在自定义 Segue 上保持第一个 View Controller 可见答案

【问题标题】：Keep first View Controller visible on custom Segue在自定义 Segue 上保持第一个 View Controller 可见
【发布时间】：2015-07-31 23:06:10
【问题描述】：

我有三个视图控制器，它们的排列方式类似于 snapchat。 main 嵌入在 UINavigationController 中，位于中间，左侧是视图控制器，右侧是视图控制器。过渡效果很好，左/右动画。但是在 snapchat 中，当您切换到相机旁边的控制器或反之亦然时，相机将在自定义 segue 上保持可见（而不是黑色）。有了我的，如果我将第二个视图控制器推入堆栈，当我希望它保持完全可见时，第一个视图控制器似乎会随着动画的开始淡化为黑色。我猜我必须在我的自定义 segue 中改变一些东西。

 @implementation toTheRight

- (void) perform{
UIViewController *sourceViewController = (UIViewController *)self.sourceViewController;
UIViewController *destinationViewController = (UIViewController *)self.destinationViewController;

CATransition *transition = [CATransition animation];
transition.duration = .5;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionPush;
transition.subtype = kCATransitionFromRight;

[sourceViewController.navigationController.view.layer addAnimation:transition forKey:kCATransition];
[sourceViewController.navigationController pushViewController:destinationViewController animated:NO];
}

【问题讨论】：

标签： ios xcode uinavigationcontroller uistoryboardsegue

【解决方案1】：

以这两个项目中修改CustomSegue和CustomUnwindSegue为例。 https://github.com/soleares/SOLPresentingFun https://github.com/Phillipus/CustomSegue

CustomSegue.m

#import "CustomSegue.h"
#import "SOLSlideTransitionAnimator.h"

@interface CustomSegue()<UIViewControllerTransitioningDelegate>
@property (nonatomic,strong) SOLSlideTransitionAnimator* animator;
@end

@implementation CustomSegue

- (void)perform {
    UIViewController *sourceViewController = self.sourceViewController;
    UIViewController *destinationViewController = self.destinationViewController;

    destinationViewController.transitioningDelegate = self;
    destinationViewController.modalPresentationStyle = UIModalPresentationCustom;

    [sourceViewController presentViewController:destinationViewController animated:YES completion:nil];
}

/*
 Called when presenting a view controller that has a transitioningDelegate
 */
- (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented
                                                                  presentingController:(UIViewController *)presenting
                                                                      sourceController:(UIViewController *)source
{
    self.animator.appearing = YES;
    return self.animator;
}

-(SOLSlideTransitionAnimator*) animator
{
    if(!_animator)
    {
        _animator = [[SOLSlideTransitionAnimator alloc] init];
        _animator.appearing = NO;
        _animator.duration = 0.35;
        _animator.edge = SOLEdgeRight;
    }
    return _animator;
}

@end

CustomUnwindSegue.m

@interface CustomUnwindSegue()<UIViewControllerTransitioningDelegate>
@property (nonatomic,strong) SOLSlideTransitionAnimator* animator;
@end



#import "CustomUnwindSegue.h"
#import "SOLSlideTransitionAnimator.h"

@implementation CustomUnwindSegue

- (void)perform {
    UIViewController *sourceViewController = self.sourceViewController;

    sourceViewController.transitioningDelegate = self;
    sourceViewController.modalPresentationStyle = UIModalPresentationCustom;

    [sourceViewController dismissViewControllerAnimated:YES completion:nil];
}

-(SOLSlideTransitionAnimator*) animator
{
    if(!_animator)
    {
        _animator = [[SOLSlideTransitionAnimator alloc] init];
        _animator.appearing = NO;
        _animator.duration = 0.35;
        _animator.edge = SOLEdgeRight;
    }
    return _animator;
}

/*
 Called when dismissing a view controller that has a transitioningDelegate
 */
- (id<UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed
{
    self.animator.appearing = NO;
    return self.animator;
}

@end

【讨论】：