I've got an magazine app which contains big images. When I want to turn over the page there is a big delay before the page will be turned. So I try to cache previous, current and next page but without effect. I think I'm adding viewControllers but those are only getting images files without drawing. Is there any way how to draw images in background before page's turned? There's some code:
MagazineViewController:
- (void)loadViews {
NSInteger pagesCount = [_pages count];
if (currentPage == 0) currentPage = 1;
if ([[NSThread currentThread] isCancelled]) return;
if (_curPage == nil) {
_curPage = [[PageViewController alloc] init];
PageView *pageView = [[PageView alloc] initWithFrame:self.view.bounds];
[pageView setPages:_pages];
[pageView setPage:currentPage];
[pageView setMagazineID:_magazineID];
[pageView buildFrames];
//[pageView setHidden:YES];
[_curPage setView:pageView];
//[_flipper addSubview:magazineView];
[pageView release];
[[NSNotificationCenter defaultCenter] postNotificationName:kPageLoadedNotification object:nil];
}
if (_prevPage == nil) {
if (currentPage > 1) {
_prevPage = [[PageViewController alloc] init];
PageView *pageView = [[PageView alloc] initWithFrame:self.view.bounds];
[pageView setPages:_pages];
[pageView setPage:currentPage - 1];
[pageView setMagazineID:_magazineID];
[pageView buildFrames];
[_prevPage setView:pageView];
//[_pageViewController.view addSubview:_prevPage.view];
[pageView release];
[[NSNotificationCenter defaultCenter] postNotificationName:kPageLoadedNotification object:nil];
}
}
if (_nextPage == nil) {
if (currentPage + 1 <= pagesCount) {
_nextPage = [[PageViewController alloc] init];
PageView *pageView = [[PageView alloc] initWithFrame:self.view.bounds];
[pageView setPages:_pages];
[pageView setPage:currentPage + 1];
[pageView setMagazineID:_magazineID];
[pageView buildFrames];
[_nextPage setView:pageView];
//[_pageViewController.view addSubview:_nextPage.view];
[pageView release];
[[NSNotificationCenter defaultCenter] postNotificationName:kPageLoadedNotification object:nil];
}
}
Method "buildFrame" just making position and rect of images and doing "[self addSubView:image]". (self = view of page)
Image drawing:
- (void)drawRect:(CGRect)rect {
[super drawRect:rect];
if (_image != nil) [_image drawInRect:rect];
}
I know about one method how to do but I think It's bad method. Just making previous and next view hidden and when I start to turning set view visible. So is there any other way how to load images and speed up turning? Thx for reply.
