我正在尝试突出显示阿拉伯语文本,但它不起作用,最后程序崩溃并显示错误:
Terminating app due to uncaught exception 'NSRangeException', reason: 'NSMutableRLEArray objectAtIndex:effectiveRange:: Out of bounds'
我的代码是:
super.viewDidLoad()
myMutableString = NSMutableAttributedString(string: longString)
var currentLocation = 0
var currentLength = 0
var char = CharacterSet.whitespaces
let arrayOfWords = longString.components(separatedBy: char)
for word in arrayOfWords
{
currentLength = word.characters.count
ranges.append(NSRange(location: currentLocation, length: currentLocation+currentLength))
currentLocation += currentLength + 1
}
let mySelector = #selector(self.keepHighlighting)
let timer = Timer.scheduledTimer(timeInterval:0.5, target: self, selector: mySelector, userInfo: tempLbl , repeats: true)
timer.fire()
}
突出显示部分是:
func keepHighlighting(timer:Timer)
{
let lbl = timer.userInfo as! UILabel
myMutableString.addAttribute(NSFontAttributeName, value: UIFont(name: "Al_Mushaf", size: 40.0)!, range:ranges[wordNum])
myMutableString.addAttribute(NSForegroundColorAttributeName,value: UIColor.blue,range: ranges[wordNum] )
lbl.attributedText = myMutableString
wordNum = wordNum + 1
}
这段代码正在工作,但它们的索引范围最终不匹配......
看起来wordNum不断增加,没有限制。如果您从不停止计时器或重置 wordNum,这显然最终会从数组的末尾运行。
您可能需要将计时器存储在属性中,并在到达单词列表末尾时invalidate
计时器。
删除timer.fire()
,创建计时器时已安排计时器。另外,尝试删除 keepHighlighting
函数中的 timer 参数,并将userInfo
设置为 nil
,并直接从userInfo
调用标签。