我有一个UIView并且我添加了点击手势
let tap = UITapGestureRecognizer(target: self, action: Selector("handleTap:"))
tap.delegate = self
myView.addGesture(tap)
我试图在testfile中以编程方式调用它。
sendActionForEvent
我正在使用这个函数，但它不起作用:
myView.sendActionForEvent(UIEvents.touchUpDown)
它显示未识别的选择器发送到实例。
我该如何解决这个问题呢?
当前回答
斯威夫特4
let tap = UITapGestureRecognizer(target: self, action: #selector(self.touchTapped(_:)))
self.view.addGestureRecognizer(tap)
@objc func touchTapped(_ sender: UITapGestureRecognizer) {
}
其他回答
试试下面的swift代码(在Xcode 6.3.1中测试):
import UIKit
class KEUITapGesture150427 : UIViewController {
var _myTap: UITapGestureRecognizer?
var _myView: UIView?
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.whiteColor();
_myTap = UITapGestureRecognizer(target: self
, action: Selector("_myHandleTap:"))
_myTap!.numberOfTapsRequired = 1
_myView = UIView(frame: CGRectMake(100, 200, 100, 100))
_myView!.backgroundColor=UIColor.blueColor()
_myView!.layer.cornerRadius = 20
_myView!.layer.borderWidth = 1
_myView!.addGestureRecognizer(_myTap!)
view.addSubview(_myView!)
}
func _myHandleTap(sender: UITapGestureRecognizer) {
if sender.state == .Ended {
println("_myHandleTap(sender.state == .Ended)")
sender.view!.backgroundColor
= UIColor(red: CGFloat(drand48()), green: CGFloat(drand48()), blue: CGFloat(drand48()), alpha: 1.0);
}
}
}
注意，你的目标可以是UIResponder的任何子类，参见(在Xcode 6.3.1中测试):
import UIKit
class MyTapTarget : UIResponder {
func _myHandleTap2(sender: UITapGestureRecognizer) {
if sender.state == .Ended {
println("_myHandleTap2(sender.state == .Ended)")
sender.view!.backgroundColor
= UIColor(red: CGFloat(drand48()), green: CGFloat(drand48()), blue: CGFloat(drand48()), alpha: 1.0);
}
}
}
class KEUITapGesture150427b : UIViewController {
var _myTap: UITapGestureRecognizer?
var _myView: UIView?
var _myTapTarget: MyTapTarget?
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.whiteColor();
_myTapTarget = MyTapTarget()
_myTap = UITapGestureRecognizer(target: _myTapTarget!
, action: Selector("_myHandleTap2:"))
_myTap!.numberOfTapsRequired = 1
_myView = UIView(frame: CGRectMake(100, 200, 100, 100))
_myView!.backgroundColor=UIColor.blueColor()
_myView!.layer.cornerRadius = 20
_myView!.layer.borderWidth = 1
_myView!.addGestureRecognizer(_myTap!)
view.addSubview(_myView!)
}
}
试试下面的扩展
extension UIView {
func addTapGesture(action : @escaping ()->Void ){
let tap = MyTapGestureRecognizer(target: self , action: #selector(self.handleTap(_:)))
tap.action = action
tap.numberOfTapsRequired = 1
self.addGestureRecognizer(tap)
self.isUserInteractionEnabled = true
}
@objc func handleTap(_ sender: MyTapGestureRecognizer) {
sender.action!()
}
}
class MyTapGestureRecognizer: UITapGestureRecognizer {
var action : (()->Void)? = nil
}
然后使用它:
submitBtn.addTapGesture {
//your code
}
你甚至可以把它用于cell
cell.addTapGesture {
//your code
}
你需要用目标和动作初始化UITapGestureRecognizer，如下所示:
let tap = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
myView.addGestureRecognizer(tap)
然后，你应该实现处理程序，它将在每次tap事件发生时被调用:
@objc func handleTap(_ sender: UITapGestureRecognizer? = nil) {
// handling code
}
所以现在调用你的点击手势识别器事件处理程序就像调用一个方法一样简单:
handleTap()
斯威夫特4
let tap = UITapGestureRecognizer(target: self, action: #selector(self.touchTapped(_:)))
self.view.addGestureRecognizer(tap)
@objc func touchTapped(_ sender: UITapGestureRecognizer) {
}
如果你想要Objective - C代码，如下所示，
UITapGestureRecognizer *gesRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)]; // Declare the Gesture.
gesRecognizer.delegate = self;
[yourView addGestureRecognizer:gesRecognizer]; // Add Gesture to your view.
// Declare the Gesture Recognizer handler method.
- (void)handleTap:(UITapGestureRecognizer *)gestureRecognizer{
NSLog(@"Tapped");
}
或者你想要swift代码如下所示，
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var myView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
// Add tap gesture recognizer to view
let tapGesture = UITapGestureRecognizer(target: self, action: Selector("handleTap:"))
myView.addGestureRecognizer(tapGesture)
}
// this method is called when a tap is recognized
func handleTap(sender: UITapGestureRecognizer) {
print("tap")
}
}
