获取设备的UUID

很多时候需要获取设备的UUID，比如在蓝牙交互时，需要获取服务和特征的UUID，那么如何获取设备的UUID呢？请见如下代码：

//
//  ViewController.m
//  获取UUID
//
//  Created by sleeping sun on 16/8/26.
//  Copyright © 2016年 sleeping sun. All rights reserved.
//

#import "ViewController.h"

#import <CoreFoundation/CoreFoundation.h>

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    NSLog(@"%@",[self uuid]);

}
- (NSString *)uuid {

    // 创建UUID
    CFUUIDRef myUUID = CFUUIDCreate(nil);

    // 把创建的UUID转换为字符串
    CFStringRef uuidString = CFUUIDCreateString(nil, myUUID);

    // 把C语言的字符串转为OC字符串
    NSString *result = (NSString *)CFBridgingRelease(CFStringCreateCopy(nil, uuidString));

    // 释放内存
    CFRelease(myUUID);
    CFRelease(uuidString);

    // 返回UUID
    return result;
}

@end