宏定义记录重点

1.NSLog宏定义:

很多情况下我们会对这行log的所在的文件位置方法什么的会比较关心。在每次NSLog里都手动加上方法名字和位置信息什么的无疑是个笨办法，而如果一个工程里已经有很多NSLog的调用了，一个一个手动去改的话无疑也是噩梦。我们通过宏，可以很简单地完成对NSLog原生行为的改进，优雅，高效。只需要在预编译的pch文件中加上

//A better version of NSLog
#define NSLog(format, ...) do {                                                                          
                             fprintf(stderr, "<%s : %d> %s
",                                           
                             [[[NSString stringWithUTF8String:__FILE__] lastPathComponent] UTF8String],  
                             __LINE__, __func__);                                                        
                             (NSLog)((format), ##__VA_ARGS__);                                           
                             fprintf(stderr, "-------
");                                               
                           } while (0)

2.Rect, Size, Point:

#define NSLogRect(rect) NSLog(@"%s x:%.4f, y:%.4f, w:%.4f, h:%.4f", #rect, rect.origin.x, rect.origin.y, rect.size.width, rect.size.height)
#define NSLogSize(size) NSLog(@"%s w:%.4f, h:%.4f", #size, size.width, size.height)
#define NSLogPoint(point) NSLog(@"%s x:%.4f, y:%.4f", #point, point.x, point.y)

3.以下是我项目中使用到的一些宏定义:

#ifndef Macros_Utils_h
#define Macros_Utils_h

// Thread
#define MKAssertMainThread() NSAssert([NSThread isMainThread], @"这个方法必须在主线程调用");
#define MKAssertOtherThread() NSAssert(![NSThread isMainThread], @"这个方法必须在子线程调用");

// KVO KVC
#define keyPath(obj, attr) @(((void)obj.attr, #attr))
#define keyPathWithSELName(sltName) NSStringFromSelector(@selector(sltName)) // property/selectorName -> keyPath

// NSLog
#if defined(DEBUG) || defined(_DEBUG)
#define NSLog(format, ...) 
do {
fprintf(stderr, "<%s : %d> %s
", [[[NSString stringWithUTF8String:__FILE__] lastPathComponent] UTF8String], __LINE__, __func__); 
(NSLog)((format), ##__VA_ARGS__); 
fprintf(stderr, "-------
"); 
} while (0)
#else
#define NSLog(...)
#endif

// iOS 版本
#define MKSystemVersionGreaterOrEqualThan(version) ([[[UIDevice currentDevice] systemVersion] floatValue] >= version)
#define IOS7_OR_LATER MKSystemVersionGreaterOrEqualThan(7.0)
#define IOS8_OR_LATER MKSystemVersionGreaterOrEqualThan(8.0)
#define IOS9_OR_LATER MKSystemVersionGreaterOrEqualThan(9.0)
#define IOS8_1_OR_LATER MKSystemVersionGreaterOrEqualThan(8.1)
#define MKSystemVersionLowerOrEqualThan(version) ([[[UIDevice currentDevice] systemVersion] floatValue] < version)
#define IOS6_EARLY MKSystemVersionLowerOrEqualThan(6.0)

// safe access
#define isNilOrNull(obj) (obj == nil || [obj isEqual:[NSNull null]])
#define isClassEqualNil(clazz) (clazz == Nil)
#define NULL_POINTER NULL

// bundle
#define DOCUMENT_FOLDER ([NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject])
#define bundlePathWithName(name) [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:name]
#define bundleWithName(name) [NSBundle bundleWithPath:bundlePathWithName(name)]

// 判断string是否为空 nil 或者 @""；
#define IsNilString(__String) (__String==nil || [__String isEqualToString:@""] || [[__String stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] isEqualToString:@""])


#endif /* Macros_Utils_h */

暂时记录这么多,后续补充!