我试图像下面这样快速获取 button
的 title
.
I tried to get the title
of a button
in swift like below.
@IBAction func buttonAction(_ sender: Any) {
let buttonTitle = sender.titleForState(.Normal)!
}
但它不起作用,甚至当我们在发送者之后按 .
时它没有给出任何 hint
.
but it didn't work,even it doesn't give any hint
when we press .
after the sender.
那么在 swift 3.0 中这样做的正确方法是什么
so what is the correct way of doing this in swift 3.0
否则,如果我们创建一个 IBOutlet
然后我们使用它的 currentTitle
,它可以正常工作,如下所示.为什么上面的 sender.
无法获取它
Or else if we create an IBOutlet
and then we use its currentTitle
, it works fine like below. Why we cannot get it with sender.
for above
@IBOutlet var thebutton: UIButton!
@IBAction func buttonAction(_ sender: Any) {
let buttonTitle = thebutton.currentTitle!
print(buttonTitle)
}
因为参数 sender 的类型是 Any
而不是 UIButton
.将方法签名更改为:
Because parameter sender is in type Any
instead of UIButton
. Change the method signature to:
@IBAction func buttonAction(_ sender: UIButton) {
if let buttonTitle = sender.title(for: .normal) {
print(buttonTitle)
}
}
你应该很高兴.
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