IOS (using PCH file Import header file method)

1. Select the supporting Files folder under Project and select the PCH file to create a new PCH.

2. Here to demonstrate the import afnetworking header file (of course, you have already imported AFN folder in the project)

#ifdef __objc__ // is referenced only by the object-c file

#import <UIKit/UIKit.h>

#import "AFNetworking.h"

#define CITYDATAURL @"Http://www.hunliji.com/cities.json"//This macro definition of the whole project can be called, do not have to write repeatedly (benefit)

#endif

, write in this middle

3. Below we need to configure something, select Target (project name) and select

Note: precompile Prefix Header Select Yes

Then after the prefix Header $ (srcroot)/engineering name (oh here is marry)/pch filename. pch

IOS (using PCH file Import header file method)