蓝牙LE询问权限？

Question

我有一个应用程序使用BLE。在某些情况下，例如安装在iPhone6上时，该应用程序正在运行，并未要求使用BLE的权限。

在其他情况下，例如我的iPad Air，应用程序开始运行，它不要求用户许可BLE，并且BLE不工作（虽然设备上的蓝牙已打开）。

我不明白，当自动许可请求发生？ 如何启用特定的应用程序在iDevice设置中使用BLE？ 我该如何申请应用程序内的权限？

Answer 1

使用下面的代码并调用函数[self detectBluetooth];要检查蓝牙连接

#import <CoreBluetooth/CoreBluetooth.h> 


#pragma mark - setUp bluetoothManager 

//check bluetooth connection 
- (void)detectBluetooth 
{ 

    if(!self.bluetoothManager) 
    { 
     // Put on main queue so we can call UIAlertView from delegate callbacks. 
     self.bluetoothManager = [[CBCentralManager alloc] initWithDelegate:self queue:dispatch_get_main_queue()] ; 
    } 
    [self centralManagerDidUpdateState:self.bluetoothManager]; // Show initial state 
} 

- (void)centralManagerDidUpdateState:(CBCentralManager *)central 
{ 
    NSString *stateString = nil; 
    switch(bluetoothManager.state) 
    { 
     case CBCentralManagerStateResetting: 
      [self alertStatus:@"The connection with the system service was momentarily lost, update imminent." :@"update imminent" :0]; 
      break; 

     case CBCentralManagerStateUnsupported: 
      [self alertStatus:@"The platform doesn't support Bluetooth Low Energy.":@"weak Bluetooth Connection" :0]; 
      break; 

     case CBCentralManagerStateUnauthorized: 
      [self alertStatus:@"The app is not authorized to use Bluetooth Low Energy.":@"weak Bluetooth Connection" :0]; 
      break; 
     case CBCentralManagerStatePoweredOff: 
      stateString = @"Bluetooth is currently powered off."; 
      [self alertStatus:@"Bluetooth is currently powered off , powered ON first.":@"No Bluetooth Connection" :0]; 
      break; 
     case CBCentralManagerStatePoweredOn: 
      stateString = @"Bluetooth is currently powered on and available to use."; 
      // [self alertStatus:@"Bluetooth is currently powered ON.":@" Bluetooth available" :0]; 

      break; 
     default: 
      stateString = @"State unknown, update imminent."; 
      break; 
    } 


    NSLog(@"Bluetooth State %@",stateString); 


} 






@end 

Answer 2

它不是一个权限问题，但你可能会遇到在您的蓝牙是不是还没有通电的情况。

我需要看看你在哪里放置你的scanForPeripheralsWithServices调用，因为它调用得太早总会导致失败的调用。

相反，这里把它确保蓝牙已准备好开始扫描：

- (void) centralManagerDidUpdateState: (CBCentralManager *) central { 
    if (self.centralManager.state == CBCentralManagerStatePoweredOn) { 
     NSArray *services = @[]; 
     [self.centralManager scanForPeripheralsWithServices:services options:nil]; 
    } else { 
     NSLog(@"Failed to start scan, returned error code: %li",(long)self.centralManager.state); 
    } 
}