没有调用subscriberCellularProviderDidUpdateNotifier [英] subscriberCellularProviderDidUpdateNotifier never being called

问题描述

以下代码:

CTTelephonyNetworkInfo *info = [[CTTelephonyNetworkInfo alloc] init];
    info.subscriberCellularProviderDidUpdateNotifier = ^(CTCarrier *carrier) {
        dispatch_async(dispatch_get_main_queue(), ^{
            NSLog(@"User did change SIM");
        });
    };

内部:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

• 或者无论我将代码放在哪里进行测试.

无论我要用iSO 7.1.1在iPad Air Mini Wifi + 3G上更换多少张SIM卡，都不会调用该事件.

No matter how many sim card I'm replacing on iPad Air Mini Wifi+3G with iSO 7.1.1 the event never being called.

我在做什么错了?

推荐答案

您需要牢固引用CTTelephonyNetworkInfo对象.

Swift(iOS 12.0及更高版本):

在您的应用程序委托类中，为该对象声明一个名为telephonyNetworkInfo的属性，如下所示:

In your app delegate class, declare a property for this object called telephonyNetworkInfo like this:

let telephonyNetworkInfo = CTTelephonyNetworkInfo()

然后将其放入应用程序委托的didFinishLaunchingWithOptions方法中:

Then put this in your app delegate's didFinishLaunchingWithOptions method:

telephonyNetworkInfo.serviceSubscriberCellularProvidersDidUpdateNotifier = { [weak telephonyNetworkInfo] carrierIdentifier in
    let carrier: CTCarrier? = telephonyNetworkInfo?.serviceSubscriberCellularProviders?[carrierIdentifier]

    DispatchQueue.main.async {
        print("User did change SIM")
    }
}

Swift(在iOS 12.0之前):

在您的应用程序委托类中，为该对象声明一个名为telephonyNetworkInfo的属性，如下所示:

In your app delegate class, declare a property for this object called telephonyNetworkInfo like this:

let telephonyNetworkInfo = CTTelephonyNetworkInfo()

然后将其放入应用程序委托的didFinishLaunchingWithOptions方法中:

Then put this in your app delegate's didFinishLaunchingWithOptions method:

telephonyNetworkInfo.subscriberCellularProviderDidUpdateNotifier = { carrier in
    DispatchQueue.main.async {
        print("User did change SIM")
    }
}

Objective-C(在iOS 12.0之前):

在您的应用程序委托的@interface(或其类扩展名)中，为该对象声明一个名为telephonyNetworkInfo的属性，而不是以下内容:

In your app delegate's @interface (or its class extension), declare a property for this object called telephonyNetworkInfo and instead of this:

CTTelephonyNetworkInfo *info = [[CTTelephonyNetworkInfo alloc] init];

使用此:

self.telephonyNetworkInfo = [[CTTelephonyNetworkInfo alloc] init];

然后将其放入应用程序委托的didFinishLaunchingWithOptions方法中:

And then of course put this in your app delegate's didFinishLaunchingWithOptions method:

self.telephonyNetworkInfo.subscriberCellularProviderDidUpdateNotifier = ^(CTCarrier *carrier) {
    dispatch_async(dispatch_get_main_queue(), ^{
        NSLog(@"User did change SIM");
    });
};

这篇关于没有调用subscriberCellularProviderDidUpdateNotifier的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！