运行 Swift 应用程序时的分段错误 11

Question

我刚刚更新到最新的 Xcode 6.3 测试版，但我收到一个错误，我无法找出解决方案。

当我运行我的应用程序时，出现错误：Command failed due to signal: Segmentation Fault 11。我查看了完整的错误消息，并删除了我认为相关的部分：

(unresolved_dot_expr type='@lvalue String!' location=/Filename/FifthViewController.swift:423:19 range=[/Filename/FifthViewController.swift:423:9 - line:423:19] field 'text'
  (declref_expr type='UITextField' location=/Filename/FifthViewController.swift:423:9 range=[/Filename/FifthViewController.swift:423:9 - line:423:9] decl=AffordIt.(file).FifthViewController.func decl.textField@/Filename/FifthViewController.swift:418:34 specialized=yes))

和

While emitting SIL for 'textFieldDidChangeValue' at /Filename/FifthViewController.swift:418:5

有人有什么想法吗？显然我已经用 'Filename' 替换了完整路径。这是与错误相关的代码：

textField.addTarget(self, action: "textFieldDidChangeValue:", forControlEvents: UIControlEvents.EditingChanged)

func textFieldDidChangeValue(textField: UITextField) {
    //Automatic formatting for transaction value text field. Target is added above.
    var text = textField.text.stringByReplacingOccurrencesOfString(currencyFormatter.currencySymbol!, withString: "").stringByReplacingOccurrencesOfString(currencyFormatter.groupingSeparator, withString: "").stringByReplacingOccurrencesOfString(currencyFormatter.decimalSeparator!, withString: "").stringByReplacingOccurrencesOfString(" ", withString: "") // There is a special character here. This line is critical for european/other currencies.
    println(textField.text)

    textField.text = currencyFormatter.stringFromNumber((text as NSString).doubleValue / 100.0)
    currencyDouble = (text as NSString).doubleValue / 100.0
    valueEnter.alpha = 1
}

这里是 currencyFormatter 的初始化：

    let currencyFormatter = NSNumberFormatter()
    currencyFormatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle

    if let currencyCode = NSLocale.currentLocale().objectForKey(NSLocaleCurrencyCode) as? String {
        currencyFormatter.currencyCode = currencyCode
    }

Answer 1

我在这里遇到了同样的问题，它与代码本身无关。两天前升级到Apple发布的Xcode 6.3 beta 2后，所有这些都消失了。试一试

Answer 2

这可能不太可能，但是您的 currencyFormatter 是如何声明的？它是否标有 ! 而未初始化？我使用以下代码来测试错误声明，它在我的 Swift iOS 游乐场中表现得很奇怪：

var myTextField = UITextField()
var currencyFormatter : NSNumberFormatter!  // Possible offender! Not initiliased, and forcefully unwrapped!!!

func myFunc(textField: UITextField) {
    //Automatic formatting for transaction value text field. Target is added above.
    var text : String = textField.text // Error: Execution was interrupted, reason: EXC_BAD_INSTRUCTION


    //if currencyFormatter !=  nil {
        text = textField.text
           .stringByReplacingOccurrencesOfString(currencyFormatter.currencySymbol!, withString: "")
           .stringByReplacingOccurrencesOfString(currencyFormatter.groupingSeparator, withString: "")
           .stringByReplacingOccurrencesOfString(currencyFormatter.decimalSeparator!, withString: "")
           .stringByReplacingOccurrencesOfString(" ", withString: "") // There is a special character here. This line is critical for european/other currencies.

           println("original: \(textField.text), after replacing: \(text)")
           textField.text = currencyFormatter.stringFromNumber((text as NSString).doubleValue / 100.0)
           println("new: \(textField.text)")

           // currencyDouble = (text as NSString).doubleValue / 100.0
           // valueEnter.alpha = 1
     // } else {
     //    println("No currencyFormatter")
     // }

}

//currencyFormatter = NSNumberFormatter()
// Uncomment line above, and the playground failed on second line in myFunc()
myTextField.text = "3.000,00"

myFunc(myTextField)
myTextField.text

如果这也是您的情况，您需要查看缺少的 currencyFormatter 初始化，并取消注释我的代码摘录中的 if 语句以避免它崩溃所有内容。如果取消注释，您还会看到这是否是您的实际错误情况，因为有一个 else 子句说明 currencyFormatter 实际上是 nil.

我调查这个案例的原因是想看看 currencyFormatter.currencySymbol! 和 currencyFormatter.decimalSeparator! 的展开是否有问题，但测试显示它们可能 nil 没有套管text == "".

之外的任何其他问题

您可能还想查看 NSNumberFormatter.numberFromString() 方法，请参阅以下内容：

var currencyFormatter = NSNumberFormatter()
currencyFormatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle

if let numberStr = currencyFormatter.stringFromNumber(NSNumber(double: 123567.45)) {

    if let number = currencyFormatter.numberFromString(numberStr) {
        println("numberStr = \(numberStr) vs number = \( number )")
    }
}

来回转换后输出numberStr = 3,567.45 vs number = 123567.45

Answer 3

看来，问题出在这一行：

textField.text = currencyFormatter.stringFromNumber((text as NSString).doubleValue / 100.0)

这一定是编译器错误。我找到的解决方法是：

// Explicitly cast as `NSNumber`
textField.text = currencyFormatter.stringFromNumber((text as NSString).doubleValue / 100.0 as NSNumber)

// or explicitly construct `NSNumber` from `Double` 
textField.text = currencyFormatter.stringFromNumber(NSNumber(double: (text as NSString).doubleValue / 100.0))

// or prepare `Double` outside
let doubleVal = (text as NSString).doubleValue / 100.0
textField.text = currencyFormatter.stringFromNumber(doubleVal)

// or convert `String` to `Double` without casting to `NSString`.
textField.text = currencyFormatter.stringFromNumber( atof(text) / 100.0)

重现此问题的最少代码为：

let str = "42"
let a:NSNumber = (str as NSString).doubleValue / 100.0

Swift 1.1/Xcode 6.1.1 编译成功，但 Swift 1.2/Xcode 6.3 Beta2 崩溃。

运行 Swift 应用程序时的分段错误 11

Segmentation Fault 11 when running Swift app

segmentation-fault

ios

swift