IOS development: Log with higher code positioning and ioslog

IOS development: Log with higher code positioning and ioslog

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For Log, printing the current FUNCTION is nothing more than _ cmd, _ func __, _ FUNCTION __, _ PRETTY_FUNCTION __. in Xcode, _ cmd returns a SEL object,

The rest are definitions from the C/C ++ compiler, so a C string is returned, and the results are similar. Different compilers may have slight differences.

Obviously, the _ func _ series are easier to use than the _ cmd series. Compared with method calls in the Objective-C type,

It not only displays the method name, but also shows the type, with _ LINE __, you can precisely locate the location of Log in the code.

For example:

@ Implementation MyClass + (void) doo {// _ func __, _ FUNCTION __, _ PRETTY_FUNCTION _ are similar to NSLog (@ "Method: % s, Line: % d. ", _ func __, _ LINE _);} @ end

Output:
Method: + [MyClass doo], Line: 16.

We can also define some macros for quick use in NSLog or other Log frameworks, such:

#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, the following code is called in the applicationDidFinishLaunching method of AppDelegate:

Use the DDLogError of the NSLog and Cocoa Lumberjack Log frameworks respectively (the parameters are the same as those of NSLog ):

NSLog (PFUNCINF (@ "Start Operation"); NSLog (PPFUNCINF (@ "Operation 1", @ 123); NSLog (PPPFUNCINF (@ "Operation 2 ", @ "sub-operation 1", @ "result 1"); // It is directly used in the Log of Cocoa Lumberjack for DDLogError (PPFUNCINF (@ "Operation 3 ", @ "error 1 "));

Output Log (M indicates the method name, and L indicates the number of rows ):

M:-[AppDelegate applicationDidFinishLaunching:], L: 60. | start operation M:-[AppDelegate applicationDidFinishLaunching:], L: 61. | operation 1 | 123 M:-[AppDelegate applicationDidFinishLaunching:], L: 62. | operation 2 | suboperation 1 | result 1 M:-[AppDelegate applicationDidFinishLaunching:], L: 64. | operation 3 | Error 1

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