应用已经消失,iOS iBeacon /蓝牙连接
2019年12月27日
作者：佚名
我需要的：
一种可预测,可靠且可靠的启动iBeacon委托方法的方法,例如didDetermineState,didRangeBeacons,didEnterRegion或didExitRegion,当应用程序死机且设备已插入并附近时.
目前的情况
我正在为父母制作一个应用程序,让他们的孩子帮助他们在重要时间关闭手机.该应用程序位于Objective-C中,即使在应用程序生命周期之后,它仍需要与蓝牙设备保持持久连接.
我已经尝试了很长时间才能使这个工作,我得到了很多S.O.的帮助.海报,目前我知道我必须在我的设备中使用iBeacon从终止启动(这是我使用它的唯一原因,如果有其他方式从终止启动应用程序,我很乐意转储它).为了澄清,我在同一个设备(我已经建立)iBeacon和一个可靠的BT连接这里需要2件事.我需要此设备连接配对,因为这是从BT设备发送/接收命令的唯一方法.我发现的是,在后台触发的didRange或didEnter委托方法充其量是不可靠的.他们并不总是立即开火,他们只开了几次而整个事情都死了(我现在知道这个10秒窗口是终止应用程序的预期行为).我甚至整天都在插拔电源,不断寻找应用程序恢复生机的任何迹象……
当应用程序打开时,工作正常,但是当应用程序在我的灯塔/蓝牙附近时,我希望它在应用程序内部启动一种临时锁定屏幕.当应用程序处于前台时,我已经相当好地完成了这一部分.如果一个孩子试图关闭应用程序或后台,我想通过让我的BT设备一旦终止就启动到后台进行响应(我知道用户界面不会出现,而且没关系,我只需要一系列功能即可开启) .然后它将连接到蓝牙并从设备接收一些命令.听起来很简单呃？事情变得混乱了.
一些上下文：我在info.plist中为蓝牙和信标添加了所有后台模式,当应用程序处于前台时,一切正常……
如果在范围内检测到iBeacon,那么我想使用该10秒窗口通过BT配对连接到我的盒子并通过命令发送.到目前为止,这是不可思议的…当应用程序终止时,iBeacon测距函数不会触发它们只会触发最奇怪的用例.我似乎无法预测它们什么时候开火.
我的代码
ibeaconManager.h
@interface IbeaconManager : NSObject @property (nonatomic) BOOL waitingForDeviceCommand; @property (nonatomic,strong) NSTimer *deviceCommandTimer; + (IbeaconManager *) sharedInstance; - (void)startMonitoring; - (void)stopMonitoring; - (void)timedLock:(NSTimer *)timer; @end
ibeaconManager.m
@interface IbeaconManager () <CLLocationManagerDelegate>
@property (nonatomic,strong) BluetoothMgr *btManager;
@property (nonatomic,strong) CLLocationManager *locationManager;
@property (nonatomic,strong) CLBeaconRegion *region;
@property (nonatomic) BOOL connectedToDevice;
@end
NSString *const PROXMITY_UUID = @"00000000-1111-2222-3333-AAAAAAAAAAAA";
NSString *const BEACON_REGION = @"MY_CUSTOM_REGION";
const int REGION_MINOR = 0;
const int REGION_MAJOR = 0;
@implementation IbeaconManager
+ (IbeaconManager *) sharedInstance {
static IbeaconManager *_sharedInstance = nil;
static dispatch_once_t oncePredicate;
dispatch_once(&oncePredicate,^{
_sharedInstance = [[IbeaconManager alloc] init];
});
return _sharedInstance;
}
- (id)init {
self = [super init];
if(self) {
self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self;
[self.locationManager requestAlwaysAuthorization];
self.connectedToDevice = NO;
self.waitingForDeviceCommand = NO;
self.region = [[CLBeaconRegion alloc] initWithProximityUUID:[[NSUUID alloc] initWithUUIDString:PROXMITY_UUID]
major:REGION_MAJOR
minor:REGION_MINOR
identifier:BEACON_REGION];
self.region.notifyEntryStateOnDisplay = YES;
self.region.notifyOnEntry = YES;
self.region.notifyOnExit = YES;
}
return self;
}
- (void)startMonitoring {
if(self.region != nil) {
NSLog(@"**** started monitoring with beacon region **** : %@",self.region);
[self.locationManager startMonitoringForRegion:self.region];
[self.locationManager startRangingBeaconsInRegion:self.region];
}
}
- (void)stopMonitoring {
NSLog(@"*** stopMonitoring");
if(self.region != nil) {
[self.locationManager stopMonitoringForRegion:self.region];
[self.locationManager stopRangingBeaconsInRegion:self.region];
}
}
- (void)triggerCustomLocalNotification:(NSString *)alertBody {
UILocalNotification *localNotification = [[UILocalNotification alloc] init];
localNotification.alertBody = alertBody;
[[UIApplication sharedApplication] presentLocalNotificationNow:localNotification];
}
#pragma mark - CLLocationManager delegate methods
- (void)locationManager:(CLLocationManager *)manager
didDetermineState:(CLRegionState)state
forRegion:(CLRegion *)region {
NSLog(@"did determine state STATE: %ld",(long)state);
NSLog(@"did determine state region: %@",region);
[self triggerCustomLocalNotification:@"made it into the did determine state method"];
NSUInteger appState = [[UIApplication sharedApplication] applicationState];
NSLog(@"application's current state: %ld",(long)appState);
if(appState == UIApplicationStateBackground || appState == UIApplicationStateInactive) {
NSString *notificationText = @"Did range beacons... The app is";
NSString *notificationStateText = (appState == UIApplicationStateInactive) ? @"inactive" : @"backgrounded";
NSString *notificationString = [NSString stringWithFormat:@"%@ %@",notificationText,notificationStateText];
NSUserDefaults *userDefaults = [[NSUserDefaults alloc] init];
bool isAppLockScreenShowing = [userDefaults boolForKey:@"isAppLockScreenShowing"];
if(!isAppLockScreenShowing && !self.waitingForDeviceCommand) {
self.waitingForDeviceCommand = YES;
self.deviceCommandTimer = [NSTimer scheduledTimerWithTimeInterval:2.0
target:self
selector:@selector(timedLock:)
userInfo:notificationString
repeats:NO];
}
} else if(appState == UIApplicationStateActive) {
if(region != nil) {
if(state == CLRegionStateInside) {
NSLog(@"locationManager didDetermineState INSIDE for %@",region.identifier);
[self triggerCustomLocalNotification:@"locationManager didDetermineState INSIDE"];
} else if(state == CLRegionStateOutside) {
NSLog(@"locationManager didDetermineState OUTSIDE for %@",region.identifier);
[self triggerCustomLocalNotification:@"locationManager didDetermineState OUTSIDE"];
} else {
NSLog(@"locationManager didDetermineState OTHER for %@",region.identifier);
}
}
//Upon re-entry,remove timer
if(self.deviceCommandTimer != nil) {
[self.deviceCommandTimer invalidate];
self.deviceCommandTimer = nil;
}
}
}
- (void)locationManager:(CLLocationManager *)manager
didRangeBeacons:(NSArray *)beacons
inRegion:(CLBeaconRegion *)region {
NSLog(@"Did range some beacons");
NSUInteger state = [[UIApplication sharedApplication] applicationState];
NSString *notificationStateText = (state == UIApplicationStateInactive) ? @"inactive" : @"backgrounded";
NSLog(@"application's current state: %ld",(long)state);
[self triggerCustomLocalNotification:[NSString stringWithFormat:@"ranged beacons,application's current state: %@",notificationStateText]];
if(state == UIApplicationStateBackground || state == UIApplicationStateInactive) {
NSString *notificationText = @"Did range beacons... The app is";
NSString *notificationString = [NSString stringWithFormat:@"%@ %@",notificationStateText];
NSUserDefaults *userDefaults = [[NSUserDefaults alloc] init];
bool isAppLockScreenShowing = [userDefaults boolForKey:@"isAppLockScreenShowing"];
if(!isAppLockScreenShowing && !self.waitingForDeviceCommand) {
self.waitingForDeviceCommand = YES;
self.deviceCommandTimer = [NSTimer scheduledTimerWithTimeInterval:2.0
target:self
selector:@selector(timedLock:)
userInfo:notificationString
repeats:NO];
}
} else if(state == UIApplicationStateActive) {
if(self.deviceCommandTimer != nil) {
[self.deviceCommandTimer invalidate];
self.deviceCommandTimer = nil;
}
}
}
- (void)timedLock:(NSTimer *)timer {
self.btManager = [BluetoothMgr sharedInstance];
[self.btManager sendCodeToBTDevice:@"magiccommand"
characteristic:self.btManager.lockCharacteristic];
[self triggerCustomLocalNotification:[timer userInfo]];
self.waitingForDeviceCommand = NO;
}
- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region {
NSLog(@"Did Enter Region: %@",region);
[self triggerCustomLocalNotification:[NSString stringWithFormat:@"Did enter region: %@",region.identifier]];
}
- (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region {
NSLog(@"Did Exit Region: %@",region);
[self triggerCustomLocalNotification:[NSString stringWithFormat:@"Did exit region: %@",region.identifier]];
//Upon exit,remove timer
if(self.deviceCommandTimer != nil) {
[self.deviceCommandTimer invalidate];
self.deviceCommandTimer = nil;
}
}
- (void)locationManager:(CLLocationManager *)manager monitoringDidFailForRegion:(CLRegion *)region withError:(NSError *)error {
NSLog(@"monitoringDidFailForRegion EPIC FAIL for region %@ withError %@",region.identifier,error.localizedDescription);
}
@end
解决方法
我为iOS构建了一个类似的系统,它使用iBeacon传输在后台唤醒,然后连接到蓝牙LE以交换数据.请放心,这一切都是可能的,让工作变得棘手并且调试起来比较棘手.
关于蓝牙LE连接的一些提示：
>当应用程序被杀死时,信标测距功能不会触发,除非您还监视信标并获得didEnter或didExit转换,这将按照您的描述将应用程序重新启动到后台10秒.同样,只有当您从区域转移到区域外或反之亦然时,才会发生这种情况.这很难测试,因为您可能没有意识到CoreLocation在您杀死应用程序时认为您处于“区域内”,但您不会获得用于检测信标的唤醒事件.
>为了在后台获取蓝牙事件,您需要确保您的Info.plist声明：
<key>UIBackgroundModes</key> <array> <string>bluetooth-central</string> </array>
如果不存在,你绝对不会在后台获得对didDiscoverPeripheral的回调.>当您的应用程序启动时,您需要开始扫描蓝牙,并在收到func centralManager的回调时进行连接(_ central：CBCentralManager,didDiscover peripheral：CBPeripheral,advertisementData：[String：Any],rssi RSSI：NSNumber)>从上面保存外围设备实例的副本,因为您只能在后台获得一个回调,以便从每个独特的蓝牙设备中进行发现.如果连接失败,则可以使用相同的外围对象实例重试.>为了调试从kill状态重新启动,我添加了许多NSLog语句(我添加了在代码中打开和关闭它们的能力),然后在XCode的Windows中查找这些 – >设备 – >我的iPhone面板,您可以在其中展开屏幕底部的小箭头,以显示设备上所有应用的日志.如果从被杀死状态重新启动,您绝对会在此处看到针对您的应用的日志.
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