iOS - 常用的宏定义
1.处理NSLog事件(开发者模式打印,发布者模式不打印)
#ifdef DEBUG #define NSLog(FORMAT, ...) fprintf(stderr,"%s:%d\t%s\n",[[[NSString stringWithUTF8String:__FILE__] lastPathComponent] UTF8String], __LINE__, [[NSString stringWithFormat:FORMAT, ##__VA_ARGS__] UTF8String]); #else #define NSLog(FORMAT, ...) nil #endif
2.在OC语言的情况下导入某些头文件
#ifdef __OBJC__ //导入头文件 #endif
3.处理循环引用问题(处理当前类对象)
#define WS(weakSelf) __weak __typeof(&*self)weakSelf = self;
4.获取屏幕宽高
#define ScreenWidth [[UIScreen mainScreen] bounds].size.width #define ScreenHeight [[UIScreen mainScreen] bounds].size.heigh
5.判断iOS8或更高系统版本(谨慎使用,floatValue是不靠谱的)
#define IOS8UP ([[UIDevice currentDevice].systemVersion floatValue] >= 8)
6.设置颜色RGB值
#define RGB(a,b,c) [UIColor colorWithRed:(a/255.0) green:(b/255.0) blue:(c/255.0) alpha:1.0]
7.设置颜色RGB值+透明度
#define RGBA(a,b,c,d) [UIColor colorWithRed:(a/255.0) green:(b/255.0) blue:(c/255.0) alpha:d]
8.支持横屏
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 80000 // 当前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
9.设置随机颜色
#define WRPRandomColor UIColor.init(red: CGFloat(arc4random() % 256)/255.0, green: CGFloat(arc4random() % 256)/255.0, blue: CGFloat(arc4random() % 256)/255.0, alpha: 1)
10.设置view的圆角边框
#define WRPViewBorderRadius(View, Radius, Width, Color)\\ [View.layer setCornerRadius:(Radius)];\ [View.layer setMasksToBounds:YES];\ [View.layer setBorderWidth:(Width)];\ [View.layer setBorderColor:[Color CGColor]]
11.获取图片资源
#define kImage(imageName) [UIImage imageNamed:[NSString stringWithFormat:@"%@",imageName]]
12.获取当前语言
#define WRPCurrentLanguage ([[NSLocale preferredLanguages] objectAtIndex:0])
13.判断当前的iPhone设备/系统版本
//判断是否为iPhone #define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) //判断是否为iPad #define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) //判断是否为ipod #define IS_IPOD ([[[UIDevice currentDevice] model] isEqualToString:@"iPod touch"]) // 判断是否为 iPhone 5SE #define iPhone5SE [[UIScreen mainScreen] bounds].size.width == 320.0f && [[UIScreen mainScreen] bounds].size.height == 568.0f // 判断是否为iPhone 6/6s #define iPhone6_6s [[UIScreen mainScreen] bounds].size.width == 375.0f && [[UIScreen mainScreen] bounds].size.height == 667.0f // 判断是否为iPhone 6Plus/6sPlus #define iPhone6Plus_6sPlus [[UIScreen mainScreen] bounds].size.width == 414.0f && [[UIScreen mainScreen] bounds].size.height == 736.0f //获取系统版本 #define IOS_SYSTEM_VERSION [[[UIDevice currentDevice] systemVersion] floatValue]
14.判断是真机还是模拟器
#if TARGET_OS_IPHONE//iPhone Device#endif#if TARGET_IPHONE_SIMULATOR//iPhone Simulator#endif
15.沙盒目录文件
//获取temp #define kPathTemp NSTemporaryDirectory() //获取沙盒 Document #define kPathDocument [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject] //获取沙盒 Cache #define kPathCache [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject]
16.宏与const 的使用
很多小伙伴在定义一个常量字符串,都会定义成一个宏,最典型的例子就是服务器的地址。在此所有用宏定义常量字符的小伙伴以后就用const来定义吧!为什么呢 ?我们看看:
宏的用法:一般字符串抽成宏,代码抽成宏使用。
const用法:一般常用的字符串定义成const(对于常量字符串苹果推荐我们使用const)。
宏与const区别:
1.编译时刻不同,宏属于预编译 ,const属于编译时刻
2.宏能定义代码,const不能,多个宏对于编译会相对时间较长,影响开发效率,调试过慢,const只会编译一次,缩短编译时间。
3.宏不会检查错误,const会检查错误
通过以上对比,我们以后在开发中如果定义一个常量字符串就用const,定义代码就用宏。
static NSString * const loginAccount = @"loginAccount";static NSString * const loginPassword = @"loginPassword";
17.单例化一个类
// // SynthesizeSingleton.h // WRP #ifndef SynthesizeSingleton_h #define SynthesizeSingleton_h //声明 #define DECLARE_SYNTHESIZE_SINGLETON_FOR_CLASS(classname) + (classname *)sharedInstance; //实现 #define IMPLEMENT_SYNTHESIZE_SINGLETON_FOR_CLASS(classname) static classname *shared##classname = nil; + (classname *)sharedInstance { @synchronized(self) { if (shared##classname == nil) { shared##classname = [[self alloc] init]; } } return shared##classname; } + (id)allocWithZone:(NSZone *)zone { @synchronized(self) { if (shared##classname == nil) { shared##classname = [super allocWithZone:zone]; return shared##classname; } } return nil; } - (id)copyWithZone:(NSZone *)zone { return self; }
使用方法:在你需要创建单例类的类的.h和.m文件中分别加入以下代码(首先导入以上代码所处的头文件)
DECLARE_SYNTHESIZE_SINGLETON_FOR_CLASS(LoginManager)(.h)声明 IMPLEMENT_SYNTHESIZE_SINGLETON_FOR_CLASS(LoginManager)(.m)实现
//系统版本 let iOS_VERSION = (UIDevice.currentDevice().systemVersion as NSString).doubleValue
//颜色设置方式一: func RGBA(R:CGFloat,G:CGFloat,B:CGFloat,A:CGFloat)->UIColor{ return UIColor(red: R/255.0, green: G/255.0, blue: B/255.0, alpha:A) } //颜色设置方式二: func colorWithHexString (hex: String) -> UIColor { var cString: String = hex.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()).uppercaseString if (cString.hasPrefix("#")) { cString = (cString as NSString).substringFromIndex(1) } if (cString.characters.count != 6) { return UIColor.redColor() } let rString = (cString as NSString).substringToIndex(2) let gString = ((cString as NSString).substringFromIndex(2) as NSString).substringToIndex(2) let bString = ((cString as NSString).substringFromIndex(4) as NSString).substringToIndex(2) var r:CUnsignedInt = 0, g:CUnsignedInt = 0, b:CUnsignedInt = 0 NSScanner(string: rString).scanHexInt(&r) NSScanner(string: gString).scanHexInt(&g) NSScanner(string: bString).scanHexInt(&b) return UIColor(red: CGFloat(r) / 255.0, green: CGFloat(g) / 255.0, blue: CGFloat(b) / 255.0, alpha: CGFloat(1)) }
//输出语句 func NSLog<T>(message: T, fileName: String = #file, methodName: String = #function, lineNumber: Int = #line){ #if DEBUG print("\(methodName)[\(lineNumber)]:\(message)") #endif }
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