獲取設備的UUID

不少時候須要獲取設備的UUID，好比在藍牙交互時，須要獲取服務和特徵的UUID，那麼如何獲取設備的UUID呢？請見以下代碼：

//
//  ViewController.m
//  獲取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 {
    
    // 建立UUID
    CFUUIDRef myUUID = CFUUIDCreate(nil);

    // 把建立的UUID轉換爲字符串
    CFStringRef uuidString = CFUUIDCreateString(nil, myUUID);

    // 把C語言的字符串轉爲OC字符串
    NSString *result = (NSString *)CFBridgingRelease(CFStringCreateCopy(nil, uuidString));

    // 釋放內存
    CFRelease(myUUID);
    CFRelease(uuidString);
    
    // 返回UUID
    return result;
}

@end