宏定義與常量的區(qū)別

宏：只是在預(yù)處理器里進行文本替換，不做任何類型檢查，宏能定義代碼，const不能，多個宏編譯時間相對較長，影響開發(fā)效率，調(diào)試過慢，const只會編譯一次，縮短編譯時間。
所以在使用的時候，最好把代碼和一些基本數(shù)據(jù)類型如int抽成宏。
而對于常量字符串使用const，蘋果也是這樣使用的。

下面總結(jié)一下一些常用的宏定義。
1.獲取主屏幕和屏幕寬度與高度

OC

#define SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width #define SCREENH_HEIGHT [UIScreen mainScreen].bounds.size.height #define MAIN_SCREEN [UIScreen mainScreen]

Swift

let SCREEN_WIDTH = UIScreen.mainScreen().bounds.width let SCREENH_HEIGHT = UIScreen.mainScreen().bounds.height let MAIN_SCREEN = UIScreen.mainScreen()

如果支持橫屏可以用下面的宏:
OC

#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 SCREENH_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 SCREENH_HEIGHT [UIScreen mainScreen].bounds.size.height #define SCREEN_SIZE [UIScreen mainScreen].bounds.size #endif

Swift

#if (__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 80000 // 當前Xcode支持iOS8及以上 let SCREEN_WIDTH = (MAIN_SCREEN.respondsToSelector(#selector(UIScreen.nativeBounds)) ? MAIN_SCREEN.nativeBounds.width/MAIN_SCREEN.nativeScale : MAIN_SCREEN.bounds.width) let SCREENH_HEIGHT = (MAIN_SCREEN.respondsToSelector(#selector(UIScreen.nativeBounds)) ? MAIN_SCREEN.nativeBounds.height/MAIN_SCREEN.nativeScale : MAIN_SCREEN.bounds.height) let SCREEN_SIZE = (MAIN_SCREEN.respondsToSelector(#selector(UIScreen.nativeBounds)) ? CGSizeMake(SCREEN_WIDTH, SCREENH_HEIGHT) : MAIN_SCREEN.bounds.size) #else let SCREEN_WIDTH = UIScreen.mainScreen().bounds.width let SCREENH_HEIGHT = UIScreen.mainScreen().bounds.height let SCREEN_SIZE = UIScreen.mainScreen().bounds.size #endif

2.獲取通知中心和UserDefaults

OC

#define DENotificationCenter [NSNotificationCenter defaultCenter] #define SDUserDefaults [NSUserDefaults standardUserDefaults]

Swift

let DENotificationCenter = NSNotificationCenter.defaultCenter() let SDUserDefaults = NSUserDefaults.standardUserDefaults()

3.設(shè)置隨機顏色

OC

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

Swift

let GRandomColor = UIColor(red: CGFloat(arc4random_uniform(256)/255), green: CGFloat(arc4random_uniform(256)/255), blue: CGFloat(arc4random_uniform(256)/255), alpha: 1)

4.設(shè)置RGB顏色/設(shè)置RGBA顏色

OC

#define RGBColor(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0] #define RGBAColor(r, g, b, a) [UIColor colorWithRed:(r)/255.0 green:(r)/255.0 blue:(r)/255.0 alpha:a] // clear背景顏色 #define GClearColor [UIColor clearColor]

Swift

func colorWith(red red : CGFloat,green : CGFloat,blue:CGFloat) -> UIColor {return UIColor(red: red/255.0, green: green/255.0, blue: blue/255.0, alpha: 1) } func colorWith(red red : CGFloat,green : CGFloat,blue:CGFloat,a:CGFloat) -> UIColor { return UIColor(red: red/255.0, green: green/255.0, blue: blue/255.0, alpha: a) }

5.自定義高效率的 NSLog

項目開發(fā)中，我們會在許多地方加上Log，但是發(fā)布的時候又不想用這些Log，我們也不可能一個一個的刪除，所以自定義Log是必然的！
OC

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

Swift

func debugLog<T>(message: T,file: String = #file,method: String = #function,line: Int = #line) {#if DEBUGprint("\((file as NSString).lastPathComponent)[\(line)], \(method): \(message)") #endif }

6.弱引用/強引用

#define LRWeakSelf(type) __weak typeof(type) weak##type = type; #define LRStrongSelf(type) __strong typeof(type) type = weak##type;

7.由角度轉(zhuǎn)換弧度 由弧度轉(zhuǎn)換角度

#define RadianFrom(degree) (M_PI * (degree) / 180.0) #define DegreeFrom(radian) (radian*180.0)/(M_PI)

8.獲取UIImage

#define GUIImageFor(imageName) [UIImage imageNamed:[NSString stringWithFormat:@"%@",imageName]]

9.獲取當前語言

#define LRCurrentLanguage ([[NSLocale preferredLanguages] objectAtIndex:0])

10.使用 ARC 和 MRC

#if __has_feature(objc_arc) // ARC #else // MRC #endif

11.判斷當前的iPhone設(shè)備/系統(tǒng)版本

OC

//判斷是否為iPhone #define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) //判斷是否為iPad #define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) //判斷是否為ipod #define IS_IPOD ([[[UIDevice currentDevice] model] isEqualToString:@"iPod touch"]) // 判斷是否為 iPhone 5SE #define iPhone5SE [[UIScreen mainScreen] bounds].size.width == 320.0f && [[UIScreen mainScreen] bounds].size.height == 568.0f // 判斷是否為iPhone 6/6s #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 #define iPhone6Plus_6sPlus [[UIScreen mainScreen] bounds].size.width == 414.0f && [[UIScreen mainScreen] bounds].size.height == 736.0f //獲取系統(tǒng)版本 #define IOS_SYSTEM_VERSION [[[UIDevice currentDevice] systemVersion] floatValue] //判斷 iOS 8 或更高的系統(tǒng)版本 #define IOS_VERSION_8_OR_LATER (([[[UIDevice currentDevice] systemVersion] floatValue] >=8.0)? (YES):(NO))

Swift

//判斷是否為iPhone let IS_IPHONE = (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiom.Phone) //判斷是否為iPad let IS_IPAD = (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiom.Pad) //判斷是否為ipod let IS_IPOD = (UIDevice.currentDevice().model == "iPod touch") // 判斷是否為 iPhone 5SE let is_iPhone5SE = (UIScreen.mainScreen().bounds.width == 320.0 && UIScreen.mainScreen().bounds.height == 568.0) // 判斷是否為iPhone 6/6s let is_iPhone6Or6s = (UIScreen.mainScreen().bounds.width == 375.0 && UIScreen.mainScreen().bounds.height == 667.0) // 判斷是否為iPhone 6Plus/6sPlus let is_iPhone6PlusOr6sPlus = (UIScreen.mainScreen().bounds.width == 414.0 && UIScreen.mainScreen().bounds.height == 736.0) //獲取系統(tǒng)版本 let IOS_SYSTEM_VERSION = Float(UIDevice.currentDevice().systemVersion)! //判斷 iOS 8 或更高的系統(tǒng)版本 let IS_IOS_VERSION_8_OR_LATER = ((IOS_SYSTEM_VERSION >= 8.0) ? (true):(false))

12.判斷是真機還是模擬器

#if TARGET_OS_IPHONE //iPhone Device #endif #if TARGET_IPHONE_SIMULATOR //iPhone Simulator #endif

13.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]

14.GCD
OC

//GCD - 只執(zhí)行一次 #define kDISPATCH_ONCE(onceBlock) static dispatch_once_t onceToken; dispatch_once(&onceToken, onceBlock); //GCD - 在Main線程上運行 #define kDISPATCH_MAIN_THREAD(mainQueueBlock) dispatch_async(dispatch_get_main_queue(), mainQueueBlock); //GCD - 開啟異步線程 #define kDISPATCH_GLOBAL_QUEUE_DEFAULT(globalQueueBlock) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), globalQueueBlocl);

Swift

func kDISPATCH_ONCE(onceBlock : dispatch_block_t) { var onceToken = dispatch_once_t() dispatch_once(&onceToken, onceBlock) } func kDISPATCH_MAIN_THREAD(mainQueueBlock : dispatch_block_t) { dispatch_async(dispatch_get_main_queue(), mainQueueBlock) }

鍵值提示

#define GKeyPath(objc,keyPath) @(((void)objc.keyPath,#keyPath))

//棄用的方法后綴

#define TEMPORARILY_ABANDONED __attribute__((deprecated))

轉(zhuǎn)載于:https://www.cnblogs.com/Free-Thinker/p/11175641.html

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