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POiOS: setContentSize is causing my entire UIScrollView frame to jump
 

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  1. POiOS: setContentSize is causing my entire UIScrollView frame to jump
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    <p>There is probably a simple solution to this problem that I'm missing, but I can't seem to find the cause.</p> <p><strong>Problem:</strong> Every time I call setContentSize on my scroll view, it causes the entire scrollview frame to shift. </p> <p><strong>Question:</strong> Why does its position reset every time setContentSize is called? and how do I get it to stop?</p> <p><em>Notes:</em> </p> <ul> <li>The contentOffSet within the Scrollview is fine. It's the entire scrollview frame that jumps to its original position.</li> <li>The scroll view is meant to move up and down with a button press, revealing the UIView underneath. -- This works fine, but when a cell is opened, and CollapseClick calls setContentSize on itself (the scrollview), the entire scrollview jumps back up prematurely</li> <li>Any advice would be appreciated. Thanks.</li> </ul> <h2>Layout:</h2> <ul> <li>Simple Layout: 1 scrollview(full screen), 1 container for UIView(height: 120 point) that appears and disappears as the Scrollview moves up and down. </li> </ul> <p><img src="https://i.stack.imgur.com/RF1dQ.png" alt="enter image description here"></p> <p>MasterView.m (portion)</p> <pre><code>-(void)showPostShout{ CGRect newCCFrame = myCollapseClick.frame;//&lt;----myCollapseClick is the UIScrollView if (!postShoutOpen) { newCCFrame.origin.y += 120; [UIView animateWithDuration:.4 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{ self.postShoutContainer.alpha = 1; myCollapseClick.frame= newCCFrame; } completion: ^(BOOL finished){ NSLog(@"finished!"); }]; } else{ newCCFrame.origin.y -= 120; [UIView animateWithDuration:.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{ self.postShoutContainer.alpha = 0; myCollapseClick.frame= newCCFrame; } completion: ^(BOOL finished){ NSLog(@"finished2!"); }]; } postShoutOpen = !postShoutOpen; } </code></pre> <p>CollapseableClick.m (offending portion?)</p> <pre><code>-(void)repositionCollapseClickCellsBelowIndex:(int)index withOffset:(float)offset { for (int yy = index+1; yy &lt; self.dataArray.count; yy++) { CollapseClickCell *cell = [self.dataArray objectAtIndex:yy]; cell.frame = CGRectMake(cell.frame.origin.x, cell.frame.origin.y + offset, cell.frame.size.width, cell.frame.size.height); } // Resize self.ContentSize CollapseClickCell *lastCell = [self.dataArray objectAtIndex:self.dataArray.count - 1]; [self setContentSize:CGSizeMake(self.frame.size.width, lastCell.frame.origin.y + lastCell.frame.size.height + kCCPad)]; } </code></pre> <p>collapseableclick.m (whole)</p> <pre><code>// // CollapseClick.m // CollapseClick // // Created by Ben Gordon on 2/28/13. // Copyright (c) 2013 Ben Gordon. All rights reserved. // #import "CollapseClick.h" //#import "UIScrollView+SVPullToRefresh.h" @implementation CollapseClick @synthesize CollapseClickDelegate; - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { // Initialization code self.isClickedArray = [[NSMutableArray alloc] initWithCapacity:[CollapseClickDelegate numberOfCellsForCollapseClick]]; self.dataArray = [[NSMutableArray alloc] initWithCapacity:[CollapseClickDelegate numberOfCellsForCollapseClick]]; [self reloadCollapseClick]; } return self; } #pragma mark - Load Data -(void)reloadCollapseClick { // Set Up: Height float totalHeight = 0; // If Arrays aren't Init'd, Init them if (!(self.isClickedArray)) { self.isClickedArray = [[NSMutableArray alloc] initWithCapacity:[CollapseClickDelegate numberOfCellsForCollapseClick]]; } if (!(self.dataArray)) { self.dataArray = [[NSMutableArray alloc] initWithCapacity:[CollapseClickDelegate numberOfCellsForCollapseClick]]; } // Make sure they are clear [self.isClickedArray removeAllObjects]; [self.dataArray removeAllObjects]; // Remove all subviews for (UIView *subview in self.subviews) { [subview removeFromSuperview]; } // Add cells for (int xx = 0; xx &lt; [CollapseClickDelegate numberOfCellsForCollapseClick]; xx++) { // Create Cell ///add delegate methods for agree/disagree debaters here CollapseClickCell *cell = [CollapseClickCell newCollapseClickCellWithTitle:[CollapseClickDelegate titleForCollapseClickAtIndex:xx] stats:[CollapseClickDelegate statsForCollapseClick:xx] index:xx content:[CollapseClickDelegate viewForCollapseClickContentViewAtIndex:xx]]; // Set cell.TitleView's backgroundColor if ([(id)CollapseClickDelegate respondsToSelector:@selector(colorForCollapseClickTitleViewAtIndex:)]) { cell.TitleView.backgroundColor = [CollapseClickDelegate colorForCollapseClickTitleViewAtIndex:xx]; } else { cell.TitleView.backgroundColor = [UIColor colorWithWhite:0.4 alpha:1.0]; } // Set cell.TitleLabel's Color if ([(id)CollapseClickDelegate respondsToSelector:@selector(colorForTitleLabelAtIndex:)]) { cell.TitleLabel.textColor = [CollapseClickDelegate colorForTitleLabelAtIndex:xx]; } else { cell.TitleLabel.textColor = [UIColor whiteColor]; } // Set cell.TitleArrow's Color if ([(id)CollapseClickDelegate respondsToSelector:@selector(colorForTitleArrowAtIndex:)]) { [cell.TitleArrow drawWithColor:[CollapseClickDelegate colorForTitleArrowAtIndex:xx]]; } else { [cell.TitleArrow drawWithColor:[UIColor colorWithWhite:0.0 alpha:0.35]]; } // Set cell.ContentView's size cell.ContentView.frame = CGRectMake(0, kCCHeaderHeight + kCCPad, self.frame.size.width, cell.ContentView.frame.size.height); // Set cell's size cell.frame = CGRectMake(0, totalHeight, self.frame.size.width, kCCHeaderHeight); // Add target to Button [cell.TitleButton addTarget:self action:@selector(didSelectCollapseClickButton:) forControlEvents:UIControlEventTouchUpInside]; // Add cell [self addSubview:cell]; // Add to DataArray &amp; isClickedArray [self.isClickedArray addObject:[NSNumber numberWithBool:NO]]; [self.dataArray addObject:cell]; // Calculate totalHeight totalHeight += kCCHeaderHeight + kCCPad; } // Set self's ContentSize and ContentOffset [self setContentSize:CGSizeMake(self.frame.size.width, totalHeight)]; [self setContentOffset:CGPointZero]; [[NSNotificationCenter defaultCenter] postNotificationName:@"CollapseClickUpdated" object: self ]; } #pragma mark - Reposition Cells -(void)repositionCollapseClickCellsBelowIndex:(int)index withOffset:(float)offset { for (int yy = index+1; yy &lt; self.dataArray.count; yy++) { CollapseClickCell *cell = [self.dataArray objectAtIndex:yy]; cell.frame = CGRectMake(cell.frame.origin.x, cell.frame.origin.y + offset, cell.frame.size.width, cell.frame.size.height); } // Resize self.ContentSize CollapseClickCell *lastCell = [self.dataArray objectAtIndex:self.dataArray.count - 1]; [self setContentSize:CGSizeMake(self.frame.size.width, lastCell.frame.origin.y + lastCell.frame.size.height + kCCPad)]; } #pragma mark - Did Click -(void)didSelectCollapseClickButton:(UIButton *)titleButton { BOOL isOpen = NO; // Cell is OPEN -&gt; CLOSED if ([[self.isClickedArray objectAtIndex:titleButton.tag] boolValue] == YES) { [self closeCollapseClickCellAtIndex:titleButton.tag animated:YES]; } // Cell is CLOSED -&gt; OPEN else { [self openCollapseClickCellAtIndex:titleButton.tag animated:YES]; isOpen = YES; } // Call delegate method if ([(id)CollapseClickDelegate respondsToSelector:@selector(didClickCollapseClickCellAtIndex:isNowOpen:)]) { [CollapseClickDelegate didClickCollapseClickCellAtIndex:titleButton.tag isNowOpen:isOpen]; } } #pragma mark - Open CollapseClickCell -(void)openCollapseClickCellAtIndex:(int)index animated:(BOOL)animated { // Check if it's not open first if ([[self.isClickedArray objectAtIndex:index] boolValue] != YES) { float duration = 0; if (animated) { duration = 0.25; } [UIView animateWithDuration:duration animations:^{ // Resize Cell CollapseClickCell *cell = [self.dataArray objectAtIndex:index]; cell.frame = CGRectMake(cell.frame.origin.x, cell.frame.origin.y, cell.frame.size.width, cell.ContentView.frame.origin.y + cell.ContentView.frame.size.height + kCCPad); // Change Arrow orientation CGAffineTransform transform = CGAffineTransformMakeRotation(M_PI/2); cell.TitleArrow.transform = transform; // Change isClickedArray [self.isClickedArray replaceObjectAtIndex:index withObject:[NSNumber numberWithBool:YES]]; // Reposition all CollapseClickCells below Cell [self repositionCollapseClickCellsBelowIndex:index withOffset:cell.ContentView.frame.size.height + kCCPad]; }]; } } -(void)openCollapseClickCellsWithIndexes:(NSArray *)indexArray animated:(BOOL)animated { // This works off of NSNumbers for each Index for (int ii = 0; ii &lt; indexArray.count; ii++) { id indexID = indexArray[ii]; if ([indexID isKindOfClass:[NSNumber class]]) { [self openCollapseClickCellAtIndex:[indexID intValue] animated:animated]; } } } #pragma mark - Close CollapseClickCell -(void)closeCollapseClickCellAtIndex:(int)index animated:(BOOL)animated { // Check if it's open first if ([[self.isClickedArray objectAtIndex:index] boolValue] == YES) { float duration = 0; if (animated) { duration = 0.25; } [UIView animateWithDuration:duration animations:^{ // Resize Cell CollapseClickCell *cell = [self.dataArray objectAtIndex:index]; cell.frame = CGRectMake(cell.frame.origin.x, cell.frame.origin.y, cell.frame.size.width, kCCHeaderHeight); // Change Arrow orientation CGAffineTransform transform = CGAffineTransformMakeRotation(0); cell.TitleArrow.transform = transform; // Change isClickedArray [self.isClickedArray replaceObjectAtIndex:index withObject:[NSNumber numberWithBool:NO]]; // Reposition all CollapseClickCells below Cell [self repositionCollapseClickCellsBelowIndex:index withOffset:-1*(cell.ContentView.frame.size.height + kCCPad)]; }]; } } -(void)closeCollapseClickCellsWithIndexes:(NSArray *)indexArray animated:(BOOL)animated { // This works off of NSNumbers for each Index for (int ii = 0; ii &lt; indexArray.count; ii++) { id indexID = indexArray[ii]; if ([indexID isKindOfClass:[NSNumber class]]) { [self closeCollapseClickCellAtIndex:[indexID intValue] animated:animated]; } } } #pragma mark - CollapseClickCell for Index -(CollapseClickCell *)collapseClickCellForIndex:(int)index { if ([[self.dataArray objectAtIndex:index] isKindOfClass:[CollapseClickCell class]]) { return [self.dataArray objectAtIndex:index]; } return nil; } #pragma mark - Scroll To Cell -(void)scrollToCollapseClickCellAtIndex:(int)index animated:(BOOL)animated { CollapseClickCell *cell = [self.dataArray objectAtIndex:index]; [self setContentOffset:CGPointMake(cell.frame.origin.x, cell.frame.origin.y) animated:animated]; } #pragma mark - Content View for Cell -(UIView *)contentViewForCellAtIndex:(int)index { CollapseClickCell *cell = [self.subviews objectAtIndex:index]; return cell.ContentView; } @end </code></pre>
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