如何在未按下按钮时调用按钮功能

Question

我有一个IBAction连接到一个按钮,我想知道是否有任何方法来运行该功能,即使没有按下按钮.这就是我试过的......

注意:我在这个项目中使用swift.

//I get an error when I type this code?
self.buttonPressed()

@IBAction func buttonPressed(sender: AnyObject) {

    print("Called Action")

}

Answer 1

使您的sender参数可选,并将nil传递给ButtonPressed.

self.ButtonPressed( nil )


@IBAction func ButtonPressed( sender: AnyObject? ) {
    println("Called Action")
}

Answer 2

一种方法是将按钮链接到其各自的界面构建器按钮,并在调用它时将其传递给您的功能.

@IBOutlet weak var yourButton: UIButton!

// When you call method
self.buttonPressed(yourButton)

//function must begin with small letter as per iOs naming convention
@IBAction func buttonPressed(sender: AnyObject) {
    //println("Called Action"). This method has been renamed to print() in Swift 2.0
    print("Called Action")
}

或者,像这样定义你的函数,然后你就可以像以前一样调用你的方法:

@IBAction func buttonPressed(sender: AnyObject? = nil) {
    print("Called Action")
}

//Call your method like this
self.buttonPressed()