藍牙LE詢問權限？

Question

我有一個應用程序使用BLE。在某些情況下，例如安裝在iPhone6上時，該應用程序正在運行，並未要求使用BLE的權限。

在其他情況下，例如我的iPad Air，應用程序開始運行，它不要求用戶許可BLE，並且BLE不工作（雖然設備上的藍牙已打開）。

我不明白，當自動許可請求發生？ 如何啓用特定的應用程序在iDevice設置中使用BLE？ 我該如何申請應用程序內的權限？

Answer 1

使用下面的代碼並調用函數[self detectBluetooth];要檢查藍牙連接

#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

它不是一個權限問題，但你可能會遇到在您的藍牙是不是還沒有通電的情況。

我需要看看你在哪裏放置你的scanForPeripheralsWithServices調用，因爲它調用得太早總會導致失敗的調用。

相反，這裏把它確保藍牙已準備好開始掃描：

- (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); 
    } 
}