ios 如何为 UIBarButtonItem 设置标题？
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How do I set title for UIBarButtonItem?
提问by KSL
I'm a beginner iPhone developer.
我是初学者 iPhone 开发人员。
How can I programmatically set the title for the UIBarButtonItem?
如何以编程方式设置UIBarButtonItem?
My code is the following:
我的代码如下：
self.navigationItem.rightBarButtonItems =
UIBarButtonItem(
barButtonSystemItem: .Cancel, target: self,
action: "barButtonItemClicked:")
@IBAction func barButtonItemClicked(sender: UIBarButtonItem) {
//print something
}
回答by Kirsteins
Use different initialiser that allows you to specify the title:
使用不同的初始化程序，允许您指定标题：
UIBarButtonItem(title: "title", style: .Plain, target: self, action: "barButtonItemClicked:")
Swift 3.1 Update
斯威夫特 3.1 更新
UIBarButtonItem(title: "title", style: .plain, target: self, action: #selector(barButtonItemClicked))
回答by rvg
Swift 2 answer
斯威夫特 2 个回答
You could just add the following to viewDidLoad:
您可以将以下内容添加到viewDidLoad：
// Some text
self.barButtonItemClicked.title = "Right Button!"
OR
或者
// A Unicode Gear Symbol
// See: http://graphemica.com/%E2%9A%99
self.barButtonItemClicked.title = "\u{2699}"
The ViewController.Swiftcode below would set the name barButtonItemClickedyou used. I used a UIBarButtonItem to show how to set the title. But it is trivial to adapt it for a function.
ViewController.Swift下面的代码将设置barButtonItemClicked您使用的名称。我使用了 UIBarButtonItem 来展示如何设置标题。但是将它调整为一个函数是微不足道的。
import UIKit
class ViewController: UIViewController {
// Please make sure the line below is properly connected to your Storyboard!
@IBOutlet weak var barButtonItemClicked: UIBarButtonItem!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
// Set the text of the NavBarButtonItem Title
self.barButtonItemClicked.title = "Right Button!"
// Gear Icon
// self.barButtonItemClicked.title = "\u{2699}"
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
回答by Manu
In my case, I wanted to toggle between the Edit|Done.
However, I couldn't use the leftBarButtonItem because I already had another UIBarButtonItem.
就我而言，我想在 Edit|Done 之间切换。但是，我无法使用 leftBarButtonItem，因为我已经有了另一个UIBarButtonItem.
What I did is the following:
我所做的是以下内容：
1- Create @IBOutlet weak var edit: UIBarButtonItem!
1- 创建 @IBOutlet weak var edit: UIBarButtonItem!
2- Then a variable to hold the state: var isEditingMode = false
2-然后是一个保存状态的变量： var isEditingMode = false
3- Now in the viewDidLoad:
3- 现在在viewDidLoad：
override func viewDidLoad() {
…
self.edit.action = #selector(self.toogleEditor(_:))
self.edit.title = "Edit"
self.setEditing(isEditingMode, animated: true)
…
}
I initialize the edit.action Selector to my custom function toogleEditor. I want to be able to change the title whenever an action occur.
我将 edit.action Selector 初始化为我的自定义函数toogleEditor。我希望能够在发生操作时更改标题。
4- Create an IBAction:
4- 创建一个 IBAction：
@IBAction func toogleEditor(sender: AnyObject) {
if isEditingMode
{
isEditingMode = false
self.edit.title = "Edit"
}
else
{
isEditingMode = true
self.edit.title = "Done"
}
self.setEditing(isEditingMode, animated: true)
}
This function is triggered each time the user click the UIBarItemButton.
The only thing to do is use the setEditing(…)to change the behaviour of the UITableViewController.
每次用户单击 时都会触发此功能UIBarItemButton。唯一要做的就是使用setEditing(…)来改变 的行为UITableViewController。
回答by Joel
Swift 4:
斯威夫特 4：
@IBOutlet var saveButton: UIBarButtonItem!
saveButton.title = "Saved"
回答by RyanTCB
from the docs
从文档
init(title title: String?,
style style: UIBarButtonItemStyle,
target target: AnyObject?,
action action: Selector)
