小编Sai*_*mar的帖子

我使用以下代码进行电话号码验证.但我收到以下错误.我无法继续前进.帮助我们推进它.

class PhoneNumberValidation: Validation {
    let PHONE_REGEX = "^\\d{3}-\\d{3}-\\d{4}$"

    func validate(value: String) -> (Bool, ValidationErrorType) {
        if let phoneTest = NSPredicate(format: "SELF MATCHES %@", PHONE_REGEX) {
            if phoneTest.evaluateWithObject(value) {
                return (true, .NoError)
            }
            return (false, .PhoneNumber)
        }
        return (false, .PhoneNumber)
    }
}

错误:swift:15:28:条件绑定中的绑定值必须是Optional类型

为了找到信号强度,我在我的项目中进行了以下更改,因此如果信号强度良好,我将提出API请求.如果不好,我们会提示用户关于互联网连接.但是此代码仅适用于单个SIM卡设备,不适用于双卡而不能获得辅助SIM卡的"ASU"和"dBm"值.任何人都知道如何检测双卡的信号强度.

我的项目minSdkVersion = 16,targetSdkVersion = 23

您的参考代码.

Mainactivity.java

Thread t1 = new Thread()
{
    public void run()
    {
        Intent service1 = new Intent(HomeScreen.this, SignalService.class);
        startService(service1);
    }
};

SignalService.Java

public class SignalService extends Service {

    private static final String TAG = "SignalService" ;
    private TelephonyManager mTelephonyManager;
    private PhoneStateListener mPhoneStateListener;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {

        mTelephonyManager = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);

        mPhoneStateListener = new PhoneStateListener(){

            public static final int INVALID = Integer.MAX_VALUE;

            public int signalStrengthDbm …