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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,具体原因请看:http://www.jianshu.com/p/528897755dc8)
#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 LRRandomColor [UIColor colorWithRed:arc4random_uniform(256)/255.0 green:arc4random_uniform(256)/255.0 blue:arc4random_uniform(256)/255.0 alpha:1.0]
10.设置view的圆角边框
#define LRViewBorderRadius(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 kGetImage(imageName) [UIImage imageNamed:[NSString stringWithFormat:@"%@",imageName]]
12.获取当前语言
#define LRCurrentLanguage ([[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
// CES
#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
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原文地址：http://www.cnblogs.com/Free-Thinker/p/5908314.html
