Show/Hide Top View and Bottom View while UItableView Scrolling - ios

Question

I did my Top View and Bottom View (UIViews) hide while the UITableView is scrolling. Now, I need to check if the user begin drag the UITableview to up again and back the uiviews for the initial position. I have the following code to do the first step: hidden/show while scrolling uitableview
-(void)scrollViewDidScroll:(UIScrollView *)scrollView {
if(!self.isScrollingFast) {
CGRect screenBound = [[UIScreen mainScreen] bounds];
CGSize screenSize = screenBound.size;
CGFloat screenWidth = screenSize.width;
CGFloat screenHeight = screenSize.height;
NSInteger yOffset = scrollView.contentOffset.y;
if (yOffset > 0) {
self.tabBar.frame = CGRectMake(self.tabBar.frame.origin.x, self.originalFrame.origin.y + yOffset, self.tabBar.frame.size.width, self.tabBar.frame.size.height);
self.viewTopo.frame = CGRectMake(self.viewTopo.frame.origin.x, self.originalFrameTopo.origin.y - yOffset, self.viewTopo.frame.size.width, self.viewTopo.frame.size.height);
if(self.originalFrameHidingView.origin.y - yOffset >= 0) {
self.hidingView.frame = CGRectMake(self.hidingView.frame.origin.x, self.originalFrameHidingView.origin.y - yOffset, self.hidingView.frame.size.width, self.hidingView.frame.size.height);
}
else {
self.hidingView.frame = CGRectMake(self.hidingView.frame.origin.x, -10, self.hidingView.frame.size.width, self.hidingView.frame.size.height);
}
[self.tbPertos setFrame:CGRectMake(self.tbPertos.frame.origin.x, self.hidingView.frame.origin.y + self.hidingView.frame.size.height, self.tbPertos.frame.size.width, self.tbPertos.frame.size.height)];
if(self.tbPertos.frame.size.height + self.tbPertos.frame.origin.y + yOffset <= screenHeight)
self.tbPertos.frame = CGRectMake(self.tbPertos.frame.origin.x, self.tbPertos.frame.origin.y, self.tbPertos.frame.size.width, self.tbPertos.frame.size
.height+yOffset);
else {
self.tbPertos.frame = CGRectMake(self.tbPertos.frame.origin.x, self.tbPertos.frame.origin.y, self.tbPertos.frame.size.width, screenHeight - self.tbPertos.frame.origin.y);
}
}
if (yOffset < 1) {
self.tabBar.frame = self.originalFrame;
self.viewTopo.frame = self.originalFrameTopo;
self.hidingView.frame = self.originalFrameHidingView;
self.tbPertos.frame = CGRectMake(self.tbPertos.frame.origin.x, self.hidingView.frame.origin.y + self.hidingView.frame.size.height, self.tbPertos.frame.size.width, screenHeight - self.tbPertos.frame.origin.y);
}
}
}
And there's the code which I'm trying to do the Top and Bottom View reappear when the user begin scroll up. Independently wheres the scroll offset.
-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
CGPoint currentOffset = scrollView.contentOffset;
NSTimeInterval currentTime = [NSDate timeIntervalSinceReferenceDate];
NSTimeInterval timeDiff = currentTime - self.lastOffsetCapture;
CGFloat distance = currentOffset.y - self.lastOffset.y;
//The multiply by 10, / 1000 isn't really necessary.......
if (distance < 0) {
if(!self.isScrollingFast) {
NSLog(#"voltar posicao normal");
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationDelay:1.0];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
self.tabBar.frame = self.originalFrame;
self.viewTopo.frame = self.originalFrameTopo;
self.hidingView.frame = self.originalFrameHidingView;
self.tbPertos.frame = self.originalFrameTbPertos;
self.isScrollingFast = YES;
[UIView commitAnimations];
}
} else {
self.isScrollingFast = NO;
}
self.lastOffset = currentOffset;
self.lastOffsetCapture = currentTime;
}

Answer 1

Here i implemented code for UIView Hide / Show when tableview scrolling. When tableview scrolling down then UIView is hidden and when scrolling up then UIView show. I hope it's working for you...!
Step 1:- Make one property in .h file
#property (nonatomic) CGFloat previousContentOffset;
Step 2:- Write down this code in scrollViewDidScroll Method.
-(void)scrollViewDidScroll:(UIScrollView *)scrollView {
CGFloat currentContentOffset = scrollView.contentOffset.y;
if (currentContentOffset > self.previousContentOffset) {
// scrolling towards the bottom
[self.subButtonView setHidden:YES];
} else if (currentContentOffset < self.previousContentOffset) {
// scrolling towards the top
[self.subButtonView setHidden:NO];
}
self.previousContentOffset = currentContentOffset;
}