For iOS, review contentSize, contentOffset, and contentInset

For iOS, review contentSize, contentOffset, and contentInset
For iOS, review contentSize, contentOffset, and contentInset

ContentSize is the area where scrollview can scroll. For example, frame = (0, 0,320,480) contentSize = (320,960) indicates that your scrollview can scroll up or down, and the rolling area is twice the frame size.

ContentOffset is the offset of the vertex in the current display area of the scrollview to the frame vertex. For example, if you pull to the bottom of the last example, contentoffset is (0,480), that is, y offset is 480.

ContentInset is the position of the contentview vertex of the scrollview relative to the scrollview. For example, if your contentInset = (0,100), your contentview is displayed starting from the scrollview (0,100 ).

In addition, UITableView is a subclass of UIScrollView, which has different attributes. The contentsize of tabelview is implemented by the following methods:
-(NSInteger) numberOfSections;
-(NSInteger) numberOfRowsInSection :( NSInteger) section;
-(CGFloat) tableView :( UITableView) tableView heightForRowAtIndexPath :( NSIndexPath) indexPath;
-(CGFloat) tableView :( UITableView *) tableView heightForHeaderInSection :( NSInteger) section;
-(CGFloat) tableView :( UITableView *) tableView heightForFooterInSection :( NSInteger) section;
It automatically calculates all the heights and serves as the height of its contentsize.

For example, in the delegate method
-(NSInteger) tableView :( UITableView *) tableView numberOfRowsInSection :( NSInteger) section {
Return 100;
}
The contentsize of your tabelview is (320,440 0)