Objective C 总结（十五）：Logging

NSMutableArray *someObject = [NSMutableArray array];
NSLog(@"%s:%d someObject=%@", __func__, __LINE__, someObject);
[someObject addObject:@"foo"];
NSLog(@"%s:%d someObject=%@", __func__, __LINE__, someObject);

Table 1  Preprocessor macros and for logging in C/C++/Objective-C.

Macro	Format Specifier	Description
__func__	%s	Current function signature.
__LINE__	%d	Current line number in the source code file.
__FILE__	%s	Full path to the source code file.
__PRETTY_FUNCTION__	%s	Like __func__, but includes verbose type information in C++ code.

Table 2  Expressions for logging in Objective-C.

Expression	Format Specifier	Description
NSStringFromSelector(_cmd)	%@	Name of the current selector.
NSStringFromClass([self class])	%@	Name of the current object's class.
[[NSString stringWithUTF8String:__FILE__] lastPathComponent]	%@	Name of the source code file.
[NSThread callStackSymbols]	%@	NSArray of the current stack trace as programmer-readable strings. For debugging only, do not present it to end users or use to do any logic in your program.