Accessor pattern for iOS properties, UILabel example.

iOSAccessorPattern.m

- (UILabel *)lblTitle
{
    // Check if the property isn't instantiated yet
    if (_lblTitle == nil) {
        _lblTitle = [[UILabel alloc] init];
        
        // Disable auto-constraints if you plan to implement your own
        [_lblTitle setTranslatesAutoresizingMaskIntoConstraints:NO];

        /* Set any one time configuration properties for the label here
        like font / size, color, background, etc.
        */
    }

    /* Determine if the view exists in the hierarchy and add if not.
    Substitute self.view with the desired parent view.
    */
    if (![[self.view subviews] containsObject:_lblTitle]) {
        /* If not using AutoLayout, you should probably set a
        frame here.
        */

        [self.view addSubview:_lblTitle];

        /* Add your NSLayoutConstraints here if you plan to use them
        */
    }

    return _lblTitle;
}

// ...

/* Anywhere else you can refer to the property with self.lblTitle
and it will be checked for nil / in the view hierarchy.

If you don't need to configure anything outside of the accessor,
a simple call to [self.lblTitle setNeedsDisplay] will be sufficient
to instantiate and attach the subview.
*/