如何更改一行中单个字母或一个单词的颜色

问题描述

如何在AlertView的消息"中更改单词的颜色

How to change color of word in "message" in AlertView

@@IBAction func btn_instructions(sender: UIButton) {
    let alertView = UNAlertView(title: "MyTitle", message: "Here green text, here red text")
 alertView.show()

很抱歉，如果问题不正确.

Sorry if question is not correct.

推荐答案

正如我在上面的评论中所写的，UIAlertView已被弃用，因此您必须改为使用UIAlertController.但是，您可以 使用(非敏捷)键值编码(由于UIAlertView是NSObject的子类)来设置消息的属性字符串:为键"attributedMessage".标题的关联键为"attributedTitle".

As I've written in my comment above, UIAlertView is deprecated, so you'll have to use UIAlertController instead. You can, however, set attributed strings for the message, using (non-swifty) key-value coding (since UIAlertView is a subclass of NSObject): setting an attributed string for key "attributedMessage". The associated key for the title is "attributedTitle".

但是，请注意，这些功能似乎-据我所知--未由Apple记录，仅由用户通过运行时自省.

Note, however, that these features seems---as far as I can find---undocumented by Apple, referenced only as derived by users via runtime introspection.

下面是一个示例:

import UIKit

class ViewController: UIViewController {

    // ...

    @IBAction func showAlert(sender: UIButton) {

        let alertController = UIAlertController(title: "Foo", message: "", preferredStyle: UIAlertControllerStyle.Alert)

        /* attributed string for alertController message */
        let attributedString = NSMutableAttributedString(string: "Bar Bar Bar!")

        attributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(),
            range: NSRange(location:0,length:3))
        attributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.greenColor(),
            range: NSRange(location:4,length:3))
        attributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.blueColor(),
            range: NSRange(location:8,length:3))

        alertController.setValue(attributedString, forKey: "attributedMessage")

        /* action: OK */
        alertController.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil))
        self.presentViewController(alertController, animated: true, completion: nil)
    }
}

产生以下结果:

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