致命錯誤：無法增加endIndex的

fatal error: can not increment endIndex

在行myRange。爲什麼我得到這個錯誤？我不明白我的代碼有什麼問題。

import UIKit 

class ViewController: UIViewController { 

@IBOutlet var drag: UIPanGestureRecognizer! 
@IBOutlet weak var currentLabel: UILabel! 
@IBOutlet weak var label1: UILabel! 
@IBOutlet weak var label2: UILabel! 
@IBOutlet weak var label3: UILabel! 
@IBOutlet weak var label4: UILabel! 
@IBOutlet weak var label5: UILabel! 
@IBOutlet weak var label6: UILabel! 
@IBOutlet weak var label7: UILabel! 
@IBOutlet weak var label8: UILabel! 
@IBOutlet weak var label9: UILabel! 

let letter = "OX" 
var currentLetter = Character!() 
var decide = 0 
var labelArray = [UILabel]() 
var moveCounter = 0 
override func viewDidLoad() { 
    super.viewDidLoad() 
    getCurrentLetter() 
    labelArray = [label1,label2,label3,label4,label5,label6,label7,label8,label9] 
} 

func getCurrentLetter() 
{ 
    let myRange = Range<String.Index>(start: letter.startIndex.advancedBy(decide), end: letter.startIndex.advancedBy(decide+1)) 
    currentLabel.text = letter.substringWithRange(myRange) 
    currentLetter = Character(letter.substringWithRange(myRange)) 
} 

func reset() { 
    decide = 0 
} 
@IBAction func dragObject(sender: UIPanGestureRecognizer) { 
    let points = sender.locationInView(view) 
    let currentPoints = currentLabel.frame.origin 
    currentLabel.center = CGPointMake(points.x, points.y) 
    for item in labelArray { 
     if CGRectContainsPoint(item.frame, points) { 
      item.text = String(currentLetter) 
      decide++ 
      drag.enabled = false 
      currentLabel.center = currentPoints 
     } else if drag.enabled == false { 
      decide++ 
      drag.enabled = true 
      currentLabel.center = currentPoints 
     } 
     if decide == 2 { 
      reset() 
     } 
     getCurrentLetter() 
     } 
    } 
}

來源

2016-02-16 123558

的[裁剪結束掉在運行時迅速，得到錯誤串的]（http://stackoverflow.com/questions/29277746/可能的複製置換

let myRange = Range<String.Index>(start: letter.startIndex.advancedBy(decide), end: letter.startIndex.advancedBy(decide+1)) currentLabel.text = letter.substringWithRange(myRange) currentLetter = Character(letter.substringWithRange(myRange))

修剪結束字符串在迅速得到錯誤在運行時） – thislooksfun

我不明白如何應用代碼從「修剪結束字符串在swift，在運行時得到錯誤」我的代碼 – 123558

你是對的，對不起。我太快地回答了這個問題。現在發佈實際答案。 – thislooksfun

你的問題是，無論是decide或decide+1長於字符串。值得慶幸的是，有一些內置代碼可以解決這個問題。

嘗試用

let end = letter.endIndex.advancedBy(-1, limit: letter.startIndex) //The -1 is actually required, as the 'limit:' bit does <=, not just < 
let pos = letter.startIndex.advancedBy(decide, limit: end) 
currentLetter = letter[pos] 
currentLabel.text = currentLetter

來源

2016-02-16 06:07:04 thislooksfun

致命錯誤：無法增加endIndex的

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