How to use the. pch file in iOS

PCH can be used to store shared information, such as the width and height of a device's screen. Version and so on common information

The old version of Xcode will create the PCH file for us on its own initiative, and the new version number is not created on its own initiative. Suppose you need to use the ability to manually create

Can define constants in the inside after creation

Here is an example of screen size

For example, the following

------------------------Cutting line------------------------cutting line------------------------cutting line------------------------cutting line------------- -----------Cutting line------------------------cutting line------------------------

The code is as follows:

// Get screen width, height

#define SCREEN_FRAME ([UIScreen mainscreen].applicationframe)

#define SCREEN_WIDTH ([UIScreen mainscreen].bounds.size.width)

#define Screen_height ([UIScreen mainscreen].bounds.size.height)

Finally need to do a configuration

And then use it in the program to directly use the

CGRectMake (0,screen_width, screen_height- )

How to use the. pch file in iOS