Swift3 iOS - 如何使 UITapGestureRecognizer 触发功能
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/38829151/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Swift3 iOS - How to make UITapGestureRecognizer trigger function
提问by iSebbeYT
I am trying to add a UITapGestureto a UIButton so it will trigger a function when tapped. I am using Swift 3and is getting some error:
我正在尝试将 a 添加UITapGesture到 UIButton 以便在点击时触发一个功能。我正在使用Swift 3并且出现一些错误：
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[SwiftRunner.ViewController tapBlurButton]: unrecognized selector sent to instance 0x149e07610'
由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“-[SwiftRunner.ViewController tapBlurButton]：无法识别的选择器发送到实例 0x149e07610”
This is roughly what I have:
这大致是我所拥有的：
// Swift 3
import UIKit
class ViewController {
@IBOutlet weak var qsBlurButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
let tapGesture = UITapGestureRecognizer(target: self, action: Selector(("tapBlurButton")))
qsBlurButton.addGestureRecognizer(tapGesture)
}
func tapBlurButton(sender: UITapGestureRecognizer) {
print("Please Help!")
}
}
回答by Nirav D
From your code you are using swift 3.0 so change your selectorsyntax like this
从您的代码中，您使用的是 swift 3.0，因此请selector像这样更改您的语法
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.tapBlurButton(_:)))
and Your function like this
你的功能是这样的
func tapBlurButton(_ sender: UITapGestureRecognizer) {
print("Please Help!")
}
Edit:
编辑：
Not idea that you are using button with tap gesture, instead of that use inbuilt method addTargetfor button no need to create tap gesture for it like this
不知道您正在使用带有点击手势的按钮，而不是使用按钮的内置方法addTarget，无需像这样为其创建点击手势
qsBlurButton.addTarget(self, action: #selector(self.tapBlurButton(_:)), forControlEvents: .TouchUpInside)
func tapBlurButton(_ sender: UIButton) {
print("Please Help!")
}
回答by skymook
Swift 3
斯威夫特 3
In the case where the funcfor the selector looks like this (note: it doesn't have a _):
在funcfor 选择器看起来像这样的情况下（注意：它没有 _）：
func tapBlurButton(sender: UITapGestureRecognizer) {
print("Please Help!")
}
Then the selector looks like this:
然后选择器看起来像这样：
#selector(self.tapBlurButton(sender:))
So the final code for the selector is this:
所以选择器的最终代码是这样的：
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.tapBlurButton(sender:)))
If you do not specify that the first parameter has _, then you need to use the full name of the first parameter.
如果没有指定第一个参数有_，那么就需要使用第一个参数的全名。
回答by Pochi
To add a gesture recognizer you have to create one indicating which function it will call:
要添加手势识别器，您必须创建一个指示它将调用哪个函数的手势识别器：
let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(self.handleTapFrom(recognizer:)))
Then add it to the element you need. (You are using a button, and as others have explained buttons have their native 'addTarget' methods)
然后将其添加到您需要的元素中。（您正在使用按钮，并且正如其他人所解释的那样，按钮具有其原生的“addTarget”方法）
For explanation purposes imagine you want to add it to an UIView:
出于解释目的，假设您想将其添加到 UIView：
self.someView.addGestureRecognizer(tapGestureRecognizer)
And don't forget that some elements are "not user interactive" by default so you might have to change that property too:
并且不要忘记某些元素默认情况下是“非用户交互的”，因此您可能也必须更改该属性：
self.someView.isUserInteractionEnabled = true
In Swift 4the function needs the @objc declaration:
在Swift 4 中，该函数需要 @objc 声明：
@objc func handleTapFrom(recognizer : UITapGestureRecognizer)
{
// Some code...
}
