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

时间:2014-06-25 07:21:39

标签: swift

在Objective C中,您可以使用以下命令记录正在调用的方法:

NSLog(@"%s", __PRETTY_FUNCTION__)

通常这是从记录宏中使用的。

虽然Swift不支持宏(我认为),但我仍然想使用包含被调用函数名称的通用日志语句。这在Swift中可能吗?

更新 我现在使用此全局函数进行日志记录,可在此处找到: https://github.com/evermeer/Stuff#print 您可以使用以下方式安装:

pod 'Stuff/Print'

以下是代码:

public class Stuff {

    public enum logLevel: Int {
        case info = 1
        case debug = 2
        case warn = 3
        case error = 4
        case fatal = 5
        case none = 6

        public func description() -> String {
            switch self {
            case .info:
                return "❓"
            case .debug:
                return "✳️"
            case .warn:
                return "⚠️"
            case .error:
                return ""
            case .fatal:
                return ""
            case .none:
                return ""
            }
        }
    }

    public static var minimumLogLevel: logLevel = .info

    public static func print<T>(_ object: T, _ level: logLevel = .debug, filename: String = #file, line: Int = #line, funcname: String = #function) {
        if level.rawValue >= Stuff.minimumLogLevel.rawValue {
            let dateFormatter = DateFormatter()
            dateFormatter.dateFormat = "MM/dd/yyyy HH:mm:ss:SSS"
            let process = ProcessInfo.processInfo
            let threadId = "?"
            let file = URL(string: filename)?.lastPathComponent ?? ""
            Swift.print("\n\(level.description()) .\(level) ⏱ \(dateFormatter.string(from: Foundation.Date()))  \(process.processName) [\(process.processIdentifier):\(threadId)]  \(file)(\(line)) ⚙️ \(funcname) ➡️\r\t\(object)")
        }
    }
}

您可以这样使用:

Stuff.print("Just as the standard print but now with detailed information")
Stuff.print("Now it's a warning", .warn)
Stuff.print("Or even an error", .error)

Stuff.minimumLogLevel = .error
Stuff.print("Now you won't see normal log output")
Stuff.print("Only errors are shown", .error)

Stuff.minimumLogLevel = .none
Stuff.print("Or if it's disabled you won't see any log", .error)    

这将导致:

✳️ .debug ⏱ 02/13/2017 09:52:51:852  xctest [18960:?]  PrintStuffTests.swift(15) ⚙️ testExample() ➡️
    Just as the standard print but now with detailed information

⚠️ .warn ⏱ 02/13/2017 09:52:51:855  xctest [18960:?]  PrintStuffTests.swift(16) ⚙️ testExample() ➡️
    Now it's a warning

 .error ⏱ 02/13/2017 09:52:51:855  xctest [18960:?]  PrintStuffTests.swift(17) ⚙️ testExample() ➡️
    Or even an error

 .error ⏱ 02/13/2017 09:52:51:855  xctest [18960:?]  PrintStuffTests.swift(21) ⚙️ testExample() ➡️
    Only errors are shown

11 个答案:

答案 0 :(得分:86)

Swift有#file#function#line#column。来自Swift Programming Language

#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。

答案 1 :(得分:65)

从Swift 2.2开始,我们应该使用:

  • #file (字符串)出现的文件的名称。
  • #line (Int)显示的行号。
  • #column (Int)开始的列号。
  • #function (字符串)出现的声明的名称。

第894页的 The Swift Programming Language (Swift 3.1)

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

答案 2 :(得分:17)

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]")
    }
}

将此设为全局功能,然后调用

pretty_function()

奖励:您将看到线程被执行,[T]用于后台线程,[M]用于主线程。

答案 3 :(得分:9)

从XCode beta 6开始,你可以使用reflect(self).summary来获取类名,使用__FUNCTION__来获取函数名,但是现在有些事情已经被破坏了。希望他们能够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。

此代码:

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

给出如下结果:

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,我认为这就是你想要的。

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

答案 4 :(得分:8)

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")
}

输出类似于:

****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";
}

答案 5 :(得分:5)

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)")

答案 6 :(得分:0)

我使用,这是swift文件中所需的全部内容,所有其他文件都会将其拾取(作为全局函数)。 当您想要发布应用程序时,只需注释掉该行。

import UIKit

func logFunctionName(file:NSString = __FILE__, fnc:String = __FUNCTION__){  
    println("\(file.lastPathComponent):\(fnc)")
}

答案 7 :(得分:0)

或轻微的功能修改:

func logFunctionName(file:String = __FILE__, fnc:String = __FUNCTION__, line:(Int)=__LINE__) {
    var className = file.lastPathComponent.componentsSeparatedByString(".")
    println("\(className[0]):\(fnc):\(line)")

}

/ *将生成执行跟踪,如: AppDelegate中:应用程序(_中:didFinishLaunchingWithOptions :):18 产品:初始化(类型:名称:年:价格:):34 FirstViewController:viewDidLoad中():15 AppDelegate中:applicationDidBecomeActive:62 * /

答案 8 :(得分:0)

记录函数调用的另一种方法:

NSLog("\(type(of:self)): %@", #function)

答案 9 :(得分:0)

Swift 3.0

public func LogFunction<T>(object: T, filename: String = #file, line: Int = #line, funcname: String = #function) {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "MM/dd/yyyy HH:mm:ss:SSS"
    let process = ProcessInfo.processInfo()
    let threadId = "?"
    print("\(dateFormatter.string(from:Date())) \(process.processName) [\(process.processIdentifier):\(threadId)] \(filename)(\(line)) \(funcname)::: \(object)")
}

答案 10 :(得分:0)

Swift 3.x +

如果您不想要整个文件名,那么可以快速解决此问题。

func trace(fileName:String = #file, lineNumber:Int = #line, functionName:String = #function) -> Void {
    print("filename: \(fileName.components(separatedBy: "/").last!) function: \(functionName) line: #\(lineNumber)")
}

filename: ViewController.swift function: viewDidLoad() line: #42