Common macros for iOS development

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Everyone knows that using macros is not only convenient, but also can improve development efficiency. The following summarizes some commonly used macros in the iOS development process, and will continue to add to it.

 // Is the string empty?
 #define kStringIsEmpty(str) ([str isKindOfClass:[NSNull class]] || str == nil || [str length] < 1 ? YES : NO )
 // Is the array empty?
 #define kArrayIsEmpty(array) (array == nil || [array isKindOfClass:[NSNull class]] || array. count == 0)
 //Is the dictionary empty?
 #define kDictIsEmpty(dic) (dic == nil || [dic isKindOfClass:[NSNull class]] || dic.allKeys == 0)
 //Is it an empty object?
 #define kObjectIsEmpty(_object) (_object == nil \
 || [_object isKindOfClass:[NSNull class]] \
 || ([_object respondsToSelector:@selector(length)] && [(NSData *)_object length] == 0) \
 || ([_object respondsToSelector:@selector( count )] && [(NSArray *)_object count ] == 0)) 
  
 //Get screen width and height
 #define kScreenWidth \
 ([[UIScreen mainScreen] respondsToSelector:@selector(nativeBounds)] ? [UIScreenmainScreen].nativeBounds. size .width/[UIScreen mainScreen].nativeScale : [UIScreen mainScreen].bounds. size .width)
 #define kScreenHeight \
 ([[UIScreen mainScreen] respondsToSelector:@selector(nativeBounds)] ? [UIScreenmainScreen].nativeBounds. size .height/[UIScreen mainScreen].nativeScale : [UIScreen mainScreen].bounds. size .height)
 #define kScreenSize \
 ([[UIScreen mainScreen] respondsToSelector:@selector(nativeBounds)] ? CGSizeMake([UIScreenmainScreen].nativeBounds. size .width/[UIScreen mainScreen].nativeScale,[UIScreenmainScreen].nativeBounds. size .height/[UIScreen mainScreen].nativeScale) : [UIScreen mainScreen].bounds. size ) 
  
 //Some abbreviations
 #define kApplication [UIApplication sharedApplication]
 #define kKeyWindow [UIApplication sharedApplication].keyWindow
 #define kAppDelegate [UIApplication sharedApplication].delegate
 #define kUserDefaults [NSUserDefaults standardUserDefaults]
 #define kNotificationCenter [NSNotificationCenter defaultCenter] 
  
 //APP version number
 #define kAppVersion [[[NSBundle mainBundle] infoDictionary] objectForKey:@ "CFBundleShortVersionString" ]
 //System version number
 #define kSystemVersion [[UIDevice currentDevice] systemVersion]
 //Get the current language
 #define kCurrentLanguage ([[NSLocale preferredLanguages] objectAtIndex:0])
 //Judge whether it is an iPhone
 #define kISiPhone (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
 //Judge whether it is iPad
 #define kISiPad (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) 
  
 //Get the sandbox Document path
 #define kDocumentPath [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]
 //Get the sandbox temp path
 #define kTempPath NSTemporaryDirectory()
 //Get the sandbox cache path
 #define kCachePath [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject] 
  
 //Judge whether it is a real device or a simulator
 #if TARGET_OS_IPHONE
 //Real machine
 #endif 
  
 #if TARGET_IPHONE_SIMULATOR
 //Simulator
 #endif 
  
 //NSLog that prints during development but not during release
 #ifdef DEBUG
 #define NSLog(...) NSLog(@ "%s line %d \n %@\n\n" ,__func__,__LINE__,[NSString stringWithFormat:__VA_ARGS__])
 # else  
 #define NSLog(...)
 #endif 
  
 //color
 #define kRGBColor(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0]
 #define kRGBAColor(r, g, b, a) [UIColor colorWithRed:(r)/255.0 green:(r)/255.0 blue:(r)/255.0 alpha:a]
 #define kRandomColor KRGBColor(arc4random_uniform(256)/255.0,arc4random_uniform(256)/255.0,arc4random_uniform(256)/255.0) 
  
 #define kColorWithHex(rgbValue) \
 [UIColor colorWithRed:(( float )((rgbValue & 0xFF0000) >> 16)) / 255.0 \
 green:(( float )((rgbValue & 0xFF00) >> 8)) / 255.0 \
 blue:(( float )(rgbValue & 0xFF)) / 255.0 alpha:1.0] 
  
 //Weak reference/strong reference
 #define kWeakSelf(type) __weak typeof(type) weak##type = type;
 #define kStrongSelf(type) __strong typeof(type) type = weak##type; 
  
 //Convert from degrees to radians
 #define kDegreesToRadian(x) (M_PI * (x) / 180.0)
 //Convert from radians to degrees
 #define kRadianToDegrees(radian) (radian * 180.0) / (M_PI) 
  
 //Get a time interval
 #define kStartTime CFAbsoluteTime start = CFAbsoluteTimeGetCurrent();
 #define kEndTime NSLog(@ "Time: %f" , CFAbsoluteTimeGetCurrent() - start)