の行数を更新する方法
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
}
展開するときは、行数を増やします。
`-(void)rotateButtonToExpanded:(UIButton *)aButton section:(int)aSection {
// Rotate the button with animation.
[UIView beginAnimations:ROTATE_TO_EXPAND context:nil];
[UIView setAnimationDuration:ANIMATION_DURATION];
aButton.transform = CGAffineTransformMakeRotation(M_PI*2.5);
[UIView commitAnimations];
// Save the state (expanded or collapsed) of button with index path as key.
BOOL isExpanded=![[mStateOfNodes objectAtIndex:aSection] isExpanded];
[[mStateOfNodes objectAtIndex:aSection] setIsExpanded:isExpanded];
NSArray*theDataOfChildCells=[[self.mNodes objectAtIndex:aSection] valueForKey:CHILD_NODES];
for (int i=0; i<theDataOfChildCells.count; i++) {
mNumberOfCells++;
[self beginUpdates];
NSIndexPath*theIndexPath=[NSIndexPath indexPathForRow:i inSection:aSection];
[self insertRowsAtIndexPaths:[NSArray arrayWithObject:theIndexPath] withRowAnimation:UITableViewRowAnimationMiddle];
[self endUpdates];
}
}`