CBCentralManager : not不返回任何结果
CBCentralManager : not不返回任何结果
提问于 2014-09-08 02:32:43
我试着展示所有可用的BLE信标。我带了一些Estimote和Kontakt.io信标，出于某种原因，下面的BLE扫描代码没有找到它们中的任何一个。
我研究了所有可能的问题，与BLE发现有关的问题，而且代码和其他地方完全一样。
- (void)viewDidLoad {
[super viewDidLoad];
self.manager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
}
/*
Request CBCentralManager to scan for all available services
*/
- (void) startScan
{
NSLog(@"Start scanning");
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES], CBCentralManagerScanOptionAllowDuplicatesKey, nil];
[self.manager scanForPeripheralsWithServices:nil options:options];
}此委托方法从不被调用。
/*
Invoked when the central discovers bt peripheral while scanning.
*/
- (void) centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)aPeripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
NSLog(@"THIS NEVER GETS CALLED");
}回答 3
Stack Overflow用户
回答已采纳
发布于 2014-09-08 02:45:08
信标不是作为外设访问的--它们是信标。它们是通过岩心位置框架处理的，而不是核心蓝牙框架。
可以通过Core蓝牙检测到信标所宣传的特定于供应商的服务。
您的代码不会等到CBCentralManager处于开机状态。我做了以下修改，它在iOS 7.1和iOS8上都有效-
- (void)viewDidLoad {
[super viewDidLoad];
self.manager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
}
- (void) startScan
{
NSLog(@"Start scanning");
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES], CBCentralManagerScanOptionAllowDuplicatesKey, nil];
[self.manager scanForPeripheralsWithServices:nil options:options];
}
- (BOOL) isLECapableHardware
{
NSString * state = nil;
switch ([self.manager state])
{
case CBCentralManagerStateUnsupported:
state = @"The platform/hardware doesn't support Bluetooth Low Energy.";
break;
case CBCentralManagerStateUnauthorized:
state = @"The app is not authorized to use Bluetooth Low Energy.";
break;
case CBCentralManagerStatePoweredOff:
state = @"Bluetooth is currently powered off.";
break;
case CBCentralManagerStatePoweredOn:
[self startScan];
return TRUE;
case CBCentralManagerStateUnknown:
default:
return FALSE;
}
NSLog(@"Central manager state: %@", state);
UIAlertView *alert = [[UIAlertView alloc] init];
[alert setMessage:state];
[alert addButtonWithTitle:@"OK"];
[alert show];
return FALSE;
}Stack Overflow用户
发布于 2014-09-08 03:37:22
这个问题是由我正在测试的操作系统版本造成的。让我们简单地说，我正在测试的这个版本是4+4 (因为它在NDA下)
显然，如果触发，新版本将中止扫描。
[self.manager scanForPeripheralsWithServices:nil options:options];在此之前
CBCentralManagerStatePoweredOn is ON所以简单地开始扫描在那个状态使它对我有效。
#pragma mark - CBCentralManager delegate methods
/*
Invoked whenever the central manager's state is updated.
*/
- (void) centralManagerDidUpdateState:(CBCentralManager *)central
{
[self isLECapableHardware]? NSLog(@"YES"):NSLog(@"NO");
}
- (BOOL) isLECapableHardware
{
NSString * state = nil;
switch ([self.manager state])
{
case CBCentralManagerStateUnsupported:
state = @"The platform/hardware doesn't support Bluetooth Low Energy.";
break;
case CBCentralManagerStateUnauthorized:
state = @"The app is not authorized to use Bluetooth Low Energy.";
break;
case CBCentralManagerStatePoweredOff:
state = @"Bluetooth is currently powered off.";
break;
case CBCentralManagerStatePoweredOn://->这里
[self startScan];
return TRUE;
case CBCentralManagerStateUnknown:
default:
return FALSE;
}
return FALSE;
}Stack Overflow用户
发布于 2014-09-08 03:06:53
我下载了您的代码，发现没有调用startScan。有一次我补充说这对我有用。我在日志记录中添加了一些细节如下：
- (void) centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)aPeripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI {
NSLog(@"Discovered %@ %@", aPeripheral, advertisementData);
}我得到了这个输出：
2014-09-08 15:17:11.827 BTTest[4266:60b] New state 5
2014-09-08 15:17:11.830 BTTest[4266:60b] YES
2014-09-08 15:17:11.831 BTTest[4266:60b] Start scanning
2014-09-08 15:17:11.842 BTTest[4266:60b] CoreBluetooth[WARNING] <CBCentralManager: 0x17d6e5d0> is disabling duplicate filtering, but is using the default queue (main thread) for delegate events
2014-09-08 15:17:12.438 BTTest[4266:60b] per <CBPeripheral: 0x17d91220 identifier = C6E33BA0-F6E7-5830-0643-A47855AD27B9, Name = "(null)", state = disconnected> {
kCBAdvDataChannel = 37;
kCBAdvDataIsConnectable = 1;
}
2014-09-08 15:17:12.595 BTTest[4266:60b] per <CBPeripheral: 0x17d89b60 identifier = 4FF1E398-E24C-8739-A19B-9DF8A2A5493B, Name = "Flex", state = disconnected> {
kCBAdvDataChannel = 38;
kCBAdvDataIsConnectable = 1;
kCBAdvDataLocalName = Flex;
kCBAdvDataServiceData = {
"Device Information" = <0704>;
};
kCBAdvDataServiceUUIDs = (
"ADABFB00-6E7D-4601-BDA2-BFFAA68956BA"
);
kCBAdvDataTxPowerLevel = "-6";
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/25716721
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