致命错误：无法增加endIndex的

fatal error: can not increment endIndex

在行myRange。为什么我得到这个错误？我不明白我的代码有什么问题。

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() 
     } 
    } 
}

来源

2016-02-16 123558

的[裁剪结束掉在运行时迅速，得到错误串的]（http://stackoverflow.com/questions/29277746/可能的复制置换

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))

修剪结束字符串在迅速得到错误在运行时） – thislooksfun

我不明白如何应用代码从“修剪结束字符串在swift，在运行时得到错误”我的代码 – 123558

你是对的，对不起。我太快地回答了这个问题。现在发布实际答案。 – thislooksfun

你的问题是，无论是decide或decide+1长于字符串。值得庆幸的是，有一些内置代码可以解决这个问题。

尝试用

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

来源

2016-02-16 06:07:04 thislooksfun

致命错误：无法增加endIndex的

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