使用 swift IOS 使 UIBarButtonItem 消失

Make a UIBarButtonItem disappear using swift IOS(使用 swift IOS 使 UIBarButtonItem 消失)

问题描述

我有一个从故事板链接到的 IBOutlet

I have an IBOutlet that I have linked to from the storyboard

@IBOutlet var creeLigueBouton: UIBarButtonItem!

如果条件为真，我想让它消失

and I want to make it disappear if a condition is true

if(condition == true)
{
    // Make it disappear
}

推荐答案

你真的要隐藏/显示 creeLigueBouton 吗?相反，启用/禁用 UIBarButtonItems 要容易得多.你可以用几行代码来做到这一点:

Do you really want to hide/show creeLigueBouton? It is instead much easier to enable/disable your UIBarButtonItems. You would do this with a few lines:

if(condition == true) {
    creeLigueBouton.enabled = false
} else {
    creeLigueBouton.enabled = true
}

这段代码甚至可以用更短的方式重写:

This code can even be rewritten in a shorter way:

creeLigueBouton.enabled = !creeLigueBouton.enabled

让我们在 UIViewController 子类中查看它:

Let's see it in a UIViewController subclass:

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var creeLigueBouton: UIBarButtonItem!

    @IBAction func hide(sender: AnyObject) {
        creeLigueBouton.enabled = !creeLigueBouton.enabled
    }

}

<小时>

如果你真的想显示/隐藏creeLigueBouton，你可以使用下面的代码:

If you really want to show/hide creeLigueBouton, you can use the following code:

import UIKit

class ViewController: UIViewController {

    var condition: Bool = true
    var creeLigueBouton: UIBarButtonItem! //Don't create an IBOutlet

    @IBAction func hide(sender: AnyObject) {
        if(condition == true) {
            navigationItem.rightBarButtonItems = []
            condition = false
        } else {
            navigationItem.rightBarButtonItems = [creeLigueBouton]
            condition = true
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        creeLigueBouton = UIBarButtonItem(title: "Creer", style: UIBarButtonItemStyle.Plain, target: self, action: "creerButtonMethod")
        navigationItem.rightBarButtonItems = [creeLigueBouton]
    }

    func creerButtonMethod() {
        print("Bonjour")
    }

}

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