您可以将 UITapGestureRecognizer
实例添加到您的 UILabel。
例如:
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(labelTapped)];
tapGestureRecognizer.numberOfTapsRequired = 1;
[myLabel addGestureRecognizer:tapGestureRecognizer];
myLabel.userInteractionEnabled = YES;
如果您使用情节提要,您可以在情节提要中完成整个过程,而无需额外的代码。向情节提要添加标签,然后向标签添加点击手势。在“实用程序”窗格中,确保为标签选中“已启用用户交互”。从点击手势(在情节提要中视图控制器的底部),ctrl+单击并拖动到您的 ViewController.h 文件并创建一个动作。然后在 ViewController.m 文件中实现动作。
斯威夫特 3.0
初始化 tempLabel
的手势
tempLabel?.text = "Label"
let tapAction = UITapGestureRecognizer(target: self, action: #selector(self.actionTapped(_:)))
tempLabel?.isUserInteractionEnabled = true
tempLabel?.addGestureRecognizer(tapAction)
动作接收器
func actionTapped(_ sender: UITapGestureRecognizer) {
// code here
}
斯威夫特 4.0
初始化 tempLabel
的手势
tempLabel?.text = "Label"
let tapAction = UITapGestureRecognizer(target: self, action:@selector(actionTapped(_:)))
tempLabel?.isUserInteractionEnabled = true
tempLabel?.addGestureRecognizer(tapAction)
动作接收器
func actionTapped(_ sender: UITapGestureRecognizer) {
// code here
}
斯威夫特 2.0:
我正在添加一个 nsmutable 字符串作为 sampleLabel 的文本,启用用户交互,添加一个点击手势并触发一个方法。
override func viewDidLoad() {
super.viewDidLoad()
let newsString: NSMutableAttributedString = NSMutableAttributedString(string: "Tap here to read the latest Football News.")
newsString.addAttributes([NSUnderlineStyleAttributeName: NSUnderlineStyle.StyleDouble.rawValue], range: NSMakeRange(4, 4))
sampleLabel.attributedText = newsString.copy() as? NSAttributedString
let tapGesture: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "tapResponse:")
tapGesture.numberOfTapsRequired = 1
sampleLabel.userInteractionEnabled = true
sampleLabel.addGestureRecognizer(tapGesture)
}
func tapResponse(recognizer: UITapGestureRecognizer) {
print("tap")
}
您可以改用 UIButton 并将文本设置为您想要的。如果您不想,按钮不必看起来像按钮
在 UILable 上添加 Tap 手势
UITapGestureRecognizer *tapAction = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(lblClick:)];
tapAction.delegate =self;
tapAction.numberOfTapsRequired = 1;
//Enable the lable UserIntraction
lblAction.userInteractionEnabled = YES;
[lblAction addGestureRecognizer:tapAction];
并评估选择器方法
- (void)lblClick:(UITapGestureRecognizer *)tapGesture {
}
注意:在 .h 文件中添加 UIGestureRecognizerDelegate
Swift 版本: var tapGesture : UITapGestureRecognizer = UITapGestureRecognizer()
然后在 viewDidLoad()
中添加:
let yourLbl=UILabel(frame: CGRectMake(x,y,width,height)) as UILabel!
yourLbl.text = "SignUp"
tapGesture.numberOfTapsRequired = 1
yourLbl.addGestureRecognizer(tapGesture)
yourLbl.userInteractionEnabled = true
tapGesture.addTarget(self, action: "yourLblTapped:")
如果您想在按钮中使用多行文本,则使用多行文本创建一个 UILabel
,并将其作为子视图添加到您的按钮中。
例如:
yourLabel=[Uilabel alloc]init];
yourLabel.frame=yourButtom.Frame;//(frame size should be equal to your button's frame)
[yourButton addSubView:yourLabel]
来自阿尔文乔治的 Swift 3
override func viewDidLoad() {
super.viewDidLoad()
let newsString: NSMutableAttributedString = NSMutableAttributedString(string: "Tap here to read the latest Football News.")
newsString.addAttributes([NSUnderlineStyleAttributeName: NSUnderlineStyle.styleDouble.rawValue], range: NSMakeRange(4, 4))
sampleLabel.attributedText = newsString.copy() as? NSAttributedString
let tapGesture: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(ViewController.tapResponse))
tapGesture.numberOfTapsRequired = 1
sampleLabel.isUserInteractionEnabled = true
sampleLabel.addGestureRecognizer(tapGesture)
}
func tapResponse(recognizer: UITapGestureRecognizer) {
print("tap")
}
这在 Xcode 12 和 Swift 5 中效果很好
let tapAction = UITapGestureRecognizer(target: self,action:#selector(actionTapped(_:)))
userLabel?.isUserInteractionEnabled = true
userLabel?.addGestureRecognizer(tapAction)
以及动作方法,例如-
@objc func actionTapped(_ sender: UITapGestureRecognizer) {
print("tapped")
}
Swift 版本如下所示:
func addGestureRecognizerLabel(){
//Create a instance, in this case I used UITapGestureRecognizer,
//in the docs you can see all kinds of gestures
let gestureRecognizer = UITapGestureRecognizer()
//Gesture configuration
gestureRecognizer.numberOfTapsRequired = 1
gestureRecognizer.numberOfTouchesRequired = 1
/*Add the target (You can use UITapGestureRecognizer's init() for this)
This method receives two arguments, a target(in this case is my ViewController)
and the callback, or function that you want to invoke when the user tap it view)*/
gestureRecognizer.addTarget(self, action: "showDatePicker")
//Add this gesture to your view, and "turn on" user interaction
dateLabel.addGestureRecognizer(gestureRecognizer)
dateLabel.userInteractionEnabled = true
}
//How you can see, this function is my "callback"
func showDatePicker(){
//Your code here
print("Hi, was clicked")
}
//To end just invoke to addGestureRecognizerLabel() when
//your viewDidLoad() method is called
override func viewDidLoad() {
super.viewDidLoad()
addGestureRecognizerLabel()
}
我个人更喜欢为 UILabel 编写扩展的方法。这就是我使用的。
import UIKit
extension UILabel {
/**
* A map of actions, mapped as [ instanceIdentifier : action ].
*/
private static var _tapHandlers = [String:(()->Void)]()
/**
* Retrieve the address for this UILabel as a String.
*/
private func getAddressAsString() -> String {
let addr = Unmanaged.passUnretained(self).toOpaque()
return "\(addr)"
}
/**
* Set the on tapped event for the label
*/
func setOnTapped(_ handler: @escaping (()->Void)) {
UILabel._tapHandlers[getAddressAsString()] = handler
let gr = UITapGestureRecognizer(target: self, action: #selector(onTapped))
gr.numberOfTapsRequired = 1
self.addGestureRecognizer(gr)
self.isUserInteractionEnabled = true
}
/**
* Handle the tap event.
*/
@objc private func onTapped() {
UILabel._tapHandlers[self.getAddressAsString()]?()
}
}
然后,您将在任何 UILabel 实例中像这样使用它:
myLabel.setOnTapped {
// do something
}
我相信这可能会导致一些内存泄漏,但我还没有确定如何最好地解决它们。
不定期副业成功案例分享