如何修复:类型 'String' 不符合 Swift 中的协议 'SequenceType'

How to fix: Type 'String' does not conform to protocol 'SequenceType' in Swift

我在 Swift 中有一个简单的标签文本动画。 我收到以下错误:

Type 'String' does not conform to protocol 'SequenceType'

下面是我的一些代码:

LabelTextAnimation.swift:

import UIKit

func setTextWithTypeAnimation(inputText: String, interval: NSTimeInterval, label: UILabel) {

    label.text = ""

    dispatch_async(dispatch_get_global_queue(QOS_CLASS_USER_INTERACTIVE, 0)) {

        for character in inputText {  // 1

            dispatch_async(dispatch_get_main_queue()) {

                label.text = label.text! + String(character)

            }

            NSThread.sleepForTimeInterval(interval)

        }

    }

}

ViewController.swift:

import UIKit

class ViewController: UIViewController {

    @IBOutlet var label: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        setTextWithTypeAnimation("This is very cool", interval: 0.13, label: label)

    }

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


}

// 1 是字符串错误的行:inputText.

还有,你知道让每个字符有不同颜色的方法吗?

希望你能帮助我! 提前致谢!

你应该做

而不是 for character in inputText {}

for character in inputText.characters {}