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

Question

我已将 UIStoryboardSegue 子类化以创建从左到右的 Segue。 segue 有效，但是，在两个 View Controller 之间暂时可见的黑色垂直条或背景会破坏效果。（我希望 segue 看起来像正常的从右到左显示 segue，但方向相反）。有谁知道可能导致这种情况的原因或如何摆脱它？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：

虽然 none 对我有用，但我想我会收集一些我发现的建议修复。

将呈现视图控制器的背景颜色设置为白色

Set self.definesPresentationContext = YES; 在呈现视图控制器上或检查 "Defines Context" 以获取已接受答案 .

中故事板中的 VC

指定上下文如下：

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

来自已接受的答案 here。

Answer 1

您看到的是视图在动画开始和结束附近不断变化的不透明度，因此您看到的 "black bar" 实际上是背景 window。虽然它可能并不完美，但一个快速的解决方法是更改 window 的背景颜色以匹配目标视图控制器的背景颜色（如果需要，然后在转换完成后将其设置回来）。

这是经过必要修改的代码示例：

-(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;
        }
    });
}

这里有一个过渡减慢到 2 秒的例子：

Slowed down transition

还有代码中 0.25 处的动画：

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

IOS/Objective-C/Storyboard: Custom Segue from Left to Right Creating Black Bar Between View Controllers

ios

objective-c

storyboard

uistoryboardsegue