如何将我的设备令牌（NSData）转换为NSString？

Question

如何将我的设备令牌（NSData）转换为NSString？

iosobjective-capple-push-notificationsnsstringnsdata

187

我正在实现推送通知。我想将我的APNS令牌保存为字符串。

- (void)application:(UIApplication *)application
didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)newDeviceToken
{
    NSString *tokenString = [NSString stringWithUTF8String:[newDeviceToken bytes]]; //[[NSString alloc]initWithData:newDeviceToken encoding:NSUTF8StringEncoding];
    NSLog(@"%@", tokenString);
    NSLog(@"%@", newDeviceToken);
}

第一行代码打印null。第二行打印了token。如何将我的newDeviceToken作为NSString获取？

- Sheehan Alam

第二个 NSLog 的输出是什么，即打印 newDeviceToken 的那个？ - rob mayoff

请勿重复：https://dev59.com/o3M_5IYBdhLWcg3wmkeu#35730103 - NiñoScript

do NOT use description - Fattie

31个回答

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- Nikolay Shubenkov · Answer 1

有没有一行解决方案？

Objective C

NSString *token = [[data.description componentsSeparatedByCharactersInSet:[[NSCharacterSet alphanumericCharacterSet]invertedSet]]componentsJoinedByString:@""];

快捷

let token = data.description.components(separatedBy: CharacterSet.alphanumerics.inverted).joined()

- Genja Grishin · Answer 2

NSString *tokenString = [[newDeviceToken description] stringByReplacingOccurrencesOfString:@"[<> ]" withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, [[newDeviceToken description] length])];

- Tony · Answer 3

Swift：

let tokenString = deviceToken.description.stringByReplacingOccurrencesOfString("[ <>]", withString: "", options: .RegularExpressionSearch, range: nil)

- LLIAJLbHOu · Answer 4

请使用优秀的类别！

// .h文件

@interface NSData (DeviceToken)

- (NSString *)stringDeviceToken;

@end

// .m文件

#import "NSData+DeviceToken.h"

@implementation NSData (DeviceToken)

- (NSString *)stringDeviceToken {
    const unsigned *deviceTokenBytes = [deviceToken bytes];
    NSString *deviceToken = [NSString stringWithFormat:@"%08x%08x%08x%08x%08x%08x%08x%08x",
                     ntohl(deviceTokenBytes[0]), ntohl(deviceTokenBytes[1]), ntohl(deviceTokenBytes[2]),
                     ntohl(deviceTokenBytes[3]), ntohl(deviceTokenBytes[4]), ntohl(deviceTokenBytes[5]),
                     ntohl(deviceTokenBytes[6]), ntohl(deviceTokenBytes[7])];
    return deviceToken;
}

@end

// AppDelegate.m

#import "NSData+DeviceToken.h"

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
    NSString *token = deviceToken.stringDeviceToken;
}

运行良好！

- Vinod Joshi · Answer 5

Swift

    // make sure that we have token for the devie on the App
    func application(application: UIApplication
        , didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {

            var tokenStr = deviceToken.description
            tokenStr = tokenStr.stringByReplacingOccurrencesOfString("<", withString: "", options: [], range: nil)
            tokenStr = tokenStr.stringByReplacingOccurrencesOfString(">", withString: "", options: [], range: nil)
            tokenStr = tokenStr.stringByReplacingOccurrencesOfString(" ", withString: "", options: [], range: nil)



            print("my token is: \(tokenStr)")

    }

- Mallikarjuna SB · Answer 6

-(NSString *)deviceTokenWithData:(NSData *)data
{
    NSString *deviceToken = [[data description] stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"<>"]];
    deviceToken = [deviceToken stringByReplacingOccurrencesOfString:@" " withString:@""];
    return deviceToken;
}

- Laksh Gandikota · Answer 7

Swift 3：

如果有人正在寻找在 Swift 3 中获取设备令牌的方法，请使用以下修改后的代码片段。

    let characterSet: CharacterSet = CharacterSet( charactersIn: "<>" )

    let deviceTokenString: String = (deviceToken.description as NSString)
        .trimmingCharacters(in: characterSet as CharacterSet)
        .replacingOccurrences(of: " ", with: "")
        .uppercased()

    print(deviceTokenString)

- Abdul Yasin · Answer 8

var token: String = ""
for i in 0..<deviceToken.count {
    token += String(format: "%02.2hhx", deviceToken[i] as CVarArg)
}

print(token)

- johnyu · Answer 9

这里@kulss发表的解决方案，虽然不够优雅但却简洁明了，在iOS 13中已经不再适用，因为description在NSData中的行为发生了变化。不过你仍然可以使用debugDescription。

NSString * deviceTokenString = [[[[deviceToken debugDescription]
                     stringByReplacingOccurrencesOfString: @"<" withString: @""] 
                    stringByReplacingOccurrencesOfString: @">" withString: @""] 
                   stringByReplacingOccurrencesOfString: @" " withString: @""];

- Naveed Ahmad · Answer 10

除非数据以null结尾，否则请尝试此方法。

NSString* newStr = [[NSString alloc] initWithData:newDeviceToken encoding:NSUTF8StringEncoding];