我正在尝试使用UILabel创建打字机动画效果,但找不到任何答案。UILabel是正确使用的对象吗?我希望文本将字符串数组打印到屏幕上,例如“登录…正在打开文件夹…正在重新启动系统..”等。我应该提一下,我是编码的新手,并且尝试过搜索文档和API参考,但没有运气。如果值得一提,我目前正在学习SWIFT
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. } }