Unable to discover peripheral Bluetooth Low Energy devices - ios

Question

I recently upgraded my phone to the iOS Beta version 8 and installed my iOS app . Unfortunately my app no longer is able to discover my peripheral BLE device. I checked for any documentation which says if there has been any change but found none. Has there been any known API changes that have been introduced as part of iOS 8 ? I am testing on iPhone 5s
My code was working earlier on IOS version 7.xx
Relevant piece of code :
[self.CM scanForPeripheralsWithServices:nil options:nil];

Answer 1

Where are you launching the scan?
You should call
self.CM = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
in the viewDidLoad or anywhere else you need to to that, and then scan for peripherals only when the centralmanager state is on:
-(void)centralManagerDidUpdateState:(CBCentralManager *)central{ switch (central.state) {
case CBCentralManagerStatePoweredOff:
NSLog(#"CoreBluetooth BLE hardware is powered off");
break;
case CBCentralManagerStatePoweredOn:
{
NSLog(#"CoreBluetooth BLE hardware is powered on and ready");
[self.CM scanForPeripheralsWithServices:nil options:nil];
}
break;
case CBCentralManagerStateResetting:
NSLog(#"CoreBluetooth BLE hardware is resetting");
break;
case CBCentralManagerStateUnauthorized:
NSLog(#"CoreBluetooth BLE state is unauthorized");
break;
case CBCentralManagerStateUnknown:
NSLog(#"CoreBluetooth BLE state is unknown");
break;
case CBCentralManagerStateUnsupported:
NSLog(#"CoreBluetooth BLE hardware is unsupported on this platform");
break;
default:
break; }