instancetype

// Allocate and initialize other class objects and assign to the instance variable of ViewController
- (instancetype) initWithCoder:(NSCoder *)aDecoder {
    if (self = [super initWithCoder:aDecoder]) {
        streamManager = [[BMHttpAudioStreamManager alloc] init];
        directoryManager = [[BMDirectorySetUp alloc] init];
    }
    return self;
}