1.獲取屏幕寬度與高度(支持橫屏)

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 80000 // 當前Xcode支持iOS8及以上
#define SCREEN_WIDTH ([[UIScreen mainScreen] respondsToSelector:@selector(nativeBounds)]?[UIScreen mainScreen].nativeBounds.size.width/[UIScreen mainScreen].nativeScale:[UIScreen mainScreen].bounds.size.width)
#define SCREEN_HEIGHT ([[UIScreen mainScreen] respondsToSelector:@selector(nativeBounds)]?[UIScreen mainScreen].nativeBounds.size.height/[UIScreen mainScreen].nativeScale:[UIScreen mainScreen].bounds.size.height)
#define 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 SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width
#define SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height
#define SCREEN_SIZE [UIScreen mainScreen].bounds.size
#endif

2.設置RGB顏色/設置RGBA顏色

#define RGB(r,g,b) [UIColor colorWithRed:r/255.0f green:g/255.0f blue:b/255.0f alpha:1.0]
#define RGBA(r,g,b,a) [UIColor colorWithRed:r/255.0f green:g/255.0f blue:b/255.0f alpha:a]

3.設置隨機顏色

#define LRRandomColor [UIColor colorWithRed:arc4random_uniform(256)/255.0 green:arc4random_uniform(256)/255.0 blue:arc4random_uniform(256)/255.0 alpha:1.0]

4.獲取通知中心

#define XDNotificationCenter [NSNotificationCenter defaultCenter]

5.弱引用/強引用

#define XDWeakSelf(type) __weak typeof(type) weak##type = type;
#define XDStrongSelf(type) __strong typeof(type) type = weak##type;

6.獲取沙盒目錄文件

//獲取temp
#define kPathTemp NSTemporaryDirectory()
//獲取沙盒 Document
#define kPathDocument [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]
//獲取沙盒 Cache
#define kPathCache [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject]

7.自定義日志

#ifdef DEBUG
#define NSLog(...) NSLog(@"%s 第%d行 \n %@\n\n",__func__,__LINE__,[NSString stringWithFormat:__VA_ARGS__])
#else
#define NSLog(...)

#endif

8.判斷當前的iPhone設備/系統版本

//判斷是否為iPhone
#define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
#define IS_IPHONE ([[[UIDevice currentDevice] model] isEqualToString:@"iPhone"])

//判斷是否為iPad
#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
#define IS_IPAD ([[[UIDevice currentDevice] model] isEqualToString:@"iPad"])

//判斷是否為ipod#define IS_IPOD ([[[UIDevice currentDevice] model] isEqualToString:@"iPod touch"])

// 判斷是否為 iPhone 5S/SE
#define iPhone5SE [[UIScreen mainScreen] bounds].size.width == 320.0f && [[UIScreen mainScreen] bounds].size.height == 568.0f

// 判斷是否為iPhone 6/6s/7
#define iPhone6_6s [[UIScreen mainScreen] bounds].size.width == 375.0f && [[UIScreen mainScreen] bounds].size.height == 667.0f

// 判斷是否為iPhone 6Plus/6sPlus/7p
#define iPhone6Plus_6sPlus [[UIScreen mainScreen] bounds].size.width == 414.0f && [[UIScreen mainScreen] bounds].size.height == 736.0f

//獲取系統版本(這個方法不是特別靠譜)
#define IOS_SYSTEM_VERSION [[[UIDevice currentDevice] systemVersion] floatValue]

//建議使用這個方法
#define IOS_SYSTEM_STRING [[UIDevice currentDevice] systemVersion]

//判斷 iOS 8 或更高的系統版本
#define IOS_VERSION_8_OR_LATER (([[[UIDevice currentDevice] systemVersion] floatValue] >=8.0)? (YES):(NO))

9.判斷是真機還是模擬器

// 判斷是不是iOS系統，如果是iOS系統在真機和模擬器輸出都是YES
#if TARGET_OS_IPHONE #endif 

#if (TARGET_IPHONE_SIMULATOR)  
// 在模擬器的情況下
#else
 // 在真機情況下
#endif