如何访问和更改由 UIButton 组成的自定义 barButtonItem 的 NSAttributedString 标题？

Question

我在工具栏中创建了一个自定义 barButtonItem。我想在点击 barButtonItem 时更改 NSAttributedString 的字符串。但是正如苹果文档所说，该功能的性能由customView负责，不再是barButtonItem，我如何根据事件访问并更改它的细节？

    let button1 = UIButton(type: .System)
    button1.sizeToFit()
    let attributes1 = [NSForegroundColorAttributeName: UIColor.grayColor(), NSFontAttributeName: UIFont.systemFontOfSize(13)]
    let attributedString1 = NSAttributedString(string: "Hello", attributes: attributes1)
    button1.setAttributedTitle(attributedString1, forState: .Normal)
    button1.addTarget(self, action: #selector(ActionViewController.switchAccounts), forControlEvents: .TouchUpInside)
    let account = UIBarButtonItem(customView: button1)

    setToolbarItems([account], animated: true)

我是新手。 OC我也可以看。欢迎任何建议。谢谢

Answer 1

有没有人发现Whosebug可以当小黄鸭用？哈哈

for item in toolbarItems! where item.tag == 1000 {
        let attributes1 = [NSForegroundColorAttributeName: UIColor.grayColor(), NSFontAttributeName: UIFont.systemFontOfSize(13)]
        let attributedString1 = NSAttributedString(string: "world!", attributes: attributes1)

        let button = item.customView as! UIButton
        button.setAttributedTitle(attributedString1, forState: .Normal)
        button.sizeToFit()
    }

Answer 2

您可以像这样使用自定义按钮操作方法

func switchAccounts(sender : UIButton)  {
    let attributes1 = [NSForegroundColorAttributeName: UIColor.grayColor(), NSFontAttributeName: UIFont.systemFontOfSize(13)]
    let attributedString1 = NSAttributedString(string: "world!", attributes: attributes1)

    sender.setAttributedTitle(attributedString1, forState: .Normal)
    sender.sizeToFit()
}

和

button1.addTarget(self, action: #selector(ActionViewController.switchAccounts(_:))

而不是

button1.addTarget(self, action: #selector(ActionViewController.switchAccounts)

Answer 3

更改目标代码如下。

button1.addTarget(self, action: #selector(ActionViewController.switchAccounts(_:)), forControlEvents: .TouchUpInside)

使 switchAccounts() 如下所示。

func switchAccounts(sender:UIButton){
    sender.selected = !sender.selected
    let attributes1 = [NSForegroundColorAttributeName: UIColor.redColor(), NSFontAttributeName: UIFont.systemFontOfSize(13)]
    let attributedString1 = NSAttributedString(string: "Hello click", attributes: attributes1)
    sender.setAttributedTitle(attributedString1, forState: .Selected)
}

如何访问和更改由 UIButton 组成的自定义 barButtonItem 的 NSAttributedString 标题？

How to access and change the NSAttributedString title of a custom barButtonItem composed by UIButton?

uibutton

uibarbuttonitem

ios

swift