ios - 学习 Swift 并尝试在标签中创建字符串循环

Question

在 Swift 中，我试图以 1-2 秒的间隔自动循环标签中的字符串数组。

例如，我在数组中有以下字符串:

RedBlueGreen

I want the label to scroll through these.

For a better idea, here is what I currently have;

import UIKit

class ViewController: UIViewController {

    @IBOutlet var Label: UILabel!

    @IBOutlet var Label2: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    @IBAction func RandomWord() {
        var RandomWord = arc4random_uniform(5)
        switch (RandomWord) {
        case 0:
            Label.text = "Blue"
            if Label.text == "Blue" {
                Label.textColor = UIColor.blueColor()
            }
            break;
        case 1:
            Label.text = "Red"
            if Label.text == "Red" {
                Label.textColor = UIColor.redColor()
            }
            break;
        case 2:
            Label.text = "Green"
            if Label.text == "Green" {
                Label.textColor = UIColor.greenColor()
            }
            break;
        case 3:
            Label.text = "Yellow"
            if Label.text == "Yellow" {
                Label.textColor = UIColor.yellowColor()
            }
            break;
        case 4:
            Label.text = "Orange"
            if Label.text == "Orange" {
                Label.textColor = UIColor.orangeColor()
            }
            break;
        default:
            break;

        }
    }

    @IBAction func RandomNumber() {
        var RandomNumber = arc4random_uniform(100)
        Label2.text = String(RandomNumber)
    }

}

我想删除对按钮的需要，只让标签循环遍历字符串。关于最佳解决方案的任何想法？

Answer 1

这种文本滚动/爬行功能不会自动内置到 UILabel 中。您可以自己实现它(这不是最微不足道的事情)，或者您可以利用其他人在某个开源项目中所做的工作。

例如，我刚刚找到MarqueeLabel它确实有一个 Swift implementation you can use .

尝试将其添加到您的项目中，看看它是否满足您的需求。