iOS - DeviceToken 解析

NSString *token = [[deviceToken description] stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"<>"]];
token = [token stringByReplacingOccurrencesOfString:@" " withString:@""];

let dataStr = NSData(data: deviceToken)
let token = dataStr.description
    .replacingOccurrences(of: "<", with: "")
    .replacingOccurrences(of: ">", with: "")
    .replacingOccurrences(of: " ", with: "")
    
//当然下面这种方式性能更好：
let charactersToRemove: Set<Character> = ["<", ">", " "]
let tokenNew = dataStr.description.removeAll(where: charactersToRemove.contains)

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
    if (![deviceToken isKindOfClass:[NSData class]]) return;
    const unsigned *tokenBytes = [deviceToken bytes];
    NSString *hexToken = [NSString stringWithFormat:@"%08x%08x%08x%08x%08x%08x%08x%08x",
                          ntohl(tokenBytes[0]), ntohl(tokenBytes[1]), ntohl(tokenBytes[2]),
                          ntohl(tokenBytes[3]), ntohl(tokenBytes[4]), ntohl(tokenBytes[5]),
                          ntohl(tokenBytes[6]), ntohl(tokenBytes[7])];
    NSLog(@"deviceToken:%@",hexToken);
}

if (![deviceToken isKindOfClass:[NSData class]]) return;
NSMutableString *valueString = [NSMutableString string];
const unsigned *tokenBytes = [deviceToken bytes];
NSInteger count = deviceToken.length;
for (int i = 0; i < count; i++) {
    [valueString appendFormat:@"%02x", tokenBytes[i]&0x000000FF];
}

//这个也可改成for in 循环获取

let token = deviceToken.map{String(format: "%02.2hhx", $0)}.joined()

let token = deviceToken.map{String(format: "%02x", $0)}.joined()

let token = deviceToken.reduce("", {$0 + String(format: "%02x", $1)}) //比上面解析速度快