iOS 开发中一些常用的宏
1.获取屏幕宽度与高度
```
#define SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width
#define SCREENH_HEIGHT [UIScreen mainScreen].bounds.size.height
```
2.获取通知中心
```
#define JKNotificationCenter [NSNotificationCenter defaultCenter]
```
3.设置随机颜色
```
#define JKRandomColor [UIColor colorWithRed:arc4random_uniform(256)/255.0 green:arc4random_uniform(256)/255.0 blue:arc4random_uniform(256)/255.0 alpha:1.0]
```
4.设置RGB颜色/设置RGBA颜色
```
#define JKRGBColor(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0]
#define JKRGBAColor(r, g, b, a) [UIColor colorWithRed:(r)/255.0 green:(r)/255.0 blue:(r)/255.0 alpha:a]
```
// clear背景颜色
```
#define JKClearColor [UIColor clearColor]
```
5.自定义高效率的 NSLog
```
#ifdef DEBUG
#define JKLog(...) NSLog(@"%s 第%d行 \n %@\n\n",__func__,__LINE__,[NSString stringWithFormat:__VA_ARGS__])
#else
#define JKLog(...)
#endif
```
6.弱引用/强引用
```
#define JKWeakSelf(type) __weak typeof(type) weak##type = type;
#define JKStrongSelf(type) __strong typeof(type) type = weak##type;
```
7.设置 view 圆角和边框
```
#define LRViewBorderRadius(View, Radius, Width, Color)\
\
[View.layer setCornerRadius:(Radius)];\
[View.layer setMasksToBounds:YES];\
[View.layer setBorderWidth:(Width)];\
[View.layer setBorderColor:[Color CGColor]]
```
8.GCD 的宏定义
```
//GCD - 一次性执行
#define kDISPATCH_ONCE_BLOCK(onceBlock) static dispatch_once_t onceToken; dispatch_once(&onceToken, onceBlock);
//GCD - 在Main线程上运行
#define kDISPATCH_MAIN_THREAD(mainQueueBlock) dispatch_async(dispatch_get_main_queue(), mainQueueBlock);
//GCD - 开启异步线程
#define kDISPATCH_GLOBAL_QUEUE_DEFAULT(globalQueueBlock) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), globalQueueBlocl);
```
