为 UIView 创建动画以与 UINavigationController 推送/弹出一致答案

【问题标题】：Create an animation for UIView to coincide with UINavigationController push/pop为 UIView 创建动画以与 UINavigationController 推送/弹出一致
【发布时间】：2014-08-14 00:04:15
【问题描述】：

我的应用程序的初始 ViewController 有 2 个容器视图：第一个包含一个 ViewController，里面是一个 UINavigationController，它控制应用程序的主要内容。初始 VC 的第二个容器视图是一个带有 UILabel 的小条，位于导航栏所在位置的正下方。

主内容VC的导航栈的初始VC隐藏了导航栏。所有后续 VC 将显示导航栏以及初始 VC 的第二个容器视图。当应用程序离开导航堆栈的初始 VC 时，我想在第二个容器 VC 中设置动画。

我的问题是，我需要创建什么动画来匹配导航控制器在将 VC 推入/弹出导航堆栈时执行的动画？我目前正在使用：

[UIView animateWithDuration:0.27f delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
    self.playerCardVC.frame = secondFrame;
} completion:nil];

但是当导航栏动画进入视图时，它并不完全匹配。任何想法/想法将不胜感激。

更新：

我一直在网上搜索此问题的答案，并尝试调整我最初问题中发布的动画，但似乎无法完美匹配导航栏的动画效果。任何正确方向的 cmets 或点将不胜感激。

【问题讨论】：

标签： ios objective-c uinavigationcontroller uicontainerview

【解决方案1】：

从上面的描述很难理解你的视图层次和导航设计，也许你可以发布一些截图或草图？

您可以覆盖 UINavigationController 的标准水平推送/弹出动画。您可以通过定义自定义 UINavigationControllerDelegate 对象和其他一些东西来做到这一点。见下文。

像这样设置你的 navController 和 navControllerDelegate：

UINavigationController *navigationController = [[UINavigationController alloc] init];
self.navigationControllerDelegate = [[NavigationControllerDelegate alloc] init];
navigationController.delegate = self.navigationControllerDelegate;

NavigationControllerDelegate 类如下所示：

@interface NavigationControllerDelegate : NSObject <UINavigationControllerDelegate>

@end


#import "NavigationControllerDelegate.h"
#import "CrossFadePushAnimator.h"
#import "CrossFadePopAnimator.h"

@interface NavigationControllerDelegate ()

@property (nonatomic, strong) CrossFadePushAnimator* pushAnimator;
@property (nonatomic, strong) CrossFadePopAnimator* popAnimator;

@end

@implementation NavigationControllerDelegate

- (id)init
{
    self = [super init];
    if (self)
    {
        self.pushAnimator = [CrossFadePushAnimator new];
        self.popAnimator = [CrossFadePopAnimator new];
    }

    return self;
}

- (id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController animationControllerForOperation:(UINavigationControllerOperation)operation fromViewController:(UIViewController *)fromVC toViewController:(UIViewController *)toVC
    {
    if (operation == UINavigationControllerOperationPop)
    {
        return self.popAnimator;
    }
    else if (operation == UINavigationControllerOperationPush)
    {
        return self.pushAnimator;
    }

    return nil;
}

- (id<UIViewControllerInteractiveTransitioning>)navigationController:(UINavigationController *)navigationController interactionControllerForAnimationController:(id<UIViewControllerAnimatedTransitioning>)animationController
{
    return nil;
}

pushAnimator 看起来像这样：

@interface CrossFadePushAnimator ()

@property (nonatomic, strong) id<UIViewControllerContextTransitioning> transitionContext;

@end

@implementation CrossFadePushAnimator

- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext
{
    return AnimationDuration;
}

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
    UIViewController* toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
//    UIViewController* fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];

    [[transitionContext containerView] addSubview:toViewController.view];
    toViewController.view.alpha = 1.0f;

    // We are using CAAnimation instead of UIView animation because we need the UIToolbar blur layer to animate
    CABasicAnimation *fade = [CABasicAnimation animationWithKeyPath:@"opacity"];
    fade.fromValue = @0;
    fade.toValue = @1;
    fade.duration = [self transitionDuration:transitionContext];
    fade.removedOnCompletion = YES;
    fade.delegate = self;

    self.transitionContext = transitionContext;
    [toViewController.view.layer addAnimation:fade forKey:AnimationKey];
}

- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag
{
    [self.transitionContext completeTransition:![self.transitionContext transitionWasCancelled]];
    self.transitionContext = nil;
}

popAnimator 看起来有点像 pushAnimator。

希望这会有所帮助！

【讨论】：

【解决方案2】：