是否有NSLog的Swift替代方案(@"%s",__ PRETTY_FUNCTION__)

从XCode beta 6开始,您可以使用reflect(self).summary获取类名并__FUNCTION__获取函数名称,但现在情况有点严重.希望他们能提出更好的解决方案.在我们退出测试版之前使用#define可能是值得的.

这段代码:

NSLog("[%@ %@]", reflect(self).summary, __FUNCTION__)

给出这样的结果:

2014-08-24 08:46:26.606 SwiftLessons[427:16981938] [C12SwiftLessons24HelloWorldViewController (has 2 children) goodbyeActiongoodbyeAction]

编辑:这是更多的代码,但让我更接近我需要的东西,我认为这是你想要的.

func intFromString(str: String) -> Int
{
    var result = 0;
    for chr in str.unicodeScalars
    {
        if (chr.isDigit())
        {
            let value = chr - "0";
            result *= 10;
            result += value;
        }
        else
        {
            break;
        }
    }

    return result;
}


@IBAction func flowAction(AnyObject)
{
    let cname = _stdlib_getTypeName(self)
    var parse = cname.substringFromIndex(1)                                 // strip off the "C"
    var count = self.intFromString(parse)
    var countStr = String(format: "%d", count)                              // get the number at the beginning
    parse = parse.substringFromIndex(countStr.lengthOfBytesUsingEncoding(NSUTF8StringEncoding))
    let appName = parse.substringToIndex(count)                             // pull the app name

    parse = parse.substringFromIndex(count);                                // now get the class name
    count = self.intFromString(parse)
    countStr = String(format: "%d", count)
    parse = parse.substringFromIndex(countStr.lengthOfBytesUsingEncoding(NSUTF8StringEncoding))
    let className = parse.substringToIndex(count)
    NSLog("app: %@ class: %@ func: %@", appName, className, __FUNCTION__)
}

它提供如下输出:

2014-08-24 09:52:12.159 SwiftLessons[1397:17145716] app: SwiftLessons class: ViewController func: flowAction

斯威夫特有#file,#function,#line 和 #column.来自Swift编程语言:

#file - String - 出现的文件的名称.

#line - Int - 出现的行号.

#column - Int - 开始的列号.

#function - String - 出现的声明的名称.

我更喜欢定义全局日志功能:

[Swift 3.1]

func ZYLog(_ object: Any?, filename: String = #file, line: Int = #line, funcname: String = #function) {
    #if DEBUG
    print("****\(Date()) \(filename)(\(line)) \(funcname):\r\(object ?? "nil")\n")
    #endif
}

[Swift 3.0]

func ZYLog<T>(_ object: T?, filename: String = #file, line: Int = #line, funcname: String = #function) {
    #if DEBUG
    print("****\(Date()) \(filename)(\(line)) \(funcname):\r\(object)\n")
    #endif
}

[Swift 2.0]

func ZYLog<T>(object: T, filename: String = __FILE__, line: Int = __LINE__, funcname: String = __FUNCTION__) {
    println("****\(filename.lastPathComponent)(\(line)) \(funcname):\r\(object)\n")
}

输出是这样的:

****ZYHttpSessionManager.swift(78) POST(_:parameters:success:failure:):
[POST] user/login, {
    "auth_key" = xxx;
    "auth_type" = 0;
    pwd = xxx;
    user = "xxx";
}

****PointViewController.swift(162) loadData():
review/list [limit: 30, skip: 0]

****ZYHttpSessionManager.swift(66) GET(_:parameters:success:failure:):
[GET] review/list, {
    "auth_key" = xxx;
    uuid = "xxx";
}

Swift 4
这是我的方法:

func pretty_function(_ file: String = #file, function: String = #function, line: Int = #line) {

    let fileString: NSString = NSString(string: file)

    if Thread.isMainThread {
        print("file:\(fileString.lastPathComponent) function:\(function) line:\(line) [M]")
    } else {
        print("file:\(fileString.lastPathComponent) function:\(function) line:\(line) [T]")
    }
}

使这成为一个全局函数,只需调用

pretty_function()

额外:您将看到线程被执行,[T]表示后台线程,[M]表示主线程.

这是一个更新的Swift 2答案.

func LogW(msg:String, function: String = __FUNCTION__, file: String = __FILE__, line: Int = __LINE__){
    print("[WARNING]\(makeTag(function, file: file, line: line)) : \(msg)")
}

private func makeTag(function: String, file: String, line: Int) -> String{
    let url = NSURL(fileURLWithPath: file)
    let className:String! = url.lastPathComponent == nil ? file: url.lastPathComponent!
    return "\(className) \(function)[\(line)]"
}

使用示例:

LogW("Socket connection error: \(error)")

从Swift 2.2开始我们应该使用:

#file(String)显示它的文件的名称.

#line(Int)出现的行号.

#column(Int)开始的列号.

#function(String)出现的声明的名称.

来自Swift编程语言(Swift 3.1),第894页.

func specialLiterals() {
    print("#file literal from file: \(#file)")
    print("#function literal from function: \(#function)")
    print("#line: \(#line) -> #column: \(#column)")
}
// Output:
// #file literal from file: My.playground
// #function literal from function: specialLiterals()
// #line: 10 -> #column: 42