我有两个视图控制器,在其中我使用常规的Show Segue(从右到左)沿一个方向前进,并使用定制的Segue(从左到右)沿另一个方向前进。我不认为我应该放松一下,因为任何一个VC都不从属于其他VC,并且使用这些设置意味着一个导航控制器可以管理事情。
在两个VC的左上角,我都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,条形按钮上的个人资料照片保持不变。当屏幕的其余部分向内移动时,这看起来很棒,但是两者的共同元素是个人资料照片保持在原位。
但是,从另一个方向(从左到右),使用自定义序列,整个VC屏幕(包括导航栏)就会突然进入,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按钮位置,刚才的照片是同一张。看起来不好
有什么方法可以在自定义segue期间强制导航栏中的公共元素保持在原位,以更好地模仿系统show segue的行为?
在此先感谢您的任何建议。
这是我的自定义序列代码:
#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
最佳答案
再次问好@ user6631314
我认为您不会通过使用CATransition进行应用并将其附加到navigationController视图的图层上来获得所需的内容。
相反,我建议将presentingViewController委托为UINavigationController的代表,并为LTR推送滚动您自己的逻辑(导航栏将更加平滑,并且您不必再担心过渡期间的黑栏,因为我先前的响应帮助您解决/解决方法)。
因此,您需要将呈现视图控制器(或某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,您将要检查操作是否为
UINavigationControllerOperationPush
,如果是,则返回符合UIViewControllerAnimatedTransitioning
协议的NSObject的子类(否则返回nil以使所有其他导航操作成为标准操作)。在该类中,您将处理自定义导航控制器的推送动画覆盖。LTR推送动画的基本逻辑是,您要在屏幕左侧向左启动toView,然后对其进行动画处理,以使其在动画持续时间(从代码开始为0.4)之后完全在屏幕上显示-因此开始x位置偏移设置为视图宽度的负值(因此完全不在屏幕上),然后在动画过程中将x位置设置为0(或者您可以+ =视图的宽度)。
这是当前自定义segue实现的外观示例(请注意导航栏也会滑过,这是您要在此处发布的问题):
通过使用自定义动画控制器进行过渡:
这是完整的代码:
#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