UIView accessibilityLabel accessibilityFrame alpha autoresizingMask backgroundColor frame isHidden UIWindow windowLevel isKeyWindow UIScrollView contentOffset contentSize isScrollEnabled contentInset isPagingEnabled bounces alwaysBounceVertical alwaysBounceHorizontal showsHorizontalScrollIndicator showsVerticalScrollIndicator zoomScale maximumZoomScale minimumZoomScale delegate UITableView dataSource UILabel text font textAlignment UISegmentedControl segmentedControlStyle numberOfSegments selectedSegmentIndex MKMapView mapType isZoomEnabled isScrollEnabled userTrackingMode delegate