【IOS工具类】获得设备唯一标识（兼容IOS5，6，7）

UIDevice+IdentifierAddition.h：

#import <Foundation/Foundation.h>


@interface UIDevice (IdentifierAddition)

- (NSString *) uniqueDeviceIdentifier;

@end

UIDevice+IdentifierAddition.m

NSString+MD5.h：

#import <Foundation/Foundation.h>

@interface NSString (MD5)

+(NSString *)md5:(NSString *)str;
@end


NSString+MD5.m：





用法：

[[UIDevice currentDevice]uniqueDeviceIdentifier];