The use of the screen scrolling control ScrollView

1.UIScrollView has 2 subclasses, Uitextview and UITableView, and these two controls are often needed, so it is necessary to master its use. They are both horizontal or vertical scrollbars that can be provided when the content is out of the screen.

2. The main 3 properties, Contentsize, Contentinset, and Contentoffset.

2.1 First, be sure to set the Contentsize(the size of the actual content in the control) this property, and this property to be set more than the screen display of the control of the range, to appear scrolling effect.

For example, if the size of the ScrollView is (768,1000), the contents of the (900,1200) range can be displayed in (768,1000) through the scrollbar, as set out below.

-(void) viewdidload{    [Super Viewdidload]; Additional setup after loading the view, typically from a nib.    Self.scrollView.contentSize = Cgsizemake (900, 1200);}

2.2 Contentinset This property is the border blank size, relatively simple.

2.3 Contentoffset This property to note, its role is to set the starting control to display the range.

For example, if you want the initial display to offset the contents of y-direction 200, the following setting will have a dynamic effect of moving down by 200.

-(void) Viewdidappear: (BOOL) animated
{    [Self.scrollview setcontentoffset:cgpointmake (0, $) animated:yes];}

3. Remember to cancel the check option in the storyboard use Auto layout, otherwise scrollview scrolling will fail.

All of these are simple to use and later encounter more specific use to supplement.

The use of the screen scrolling control ScrollView