Load a view from a nib file

UIView+NibLoadedView.m

+ (id)nibLoadedView {
    BOOL isTableViewCell = [self isSubclassOfClass:[UITableViewCell class]];
    UIView *view = isTableViewCell ? [[self alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:NSStringFromClass(self)] : [[self alloc] initWithFrame:CGRectZero];
    UINib *nib = [UINib nibWithNibName:[self nibName] bundle:nil];
    UIView *rootView = [[nib instantiateWithOwner:view options:nil] lastObject];

    if (![rootView isKindOfClass:self]) {
        view.frame = rootView.frame;
        view.backgroundColor = rootView.backgroundColor;

        if (isTableViewCell) {
            UIView *rootContentView = [(UITableViewCell *)rootView contentView];
            UIView *contentView = [(UITableViewCell *)view contentView];

            for (UIView *subview in rootContentView.subviews.copy) {
                [contentView addSubview:subview];
            }
        } else {
            for (UIView *subview in rootView.subviews.copy) {
                [view addSubview:subview];
            }
        }

        rootView = view;
    }

    [rootView viewDidLoad];

    return rootView;
}

UIViewNibLoadedView.m

+ (id)nibLoadedView {
    BOOL isTableViewCell = [self isSubclassOfClass:[UITableViewCell class]];
    UIView *view = isTableViewCell ? [[self alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:NSStringFromClass(self)] : [[self alloc] initWithFrame:CGRectZero];
    UINib *nib = [UINib nibWithNibName:[self nibName] bundle:nil];
    UIView *rootView = [[nib instantiateWithOwner:view options:nil] lastObject];

    if (![rootView isKindOfClass:self]) {
        view.frame = rootView.frame;
        view.backgroundColor = rootView.backgroundColor;

        if (isTableViewCell) {
            UIView *rootContentView = [(UITableViewCell *)rootView contentView];
            UIView *contentView = [(UITableViewCell *)view contentView];

            for (UIView *subview in rootContentView.subviews.copy) {
                [contentView addSubview:subview];
            }
        } else {
            for (UIView *subview in rootView.subviews.copy) {
                [view addSubview:subview];
            }
        }

        rootView = view;
    }

    [rootView viewDidLoad];

    return rootView;
}

+ (NSString *)nibName {
    return NSStringFromClass(self);
}

- (void)viewDidLoad {
}