Clear iOS debugging information

Like C, Objective-C provides some standard macros that describe the number of lines of the current file, source code file, and function information. Objective-C also provides related class types. Can be applied to debugging and error handling logs.

Macros provided by the pre-processor in C/C ++/Objective-C Language

* _ Func __% s current function signature * _ LINE __% d Number of current lines in the source code file

* _ FILE _ % s full path of the current source code FILE

* _ PRETTY_FUNCTION _ % s image _ func __, but contains the invisible type information in the C ++ code.

Some log information used in Objective-C

* NSStringFromSelector (_ cmd) % @ current selector name limit * NSStringFromClass ([selfclass]) % @ current Object Name limit * [[NSString stringwithuf8string: ** FILE **] lastPathComponent] % @ source code FILE name 
 * [NSThreadcallStackSymbols] % @ The Readable string array of the current stack. It is only used during scheduling.

** Sample code :**

• # Import <foundation/Foundation. h>

•

• @ Interface TestObj: NSObject

•-(Void) fun :( NSString *) input;

• @ End

•

• @ Implementation TestObj

•-(Void) fun :( NSString *) input {

NSLog (@ "% s: % d: % s", _ func __, _ LINE __, _ FILE __,__ PRETTY_FUNCTION __);

NSLog (@ "% @", NSStringFromSelector (_ cmd ));

NSLog (@ "% @", NSStringFromClass ([self class]);

NSLog (@ "% @", [[NSString stringwithuf8string :__ FILE _] lastPathComponent]);

NSLog (@ "% @", [NSThread callStackSymbols]);

NSLog (@ "% @", input );}

@ End

Int main (int argc, const char * argv []) {

@ Autoreleasepool {

TestObj * to = [[TestObj alloc] init];

[To fun: @ "call"];

[To release];

}

Return 0;

}