ios 使用swift记录方法签名
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Logging Method signature using swift
提问by Essa A. Haddad
I am trying to rewrite my logging class and I would like to know how to substitute PRETTY_FUNCTIONor NSStringFromSelector(_cmd) in a swift file in order to track the method calls?
我正在尝试重写我的日志记录类，我想知道如何在 swift 文件中替换PRETTY_FUNCTION或 NSStringFromSelector(_cmd) 以跟踪方法调用？
回答by Nick
Special literals in swift are as follows (from [the swift guide]
swift 中的特殊文字如下（来自 [the swift guide]
#fileStringThe name of the file in which it appears.
#file字符串出现它的文件的名称。
#lineIntThe line number on which it appears.
#lineInt它出现的行号。
#columnIntThe column number in which it begins.
#columnInt 开始的列号。
#functionStringThe name of the declaration in which it appears.
#functionString它出现的声明的名称。
Prior to Swift 2.2b4, these were
在 Swift 2.2b4 之前，这些是
__FILE__StringThe name of the file in which it appears.
__FILE__字符串出现它的文件的名称。
__LINE__IntThe line number on which it appears.
__LINE__Int它出现的行号。
__COLUMN__IntThe column number in which it begins.
__COLUMN__Int 开始的列号。
__FUNCTION__StringThe name of the declaration in which it appears.
__FUNCTION__String它出现的声明的名称。
You can use these in logging statements like so:
您可以在日志记录语句中使用它们，如下所示：
println("error occurred on line \(__LINE__) in function \(__FUNCTION__)")
println("error occurred on line \(__LINE__) in function \(__FUNCTION__)")
回答by Dave Wood
Check out a new library I've just published: https://github.com/DaveWoodCom/XCGLogger
查看我刚刚发布的新库：https: //github.com/DaveWoodCom/XCGLogger
It's a debug logging library for Swift.
它是 Swift 的调试日志库。
The key to being able to use the #functionmacros, is to set them as default values to your logging function. The compiler will then fill them in using the expected values.
能够使用#function宏的关键是将它们设置为日志功能的默认值。然后编译器将使用预期值填充它们。
func log(logMessage: String, functionName: String = #function) {
print("\(functionName): \(logMessage)")
}
Then just call:
然后只需调用：
log("my message")
And it works as expected giving you something like:
它按预期工作，为您提供以下内容：
whateverFunction(): my message
More info on how this works: https://www.cerebralgardens.com/blog/entry/2014/06/09/the-first-essential-swift-3rd-party-library-to-include-in-your-project
有关其工作原理的更多信息：https: //www.cerebralgardens.com/blog/entry/2014/06/09/the-first-essential-swift-3rd-party-library-to-include-in-your-project
回答by pipacs
I'd use something like this:
我会使用这样的东西：
func Log(message: String = "", _ path: String = __FILE__, _ function: String = __FUNCTION__) {
let file = path.componentsSeparatedByString("/").last!.componentsSeparatedByString(".").first! // Sorry
NSLog("\(file).\(function): \(message)")
}
Improvements compared to previous answers:
与以前的答案相比的改进：
- Uses NSLog, not print/println
- Does not use lastPathComponent which is not available on Strings anymore
- The log message is optional
- 使用 NSLog，而不是打印/打印
- 不使用不再在字符串上可用的 lastPathComponent
- 日志消息是可选的
回答by Chris Prince
Try this:
尝试这个：
class Log {
class func msg(message: String,
functionName: String = __FUNCTION__, fileNameWithPath: String = __FILE__, lineNumber: Int = __LINE__ ) {
// In the default arguments to this function:
// 1) If I use a String type, the macros (e.g., __LINE__) don't expand at run time.
// "\(__FUNCTION__)\(__FILE__)\(__LINE__)"
// 2) A tuple type, like,
// typealias SMLogFuncDetails = (String, String, Int)
// SMLogFuncDetails = (__FUNCTION__, __FILE__, __LINE__)
// doesn't work either.
// 3) This String = __FUNCTION__ + __FILE__
// also doesn't work.
var fileNameWithoutPath = fileNameWithPath.lastPathComponent
#if DEBUG
let output = "\(NSDate()): \(message) [\(functionName) in \(fileNameWithoutPath), line \(lineNumber)]"
println(output)
#endif
}
}
Log using:
记录使用：
let x = 100
Log.msg("My output message \(x)")
回答by Esqarrouth
Here is what I used in: https://github.com/goktugyil/QorumLogs
Its like XCGLogger but better.
这是我使用的内容：https: //github.com/goktugyil/QorumLogs
它像 XCGLogger 但更好。
func myLog<T>(object: T, _ file: String = __FILE__, _ function: String = __FUNCTION__, _ line: Int = __LINE__) {
let info = "\(file).\(function)[\(line)]:\(object)"
print(info)
}
回答by tesla
This will print only in debug mode:
这将仅在调试模式下打印：
func debugLog(text: String, fileName: String = __FILE__, function: String = __FUNCTION__, line: Int = __LINE__) {
debugPrint("[\((fileName as NSString).lastPathComponent), in \(function)() at line: \(line)]: \(text)")
}
Result:
结果：
"[Book.swift, in addPage() at line: 33]: Page added with success"
回答by Yasir Ali
For Swift 3 and above:
对于 Swift 3 及更高版本：
print("\(#function)")
回答by luizParreira
As of Swift 2.2, you can specify it using Literal Expressions, as described at the Swift Programming Language guide.
从 Swift 2.2 开始，您可以使用 指定它Literal Expressions，如Swift 编程语言指南 中所述。
So if you had a Loggerstruct that had a function that logged where the error happened, then you would call it like this:
所以如果你有一个Logger结构体，它有一个函数记录错误发生的位置，那么你可以这样调用它：
Logger().log(message, fileName: #file, functionName: #function, atLine: #line)
Logger().log(message, fileName: #file, functionName: #function, atLine: #line)
回答by floohh
This will get you the class and the function name in one go:
这将使您一次性获得类和函数名称：
var name = NSStringFromClass(self.classForCoder) + "." + __FUNCTION__
回答by lozflan
this seems to work fine in swift 3.1
这似乎在 swift 3.1 中工作正常
print("File: \((#file as NSString).lastPathComponent) Func: \(#function) Line: \(#line)")
