCATransitionFromTop, kCATransitionFromBottom
    transition.fillMode = kCAFillModeForwards;



    [sourceViewController.navigationController.view.layer addAnimation:transition
                                                                forKey:kCATransition];
    // hold onto the previous window background color
    UIColor *previousWindowBackgroundColor = sourceViewController.view.window.backgroundColor;
    // switch the window background color to match the destinationController's background color temporarily
    sourceViewController.view.window.backgroundColor = destinationController.view.backgroundColor;
    // do the transition
    [sourceViewController.navigationController pushViewController:destinationController animated:NO];
    // switch the window color back after the transition duration from above
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(animationDuration * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        // make sure we still have a handle on the destination controller
        if (destinationController) {
            destinationController.view.window.backgroundColor = previousWindowBackgroundColor;
        }
    });
}

以下是转换速度降低到2秒的示例：

Slowed down transition

代码中具有0.25的动画：

Your speed transition

IOS / Objective-C / Storyboard：从左到右的自定义Segue在视图控制器之间创建黑条

1 个答案: