Question

我想在屏幕上向右滑动时弹出一个视图，或者它像导航栏的后退按钮一样工作。

我正在使用：

self.navigationController.interactivePopGestureRecognizer.delegate = (id<UIGestureRecognizerDelegate>)self;

流行导航视图的这一行代码，对我来说很有用，但是当我在屏幕中间滑动时，这将无法像Instagram iPhone应用程序一样工作。

在这里，我给出了一个Instagram应用程序的屏幕，你可以看到滑动右侧弹出导航视图的示例：

enter image description here

Answer 1

苹果公司自动实施“刷卡直播VC”仅适用于屏幕左侧~20点。这样，他们确保他们不会弄乱您的应用程序的功能。想象一下，屏幕上有UIScrollView，你无法向右滑动，因为它会不断弹出VC。这不太好。

Apple说here：

<强> interactivePopGestureRecognizer

手势识别器负责将顶视图控制器弹出导航堆栈。（只读）

@property（非原子，只读）UIGestureRecognizer * interactivePopGestureRecognizer

导航控制器在其视图上安装此手势识别器   并使用它从导航中弹出最顶层的视图控制器   堆。您可以使用此属性来检索手势识别器   并将其与用户中其他手势识别器的行为联系起来   接口。将手势识别器绑在一起时，请确保   他们同时认出他们的姿势，以确保你的   手势识别器有机会处理该事件。

因此，您必须实施自己的UIGestureRecognizer，并将其行为与interactivePopGestureRecognizer的{{1}}联系起来。

修改：

这是我建立的解决方案。您可以实现符合UIViewController委托的自己的转换。此解决方案有效，但尚未经过全面测试。

您将获得交互式滑动过渡以弹出ViewControllers。您可以从视图中的任何位置向右滑动。

已知问题：如果启动平移并在视图宽度的一半之前停止，则转换将被取消（预期行为）。在此过程中，视图将重置为其原始帧。在这个动画中，它们是一个视觉故障。

示例的类如下：

UINavigationController＆gt; ViewController＆gt; SecondViewController

CustomPopTransition.h ：

UIViewControllerAnimatedTransitioning

CustomPopTransition.m ：

#import <Foundation/Foundation.h>

@interface CustomPopTransition : NSObject <UIViewControllerAnimatedTransitioning>

@end

SecondViewController.h ：

#import "CustomPopTransition.h"
#import "SecondViewController.h"
#import "ViewController.h"

@implementation CustomPopTransition

- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext {
    return 0.3;
}

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {

    SecondViewController *fromViewController = (SecondViewController*)[transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    ViewController *toViewController = (ViewController*)[transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];

    UIView *containerView = [transitionContext containerView];
    [containerView addSubview:toViewController.view];
    [containerView bringSubviewToFront:fromViewController.view];

    // Setup the initial view states
    toViewController.view.frame = [transitionContext finalFrameForViewController:toViewController];

    [UIView animateWithDuration:0.3 animations:^{

        fromViewController.view.frame = CGRectMake(toViewController.view.frame.size.width, fromViewController.view.frame.origin.y, fromViewController.view.frame.size.width, fromViewController.view.frame.size.height);

    } completion:^(BOOL finished) {

        // Declare that we've finished
        [transitionContext completeTransition:!transitionContext.transitionWasCancelled];
    }];

}

@end

SecondViewController.m ：

#import <UIKit/UIKit.h>

@interface SecondViewController : UIViewController <UINavigationControllerDelegate>

@end

Answer 2

这是Spynet的Swift版本的答案，只做了一些修改。首先，我为UIView动画定义了一条线性曲线。其次，我在下方的视图中添加了半透明的黑色背景，以获得更好的效果。第三，我已经将UINavigationController子类化了。这允许过渡应用于任何＆＃34; Pop＆＃34; UINavigationController中的转换。这是代码：

<强> CustomPopTransition.swift

import UIKit

class CustomPopTransition: NSObject, UIViewControllerAnimatedTransitioning {

    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return 0.3
    }

    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        guard let fromViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from),
            let toViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to)
            else {
                return
        }

        let containerView = transitionContext.containerView
        containerView.insertSubview(toViewController.view, belowSubview: fromViewController.view)

        // Setup the initial view states
        toViewController.view.frame = CGRect(x: -100, y: toViewController.view.frame.origin.y, width: fromViewController.view.frame.size.width, height: fromViewController.view.frame.size.height)

        let dimmingView = UIView(frame: CGRect(x: 0,y: 0, width: toViewController.view.frame.width, height: toViewController.view.frame.height))
        dimmingView.backgroundColor = UIColor.black
        dimmingView.alpha = 0.5

        toViewController.view.addSubview(dimmingView)

        UIView.animate(withDuration: transitionDuration(using: transitionContext),
                       delay: 0,
                       options: UIView.AnimationOptions.curveLinear,
                       animations: {
                        dimmingView.alpha = 0
                        toViewController.view.frame = transitionContext.finalFrame(for: toViewController)
                        fromViewController.view.frame = CGRect(x: toViewController.view.frame.size.width, y: fromViewController.view.frame.origin.y, width: fromViewController.view.frame.size.width, height: fromViewController.view.frame.size.height)
        },
                       completion: { finished in
                        dimmingView.removeFromSuperview()
                        transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
        }
        )
    }
}

<强> PoppingNavigationController.swift

import UIKit

class PoppingNavigationController : UINavigationController, UINavigationControllerDelegate {
    var interactivePopTransition: UIPercentDrivenInteractiveTransition!

    override func viewDidLoad() {
        self.delegate = self
    }

    func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {
        addPanGesture(viewController: viewController)
    }

    func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationController.Operation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        if (operation == .pop) {
            return CustomPopTransition()
        }
        else {
            return nil
        }
    }

    func navigationController(navigationController: UINavigationController, interactionControllerForAnimationController animationController: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
        if animationController.isKind(of: CustomPopTransition.self) {
            return interactivePopTransition
        }
        else {
            return nil
        }
    }

    func addPanGesture(viewController: UIViewController) {
        let popRecognizer = UIPanGestureRecognizer(target: self, action: #selector(handlePanRecognizer(recognizer:)))
        viewController.view.addGestureRecognizer(popRecognizer)
    }

    @objc
    func handlePanRecognizer(recognizer: UIPanGestureRecognizer) {
        // Calculate how far the user has dragged across the view
        var progress = recognizer.translation(in: self.view).x / self.view.bounds.size.width
        progress = min(1, max(0, progress))
        if (recognizer.state == .began) {
            // Create a interactive transition and pop the view controller
            self.interactivePopTransition = UIPercentDrivenInteractiveTransition()
            self.popViewController(animated: true)
        }
        else if (recognizer.state == .changed) {
            // Update the interactive transition's progress
            interactivePopTransition.update(progress)
        }
        else if (recognizer.state == .ended || recognizer.state == .cancelled) {
            // Finish or cancel the interactive transition
            if (progress > 0.5) {
                interactivePopTransition.finish()
            }
            else {
                interactivePopTransition.cancel()
            }
            interactivePopTransition = nil
        }
    }
}

结果示例：

Answer 3

对UINavigationController进行子类化，您可以添加UISwipeGestureRecognizer来触发弹出操作：

.h文件：

#import <UIKit/UIKit.h>

@interface CNavigationController : UINavigationController

@end

.m文件：

#import "CNavigationController.h"

@interface CNavigationController ()<UIGestureRecognizerDelegate, UINavigationControllerDelegate>

@property (nonatomic, retain) UISwipeGestureRecognizer *swipeGesture;

@end

@implementation CNavigationController

#pragma mark - View cycles

- (void)viewDidLoad {
    [super viewDidLoad];

    __weak CNavigationController *weakSelf = self;
    self.delegate = weakSelf;

    self.swipeGesture = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(gestureFired:)];
    [self.view addGestureRecognizer:self.swipeGesture]; }

#pragma mark - gesture method

-(void)gestureFired:(UISwipeGestureRecognizer *)gesture {
    if (gesture.direction == UISwipeGestureRecognizerDirectionRight)
    {
        [self popViewControllerAnimated:YES];
    } }

#pragma mark - UINavigation Controller delegate

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
    self.swipeGesture.enabled = NO;
    [super pushViewController:viewController animated:animated]; }

#pragma mark UINavigationControllerDelegate

- (void)navigationController:(UINavigationController *)navigationController
       didShowViewController:(UIViewController *)viewController
                    animated:(BOOL)animate {
    self.swipeGesture.enabled = YES; }

@end

Answer 4

确实没有必要为此推出自己的解决方案，对UINavigationController进行子类化并引用内置手势就像解释here一样正常。

Swift中的相同解决方案：

public final class MyNavigationController: UINavigationController {

  public override func viewDidLoad() {
    super.viewDidLoad()


    self.view.addGestureRecognizer(self.fullScreenPanGestureRecognizer)
  }

  private lazy var fullScreenPanGestureRecognizer: UIPanGestureRecognizer = {
    let gestureRecognizer = UIPanGestureRecognizer()

    if let cachedInteractionController = self.value(forKey: "_cachedInteractionController") as? NSObject {
      let string = "handleNavigationTransition:"
      let selector = Selector(string)
      if cachedInteractionController.responds(to: selector) {
        gestureRecognizer.addTarget(cachedInteractionController, action: selector)
      }
    }

    return gestureRecognizer
  }()
}

如果这样做，还要实现以下UINavigationControllerDelegate函数以避免在根视图控制器上出现奇怪的行为：

public func navigationController(_: UINavigationController,
                                 didShow _: UIViewController, animated _: Bool) {
  self.fullScreenPanGestureRecognizer.isEnabled = self.viewControllers.count > 1
}

Answer 5

创建一个平移手势识别器，并在其中移动交互式弹出手势识别器的目标。

将您的识别器添加到推送的视图控制器的viewDidLoad中，瞧！

let popGestureRecognizer = self.navigationController!.interactivePopGestureRecognizer!
if let targets = popGestureRecognizer.value(forKey: "targets") as? NSMutableArray {
  let gestureRecognizer = UIPanGestureRecognizer()
  gestureRecognizer.setValue(targets, forKey: "targets")
  self.view.addGestureRecognizer(gestureRecognizer)
}

Answer 6

我通过使用此库https://github.com/ykyouhei/KYDrawerController实现了这一目标我将屏幕宽度更改为_drawerWidth = self.view.bounds.size.width; 这是我想要的工作

像Instagram iPhone应用程序一样向右滑动导航弹出视图。我如何实现这一目标？

6 个答案: