swift - 快速逐字显示文本

Question

快速 5 iOS 13

试图一个字一个字地慢慢打印出一个句子。起草了这个有效的代码，但我担心如果我输入太长的句子，我会因为太多线程而导致手机崩溃。

    let textFeed = "Some text message made up of words"
    var second = 1
    DispatchQueue.main.asyncAfter(deadline: .now() + 0.5, execute: {

      for word in textFeed.components(separatedBy: " ") {
        var delay = DispatchTimeInterval.seconds(second)
        DispatchQueue.main.asyncAfter(deadline: .now() + delay, execute: {
          self.infoText2.text = String(word)

          print("word",word,second)
        })
        second = second + 1
      }
    })

关于以不同的方式做这件事，减少线程的任何想法？

Answer 1

一个简单的 rekusive func

printMessage(message: "I am a test")

func printMessage(message: String?, delay: TimeInterval = 1) {
        let splits = message?.split(separator: " ", maxSplits: 1)
        print(splits?.first)
        DispatchQueue.main.asyncAfter(deadline: .now() + delay, execute: {[weak self] in
            guard splits?.count == 2 else {
                return
            }
            self?.printMessage(message: String(splits?.last ?? ""))
        })
    }