任何方式在iOS7 +上以编程方式打开蓝牙(Any way to turn on bluetooth programmatically on iOS7+)

 不，如果用户关闭了蓝牙，您只能显示一条提示或消息，要求他们打开它。 
 
- (void)centralManagerDidUpdateState:(CBCentralManager *)central {

    if (central.state == CBCentralManagerStatePoweredOff) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Error" message: @"Please turn on Bluetooth in Settings" delegate: nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
       [alert show]; 
    }
 }

No, if the user has turned off Bluetooth all you can do is display an alert or message asking them to turn it on.
 
- (void)centralManagerDidUpdateState:(CBCentralManager *)central {

    if (central.state == CBCentralManagerStatePoweredOff) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Error" message: @"Please turn on Bluetooth in Settings" delegate: nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
       [alert show]; 
    }
 }