如何将触摸事件添加到UIView？
如何添加触摸事件到UIView？
我尝试：
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build一个子类和覆盖
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
在iOS 3.2及更高版本中，您可以使用手势识别器。 例如，这是你将如何处理一个轻拍事件：
//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... }
还有一些内置的手势。 查看iOS事件处理和UIGestureRecognizer的文档。 我也有一堆示例代码在github上 ，可能有帮助。
手势识别器
有许多常用的触摸事件（或手势），当您将“ 手势识别器”添加到您的视图时，您会收到通知。 他们以下的手势types默认支持：
-
UITapGestureRecognizer点击 （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轻扫 （快速移动手指） -
UIPinchGestureRecognizer捏 （将两个手指放在一起或分开 – 通常放大） -
UIRotationGestureRecognizer旋转 （沿圆周方向移动两个手指）
除此之外，您还可以制作自己的自定义手势识别器。
在界面生成器中添加一个手势
将对象库中的手势识别器拖到您的视图中。
控制从“文档大纲”中的手势拖动到View Controller代码，以制作Outlet和Action。
以编程方式添加手势
要以编程方式添加手势，您（1）创build一个手势识别器，（2）将其添加到一个视图，（3）制作一个手势识别时调用的方法。
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 func handleTap(sender: UITapGestureRecognizer) { print("tap") } }
笔记
-
sender参数是可选的。 如果你不需要一个手势的参考，那么你可以把它放在外面。 但是，如果您这样做，请在创build手势时删除操作方法名称后的(_:)。 -
handleTap方法的命名是任意的。 使用action: #selector( someMethodName (sender:))命名它action: #selector( someMethodName (sender:))。
更多的例子
你可以研究我添加到这些视图的手势识别器，看看它们是如何工作的。
这是该项目的代码：
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 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 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 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 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 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 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 func handleRotate(gesture: UIRotationGestureRecognizer) { label.text = "Rotate recognized" if gesture.state == UIGestureRecognizerState.changed { let transform = CGAffineTransform(rotationAngle: gesture.rotation) rotateView.transform = transform } } }
笔记
- 您可以将多个手势识别器添加到单个视图。 为了简单起见，我没有这样做（除了滑动手势）。 如果你需要为你的项目，你应该阅读手势识别器的文档 。 这是相当可以理解和有益的。
- 我上面的例子已知的问题：（1）平移视图重置其框架下一个手势事件。 （2）第一次滑动时，滑动视图来自错误的方向。 （尽pipe我的示例中的这些错误不应该影响您对“手势识别器”如何工作的理解）。
更新了Swift 3
我想你可以简单地使用
UIControl *headerView = ... [headerView addTarget:self action:@selector(myEvent:) forControlEvents:UIControlEventTouchDown];
我的意思是从UIControl扩展headerView。
基于接受的答案，你可以定义一个macros：
#define handle_tap(view, delegate, selector) do {\ view.userInteractionEnabled = YES;\ [view addGestureRecognizer: [[UITapGestureRecognizer alloc] initWithTarget:delegate action:selector]];\ } while(0)
这个macros使用ARC，所以没有release调用。
macros用法示例：
handle_tap(userpic, self, @selector(onTapUserpic:));
您可以通过在您的代码中添加手势识别器来实现此目的。
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：这里你的View在我的情况是@property (strong, nonatomic) IBOutlet UIView *localView;
编辑： * localView是从下面Main.storyboard中的白色框
下面是一个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 } }
Swift 3更新
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))
这里是ios tapgesture; 首先，您需要在下面的代码中写下以下代码，然后为GestureRecognizer创build操作
- (IBAction)tapgesture:(id)sender { [_password resignFirstResponder]; [_username resignFirstResponder]; NSLog(@" TapGestureRecognizer tapped"); }
另一种方法是在视图中添加一个透明button
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 {}
创build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。
这样你将使用组合而不是子类（这是请求）。
Swift 3：
let tapGestureRecognizer: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleTapGestureRecognizer(_:))) view.addGestureRecognizer(tapGestureRecognizer) func handleTapGestureRecognizer(_ gestureRecognizer: UITapGestureRecognizer) { }
