蜂窝相关

1.蜂窝权限状态获取

检查应用的蜂窝权限,可使用CTCellularData类

1. #import <CoreTelephony/CTCellularData.h>
2. 创建CTCellularData实例,监听蜂窝权限的变化,注意:这个CTCellularData实例需要设置成全局变量,在需要获取蜂窝权限状态的场景下使用这个对象

static CTCellularData *_cellularData;
- (void)addObserverForWWAN {
_cellularData = [CTCellularData new];
_cellularData.cellularDataRestrictionDidUpdateNotifier = ^(CTCellularDataRestrictedState state) {
        switch (state) {
            case kCTCellularDataRestricted:
                NSLog(@"蜂窝-变化-受限");
                break;
            case kCTCellularDataNotRestricted:
                NSLog(@"蜂窝-变化-不受限");
                break;
            default:
                NSLog(@"蜂窝-变化-未知");
                break;
        }
    };
}

当添加这个监听时,会立即执行一次上面这个block回调.

3. 获取当前蜂窝权限

+ (CTCellularDataRestrictedState)stateOfWWAN {
    return _cellularData.restrictedState;
}

2. 判断蜂窝是否开启

网上找了很久没找到对应的方法,只找到判断wifi开启状态的方法,这个判断蜂窝开启的方法由此演化得来(在iOS12,iOS10上面测试均有效)

1. 导入头文件
   #import <net/if.h>
#import <ifaddrs.h>
2. 关键代码

+ (BOOL)isWWANEnable {
    NSCountedSet *countedSet = [NSCountedSet new];
    struct ifaddrs *interfaces;
    if (!getifaddrs(&interfaces)) {
        for (struct ifaddrs *interface = interfaces; interface; interface = interface->ifa_next) {
            if ((interface->ifa_flags & IFF_UP) == IFF_UP) {
                NSString *ifa_name = [NSString stringWithUTF8String:interface->ifa_name];
                [countedSet addObject:ifa_name];
                NSLog(@"ifa_name: %s, sa_family: %d", interface->ifa_name, interface->ifa_addr->sa_family);
            }
        }
    }
    freeifaddrs(interfaces);  // 需要手动释放
    BOOL open = [countedSet countForObject:@"pdp_ip0"] > 1 ? YES : NO;
    NSLog(@"cellular open status: %@", open ? @"open" : @"unopen");
    return open;
}

当没有打开蜂窝时,pdp_ip0个数为0, 当打开蜂窝时,pdp_ip0个数有4个