我如何添加一个触摸事件到一个UIView? 我试一试:
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:'
我不想创建一个子类然后重写
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
当前回答
斯威夫特3:
let tapGestureRecognizer: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleTapGestureRecognizer(_:)))
view.addGestureRecognizer(tapGestureRecognizer)
func handleTapGestureRecognizer(_ gestureRecognizer: UITapGestureRecognizer) {
}
其他回答
斯威夫特5.3
基于闭包的UIGestureRecognizer解决方案
final class BindableGestureRecognizer: UITapGestureRecognizer {
private var action: () -> Void
init(action: @escaping () -> Void) {
self.action = action
super.init(target: nil, action: nil)
self.addTarget(self, action: #selector(execute))
}
@objc private func execute() {
action()
}
}
public extension UIView {
/// A discrete gesture recognizer that interprets single or multiple taps.
/// - Parameters:
/// - tapNumber: The number of taps necessary for gesture recognition.
/// - closure: A selector that identifies the method implemented by the target to handle the gesture recognized by the receiver. The action selector must conform to the signature described in the class overview. NULL is not a valid value.
func addTapGesture(tapNumber: Int = 1, _ closure: (() -> Void)?) {
guard let closure = closure else { return }
let tap = BindableGestureRecognizer(action: closure)
tap.numberOfTapsRequired = tapNumber
addGestureRecognizer(tap)
isUserInteractionEnabled = true
}
}
使用:
view.addTapGesture { [weak self] in
self?.view.backgroundColor = .red
}
创建一个手势识别器(子类)，它将实现触摸事件，如touchesBegan。之后可以将其添加到视图中。
这样您将使用组合而不是子类化(这是请求)。
斯威夫特和斯威夫特
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
}
}
Use
yourView.addTapGesture(tapNumber: 1, target: self, action: #selector(yourMethod))
你们为什么不试试ssevenlistener呢?
您不需要创建任何手势识别器，并将您的逻辑分离到另一个方法。ssevenlistener支持在视图上设置侦听器块，以侦听单个点击手势，双击手势和N-tap手势，如果你喜欢，和长按手势。设置一个点击手势监听器是这样的:
[view ss_addTapViewEventListener:^(UITapGestureRecognizer *recognizer){…} numberOfTapsRequired: 1);
另一种方法是向视图添加一个透明按钮
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，handle click:
- (void)buttonClicked:(id)sender
{}
