Definitions of common macros for iOS development

Sometimes, we need to make the code simple so that it's easy to read code. We can extract some unchanging stuff and change things as parameters. Defined as a macro, so it's much easier to write.

The following examples illustrate some common macro definitions and share them with you:

1. Determine if the device's operating system is IOS7

View Sourceprint? 1. #define IOS7   (  [[[UIDevice currentDevice].systemVersion doubleValue] >= 7.0 ] )

2. Determine if the current device is IPhone5

View Sourceprint? 1. #define kScreenIphone5    (([[UIScreen mainScreen] bounds].size.height)>= 568 )

3. Get the height of the current screen

View Sourceprint? 1. #define kMainScreenHeight ([UIScreen mainScreen].applicationFrame.size.height)

4. Get the width of the current screen

View Sourceprint? 1. #define kMainScreenWidth  ([UIScreen mainScreen].applicationFrame.size.width)

5. Get RGB color

View Sourceprint? 1. #define SMSColor(r, g, b) [UIColor colorWithRed:(r)/ 255.0 green:(g)/ 255.0 blue:(b)/ 255.0 alpha: 1.0 ]

6: Custom Log

#ifdef DEBUG

#define SMSLOG (...) NSLog (__va_args__)

#else

#define SMSLOG (...)

#endif

7. Single case

View Sourceprint? 01. // @interface 02. #define singleton_interface(className) 03. + (className *)shared##className; 04.  05.  06. // @implementation 07. #define singleton_implementation(className) 08. static className *_instance; 09. + (id)allocWithZone:(struct _NSZone *)zone 10. { 11. static dispatch_once_t onceToken; 12. dispatch_once(&onceToken, ^{ 13. _instance = [ super allocWithZone:zone]; 14. }); 15. return _instance; 16. } 17. + (className *)shared##className 18. { 19. static dispatch_once_t onceToken; 20. dispatch_once(&onceToken, ^{ 21. _instance = [[self alloc] init]; 22. }); 23. return _instance; 24. }

Definitions of common macros for iOS development