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,这是从日志记录宏中使用的.
虽然Swift不支持宏(我认为),但我仍然希望使用包含被调用函数名称的通用日志语句.在Swift中可以吗？
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 您可以使用以下命令安装:
pod 'Stuff/Print'
这是代码:
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
Kre*_*iri 94
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.
Ram*_*mis 67
从Swift 2.2开始我们应该使用:
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
peg*_*peg 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]")
}
}
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.
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
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";
}
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)")
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