UIScrollView paging with 2 views - objective-c

Question

I tried to implement paging with 2 views from this tutorial:
Multiple virtual pages in a UIScrollView with just 2 child views
I wanted to modify this by putting UIScrollView to pages and in every page updating it with new content:
-(void)addContent:(NSString*)txt{
int size = 5;
UITextView *txtView;
int row = 0;
//from left
int xPlace = 0;
//space between row's
int rowSpace = 20;
//from top
int yPlace = 10;
// int button_with = scrollView.frame.size.width;
int button_height = 20;
for (int i = 0; i < size; i++) {
txtView = [[UITextView alloc] initWithFrame:CGRectMake(xPlace, row*rowSpace+yPlace, scrollView.frame.size.width, 2*button_height)];
[txtView setFont:[UIFont fontWithName:#"ArialMT" size:14]];
txtView.backgroundColor = [UIColor blueColor];
[txtView setText:[NSString stringWithFormat:#"Numer %# - %i",txt,i]];
// answerCheck.titleLabel.font = [UIFont boldSystemFontOfSize:fontSize];
[scrollView addSubview:txtView];
[txtView release];
row++;
}
[scrollView setContentSize:CGSizeMake(scrollView.frame.size.width, txtView.frame.size.height*size)];
}
The idea is when scrolling just replace uiviewcontroller with new content. It calls:
- (void)setPageIndex:(NSInteger)newPageIndex
{
pageIndex = newPageIndex;
if (pageIndex >= 0 && pageIndex < [[DataSource sharedDataSource] numDataPages])
{
NSDictionary *pageData =
[[DataSource sharedDataSource] dataForPage:pageIndex];
label.text = #"Tekstas";//[pageData objectForKey:#"pageName"];
textView.text = [pageData objectForKey:#"pageText"];
[self addContent:[pageData objectForKey:#"pageText"]];
CGRect absoluteRect = [self.view.window
convertRect:textView.bounds
fromView:textView];
if (!self.view.window ||
!CGRectIntersectsRect(
CGRectInset(absoluteRect, TEXT_VIEW_PADDING, TEXT_VIEW_PADDING),
[self.view.window bounds]))
{
textViewNeedsUpdate = YES;
}
}
}
Well here I stuck. My text view is updating but new content of UIscrollView don't update in iPad simulator.
Yea I mean in iphone it works while in iPad it don't. What I could improve if I want to achieve this functionality?
Maybe there are other way to do paging from iOS 5?
I would put source that a tried to make working.
Download source

Answer 1

You can just use a nib file add a UIScrollView with fix width and height. Now make some pages as a UIView and add them to UIScrollView with same size and same origin. In the main UIView:
- (void)viewDidLoad
{
[super viewDidLoad];
scrollView.contentSize = CGSizeMake(scrollView.frame.size.width, scrollView.frame.size.height * 2);
}
-(void)viewWillAppear:(BOOL)animated{
CGFloat h = scrollView.frame.size.height;
[pageView1 setFrame:CGRectMake(0, 0, pageView1.frame.size.width, pageView1.frame.size.height)];
[pageView2 setFrame:CGRectMake(0, h, pageView2.frame.size.width, pageView2.frame.size.height)];
}
And don't forget to check Paging Enabled for UIScrollView in the Attributes in the nib file.
I hope be useful for you!