ios 翻頁例子源碼

demo功能：ios 翻頁例子源碼。iphone 6.1測試通過。

demo說明：AppDelegate.m中又主要的頁面控制碼。MyViewController.m是翻動的頁面。

 

demo主要代碼：AppDelegate.m

 

 (void)loadScrollViewWithPage:(int)page {      if (page < 0) return;      if (page >= kNumberOfPages) return;        // replace the placeholder if necessary       MyViewController *controller = [viewControllers objectAtIndex:page];      if ((NSNull *)controller == [NSNull null]) {          controller = [[MyViewController alloc] initWithPageNumber:page];          [viewControllers replaceObjectAtIndex:page withObject:controller];          [controller release];      }        // add the controller's view to the scroll view       if (nil == controller.view.superview) {          CGRect frame = scrollView.frame;          frame.origin.x = frame.size.width * page;          frame.origin.y = 0;          controller.view.frame = frame;          [scrollView addSubview:controller.view];      }  }    - (void)scrollViewDidScroll:(UIScrollView *)sender {      // We don't want a "feedback loop" between the UIPageControl and the scroll delegate in       // which a scroll event generated from the user hitting the page control triggers updates from       // the delegate method. We use a boolean to disable the delegate logic when the page control is used.       if (pageControlUsed) {          // do nothing - the scroll was initiated from the page control, not the user dragging           return;      }      // Switch the indicator when more than 50% of the previous/next page is visible       CGFloat pageWidth = scrollView.frame.size.width;      int page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;      pageControl.currentPage = page;        // load the visible page and the page on either side of it (to avoid flashes when the user starts scrolling)       [self loadScrollViewWithPage:page - 1];      [self loadScrollViewWithPage:page];      [self loadScrollViewWithPage:page + 1];        // A possible optimization would be to unload the views+controllers which are no longer visible   }