iOS development uses more code-positioned log

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About log, printing the current function is nothing more than _cmd, __func__, __function__, __pretty_function__, in Xcode _cmd will return a Sel object,

And all that's left is the C/C + + compiler's definition, so it's going to go back to the string, and the results are all the same, and there might be a small difference between the compilers.

Obviously behind the __func__ series is better than _cmd , relative to the Objective-c type of method calls,

Not only does he display the method name, but it also displays the type, with __line__, which can pinpoint the location of the log in the code.

such as this:

@implementationmyclass+ (void) doo{//__func__, __function__, __pretty_function__, all the same .    NSLog(@ "Method:%s, line:%d.", __func__, __line__);}@end

Will output:
Method: +[myclass Doo], line:16.

We can also define some macros to be used quickly in nslog or other log frames, such as:

#define Funcinf [NSString stringwithformat:@"m:%s, l:%d.", __func__, __line__] #define PFUNCINF (x) @"%@|%@", Funcinf, X#define ppfuncinf (x1, x2) @"%@|%@|%@", Funcinf, X1, x2#define pppfuncinf (x1, x2, x3) @"%@|%@|%@|%@", Funcinf, X1, x2, x3

For example, suppose the following code is called in the Applicationdidfinishlaunching method of Appdelegate:

Use the ddlogerror of the NSLog and Cocoa lumberjack Log frames respectively (parameters and NSLog):

NSLog(Pfuncinf(@ "Start operation"));NSLog(Ppfuncinf(@ "Action 1", @123));NSLog(Pppfuncinf(@ "Action 2", @ "Sub-action 1", @ "Result 1"));//used directly in the log of Cocoa lumberjackDdlogerror(Ppfuncinf(@ "Action 3", @ "Error 1"));

Output log (M for method name, L for number of rows):

M:-[appdelegate applicationdidfinishlaunching:], l:60.| Start Operation M:-[appdelegate applicationdidfinishlaunching:], l:61.| Operation 1|123m:-[appdelegate Applicationdidfinishlaunching:], l:62.| Operation 2| 1| results 1m:-[appdelegate applicationdidfinishlaunching:], l:64.| Operation 3| Error 1

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iOS development uses more code-positioned log