iOS宏定义

 1.宏定义需要加括号的两种情况:
   (1)如果宏的替换列表中带有运算符,那么使用要将替换列表放到括号中。例如#define MAX_VALUE(X,Y) ((X) > (Y) ? (X) : (Y))
   (2)如果宏有参数,每次参数在替换列表中出现时都要放在括号中。同上
#define MAX_VALUE(X,Y) ((X) > (Y) ? (X) : (Y))// 求两个数中的最大值

 2.#运算符和##运算符
 (1)出现在宏定义中的#运算符把跟在其后的参数转换成一个字符串。有时把这种用法的#称为字符串化运算符。例如：
 #define PASTE(n) "adhfkj"#n
 main()
 {
 printf("%s\n",PASTE(15));
 }
 宏定义中的#运算符告诉预处理程序，把源代码中任何传递给该宏的参数转换成一个字符串。所以输出应该是adhfkj15。

针对Window,dos,os2不同的系统对WIDTH进行不同的定义
单独一行的#是空指令
#ifdef WINDOWS
#
#define WIDTH 375
#
#elif defined(DOS)
#
#define WIDTH 414
#
#elif defined(OS)
#
#define WIDTH 320
#
#else
#
//#error no sysytem;
#
#endif
 (2)##运算符用于把参数连接到一起。预处理程序把出现在##两侧的参数合并成一个符号。看下面的例子：
 #define NUM(a,b,c) a##b##c
 #define STR(a,b,c) a##b##c
 main()
 {
 printf("%d\n",NUM(1,2,3));
 printf("%s\n",STR("aa","bb","cc"));
 }
 最后程序的输出为:
 123
 aabbcc

#define IMAGE_NAME(NAME) @"image_name"#NAME // IMAGE_NAME(3)=image_name3
#define STR(NAME,AGE,SEX) @"名字:"#NAME@".年龄:"#AGE@".性别:"#SEX// 名字:@“王五".年龄:24.性别:@"男"

 3.取消宏定义
 #undef NUM1

 4.复杂宏的定义
#define NSLOG_ARRAY_OR_DICT(ARRAY,DICT) (NSLog(@"array = %@,dict = %@",[(ARRAY) description],[(DICT) description]));
//设计技巧:dowhile中出现;
#define NSLOG_ARRAY_OR_DICT2(ARRAY,DICT) do {int a =1;NSLog(@"a = %d",a);NSLog(@"array = %@,dict = %@",[(ARRAY) description],[(DICT) description]);}while(0)

5.条件编译args...表示有多个参数
(1)打印信息
#define DEBUG1
#if DEBUG
#define MY_NSLog(fmt,args...) NSLog(@fmt,##args)
#else
#define MY_NSLog(fmt,args...)
#endif

1.系统相关宏定义
/** 1.设备状态条,导航栏,tabbar高度*/
#define ZB_HEIGHT_STATUSBAR    20.f // 状态条高度
#define ZB_HEIGHT_NAVIGATIONBAR44.f // 导航栏高度
#define ZB_HEIGHT_TABBAR       49.f // tabbar高度

/** 2.设备屏幕宽度和高度(支持横屏) */
#if __IPHONE_OS_VERSION_MAX_ALLOWED >=80000 // 当前Xcode支持iOS8及以上
#define ZB_SCREEN_WIDTH ([[UIScreen mainScreen] respondsToSelector:@selector(nativeBounds)]?[UIScreen mainScreen].nativeBounds.size.width/[UIScreen mainScreen].nativeScale:[UIScreen mainScreen].bounds.size.width)
#define ZB_SCREEN_HEIGHT ([[UIScreen mainScreen] respondsToSelector:@selector(nativeBounds)]?[UIScreen mainScreen].nativeBounds.size.height/[UIScreen mainScreen].nativeScale:[UIScreen mainScreen].bounds.size.height)
#define ZB_SCREEN_SIZE ([[UIScreen mainScreen] respondsToSelector:@selector(nativeBounds)]?CGSizeMake([UIScreen mainScreen].nativeBounds.size.width/[UIScreen mainScreen].nativeScale,[UIScreen mainScreen].nativeBounds.size.height/[UIScreen mainScreen].nativeScale):[UIScreen mainScreen].bounds.size)
#else
#define ZB_SCREEN_WIDTH     [UIScreen mainScreen].bounds.size.width
#define ZB_SCREEN_HEIGHT    [UIScreen mainScreen].bounds.size.height
#define ZB_SCREEN_SIZE      [UIScreen mainScreen].bounds.size
#endif

/**
 *  3.设备类型
 *  设备屏幕高度:IPHONE4(iPhone4,iPhone4s)480;IPHONE5(iPhone5,iPhone5s)568;IPHONE6 667;IPHONE6PLUS 736.
 *  EPSILON是最小误差,DBL_EPSILON是双浮点型(double)最小误差,是EPSILON+X不等于X的最小的正数
 */
#if TARGET_IPHONE_SIMULATOR// 模拟器
#define IPHONE4             ( fabs( ( double )[ [ UIScreen mainScreen ] bounds ].size.height - ( double )480) < DBL_EPSILON )
#define IPHONE5             ( fabs( ( double )[ [ UIScreen mainScreen ] bounds ].size.height - ( double )568) < DBL_EPSILON )
#define IPHONE6             ( fabs( ( double )[ [ UIScreen mainScreen ] bounds ].size.height - ( double )667) < DBL_EPSILON )
#define IPHONE6PLUS         ( fabs( ( double )[ [ UIScreen mainScreen ] bounds ].size.height - ( double )736) < DBL_EPSILON )
#elif TARGET_OS_IPHONE // 真机
#define IPHONE4             ( fabs( ( double )[ [ UIScreen mainScreen ] bounds ].size.height - ( double )480) < DBL_EPSILON )
#define IPHONE5             ( fabs( ( double )[ [ UIScreen mainScreen ] bounds ].size.height - ( double )568) < DBL_EPSILON )
#define IPHONE6             ( fabs( ( double )[ [ UIScreen mainScreen ] bounds ].size.height - ( double )667) < DBL_EPSILON )
#define IPHONE6PLUS         ( fabs( ( double )[ [ UIScreen mainScreen ] bounds ].size.height - ( double )736) < DBL_EPSILON )
#endif
//判断是否为iPhone
#define ZB_IS_IPHONE           (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
//判断是否为iPad
#define ZB_IS_IPAD             (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
//判断是否为ipod
#define ZB_IS_IPOD             ([[[UIDevice currentDevice] model] isEqualToString:@"iPod touch"])


/**
 *  4.设备系统版本
 */
#define iOS6_LATER          ([[UIDevice currentDevice].systemVersion floatValue] >=6.0)
#define iOS7_LATER          ([[UIDevice currentDevice].systemVersion floatValue] >=7.0)
#define iOS8_LATER          ([[UIDevice currentDevice].systemVersion floatValue] >=8.0)
#define iOS9_LATER          ([[UIDevice currentDevice].systemVersion floatValue] >=9.0)
#define iOS7_0              ([[UIDevice currentDevice].systemVersion floatValue] ==7.0)
#define iOS7_1              ([[UIDevice currentDevice].systemVersion floatValue] ==7.1)
#define iOS8_0              ([[UIDevice currentDevice].systemVersion floatValue] ==8.0)
#define iOS8_1              ([[UIDevice currentDevice].systemVersion floatValue] ==8.1)
#define iOS8_2              ([[UIDevice currentDevice].systemVersion floatValue] ==8.2)
#define iOS8_3              ([[UIDevice currentDevice].systemVersion floatValue] ==8.3)
#define iOS9_0              ([[UIDevice currentDevice].systemVersion floatValue] ==9.0)
#define iOS9_1              ([[UIDevice currentDevice].systemVersion floatValue] ==7.1)

/** 5.获取temp,沙盒Document,沙盒Cache目录*/
#define ZB_PATH_TEMP        NSTemporaryDirectory()
#define ZB_PATH_DOCUMENT    [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]
#define ZB_PATH_CACHE       [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject]

/** 6.ARC/MRC */
#if __has_feature(objc_arc)
// ARC
#else
// MRC
#endif

2.自定义宏

/** 1.颜色字体*/
#define ZB_COLOR_HEX(x)              ([UIColor colorWithHexColor:(x)])
#define ZB_COLOR(r,g,b)              ([UIColor colorWithRed:(r)/255.0green:(g)/255.0blue:(b)/255.0alpha:255/255.0])
#define ZB_COLOR_ALPHA(r,g,b,a)      ([UIColor colorWithRed:(r)/255.0green:(g)/255.0blue:(b)/255.0alpha:(a)])
#define ZB_COLOR_RANDOM              ([UIColor colorWithRed:arc4random_uniform(256)/255.0green:arc4random_uniform(256)/255.0blue:arc4random_uniform(256)/255.0alpha:1.0])
#define ZB_FONT(x)                   ([UIFont systemFontOfSize:(x)])

/** 2.空值判断*/
#define ZB_IS_EMPTY_STR(_str)        (((_str) == nil) || ([(_str) isEqual:[NSNull null]]) ||([(_str)isEqualToString:@""]))
#define ZB_IS_EMPTY_ARR(_arr)        (((_arr) == nil) || ([(_arr) isEqual:[NSNull null]]) ||([(_arr) count] ==0))

/** 3.单例*/
//声明单例
#undef  ZB_SINGLETON_DEFINE
#define ZB_SINGLETON_DEFINE( __class ) \
+ (__class *)sharedInstance;
//实现单例
#undef  ZB_SINGLETON_IMPLEMENT
#define ZB_SINGLETON_IMPLEMENT( __class ) \
+ (__class *)sharedInstance \
{ \
static __class * __singleton__ = nil; \
static dispatch_once_t onceToken; \
dispatch_once(&onceToken, ^{ \
__singleton__ = [[__class alloc] init]; \
}); \
return __singleton__; \
}

/** 4.打印日志*/
#ifdef DEBUG
#define ZBLog(...)  NSLog(__VA_ARGS__)
#define ZB_LOG_INT(N) NSLog(@"%d",(N))
#define ZB_LOG_FLOAT(F) NSLog(@"%f",(F))
#define ZB_LOG_INTEGER(I) NSLog(@"%ld",(long)(I))
#else
#define ZBLog(...)
#define ZB_LOG_INT(N)
#define ZB_LOG_FLOAT(F)
#define ZB_LOG_INTEGER(I)
#endif

/** 5.weakself/strongself */
#define ZB_WEAK_SELF(type)  __weak typeof(type) weak##type = type;
#define ZB_STRONG_SELF(type)  __strong typeof(weak##type) strong##type = weak##type;

/** 6.GCD */
// GCD -一次性执行
#define ZB_DISPATCH_ONCE_BLOCK(onceBlock) static dispatch_once_t onceToken; dispatch_once(&onceToken, onceBlock);
// GCD -在Main线程上运行
#define ZB_DISPATCH_MAIN_THREAD(mainQueueBlock) dispatch_async(dispatch_get_main_queue(), mainQueueBlock);
// GCD -开启异步线程
#define ZB_DISPATCH_GLOBAL_QUEUE_DEFAULT(globalQueueBlock) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0), globalQueueBlock);

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