IOS/Objective-C:导航栏自定义Segue效果对比Show Segue
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【中文标题】IOS/Objective-C:导航栏自定义Segue效果对比Show Segue【英文标题】:IOS/Objective-C: Custom Segue Effect on Navigation Bar Compared with Show Segue 【发布时间】:2018-09-10 22:53:18 【问题描述】:我有两个视图控制器,我使用常规的 Show Segue(从右到左)向一个方向移动,使用自定义的 Segue(从左到右)向另一个方向移动。我认为我不应该放松,因为两个 VC 都不从属于其他 VC,并且使用这些 segues 意味着一个导航控制器可以管理事情。
在两个 VC 的左上角,我有一个包含个人资料照片的公共 BarButton。
使用常规的从右到左 Segue 时,栏按钮上的个人资料照片保持不变。当屏幕的其余部分移入时,这看起来很棒,但两者共有的元素,个人资料照片保持在原位。
但是,在另一个方向(从左到右),使用自定义 segue,包括导航栏在内的整个 VC 屏幕突然进入,您基本上会看到个人资料照片从左边缘进入,然后停留在正常的左栏中同一张照片之前的按钮位置。这看起来很糟糕。
有没有办法强制导航栏中的公共元素在自定义转场期间保持原位,以更好地模仿系统显示转场的行为?
提前感谢您的任何建议。
这是我的自定义转场代码:
#import "customSegue.h"
#import "QuartzCore/QuartzCore.h"
@implementation customSegue
-(void)perform
UIViewController *destinationController = (UIViewController*)[self destinationViewController];
UIViewController *sourceViewController = (UIViewController*)[self sourceViewController];
CGFloat animationDuration = .40;
transition.duration = animationDuration;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault];
transition.type = kCATransitionMoveIn;
transition.subtype = kCATransitionFromLeft;
[sourceViewController.navigationController.view.layer addAnimation:transition
forKey:kCATransition];
UIColor *previousWindowBackgroundColor = sourceViewController.view.window.backgroundColor;
sourceViewController.view.window.backgroundColor = destinationController.view.backgroundColor;
[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;
);
@end
【问题讨论】:
【参考方案1】:你好@user6631314
我认为你不会通过使用 CATransition 并将其附加到 navigationController 视图的层来获得你想要的。
相反,我建议将 presentingViewController 设置为 UINavigationController 的委托,并为 LTR 推送滚动您自己的逻辑(导航栏会更加流畅,您不必再担心过渡期间的黑条我之前的回复帮助您解决/解决方法)。
为此,您需要将呈现视图控制器(或一些协调器视图控制器)设置为 UINavigationControllerDelegate 并实现此方法:
- (id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
animationControllerForOperation:(UINavigationControllerOperation)operation
fromViewController:(UIViewController*)fromVC
toViewController:(UIViewController*)toVC
在该方法中,您需要检查操作是否为 UINavigationControllerOperationPush
,如果是,则返回符合 UIViewControllerAnimatedTransitioning
协议的 NSObject 子类(否则返回 nil 以允许所有其他导航操作成为标准) .在该类中,您将处理自定义导航控制器推送动画覆盖。
LTR 推送动画的基本逻辑是,您要在屏幕左侧启动 toView,然后对其进行动画处理,使其在动画持续时间(代码中的 0.4)后完全显示在屏幕上——因此启动x 位置偏移到视图宽度的负值(因此它完全在屏幕外),然后在动画期间将 x 位置设置为 0(或者您可以只是 += 视图的宽度)。
这是当前自定义 segue 实现的示例(请注意导航栏也会滑过,这是您在此处发布的问题):
以及使用自定义动画控制器的过渡:
完整代码如下:
#import "ViewController.h"
#import "LTRPushAnimator.h"
@interface ViewController () < UINavigationControllerDelegate>
@property (strong, nullable) UIView *profileView;
@end
@implementation ViewController
- (void)viewDidLoad
[super viewDidLoad];
self.navigationController.delegate = self;
self.navigationItem.hidesBackButton = YES;
self.profileView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 40, 40)];
UIImageView *profileImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Homer.jpg"]];
[profileImageView setFrame:CGRectMake(0, 0, 40, 40)];
profileImageView.layer.cornerRadius = 20.0f;
profileImageView.layer.masksToBounds = YES;
profileImageView.clipsToBounds = YES;
profileImageView.layer.borderColor = [UIColor blackColor].CGColor;
profileImageView.layer.borderWidth = 1.0f;
[self.profileView addSubview:profileImageView];
UIBarButtonItem *lbi = [[UIBarButtonItem alloc] initWithCustomView:self.profileView];
self.navigationItem.leftBarButtonItem = lbi;
// Do any additional setup after loading the view, typically from a nib.
- (void)viewDidAppear:(BOOL)animated
[super viewDidAppear:animated];
- (IBAction)pushFakeViewController:(id)sender
UIViewController *fakeViewController = [[UIViewController alloc] init];
fakeViewController.view.backgroundColor = [UIColor redColor];
UIBarButtonItem *lbi = [[UIBarButtonItem alloc] initWithCustomView:self.profileView];
fakeViewController.navigationItem.leftBarButtonItem = lbi;
fakeViewController.navigationItem.hidesBackButton = YES;
[self.navigationController pushViewController:fakeViewController animated:YES];
// this is just in here to pop back to the root view controller since we removed the back button, it can be removed obviously
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0f * NSEC_PER_SEC)), dispatch_get_main_queue(), ^
[self.navigationController popViewControllerAnimated:YES];
);
- (id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
animationControllerForOperation:(UINavigationControllerOperation)operation
fromViewController:(UIViewController*)fromVC
toViewController:(UIViewController*)toVC
if (operation == UINavigationControllerOperationPush)
return [[LTRPushAnimator alloc] init];
// otherwise standard animation
return nil;
@end
LTRPushAnimator.h
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
NS_ASSUME_NONNULL_BEGIN
@interface LTRPushAnimator : NSObject <UIViewControllerAnimatedTransitioning>
@end
NS_ASSUME_NONNULL_END
LTRPushAnimator.m
#import "LTRPushAnimator.h"
@implementation LTRPushAnimator
- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext
return 0.4;
- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
[self _animatePushByFrameWithContext:transitionContext];
- (void)_animatePushByFrameWithContext:(id<UIViewControllerContextTransitioning>)transitionContext
UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
CGRect toVCFrame = toViewController.view.frame;
CGFloat viewWidth = toVCFrame.size.width;
toVCFrame.origin.x -= viewWidth;
[toViewController.view setFrame:toVCFrame];
[[transitionContext containerView] addSubview:toViewController.view];
[UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^
CGRect finalVCFrame = toViewController.view.frame;
finalVCFrame.origin.x = 0;
[toViewController.view setFrame:finalVCFrame];
completion:^(BOOL finished)
[transitionContext completeTransition:![transitionContext transitionWasCancelled]];
];
@end
【讨论】:
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