宏

宏定义在很多方面都会使用，例如定义高度、判断iOS系统、工具类，还有诸如文件路径、服务端api接口文档。为了对宏能够快速定位和了解其功能，我们最好在定义的时候将其放入特定的头文件中,其主要目的是为程序员在编程时提供一定的方便，并能在一定程度上提高程序的运行效率，又能减少系统开销。

创建宏文件并引入

因为在 Xcode6以后新建项目的时候不会自动创建 pch 文件了. 那么我们如果想使用全局的宏就要自行创建一个 pch 宏文件, 然后再自行引入

• Command+N，打开新建文件窗口：ios->other->PCH file，创建一个pch文件：“projectname-Prefix.pch”
• 将building setting中的precompile header选项的路径添加“$(SRCROOT)/项目名称/pch文件名”（例如：$(SRCROOT)/Project/PrefixHeader.pch）
• 将Precompile Prefix Header为YES，预编译后的pch文件会被缓存起来，可以提高编译速度
• 编译一下程序，如果有错误检查一下添加的路径是否正确。

定义尺寸类的宏

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//状态栏高度 #define STATUS_BAR_HEIGHT 20 //NavBar高度 #define NAVIGATION_BAR_HEIGHT 44 //状态栏 ＋ 导航栏 高度 #define STATUS_AND_NAVIGATION_HEIGHT ((STATUS_BAR_HEIGHT) + (NAVIGATION_BAR_HEIGHT)) //屏幕 rect #define SCREEN_RECT ([UIScreen mainScreen].bounds) #define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width) #define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height) #define CONTENT_HEIGHT (SCREEN_HEIGHT - NAVIGATION_BAR_HEIGHT - STATUS_BAR_HEIGHT) //屏幕分辨率 #define SCREEN_RESOLUTION (SCREEN_WIDTH * SCREEN_HEIGHT * ([UIScreen mainScreen].scale)) //广告栏高度 #define BANNER_HEIGHT 215 #define STYLEPAGE_HEIGHT 21 #define SMALLTV_HEIGHT 77 #define SMALLTV_WIDTH 110 #define FOLLOW_HEIGHT 220 #define SUBCHANNEL_HEIGHT 62

定义沙盒目录文件的宏

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//文件目录 #define kPathTemp NSTemporaryDirectory() #define kPathDocument [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] #define kPathCache [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0] #define kPathSearch [kPathDocument stringByAppendingPathComponent:@"Search.plist"] #define kPathMagazine [kPathDocument stringByAppendingPathComponent:@"Magazine"] #define kPathDownloadedMgzs [kPathMagazine stringByAppendingPathComponent:@"DownloadedMgz.plist"] #define kPathDownloadURLs [kPathMagazine stringByAppendingPathComponent:@"DownloadURLs.plist"] #define kPathOperation [kPathMagazine stringByAppendingPathComponent:@"Operation.plist"] #define kPathSplashScreen [kPathCache stringByAppendingPathComponent:@"splashScreen"] #endif

工具类的宏

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// rgb颜色转换（16进制->10进制） #define UIColorFromRGB(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] // 获取RGB颜色 #define RGBA(r,g,b,a) [UIColor colorWithRed:r/255.0f green:g/255.0f blue:b/255.0f alpha:a] #define RGB(r,g,b) RGBA(r,g,b,1.0f) //背景色 #define BACKGROUND_COLOR [UIColor colorWithRed:242.0/255.0 green:236.0/255.0 blue:231.0/255.0 alpha:1.0] //清除背景色 #define CLEARCOLOR [UIColor clearColor] #define IsPortrait ([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationPortrait || [UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationPortraitUpsideDown) #define IsNilOrNull(_ref) (((_ref) == nil) || ([(_ref) isEqual:[NSNull null]])) //角度转弧度 #define DEGREES_TO_RADIANS(d) (d * M_PI / 180) //大于等于7.0的ios版本 #define iOS7_OR_LATER SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0") //大于等于8.0的ios版本 #define iOS8_OR_LATER SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0") //iOS6时，导航VC中view的起始高度 #define YH_HEIGHT (iOS7_OR_LATER ? 64:0) //获取系统时间戳 #define getCurentTime [NSString stringWithFormat:@"%ld", (long)[[NSDate date] timeIntervalSince1970]] //判断是真机还是模拟器 #if TARGET_OS_IPHONE //iPhone Device #endif #if TARGET_IPHONE_SIMULATOR //iPhone Simulator #endif //定义UIImage对象 #define IMAGE(A) [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:A ofType:nil]] //定义UIImage对象 #define ImageNamed(_pointer) [UIImage imageNamed:_pointer] //可拉伸的图片 #define ResizableImage(name,top,left,bottom,right) [[UIImage imageNamed:name] resizableImageWithCapInsets:UIEdgeInsetsMake(top,left,bottom,right)] #define ResizableImageWithMode(name,top,left,bottom,right,mode) [[UIImage imageNamed:name] resizableImageWithCapInsets:UIEdgeInsetsMake(top,left,bottom,right) resizingMode:mode] //方正黑体简体字体定义 #define FONT(F) [UIFont fontWithName:@"FZHTJW--GB1-0" size:F]

通知Notification相关的宏

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//系统Notification定义 #define TNCancelFavoriteProductNotification @"TNCancelFavoriteProductNotification" //取消收藏时 #define TNMarkFavoriteProductNotification @"TNMarkFavoriteProductNotification" //标记收藏时 #define kNotficationDownloadProgressChanged @"kNotficationDownloadProgressChanged" //下载进度变化 #define kNotificationPauseDownload @"kNotificationPauseDownload" //暂停下载 #define kNotificationStartDownload @"kNotificationStartDownload" //开始下载 #define kNotificationDownloadSuccess @"kNotificationDownloadSuccess" //下载成功 #define kNotificationDownloadFailed @"kNotificationDownloadFailed" //下载失败 #define kNotificationDownloadNewMagazine @"kNotificationDownloadNewMagazine"

服务端API接口的宏

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//接口名称相关 #ifdef DEBUG //Debug状态下的测试API #define API_BASE_URL_STRING @"http://boys.test.companydomain.com/api/" #else //Release状态下的线上API #define API_BASE_URL_STRING @"http://www.companydomain.com/api/" #endif //接口 #define GET_CONTENT_DETAIL @"channel/getContentDetail" //获取内容详情(含上一个和下一个) #define GET_COMMENT_LIST @"comment/getCommentList" //获取评论列表 #define COMMENT_LOGIN @"comment/login" //获取评论列表 #define COMMENT_PUBLISH @"comment/publish" //发布评论 #define COMMENT_DELETE @"comment/delComment" //删除评论 #define LOGINOUT @"common/logout" //登出

这些只是宏的基本用法,了解更多请点击