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Swift 发布时间：2022-04-30 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了swift – 将NSAttributedString添加到UIBarButtonItem，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

我正在尝试在后栏按钮项目上设置属性字符串.
这是我第一次尝试归因于字符串.
这是代码：

self.navigationItem.hidesBACkButton = true
    let barButtonBACkStr = "< BACk"
    var attributedBarButtonBACkStr = NSMutableAttributedString(String: barButtonBACkStr as String)
    attributedBarButtonBACkStr.addAttribute(NSFontAttributename,value: UIFont(
            name: "AmericanTypewriter-Bold",size: 18.0)!,range: NSRange(
            LOCATIOn:0,length:1))
    let newBACkButton = UIBarButtonItem(title: attributedBarButtonBACkStr,style: UIBarButtonItemStyle.Plain,target: self,action: "barButtonBACk:")
    self.navigationItem.leftBarButtonItem = newBACkButton

这导致Xcode中出现以下错误.

任何人都知道如何做到这一点？谢谢.

解决方法

您无法直接将属性字符串设置为UIBarButtonItem.您必须为其标题设置一个普通字符串,然后设置标题的属性：

let barButtonBACkStr = "< BACk"
let attributes: [String: AnyObject] = [NSFontAttributename: UIFont(name: "AmericanTypewriter-Bold",size: 18)!]
let newBACkButton = UIBarButtonItem(title: barButtonBACkStr,action: "barButtonBACk:")
newBACkButton.settitleTextAttributes(attributes,forState: .Normal)
navigationItem.leftBarButtonItem = newBACkButton

这种方法有一点需要注意：您无法为属性设置范围.这是全有或全无.

要为必须创建UILabel的属性定义范围,请将属性字符串设置为其attributiontext属性,然后使用自定义视图创建UIBarButtonItem：

let barButtonBACkStr = "< BACk"
let attributedBarButtonBACkStr = NSMutableAttributedString(String: barButtonBACkStr as String)
attributedBarButtonBACkStr.addAttribute(NSFontAttributename,value: UIFont(
        name: "AmericanTypewriter-Bold",range: NSRange(
        LOCATIOn:0,length:1))
let label = UILabel()
label.attributedText = attributedBarButtonBACkStr
label.sizeToFit()
let newBACkButton = UIBarButtonItem(customView: label)
self.navigationItem.leftBarButtonItem = newBACkButton