手势识别器

Question

如何向UIView添加触摸事件？
我试试：

UIView *headerView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, tableView.bounds.size.width, nextY)] autorelease];
[headerView addTarget:self action:@selector(myEvent:) forControlEvents:UIControlEventTouchDown];
// ERROR MESSAGE: UIView may not respond to '-addTarget:action:forControlEvents:'

我不想创建子类并覆盖

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

Answer 1

在iOS 3.2及更高版本中，您可以使用手势识别器。例如，这是您处理点击事件的方式：

//The setup code (in viewDidLoad in your view controller)
UITapGestureRecognizer *singleFingerTap = 
  [[UITapGestureRecognizer alloc] initWithTarget:self 
                                          action:@selector(handleSingleTap:)];
[self.view addGestureRecognizer:singleFingerTap];

//The event handling method
- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer
{
  CGPoint location = [recognizer locationInView:[recognizer.view superview]];

  //Do stuff here...
}

还有一堆内置手势。查看iOS事件处理的文档和UIGestureRecognizer。我还在github上提供了大量可能有用的示例代码。

Answer 2

手势识别器

有许多常用的触摸事件（或手势），当您向视图添加Gesture Recognizer时，可以通知您。默认情况下支持以下手势类型：

UITapGestureRecognizer 点按（短暂触摸屏幕一次或多次）
UILongPressGestureRecognizer 长时间触摸（长时间触摸屏幕）
UIPanGestureRecognizer 平移（在屏幕上移动手指）
UISwipeGestureRecognizer 滑动（快速移动手指）
UIPinchGestureRecognizer 捏（将两根手指放在一起或分开 - 通常可以放大）
UIRotationGestureRecognizer 旋转（沿圆周方向移动两根手指）

除此之外，您还可以制作自己的自定义手势识别器。

在Interface Builder中添加手势

将手势识别器从对象库拖到视图上。

控制从文档大纲中的手势拖动到View Controller代码，以便制作Outlet和Action。

这应该默认设置，但也要确保为您的视图将启用用户操作设置为true。

以编程方式添加手势

要以编程方式添加手势，您（1）创建手势识别器，（2）将其添加到视图中，以及（3）创建识别手势时调用的方法。

import UIKit
class ViewController: UIViewController {

    @IBOutlet weak var myView: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // 1. create a gesture recognizer (tap gesture)
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleTap(sender:)))

        // 2. add the gesture recognizer to a view
        myView.addGestureRecognizer(tapGesture)
    }

    // 3. this method is called when a tap is recognized
    @objc func handleTap(sender: UITapGestureRecognizer) {
        print("tap")
    }
}

备注

sender参数是可选的。如果您不需要对手势的引用，那么您可以将其删除。但是，如果您这样做，请删除操作方法名称后的(sender:)。

handleTap方法的命名是任意的。使用action: #selector(someMethodName(sender:))命名它。

更多示例

您可以研究我添加到这些视图中的手势识别器，以了解它们的工作原理。

以下是该项目的代码：

import UIKit class ViewController: UIViewController { @IBOutlet weak var tapView: UIView! @IBOutlet weak var doubleTapView: UIView! @IBOutlet weak var longPressView: UIView! @IBOutlet weak var panView: UIView! @IBOutlet weak var swipeView: UIView! @IBOutlet weak var pinchView: UIView! @IBOutlet weak var rotateView: UIView! @IBOutlet weak var label: UILabel! override func viewDidLoad() { super.viewDidLoad() // Tap let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleTap)) tapView.addGestureRecognizer(tapGesture) // Double Tap let doubleTapGesture = UITapGestureRecognizer(target: self, action: #selector(handleDoubleTap)) doubleTapGesture.numberOfTapsRequired = 2 doubleTapView.addGestureRecognizer(doubleTapGesture) // Long Press let longPressGesture = UILongPressGestureRecognizer(target: self, action: #selector(handleLongPress(gesture:))) longPressView.addGestureRecognizer(longPressGesture) // Pan let panGesture = UIPanGestureRecognizer(target: self, action: #selector(handlePan(gesture:))) panView.addGestureRecognizer(panGesture) // Swipe (right and left) let swipeRightGesture = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipe(gesture:))) let swipeLeftGesture = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipe(gesture:))) swipeRightGesture.direction = UISwipeGestureRecognizerDirection.right swipeLeftGesture.direction = UISwipeGestureRecognizerDirection.left swipeView.addGestureRecognizer(swipeRightGesture) swipeView.addGestureRecognizer(swipeLeftGesture) // Pinch let pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(handlePinch(gesture:))) pinchView.addGestureRecognizer(pinchGesture) // Rotate let rotateGesture = UIRotationGestureRecognizer(target: self, action: #selector(handleRotate(gesture:))) rotateView.addGestureRecognizer(rotateGesture) } // Tap action @objc func handleTap() { label.text = "Tap recognized" // example task: change background color if tapView.backgroundColor == UIColor.blue { tapView.backgroundColor = UIColor.red } else { tapView.backgroundColor = UIColor.blue } } // Double tap action @objc func handleDoubleTap() { label.text = "Double tap recognized" // example task: change background color if doubleTapView.backgroundColor == UIColor.yellow { doubleTapView.backgroundColor = UIColor.green } else { doubleTapView.backgroundColor = UIColor.yellow } } // Long press action @objc func handleLongPress(gesture: UILongPressGestureRecognizer) { label.text = "Long press recognized" // example task: show an alert if gesture.state == UIGestureRecognizerState.began { let alert = UIAlertController(title: "Long Press", message: "Can I help you?", preferredStyle: UIAlertControllerStyle.alert) alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil)) self.present(alert, animated: true, completion: nil) } } // Pan action @objc func handlePan(gesture: UIPanGestureRecognizer) { label.text = "Pan recognized" // example task: drag view let location = gesture.location(in: view) // root view panView.center = location } // Swipe action @objc func handleSwipe(gesture: UISwipeGestureRecognizer) { label.text = "Swipe recognized" // example task: animate view off screen let originalLocation = swipeView.center if gesture.direction == UISwipeGestureRecognizerDirection.right { UIView.animate(withDuration: 0.5, animations: { self.swipeView.center.x += self.view.bounds.width }, completion: { (value: Bool) in self.swipeView.center = originalLocation }) } else if gesture.direction == UISwipeGestureRecognizerDirection.left { UIView.animate(withDuration: 0.5, animations: { self.swipeView.center.x -= self.view.bounds.width }, completion: { (value: Bool) in self.swipeView.center = originalLocation }) } } // Pinch action @objc func handlePinch(gesture: UIPinchGestureRecognizer) { label.text = "Pinch recognized" if gesture.state == UIGestureRecognizerState.changed { let transform = CGAffineTransform(scaleX: gesture.scale, y: gesture.scale) pinchView.transform = transform } } // Rotate action @objc func handleRotate(gesture: UIRotationGestureRecognizer) { label.text = "Rotate recognized" if gesture.state == UIGestureRecognizerState.changed { let transform = CGAffineTransform(rotationAngle: gesture.rotation) rotateView.transform = transform } } }

备注

您可以为单个视图添加多个手势识别器。但是为了简单起见，我没有这样做（滑动手势除外）。如果您需要参与项目，则应阅读gesture recognizer documentation。这是相当容易理解和有帮助的。

上述示例的已知问题：（1）平移视图在下一个手势事件中重置其帧。（2）第一次滑动时滑动视图来自错误的方向。（但是，我的示例中的这些错误不应影响您对手势识别器如何工作的理解。）

Answer 3

我认为你可以简单地使用

UIControl *headerView = ...
[headerView addTarget:self action:@selector(myEvent:) forControlEvents:UIControlEventTouchDown];

我的意思是headerView从UIControl扩展。

Answer 4

根据accepted answer，您可以定义一个宏：

#define handle_tap(view, delegate, selector) do {\
    view.userInteractionEnabled = YES;\
    [view addGestureRecognizer: [[UITapGestureRecognizer alloc] initWithTarget:delegate action:selector]];\
} while(0)

此宏使用ARC，因此没有release调用。

宏用法示例：

handle_tap(userpic, self, @selector(onTapUserpic:));

Answer 5

Swift 3＆amp;斯威夫特4

import UIKit

extension UIView {
  func addTapGesture(tapNumber: Int, target: Any, action: Selector) {
    let tap = UITapGestureRecognizer(target: target, action: action)
    tap.numberOfTapsRequired = tapNumber
    addGestureRecognizer(tap)
    isUserInteractionEnabled = true
  }
}

使用

yourView.addTapGesture(tapNumber: 1, target: self, action: #selector(yourMethod))

Answer 6

您可以在代码中添加Gesture Recogniser来实现这一目标。

第1步： ViewController.m：

// Declare the Gesture.
UITapGestureRecognizer *gesRecognizer = [[UITapGestureRecognizer alloc] 
                                          initWithTarget:self 
                                          action:@selector(handleTap:)];
gesRecognizer.delegate = self;

// Add Gesture to your view.
[yourView addGestureRecognizer:gesRecognizer];

第2步： ViewController.m：

// Declare the Gesture Recogniser handler method.
- (void)handleTap:(UITapGestureRecognizer *)gestureRecognizer{
   NSLog(@"Tapped");
}

注意：在我的案例中，您的查看是@property (strong, nonatomic) IBOutlet UIView *localView;

编辑： * localView是Main.storyboard中的白框，位于下方

Answer 7

Heres一个Swift版本：

// MARK: Gesture Extensions
extension UIView {

    func addTapGesture(#tapNumber: Int, target: AnyObject, action: Selector) {
        let tap = UITapGestureRecognizer (target: target, action: action)
        tap.numberOfTapsRequired = tapNumber
        addGestureRecognizer(tap)
        userInteractionEnabled = true
    }

    func addTapGesture(#tapNumber: Int, action: ((UITapGestureRecognizer)->())?) {
        let tap = BlockTap (tapCount: tapNumber, fingerCount: 1, action: action)
        addGestureRecognizer(tap)
        userInteractionEnabled = true
    }
}

Answer 8

斯威夫特3：

let tapGestureRecognizer: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleTapGestureRecognizer(_:)))
view.addGestureRecognizer(tapGestureRecognizer)

func handleTapGestureRecognizer(_ gestureRecognizer: UITapGestureRecognizer) {

}

Answer 9

在 Swift 4.2 和Xcode 10

中

使用 UITapGestureRecognizer 添加触摸事件

//Add tap gesture to your view
let tap = UITapGestureRecognizer(target: self, action: #selector(handleGesture))
yourView.addGestureRecognizer(tap)

// GestureRecognizer
@objc func handleGesture(gesture: UITapGestureRecognizer) -> Void {
//Write your code here
}

如果您要使用 SharedClass

//This is my shared class
import UIKit

class SharedClass: NSObject {

    static let sharedInstance = SharedClass()

    //Tap gesture function
    func addTapGesture(view: UIView, target: Any, action: Selector) {
        let tap = UITapGestureRecognizer(target: target, action: action)
        view.addGestureRecognizer(tap)
    }
}

我的ViewController中有3个视图，分别为view1，view2和view3。

override func viewDidLoad() {
    super.viewDidLoad()
    //Add gestures to your views
    SharedClass.sharedInstance.addTapGesture(view: view1, target: self, action: #selector(handleGesture))
    SharedClass.sharedInstance.addTapGesture(view: view2, target: self, action: #selector(handleGesture))
    SharedClass.sharedInstance.addTapGesture(view: view3, target: self, action: #selector(handleGesture2))

}

// GestureRecognizer
@objc func handleGesture(gesture: UITapGestureRecognizer) -> Void {
    print("printed 1&2...")
}
// GestureRecognizer
@objc func handleGesture2(gesture: UITapGestureRecognizer) -> Void {
    print("printed3...")
}

Answer 10

这几天看起来很简单。这是Swift版本。

let tap = UITapGestureRecognizer(target: self, action: #selector(viewTapped))
    view.addGestureRecognizer(tap)

@objc func viewTapped(recognizer: UIGestureRecognizer)
{
    //Do what you need to do!
}

Answer 11

Objective-C：

UIControl *headerView = [[UIControl alloc] initWithFrame:CGRectMake(0, 0, tableView.bounds.size.width, nextY)];
[headerView addTarget:self action:@selector(myEvent:) forControlEvents:UIControlEventTouchDown];

迅速：

let headerView = UIControl(frame: CGRect(x: 0, y: 0, width: tableView.bounds.size.width, height: nextY))
headerView.addTarget(self, action: #selector(myEvent(_:)), for: .touchDown)

问题问：

如何将 touch 事件添加到UIView？

它不是在请求 tap 事件。

特别是OP想要实现UIControlEventTouchDown

此处将UIView切换为UIControl是正确的答案，因为Gesture Recognisers对.touchDown，.touchUpInside，.touchUpOutside一无所知等

此外，UIControl继承自UIView，因此您不会失去任何功能。

如果只想轻按，则可以使用手势识别器。但是，如果您想要更好的控制（如该问题所要求的那样），则需要UIControl。

https://developer.apple.com/documentation/uikit/uicontrol?language=objc https://developer.apple.com/documentation/uikit/uigesturerecognizer?language=objc

Answer 12

这是ios tapgesture; 首先，您需要在下面的代码下编写以下代码后为GestureRecognizer创建操作，如下所示

- (IBAction)tapgesture:(id)sender

{


[_password resignFirstResponder];


[_username resignFirstResponder];

NSLog(@" TapGestureRecognizer  tapped");

}

Answer 13

另一种方法是在视图中添加透明按钮

UIButton *b = [UIButton buttonWithType:UIButtonTypeCustom];
b.frame = CGRectMake(0, 0, headerView.width, headerView.height);
[headerView addSubview:b];
[b addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchDown];

然后，处理点击：

- (void)buttonClicked:(id)sender
{}

Answer 14

创建一个手势识别器（子类），它将实现触摸事件，如touchesBegan。之后您可以将其添加到视图中。

这样你就可以使用组合代替子类化（这是请求）。

Answer 15

你们为什么不试试SSEventListener？

您无需创建任何手势识别器，并将您的逻辑与另一种方法分开。 SSEventListener支持在视图上设置监听器块以监听单击手势，双击手势和N-tap手势（如果您愿意），以及长按手势。设置单击手势监听器就是这样的：

[view ss_addTapViewEventListener:^(UITapGestureRecognizer *recognizer) { ... } numberOfTapsRequired:1];

如何向UIView添加触摸事件？

15 个答案:

手势识别器

在Interface Builder中添加手势

以编程方式添加手势

更多示例