Contents are shuffles in GridView - iphone

Question

I am new to IOS development. I am using custom GridView to load the content in my project, and it is working fine for Simulator when the content reloads. But in iPad the content gets shuffles when reloads.
- (void)reloadData {
if (_gridViewDelegate && self.superview != nil) {
CGFloat maxX = 0.f;
CGFloat maxY = 0.f;
_scrollView.pagingEnabled = YES;
self.gridRects = [self.gridViewDelegate rectsForCellsInGridView:self];
[self.gridCells.allValues makeObjectsPerformSelector:#selector(removeFromSuperview)];
[self.reuseableCells addObjectsFromArray:self.gridCells.allValues];
[self.gridCells removeAllObjects];
for (NSValue *rectValue in self.gridRects) {
CGRect rect = [rectValue CGRectValue];
maxX = MAX(maxX, rect.origin.x + rect.size.width);
maxY = MAX(maxY, rect.origin.y + rect.size.height);
}
CGFloat pageWidth = self.scrollView.frame.size.width;
self.maximumContentWidth=maxX;
maxX = MAX(MIN(maxX, self.maximumContentWidth), self.contentSize.width);
maxY = MAX(MIN(maxX, self.maximumContentHeight), self.contentSize.height);
maxX=pageCount*pageWidth;
self.scrollView.contentSize = CGSizeMake(maxX, maxY);
[self loadCellsInRect:self.visibleRect];
[self updateStickyViewsPosition];
[pageNumberLable removeFromSuperview];
currentPage = floor((self.scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
if(pageWidth == 1024)
{
pageNumberLable=[[UILabel alloc]initWithFrame:CGRectMake(self.scrollView.contentOffset.x+990, 690, 20, 20)];
pageNumberLable.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
}
else
{
pageNumberLable=[[UILabel alloc]initWithFrame:CGRectMake(self.scrollView.contentOffset.x+740, 943, 20, 20)];
pageNumberLable.backgroundColor=[UIColor redColor];
pageNumberLable.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
}
pageNumberLable.text=[NSString stringWithFormat:#"%d",currentPage+1];
pageNumberLable.textColor=[UIColor blackColor];
pageNumberLable.font = [UIFont boldSystemFontOfSize:16];
pageNumberLable.backgroundColor=[UIColor clearColor];
[self.scrollView addSubview:pageNumberLable];
pageIndex = [NSUserDefaults standardUserDefaults];
[pageIndex setInteger:currentPage+1 forKey:#"integerKey"];
}
}
-(void)reloadGrid
{
if(rotate == newIntValue)
{
[spinningLibrary stopAnimating];
[update removeFromSuperview];
settingLabel.hidden=YES;
spinningLibrary.hidden=YES;
}
if(rotate<newIntValue)
{
rotate++;
[self.gridView scrollRectToVisible:CGRectMake(768*rotate, 0, self.gridView.frame.size.width, self.gridView.frame.size.height) animated:YES];
[NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:#selector(reloadGrid123) userInfo:nil repeats:NO];
}
[NSThread sleepForTimeInterval:0.2];
self.gridView.scrollView.hidden=NO;
[settingsPopoverController dismissPopoverAnimated:YES];
}

Answer 1

You're comparing iPad's RAM and your machine's RAM.It's not fair though.
[NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:#selector(reloadGrid123) userInfo:nil repeats:NO];
Try to adjust the interval(> 0.1) by setting, scheduledTimerWithTimeInterval.
And it's a bad way of blocking the main thread.
Use below blocks approach to "do something after sometime".
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// Do something taking a long time in background.
[NSThread sleepForTimeInterval:0.2];
// Background thread has finished it's work.
// Call another block on main thread to do UI stuff like updating etc..
dispatch_async(dispatch_get_main_queue(), ^{
// Here you are in the main thread again
// You can do whatever you want
});
});