iOS

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	%s
",[[[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

}