ios开发之常用宏的定义

有些时候，我们需要将代码简洁化，这样便于读代码。我们可以将一些不变的东东抽取出来，将变化的东西作为参数。定义为宏，这样在写的时候就简单多了。

下面例举了一些常用的宏定义和大家分享：

1. 判断设备的操作系统是不是ios7

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

2. 判断当前设备是不是iPhone5

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

3.获取当前屏幕的高度

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

4.获取当前屏幕的宽度

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

5.获得RGB颜色

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

6..自定义Log

#ifdef DEBUG

#define SMSLog(...) NSLog(__VA_ARGS__)

#else

#define SMSLog(...)

#endif

7.单例

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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.}