Question

我想为我的标签制作动画，以便每秒一个接一个地出现。它好像用户正在阅读新单词出现。有谁知道怎么做，或者GitHub上有什么东西？

由于

Answer 1

正如@SeyyedParsaNeshaei所说，还有另一个answer给出了“选框”类型滚动，但是，如果你想要的（如你所说）一次只有一个词，请考虑下面的小草图，将在Playground中运行。它基本上设置了一个计时器，可以一次更改UILabel一个单词的文本。

import UIKit
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true

class MyVC: UIViewController {
    var tickTock: Int = 0
    var myString = ""
    var label: UILabel!
    // Following block only needed in Playground. 
    // Normally you would wire up the label in IB.
    { didSet { self.view.addSubview(self.label) } }

    override func viewDidLoad() {
        // This next line only necessary in Playground. 
        // Normally, the view would be set from the StoryBoard
        self.view = UIView(frame: CGRect(origin: .zero, size: CGSize(width: 100, height: 60)))
        super.viewDidLoad()
        // "1" in the next line is the inter-word interval in seconds.
        // Obviously you wouldn't hard-wire this.
        let _ = Timer.scheduledTimer(withTimeInterval: 1, repeats: true, block: { _ in
            let words = self.myString.components(separatedBy: " ")
            var word = "<Nothing>"
            if words.count > 0 {
                self.tickTock = self.tickTock % words.count
                if !words[self.tickTock].isEmpty {
                    word = words[self.tickTock]
                }
            }
            self.label?.text = word
            self.tickTock += 1
        })
    }
}
// Playground code to test:
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 100, height: 60))
label.textColor = .yellow
label.textAlignment = .center
let myVC = MyVC()
myVC.myString = "May the source be with you"
myVC.label = label

PlaygroundPage.current.liveView = myVC.view

要查看动画，请从Playground菜单中选择“View＆gt; Assistant Editor＆gt; Show Assistant Editor”。

要获得更全面的解决方案，您可能希望查看我使用的components(separatedBy: CharactersSet)而不是components(separatedBy: String) - 这取决于您想要如何呈现标点符号...

标签内的动画文字 - 新单词显示为阅读

1 个答案: