打字机效果文字动画 [英] Typewriter effect text animation

问题描述

我正在尝试使用UILabel创建打字机动画效果，但无法找到任何答案。 UILabel是否是正确的使用对象？我希望文本在屏幕上打印一个字符串数组，例如登录...打开文件夹...重新启动系统......等等。我应该提一下，我是编码的新手，我试过搜索文档和API参考，但没有运气。我正在学习SWIFT，如果那值得一提

I'm trying to create a typewriter animation effect with a UILabel, but can't find any answers. Is the UILabel the correct object to use? I want the text to print to the screen an array of strings like, "Logging in... Opening Folder... Rebooting system.." etc. I should mention that I'm new to coding and I've tried searching the Documentation and API reference but no luck. I'm currently learning SWIFT if thats worth mentioning

推荐答案

更新： Xcode 7.0 GM•Swift 2.0

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var myTypeWriter: UITextField!
    let myText = Array("Hello World !!!".characters)
    var myCounter = 0
    var timer:NSTimer?
    func fireTimer(){
        timer = NSTimer.scheduledTimerWithTimeInterval(0.5, target: self, selector: "typeLetter", userInfo: nil, repeats: true)
    }
    func typeLetter(){
        if myCounter < myText.count {
            myTypeWriter.text = myTypeWriter.text! + String(myText[myCounter])
            let randomInterval = Double((arc4random_uniform(8)+1))/20
            timer?.invalidate()
            timer = NSTimer.scheduledTimerWithTimeInterval(randomInterval, target: self, selector: "typeLetter", userInfo: nil, repeats: false)
        } else {
            timer?.invalidate()
        }
        myCounter++
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        fireTimer()
        // 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.
    }
}

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