如何在Swift中恢复堆栈跟踪？

Question

如何在Swift中恢复堆栈跟踪，以便我可以找出在崩溃之前调用的最后一个方法？

我想在Swift中复制的是C＃中的这个方法：

public static Assembly GetComponentInInvocationDegree(int invocationDegree)
    {
        if (invocationDegree < 0) throw new ArgumentOutOfRangeException("Cannot set out of range value: invocation degree must be greater than or equal to zero");

        var stackInvocacion = new StackTrace().GetFrames();
        if (invocationDegree > 0)
        {
            int invokingAssemblyIndex = 0;
            string currentDegreeComponentName;
            try
            {
                for (int currentDegree = 0; currentDegree < invocationDegree; currentDegree++)
                {
                    currentDegreeComponentName = stackInvocacion[invokingAssemblyIndex].GetMethod().ReflectedType.Assembly.GetName().Name;
                    while (stackInvocacion[invokingAssemblyIndex].GetMethod().ReflectedType.Assembly.GetName().Name == currentDegreeComponentName) invokingAssemblyIndex++;                        
                }
            }
            catch (Exception ex) { throw new InvalidOperationException(string.Format("Cannot get component in invocation degree: invocation degree {0} does not exist", invocationDegree), ex); }

            return stackInvocacion[invokingAssemblyIndex].GetMethod().ReflectedType.Assembly;
        }

        return stackInvocacion[0].GetMethod().ReflectedType.Assembly;
    }

Answer 1

在许多情况下，您可以使用try/catch机制。

do {
    try ... // risky business goes here
} catch let error as NSError {
    print("Error: \(error.domain)")
    println(NSThread.callStackSymbols())
}     

Answer 2

在 swift 中，你可以这样做：

do {
    //....
}
catch {
    print("error occurred")
    print(Thread.callStackSymbols)
}