宏的使用和一些宏的写法
转载至, http://my.oschina.net/u/868062/blog/204665
为什么xcode6没有自动创建pch文件呢？
简单地看：我们在写项目的时候，大部分宏定义，头文件导入都在这里，Xcode6去掉Precompile Prefix Header的主要原因可能在于Prefix Header大大的增加了Build的时间。没有了Prefix Header之后就要通过手动@import来手动导入头文件了，在失去了编程便利性的同时也降低了Build的时间。 具体原因
StackOverFlow上讨论的已经比较清晰了
StackOverFlow:为什么xcode6没有自动创建pch文件呢？
如何在Xcode6中添加pch（Precompile Prefix Header）？
1，Command+N，打开新建文件窗口：ios->other->PCH file，创建一个pch文件：“projectname-Prefix.pch”：
2，将building setting中的precompile header选项的路径添加“$(SRCROOT)/项目名称/pch文件名”（例如：$(SRCROOT)/Project/PrefixHeader.pch）
添加后，编译一下程序，如果有错误检查一下添加的路径是否正确。
3，将Precompile Prefix Header为YES，预编译后的pch文件会被缓存起来，可以提高编译速度
新建一个myViewController 在 预编译文件中引入并保存.
然后再ViewController里可以使用
这样就可以在xcode下使用预编译文件了
本文整理自：
http://blog.csdn.net/duxinfeng2010/article/details/9067947
http://hi.baidu.com/feng20068123/item/1935c6d022bf7513d78ed0d4
根据自己的习惯做了一些修改,简化。
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#ifndef MacroDefinition_h
#define MacroDefinition_h
//AppDelegate
#define APPDELEGATE [(AppDelegate*)[UIApplication sharedApplication] delegate]
//----------------------系统设备相关----------------------------
//获取设备屏幕尺寸
#define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width)
#define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height)//应用尺寸
#define APP_WIDTH [[UIScreen mainScreen]applicationFrame].size.width
#define APP_HEIGHT [[UIScreen mainScreen]applicationFrame].size.height
//获取系统版本
#define IOS_VERSION [[[UIDevice currentDevice] systemVersion] floatValue]
#define CurrentSystemVersion [[UIDevice currentDevice] systemVersion]
#define isIOS4 ([[[UIDevice currentDevice] systemVersion] intValue]==4)
#define isIOS5 ([[[UIDevice currentDevice] systemVersion] intValue]==5)
#define isIOS6 ([[[UIDevice currentDevice] systemVersion] intValue]==6)
#define isAfterIOS4 ([[[UIDevice currentDevice] systemVersion] intValue]>4)
#define isAfterIOS5 ([[[UIDevice currentDevice] systemVersion] intValue]>5)
#define isAfterIOS6 ([[[UIDevice currentDevice] systemVersion] intValue]>6)
//获取当前语言
#define CurrentLanguage ([[NSLocale preferredLanguages] objectAtIndex:0])
//判断是否 Retina屏、设备是否%fhone 5、是否是iPad
#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)
//判断是真机还是模拟器
#if TARGET_OS_IPHONE
//iPhone Device
#endif
#if TARGET_IPHONE_SIMULATOR
//iPhone Simulator
#endif
//----------------------系统设备相关----------------------------
//----------------------内存相关----------------------------
//使用ARC和不使用ARC
#if __has_feature(objc_arc)
//compiling with ARC
#else
// compiling without ARC
#endif
//释放一个对象
#define SAFE_DELETE(P) if(P) { [P release], P = nil; }
#define SAFE_RELEASE(x) [x release];x=nil
//----------------------内存相关----------------------------
//----------------------图片相关----------------------------
//读取本地图片
#define LOADIMAGE(file,ext) [UIImage imageWithContentsOfFile:[[NSBundle mainBundle]pathForResource:file ofType:ext]]
//定义UIImage对象
#define IMAGE(A) [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:A ofType:nil]]
//定义UIImage对象
#define ImageNamed(_pointer) [UIImage imageNamed:_pointer]
//可拉伸的图片
#define ResizableImage(name,top,left,bottom,right) [[UIImage imageNamed:name] resizableImageWithCapInsets:UIEdgeInsetsMake(top,left,bottom,right)]
#define ResizableImageWithMode(name,top,left,bottom,right,mode) [[UIImage imageNamed:name] resizableImageWithCapInsets:UIEdgeInsetsMake(top,left,bottom,right) resizingMode:mode]
//建议使用前两种宏定义,性能高于后者
//----------------------图片相关----------------------------
//----------------------颜色相关---------------------------
// rgb颜色转换（16进制->10进制）
#define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]
// 获取RGB颜色
#define RGBA(r,g,b,a) [UIColor colorWithRed:r/255.0f green:g/255.0f blue:b/255.0f alpha:a]
#define RGB(r,g,b) RGBA(r,g,b,1.0f)
//背景色
#define BACKGROUND_COLOR [UIColor colorWithRed:242.0/255.0 green:236.0/255.0 blue:231.0/255.0 alpha:1.0]
//清除背景色
#define CLEARCOLOR [UIColor clearColor]
//----------------------颜色相关--------------------------
//----------------------其他----------------------------
//方正黑体简体字体定义
#define FONT(F) [UIFont fontWithName:@"FZHTJW--GB1-0" size:F]
//file
//读取文件的文本内容,默认编码为UTF-8
#define FileString(name,ext) [[NSString alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:(name) ofType:(ext)] encoding:NSUTF8StringEncoding error:nil]
#define FileDictionary(name,ext) [[NSDictionary alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:(name) ofType:(ext)]]
#define FileArray(name,ext) [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:(name) ofType:(ext)]]
//G－C－D
#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)
//Alert
#define ALERT(msg) [[[UIAlertView alloc] initWithTitle:nil message:msg delegate:nil cancelButtonTitle:@"ok" otherButtonTitles:nil] show]
//由角度获取弧度 有弧度获取角度
#define degreesToRadian(x) (M_PI * (x) / 180.0)
#define radianToDegrees(radian) (radian*180.0)/(M_PI)
//----------------------其他-------------------------------
//----------------------视图相关----------------------------
//设置需要粘贴的文字或图片
#define PasteString(string) [[UIPasteboard generalPasteboard] setString:string];
#define PasteImage(image) [[UIPasteboard generalPasteboard] setImage:image];
//得到视图的left top的X,Y坐标点
#define VIEW_TX(view) (view.frame.origin.x)
#define VIEW_TY(view) (view.frame.origin.y)
//得到视图的right bottom的X,Y坐标点
#define VIEW_BX(view) (view.frame.origin.x + view.frame.size.width)
#define VIEW_BY(view) (view.frame.origin.y + view.frame.size.height )
//得到视图的尺寸:宽度、高度
#define VIEW_W(view) (view.frame.size.width)
#define VIEW_H(view) (view.frame.size.height)
//得到frame的X,Y坐标点
#define FRAME_TX(frame) (frame.origin.x)
#define FRAME_TY(frame) (frame.origin.y)
//得到frame的宽度、高度
#define FRAME_W(frame) (frame.size.width)
#define FRAME_H(frame) (frame.size.height)
//----------------------视图相关----------------------------
//---------------------打印日志--------------------------
//Debug模式下打印日志,当前行,函数名
#if DEBUG
#define DLog(FORMAT, ...) fprintf(stderr,"\nfunction:%s line:%d content:%s\n", __FUNCTION__, __LINE__, [[NSString stringWithFormat:FORMAT, ##__VA_ARGS__] UTF8String]);
#else
#define NSLog(FORMAT, ...) nil
#endif
//Debug模式下打印日志,当前行,函数名 并弹出一个警告
#ifdef DEBUG
# define WDLog(fmt, ...) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:@"%s\n [Line %d] ", __PRETTY_FUNCTION__, __LINE__] message:[NSString stringWithFormat:fmt, ##__VA_ARGS__] delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil]; [alert show]; }
#else
# define NSLog(...)
#endif
//打印Frame
#define LogFrame(frame) NSLog(@"frame[X=%.1f,Y=%.1f,W=%.1f,H=%.1f",frame.origin.x,frame.origin.y,frame.size.width,frame.size.height)
//打印Point
#define LogPoint(point) NSLog(@"Point[X=%.1f,Y=%.1f]",point.x,point.y)
//---------------------打印日志--------------------------
#endif
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开源宏定义MacroDefinition.h 下载地址:https://github.com/XFZLDXF/Macro