我不明白为什么以下按钮会引发错误:2014-08-13 00:29:57.674 view1[26581:842344] -[view1.ViewController buttonAction:]: unrecognized selector sent to instance 0x797731c0 2014-08-13 00:29:57.677 view1[26581:842344] * 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序,原因:“-[view1.ViewController buttonAction:]: 无法识别的选择器发送到实例 0x797731c0'。任何帮助表示赞赏。非常感谢
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
func buttonAction(sender:UIButton)
{
println("Button tapped")
}
let windowsize = CGRect(x: 0, y: 0, width: 320, height: 480)
let labelsize = CGRect(x: 0, y: 200, width: 140, height: 60)
let myButton = UIButton(frame: CGRectMake(0, 0, 100, 100))
let myView = UIView(frame: windowsize)
let viewwidth = myView.frame.width
let spaceleft = (viewwidth - labelsize.width)/2
myView.backgroundColor = UIColor .blackColor()
let myLabel = UILabel(frame:labelsize)
myLabel.frame.origin.x = spaceleft
myLabel.text = "Hello"
myLabel.font = UIFont(name: "Chalkduster", size: 22)
myLabel.textColor = UIColor .whiteColor()
myLabel.textAlignment = NSTextAlignment.Center
myLabel.backgroundColor = UIColor .redColor()
//myView.addSubview(myButton)
myView.addSubview(myLabel)
self.view.addSubview(myView)
let button = UIButton.buttonWithType(UIButtonType.System) as UIButton
button.frame = CGRectMake(100, 100, 100, 50)
button.backgroundColor = UIColor.greenColor()
button.setTitle("Test Button", forState: UIControlState.Normal)
button.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
myView.addSubview(button)
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
最佳答案
您的 buttonAction
目标嵌套在您的 viewDidLoad()
方法中。将它移到外面,它应该可以到达。
class ViewController: UIViewController {
func buttonAction(sender:UIButton)
{
println("Button tapped")
}
override func viewDidLoad() {
super.viewDidLoad()
// ...
let button = UIButton.buttonWithType(UIButtonType.System) as UIButton
// ...
button.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
myView.addSubview(button)
}
}
关于ios - Swift 无法识别的选择器发送到实例 - 我错过了什么?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25275694/