获得设备信号强度 [英] Get device signal strength
问题描述
我试图获得载波,wifi,3g和4g的dBm信号强度。
I am trying to get the signal strength in dBm for the carrier, wifi, 3g, and 4g.
我目前正在使用此代码来获取运营商和从状态栏的wifi,我想知道是否有另一种方式或更好的方式?另外我怎么能得到3g和4g?
I am currently using this code to get the carrier's and wifi from the status bar and I would like to know if there is another way or a better way? Also how could I get it for 3g and 4g?
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];
如果我使用的任何方法都是私有的,无关紧要。
It doesn't matter if any methods I use are private or not.
推荐答案
使用CoreTelephony和 CTTelephonyCenter
观察员:
Use CoreTelephony and CTTelephonyCenter
observers:
#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: %li\n", raw, graded, bars);
// Prints something like:
// Signal strength changed! Raw: -96, graded: 27 bars: 3
}
在另一个中注册处理程序函数:
Register the handler in another function:
// 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();
改编自关于CTIndicators的iPhone Dev Wiki文章。
这些方法不再适用于任何大于8.4的iOS SDK(?)我相信。要访问它们,请使用extern函数和常量创建一个新标题:
These methods are no longer in any iOS SDKs greater than 8.4 (?) I believe. To access them, create a new header with to extern the functions and constants:
#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
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