[ios] CBCentralManagerStateを文字列に変換

gistfile1.m

@import CoreBluetooth;

+ (NSString *)centralManagerStateToString:(CBCentralManagerState)state {
    NSString *stateStr;
    switch (state) {
        case CBCentralManagerStateResetting:
            stateStr = @"CBCentralManagerStateResetting";
            break;
        case CBCentralManagerStateUnsupported:
            stateStr = @"CBCentralManagerStateUnsupported";
            break;
        case CBCentralManagerStateUnauthorized:
            stateStr = @"CBCentralManagerStateUnauthorized";
            break;
        case CBCentralManagerStatePoweredOff:
            stateStr = @"CBCentralManagerStatePoweredOff";
            break;
        case CBCentralManagerStatePoweredOn:
            stateStr = @"CBCentralManagerStatePoweredOn";
            break;
        case CBCentralManagerStateUnknown:
        default:
            stateStr = @"CBCentralManagerStateUnknown";
            break;
    }
    return stateStr;
}