ios 以编程方式快速更改 UIButton 的文本
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Changing text of UIButton programmatically swift
提问by rocket101
Simple question here. I have a UIButton, currencySelector, and I want to programmatically change the text. Here's what I have:
简单的问题在这里。我有一个 UIButton、currencySelector，我想以编程方式更改文本。这是我所拥有的：
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 给了我错误“预期声明”。我做错了什么，如何更改按钮的文本？
回答by Gal Marom
In Swift 3, 4, 5:
在 Swift 3、4、5 中：
button.setTitle("Button Title", for: .normal)
Otherwise:
除此以外：
button.setTitle("Button Title", forState: UIControlState.Normal)
Also an @IBOutlethas to declared for the button.
还@IBOutlet必须为button.
回答by Bendrix
Just a clarification for those new to Swiftand iOSprogramming. Below line of code:
只是对Swift和iOS编程的新手的澄清。下面的代码行：
button.setTitle("myTitle", forState: UIControlState.Normal)
only applies to IBOutlets, not IBActions.
仅适用于IBOutlets，不适用于IBActions。
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 Playto Pausebased on a toggle variable, you need to also create an IBOutletfor that button.
所以，如果您的应用使用一个按钮的功能，以执行一些代码，说播放音乐，并希望标题从改变Play到Pause基于一个切换变量，您还需要创建一个IBOutlet该按钮。
If you try to use button.setTitleagainst an IBActionyou will get an error. Its obvious once you know it, but for the noobs (we all were) this is a helpful tip.
如果您尝试button.setTitle对 an使用，IBAction则会出现错误。一旦你知道它就很明显了，但对于新手（我们都是）这是一个有用的提示。
回答by Dmitry
Swift 5:
斯威夫特 5：
let controlStates: Array<UIControl.State> = [.normal, .highlighted, .disabled, .selected, .focused, .application, .reserved]
for controlState in controlStates {
button.setTitle(NSLocalizedString("Title", comment: ""), for: controlState)
}
回答by Bhavin Ramani
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)
回答by Tyler Rutt
Swift 5.0
斯威夫特 5.0
// Standard State
myButton.setTitle("Title", for: .normal)
回答by Christian Navelot
Changing title when attributed is a bit different :
归因时更改标题有点不同：
I just ran into a problem : If you have an UIButton with an Attributed Title, you have to use :
我刚遇到一个问题：如果你有一个带有属性标题的 UIButton，你必须使用：
my_btn.setAttributedTitle(NSAttributedString(string: my_title), for: my_state)
as, per Apple SetTitle Doc:
If you set both a title and an attributed title for the button, the button prefers the use of the attributed title over this one.
如果您为按钮设置了标题和属性标题，则按钮更喜欢使用属性标题而不是这个标题。
I had an attributed title and I tried to setTitle on it, with no effect...
我有一个属性标题，我试图在它上面设置标题，但没有效果......
回答by gustavoanalytics
Swift 3
斯威夫特 3
When you make the @IBAction:
当你做@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
这将发送者设置为 UIButton（而不是 Any），因此它将 btnAction 定位为 UIButton
回答by midhun p
swift 4.2 and above
swift 4.2 及以上
using button's IBOutlet
使用按钮的 IBOutlet
btnOutlet.setTitle("New Title", for: .normal)
using button's IBAction
使用按钮的 IBAction
@IBAction func btnAction(_ sender: UIButton) {
sender.setTitle("New Title", for: .normal)
}
回答by Jasani Hardik
To set a title for a button in Xcode using swift - 04: first create a method called setTitle with parameter title and UIController state like below ;
要使用 swift - 04 在 Xcode 中为按钮设置标题：首先创建一个名为 setTitle 的方法，其参数标题和 UIController 状态如下所示；
func setTitle(_ title : String?, for state : UIControl.State) {
}
and recall this method in your button action method like ;
并在您的按钮操作方法中调用此方法，例如；
yourButtonName.setTitle("String", for: .state)
回答by Giang
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)
