IOS 常用的宏定义(一)

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1.设备的属性

#define isRetina ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size) : NO)

#defineiPhone5 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 1136), [[UIScreen mainScreen] currentMode].size) : NO)

#defineisPad (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)

#define CurrentSystemVersion ([[UIDevice currentDevice] systemVersion])

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

#define SAFE_RELEASE(x) [x release];x=nil#define IOS_VERSION [[[UIDevice currentDevice] systemVersion] floatValue]

2.GCD

#defineBACK(block) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), block)
#defineMAIN(block) dispatch_async(dispatch_get_main_queue(),block)

3.ARC

#if __has_feature(objc_arc)
//compiling with ARC
#else
// compiling without ARC
#endif

4.判断是模拟器或者真机

#if TARGET_IPHONE_SIMULATOR

label.text =@"iphoneSimulator" ;

#elif TARGET_OS_IPHONE

label.text =@"iphoneDevice" ;

#endif

5.控件

#defineBARBUTTON(TITLE, SELECTOR) [[[UIBarButtonItem alloc] initWithTitle:TITLEstyle:UIBarButtonItemStylePlain target:self action:SELECTOR] autorelease]

使用方法：

self.navigationItem.rightBarButtonItem =BARBUTTON(@"Action",@selector(action:));

6.function

#define LOADIMAGE(file,ext) [UIImage imageWithContentsOfFile:[[NSBundle mainBundle]pathForResource:file ofType:ext]]

#define VIEWWITHTAG(_OBJECT, _TAG) [_OBJECT viewWithTag : _TAG]