我找不到任何正式的方式来获得一个UUID字符串返回了CBUUID的。 这些的UUID可以是2首或16个字节长。
我们的目标是存储CBUUIDs在某处作为一个字符串文件,然后用[CBUUID UUIDWithString:]复活等。这里是我到目前为止所。
// returns a simple 4 byte string for 16bit uuids, 128 bit uuids are in standard 8-4-4-4-12 format
// the resulting string can be passed into [CBUUID UUIDWithString:]
+(NSString*)CBUUIDToString:(CBUUID*)cbuuid;
{
NSData* data = cbuuid.data;
if ([data length] == 2)
{
const unsigned char *tokenBytes = [data bytes];
return [NSString stringWithFormat:@"%02x%02x", tokenBytes[0], tokenBytes[1]];
}
else if ([data length] == 16)
{
NSUUID* nsuuid = [[NSUUID alloc] initWithUUIDBytes:[data bytes]];
return [nsuuid UUIDString];
}
return [cbuuid description]; // an error?
}
Answer 1:
我七拼八凑以下类别为CBUUID做到这一点:
@interface CBUUID (StringExtraction)
- (NSString *)representativeString;
@end
@implementation CBUUID (StringExtraction)
- (NSString *)representativeString;
{
NSData *data = [self data];
NSUInteger bytesToConvert = [data length];
const unsigned char *uuidBytes = [data bytes];
NSMutableString *outputString = [NSMutableString stringWithCapacity:16];
for (NSUInteger currentByteIndex = 0; currentByteIndex < bytesToConvert; currentByteIndex++)
{
switch (currentByteIndex)
{
case 3:
case 5:
case 7:
case 9:[outputString appendFormat:@"%02x-", uuidBytes[currentByteIndex]]; break;
default:[outputString appendFormat:@"%02x", uuidBytes[currentByteIndex]];
}
}
return outputString;
}
@end
对于这个输入:
NSLog(@"UUID string: %@", [[CBUUID UUIDWithString:@"0bd51666-e7cb-469b-8e4d-2742f1ba77cc"] representativeString]);
NSLog(@"UUID string2: %@", [[CBUUID UUIDWithString:@"1800"] representativeString]);
它产生以下输出:
UUID string: 0bd51666-e7cb-469b-8e4d-2742f1ba77cc
UUID string2: 1800
并保留为16点字节的UUID的适当的连字,同时支持简单的2字节的UUID。
Answer 2:
所有那些说CBUUID是免费电话与CFUUIDRef桥,事实并非如此。
CBUUID * foo = [CBUUID UUIDWithString:CBUUIDCharacteristicExtendedPropertiesString];
CFStringRef fooBar = CFUUIDCreateString(NULL, (__bridge CFUUIDRef)foo);
if (![CBUUIDCharacteristicExtendedPropertiesString isEqualToString:(__bridge NSString *)fooBar])
NSLog(@"fubar!");
它不崩溃,但你得到垃圾出。 它可能是唯一标识垃圾,但它不能往返式操作。
PS:这并没有为注释工作,因为SO评论奇怪不允许代码格式化。
Answer 3:
的iOS 7.1(测试版昨日公布,13年11月18日)介绍了以下属性CBUUID
:
@property(nonatomic, readonly) NSString *UUIDString
的UUID表示为一个字符串。 (只读)
从CBUUID类参考 。
另外值得一提的是,用于比较的UUID字符串用CBUUID
,这个工程:
if ([cbuuidInQuestion isEqual:[CBUUID UUIDWithString:@"1234-5678-9012-1234"]]) {
// isEqual tests for "the same UUID"
// == tests for "the same CBUUID object"
}
Answer 4:
我知道这是已有7月起有人问和回答,但是...... CBUUID
是“免费电话桥接”到CFUUID
和转换的最简单的方法是
//CBUUID* uuid = descr.UUID;
NSString* str = CFUUIDCreateString(nil, uuid);
Answer 5:
这是布拉德·拉尔森的回答迅速扩展:
import CoreBluetooth
extension CBUUID {
func representativeString() -> String {
let data = self.data
let bytesToConvert = data.length
let uuidBytes = UnsafePointer<CUnsignedChar>(data.bytes)
var outputString = String()
for currentByteIndex in 0..<bytesToConvert {
switch currentByteIndex {
case 3,5,7,9:
outputString += String(format: "%02x-",uuidBytes[currentByteIndex])
default:
outputString += String(format: "%02x",uuidBytes[currentByteIndex])
}
}
return outputString
}
}
从iOS的7.1 UUIDString
财产是有,但具体的iOS7,上面的扩展名是不错的选择。
Answer 6:
有一个在客观C和斯威夫特本地方法,这是很简单的方法。
NSString *str = characteristic.UUID.UUIDstring;
雨燕与语言链接同样的事情库- > https://developer.apple.com/documentation/corebluetooth/cbuuid/1518742-uuidstring?language=objc
Answer 7:
布拉德的答案做的工作,但解决方案可能是简单的(尽管可能不是更有效)使用NSUUID
类:
// CBUUID+ToString.h
#import <CoreBluetooth/CoreBluetooth.h>
@interface CBUUID (ToString)
- (NSString *)toString;
@end
// CBUUID+ToString.m
#import "CBUUID+ToString.h"
@implementation CBUUID (ToString)
- (NSString *)toString {
if ([self respondsToSelector:@selector(UUIDString)]) {
return [self UUIDString]; // Available since iOS 7.1
} else {
return [[[NSUUID alloc] initWithUUIDBytes:[[self data] bytes]] UUIDString]; // iOS 6.0+
}
}
@end
Answer 8:
下面曾为我没有任何错误:
NSString *str = [[NSString alloc] initWithFormat:@"%@", CFUUIDCreateString(nil, peripheral.UUID) ];
文章来源: How to turn CBUUID into string