[Cocoa] custom prefix. PCH file in xcode

Customize prefix. PCH files in xcode

Luo chaohui (http://www.cnblogs.com/kesalin)

This article follows the "signature-non-commercial use-consistency" creation public agreement

The extension PCH indicates the "precompliled Header", that is, the pre-compiled header file. prefix. PCH is the default pre-compiled header file generated by the xcode project. In this file, we can customize some global macros to facilitate development.

The following post is from
Cocoa is my girlfriendCustomized macros:

 

# Ifdef debug
 # Define Dlog (...) nslog (@ "% S % @", _ pretty_function __, [nsstring stringwithformat :__ va_args _])
 # Define Alog (...) [[nsassertionhandler currenthandler] handlefailureinfunction: [nsstring stringwithcstring :__ pretty_function _ encoding: encoding] File: [nsstring stringwithcstring :__ file _ encoding: encoding] linenumber: __line _ description :__ va_args _]
 # Else 
 # Define Dlog (...) do {} while (0)
# Ifndef ns_block_assertions
 # Define Ns_block_assertions
# Endif 
 # Define Alog (...) nslog (@ "% S % @", _ pretty_function __, [nsstring stringwithformat :__ va_args _])
 # Endif 

 # Define Zassert (condition,...) do {If (! (Condition) {alog (_ va_args _) ;}} while (0)

For more information, see the original article. Here I will only describe its usage:

1. In debug modePreprocessor
Set the debug macro in macros;

2. dlog is equivalent to nslog, but only valid in debug mode;
In release mode, it does nothing;

3. alog is short for assert log. In debug mode, it is equivalent to forced
Assert; in release mode, it is equivalent to nslog;

4. zassert is a alog with conditional judgment;

References:
My current prefix. PCH File