Ios development-commonly used macro definition (partial conversion), ios

Ios development-commonly used macro definition (partial conversion), ios

1. When release is enabled, the log is blocked.

C code

# If defined (DEBUG) & DEBUG = 1

# Else

# Define NSLog (...){};

# Endif

#if defined (DEBUG) && DEBUG == 1#else#define NSLog(...) {};#endif

 

2. Execute the block in the main thread or in the background

C code

# Define BACK (block) dispatch_async (dispatch_get_global_queue (DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), block)

# Define MAIN (block) dispatch_async (dispatch_get_main_queue (), block)

#define BACK(block) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), block)#define MAIN(block) dispatch_async(dispatch_get_main_queue(),block)

 

3. device-related

 

C code

# Define isRetina ([UIScreen instancesRespondToSelector: @ selector (currentMode)]? CGSizeEqualToSize (CGSizeMake (640,960), [[UIScreen mainScreen] currentMode]. size): NO)

# Define iPhone5 ([UIScreen instancesRespondToSelector: @ selector (currentMode)]? CGSizeEqualToSize (CGSizeMake (640,113 6), [[UIScreen mainScreen] currentMode]. size): NO)

# Define isPad (UI_USER_INTERFACE_IDIOM () = UIUserInterfaceIdiomPad)

# Define CurrentSystemVersion ([[UIDevice currentDevice] systemVersion])

# Define CurrentLanguage ([[NSLocale preferredLanguages] objectAtIndex: 0])

#define isRetina ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size) : NO)#define iPhone5 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 1136), [[UIScreen mainScreen] currentMode].size) : NO)#define isPad (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)#define CurrentSystemVersion ([[UIDevice currentDevice] systemVersion])#define CurrentLanguage ([[NSLocale preferredLanguages] objectAtIndex:0]) 

 

4. differentiate between simulators and real machines

C code

# If TARGET_ OS _IPHONE

// IPhone Device

# Endif

# If TARGET_IPHONE_SIMULATOR

// IPhone Simulator

# Endif

#if TARGET_OS_IPHONE//iPhone Device#endif#if TARGET_IPHONE_SIMULATOR//iPhone Simulator#endif

 

5. Perform different operations based on whether ARC is used

C code

# If _ has_feature (objc_arc)

// Compiling with ARC

# Else

// Compiling without ARC

# Endif