将Xcode更新为7.0后出错 [英] error after updating the Xcode to 7.0

问题描述

我正在Swift中开发一个iOS应用程序。
当我将Xcode更新为7.0时，我在swiftyJSON中遇到错误。

I'm developing an iOS application in Swift. When I updated the Xcode to 7.0, I'm getting error in swiftyJSON.

 static func fromObject(object: AnyObject) -> JSONValue? {
    switch object {
    case let value as NSString:
        return JSONValue.JSONString(value as String)
    case let value as NSNumber:
        return JSONValue.JSONNumber(value)
    case let value as NSNull:
        return JSONValue.JSONNull
    case let value as NSDictionary:
        var jsonObject: [String:JSONValue] = [:]
        for (k:AnyObject, v:AnyObject) in value {// **THIS LINE- error: "Definition conflicts with previous value"**
            if let k = k as? NSString {
                if let v = JSONValue.fromObject(v) {
                    jsonObject[k] = v
                } else {
                    return nil
                }
            }
        }

有什么问题？你能帮忙吗？

What's the problem? Can you help, please?

推荐答案

 for (k:AnyObject, v:AnyObject) in value { .. }

必须用Swift 2写成

must be written in Swift 2 as

for (k, v) : (AnyObject, AnyObject) in value { .. }

从Xcode 7发行说明：

From the Xcode 7 release notes:

模式中不再允许使用类型注释并被视为边远声明的b $ b b部分。这意味着之前的代码
写为：

Type annotations are no longer allowed in patterns and are considered part of the outlying declaration. This means that code previously written as:

var (a : Int, b : Float) = foo()

需要写成：

var (a,b) : (Int, Float) = foo()

如果需要显式类型注释。前一种语法是
与元组元素标签不明确。

if an explicit type annotation is needed. The former syntax was ambiguous with tuple element labels.

但在你的情况下，实际上根本不需要显式注释：

But in your case the explicit annotation is actually not needed at all:

for (k, v) in value { .. }

因为 NSDictionary.Generator 已被定义为生成器
返回 （键：AnyObject，值：AnyObject）元素。

because NSDictionary.Generator is already defined as a generator returning (key: AnyObject, value: AnyObject) elements.

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