以编程方式快速更改UIButton的文本

Simple question here. I have a UIButton, currencySelector, and I want to programmatically change the text. Here's what I have:

简单的问题。我有一个UIButton, currencySelector，我想以编程方式改变文本。这就是我有:

currencySelector.text = "foobar"

Xcode gives me the error "Expected Declaration". What am I doing wrong, and how can I make the button's text change?

Xcode给出了错误的“预期声明”。我做错了什么?我如何更改按钮的文本?

7 个解决方案

#1

In Swift 3:

在斯威夫特3:

button.setTitle("Button Title",for: .normal)

Otherwise:

否则:

button.setTitle("Button Title", forState: UIControlState.Normal)

#2

Just a clarification for those new to Swift and iOS programming. Below line of code:

这只是对Swift和iOS编程的一个澄清。下面的代码:

button.setTitle("myTitle", forState: UIControlState.Normal)

only applies to IBOutlets, not IBActions.

只适用于iboutlet，而不适用ibaction。

So, if your app is using a button as a function to execute some code, say playing music, and you want to change the title from Play to Pause based on a toggle variable, you need to also create an IBOutlet for that button.

因此，如果您的应用程序使用一个按钮作为函数来执行一些代码，比如播放音乐，并且您想要根据toggle变量将标题从播放更改为暂停，您还需要为该按钮创建一个IBOutlet。

If you try to use button.setTitle against an IBAction you will get an error. Its obvious once you know it, but for the noobs (we all were) this is a helpful tip.

如果你尝试使用按钮。对IBAction进行setTitle会得到一个错误。一旦你知道了这一点，这是显而易见的，但对于noobs(我们都知道)来说，这是一个有用的建议。

#3

Swift 3:

斯威夫特3:

Set button title:

设置按钮标题:

//for normal state:
my_btn.setTitle("Button Title", for: .normal)

// For highlighted state:
my_btn.setTitle("Button Title2", for: .highlighted)

#4

Swift 3.0

斯威夫特3.0

// Standard State
myButton.setTitle("Title", for: .normal)

#5

Swift 4:

    for state: UIControlState in [.normal, .highlighted, .disabled, .selected, .focused, .application, .reserved] {
        button.setTitle(NSLocalizedString("Title", comment: ""), for: state)
    }

#6

Swift 3

斯威夫特3

When you make the @IBAction:

当您创建@IBAction时:

@IBAction func btnAction(_ sender: UIButton) {
  sender.setTitle("string goes here", for: .normal)
}

This sets the sender as UIButton (instead of Any) so it targets the btnAction as a UIButton

它将sender设置为UIButton(而不是Any)，因此它将btnAction设置为UIButton

#7

Swift 3

斯威夫特3

let button: UIButton = UIButton()
button.frame = CGRect.init(x: view.frame.width/2, y: view.frame.height/2, width: 100, height: 100)
button.setTitle(“Title Button”, for: .normal)