Common initialization methods for a custom view in Objective C

commonInit.m

- (void)commonInit {
    // Do stuff.
}

- (instancetype)init {
    if (self = [super init]) {
        [self commonInit];
    }
    
    return self;
}

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        [self commonInit];
    }
    return self;
}

- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super initWithCoder:aDecoder]) {
        [self commonInit];
    }
    
    return self;
}