获取设备信号强度

Question

我正在尝试以dBm为单位获得运营商，wifi, 3g和4g的信号强度。

我目前正在使用此代码从状态栏获得运营商和wifi，我想知道是否有另一种方法或更好的方法?还有，我怎么才能买到3g和4g呢?

UIApplication *app = [UIApplication sharedApplication];
NSArray *subviews = [[[app valueForKey:@"statusBar"] valueForKey:@"foregroundView"] subviews];
NSString *dataNetworkItemView = nil;
NSString *wifiNetworkItemView = nil;
for (id subview in subviews) {
    if([subview isKindOfClass:[NSClassFromString(@"UIStatusBarSignalStrengthItemView") class]]) {
        dataNetworkItemView = subview;
    }
    if([subview isKindOfClass:[NSClassFromString(@"UIStatusBarDataNetworkItemView") class]]) {
        wifiNetworkItemView = subview;
    }
}
int carrierSignalStrength = [[dataNetworkItemView valueForKey:@"signalStrengthRaw"] intValue];
int wifiSignalStrength = [[wifiNetworkItemView valueForKey:@"wifiStrengthRaw"] intValue];

我使用的方法是否私有并不重要

Answer 1

使用coreelephony和CTTelephonyCenter观察者:

#include <CoreTelephony/CoreTelephony.h>
// Event handler
static void SignalStrengthDidChange(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo)
{
    long int raw = 0;
    long int graded = 0;
    long int bars = 0;
    CTIndicatorsGetSignalStrength(&raw, &graded, &bars);
    printf("Signal strength changed! Raw: %li, graded: %li bars: %lin", raw, graded, bars);
    // Prints something like:
    // Signal strength changed! Raw: -96, graded: 27 bars: 3
}

在另一个函数中注册处理程序:

// Register as a listener to the kCTIndicatorsSignalStrengthNotification notification to be notified when the signal strength changed.
CTTelephonyCenterAddObserver(CTTelephonyCenterGetDefault(), NULL, SignalStrengthDidChange, kCTIndicatorsSignalStrengthNotification, NULL, CFNotificationSuspensionBehaviorCoalesce);
// Get the initial strength.
SignalStrengthDidChange();
CFRunLoopRun();

改编自iPhone Dev Wiki上关于CTIndicators的文章。

这些方法不再在任何大于8.4的iOS sdk中(?)我相信。要访问它们，请创建一个新的头文件，并将函数和常量外部化:

#include <CoreFoundation/CoreFoundation.h>
#if __cplusplus
extern "C" {
#endif
#pragma mark - API
    /* This API is a mimic of CFNotificationCenter. */
    CFNotificationCenterRef CTTelephonyCenterGetDefault();
    void CTTelephonyCenterAddObserver(CFNotificationCenterRef center, const void *observer, CFNotificationCallback callBack, CFStringRef name, const void *object, CFNotificationSuspensionBehavior suspensionBehavior);
    void CTTelephonyCenterRemoveObserver(CFNotificationCenterRef center, const void *observer, CFStringRef name, const void *object);
    void CTTelephonyCenterRemoveEveryObserver(CFNotificationCenterRef center, const void *observer);
    void CTIndicatorsGetSignalStrength(long int *raw, long int *graded, long int *bars);
#pragma mark - Definitions
    /* For use with the CoreTelephony notification system. */
    extern CFStringRef kCTIndicatorsSignalStrengthNotification;
#if __cplusplus
}
#endif

Answer 2

我也使用私有api。但是我从(可见的)状态栏得到这个信号强度。

UIApplication *app = [UIApplication sharedApplication];
NSArray *subviews = [[[app valueForKey:@"statusBar"] valueForKey:@"foregroundView"] subviews];
NSString *dataNetworkItemView = nil;
NSString *signalStrengthView = nil;
for (id subview in subviews) {
    NSLog(@"Class - %@", NSStringFromClass([subview class]));
    if([subview isKindOfClass:[NSClassFromString(@"UIStatusBarSignalStrengthItemView") class]]) {
        signalStrengthView = subview;
    }
    if([subview isKindOfClass:[NSClassFromString(@"UIStatusBarDataNetworkItemView") class]]) {
        dataNetworkItemView = subview;
    }
}
int signalStrength = [[signalStrengthView valueForKey:@"signalStrengthRaw"] intValue];
NSLog(@"signal %d", signalStrength);
int wifiStrength = [[dataNetworkItemView valueForKey:@"wifiStrengthRaw"] intValue];
NSLog(@"wifi %d", wifiStrength);

希望这有帮助!!