ios开发--常用宏定义(部分转)

ios开发--常用宏定义(部分转)
1、release时，屏蔽log
C代码
1. #if defined (DEBUG) && DEBUG == 1
3. #else
4. #define NSLog(...) {};
5. #endif
```
#if defined (DEBUG) && DEBUG == 1

#else
#define NSLog(...) {};
#endif
```
2、在主线程或在后台执行block
C代码
1. #define BACK(block) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), block)
2. #define MAIN(block) dispatch_async(dispatch_get_main_queue(),block)
```
#define BACK(block) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), block)
#define MAIN(block) dispatch_async(dispatch_get_main_queue(),block)
```
3、设备相关
C代码
1. #define isRetina ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size) : NO)
3. #define iPhone5 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 1136), [[UIScreen mainScreen] currentMode].size) : NO)
5. #define isPad (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
7. #define CurrentSystemVersion ([[UIDevice currentDevice] systemVersion])
9. #define CurrentLanguage ([[NSLocale preferredLanguages] objectAtIndex:0])
```
#define isRetina ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size) : NO)

#define iPhone5 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 1136), [[UIScreen mainScreen] currentMode].size) : NO)

#define isPad (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)

#define CurrentSystemVersion ([[UIDevice currentDevice] systemVersion])

#define CurrentLanguage ([[NSLocale preferredLanguages] objectAtIndex:0]) 
```
4、区分模拟器和真机
C代码
1. #if TARGET_OS_IPHONE
2. //iPhone Device
3. #endif
5. #if TARGET_IPHONE_SIMULATOR
6. //iPhone Simulator
7. #endif
```
#if TARGET_OS_IPHONE
//iPhone Device
#endif

#if TARGET_IPHONE_SIMULATOR
//iPhone Simulator
#endif
```
5、根据是否使用ARC做不同操作
C代码
1. #if __has_feature(objc_arc)
2. //compiling with ARC
3. #else
4. // compiling without ARC
5. #endif
相关阅读:
83. Remove Duplicates from Sorted List
141. Linked List Cycle
hdu1028 划分数
 XDU1019 阶乘因子的个数
 poj2773 容斥原理
 poj1091 容斥原理的应用
 poj1173 多重集组合数
 HDU 1465 错排问题
 poj 1496
复习之求一个数的约束之积模一个质数
原文地址：https://www.cnblogs.com/lovewx/p/4380833.html