ios Swift3：使用代码添加按钮
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Swift3: Add button with code
提问by pRivaT3 BuG
Im reading Apples swift (iOS) documentation but its written for Swift 2 and i use Swift 3. I want to add a button programmatically but its seems there is a change and I can't find how to fix it.
我正在阅读 Apples swift (iOS) 文档，但它是为 Swift 2 编写的，我使用的是 Swift 3。我想以编程方式添加一个按钮，但它似乎发生了变化，我找不到如何修复它。
Here is the Code for the Swift 2 example:
这是 Swift 2 示例的代码：
import UIKit
class RatingControl: UIView {
// MARK: Initialization
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
// Buttons
let button = UIButton(frame: CGRect(x: 0, y: 0, width: 44, height: 44))
button.backgroundColor = UIColor.red()
button.addTarget(self, action: #selector(RatingControl.ratingButtonTapped(_:)), forControlEvents: .TouchDown)
addSubview(button)
}
override func intrinsicContentSize() -> CGSize {
return CGSize(width: 240, height: 44)
}
// MARK: Button Action
func ratingButtonTapped(button: UIButton){
print("Button pressed")
}
}
The only change i made after the 'fix-it' showed the error is this in the selector:
在“修复它”显示错误后我所做的唯一更改是选择器中的这个：
button.addTarget(self, action: #selector(RatingControl.ratingButtonTapped(button:)), for: .touchDown)
This should have printed "Button pressed" but it doesn't. Any help?
这应该打印“按下按钮”，但它没有。有什么帮助吗？
回答by V? ?ình Thu?n
My code:
我的代码：
button.backgroundColor = UIColor.red
button.addTarget(self, action: #selector(RatingControl.ratingButtonTapped(_:)), for: .touchDown)
override var intrinsicContentSize : CGSize {
//override func intrinsicContentSize() -> CGSize {
//...
return CGSize(width: 240, height: 44)
}
// MARK: Button Action
func ratingButtonTapped(_ button: UIButton) {
print("Button pressed ")
}
回答by axel
Try something like this. I haven't tested but it should work:
尝试这样的事情。我还没有测试过，但它应该可以工作：
let button = UIButton(frame: CGRect(x: 0, y: 0, width: 44, height: 44))
button.backgroundColor = UIColor.red
button.addTarget(self, action: #selector(ratingButtonTapped), for: .touchUpInside)
addSubview(button)
func ratingButtonTapped() {
print("Button pressed")
}
回答by pRivaT3 BuG
Found the solution. For some reason the:
找到了解决办法。出于某种原因：
func ratingButtonTapped(button: UIButton)
needs an "_" before button. So it should be :
按钮前需要一个“_”。所以应该是：
func ratingButtonTapped(_ button: UIButton)
And the other part of the code must be :
代码的另一部分必须是：
button.addTarget(self, action: #selector(RatingControl.ratingButtonTapped(_:)), for: .touchDown)
Thanks for helping :) Your method may be correct also but thats the one Apple wants it.
感谢您的帮助 :) 您的方法也可能是正确的，但这就是 Apple 想要的方法。
