Iphone 更新滚动视图';内容
我有一个应用程序,其中包含一个滚动视图和几个表视图。每个tableview都是从另一个viewcontroller加载的。它是从苹果的PageControl示例应用程序构建的。我的目标是让它像苹果的天气应用程序一样工作 我一切正常。所有内容都可以完美加载,并排滚动显示所有正确的表视图及其相关数据。我有一个按钮,当点击它打开另一个视图,允许你编辑每个项目,就像天气应用程序一样,你可以添加一个新的城市,删除它,或移动它 我遇到的问题是,当用户编辑完项目后,如何更新scrollview。想象一下,在PageControl应用程序中,可以删除第5页或将第4页移动到位置#1,等等 我没有粘贴任何代码,因为:1)它与PageControl应用程序中的代码相同;2) 我还不知道从哪里开始。希望这里有人能帮我 谢谢 更新:(美国东部时间2010年3月5日凌晨3:18) 好的,我已经做了一段时间了。我能够在mainView中调用一个方法来更新scrollView。代码看起来有点笨重,但它可以工作!我真的不喜欢这个代码,因为我只使用了一次属性,无法再次设置它,因为我得到一个错误Iphone 更新滚动视图';内容,iphone,scrollview,uipagecontrol,Iphone,Scrollview,Uipagecontrol,我有一个应用程序,其中包含一个滚动视图和几个表视图。每个tableview都是从另一个viewcontroller加载的。它是从苹果的PageControl示例应用程序构建的。我的目标是让它像苹果的天气应用程序一样工作 我一切正常。所有内容都可以完美加载,并排滚动显示所有正确的表视图及其相关数据。我有一个按钮,当点击它打开另一个视图,允许你编辑每个项目,就像天气应用程序一样,你可以添加一个新的城市,删除它,或移动它 我遇到的问题是,当用户编辑完项目后,如何更新scrollview。想象一下,在P
objc[10801]:FREED(id):message release sent to FREED object=0x3f4a490
。在我看来,这个物体好像已经被释放了?如果是这样,我不知道怎么做,因为我只在dealloc
中发布它dealloc
从未被调用(我放了一个NSLog
来检查),所以我不知道发生了什么
代码:初始代码与Apple PageControl示例应用程序中的代码相同:
- (void)viewDidLoad {
[super viewDidLoad];
appDel = (iBarryAppDelegate *)[[UIApplication sharedApplication] delegate];
managedObjectContext = appDel.managedObjectContext;
NSMutableArray *controllers = [[NSMutableArray alloc] init];
for (unsigned i = 0; i < numberOfPages; i++)
{
[controllers addObject:[NSNull null]];
}
self.viewControllers = controllers;
[controllers release];
scrollView.pagingEnabled = YES;
scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * numberOfPages, scrollView.frame.size.height);
scrollView.showsHorizontalScrollIndicator = NO;
scrollView.showsVerticalScrollIndicator = NO;
scrollView.scrollsToTop = NO;
scrollView.delegate = self;
pageControl.numberOfPages = numberOfPages;
pageControl.currentPage = 0;
//I end up commenting out all the method calls to
//[self loadScrollViewWithPage:xxx]; and load all the views at once.
//I know I should be lazy-loading here , but Scrolling is much
//faster if I load them all at once, instead
//of when they are about to be viewed.
for (unsigned i = 0; i < numberOfPages; i++)
{
[self loadScrollViewWithPage:i];
}
}
- (void)loadMainController:(int)page
{
MainViewController *controller = [viewControllers objectAtIndex:page];
if ((NSNull *)controller == [NSNull null])
{
controller = [[MainViewController alloc] initWithPageNumber:page];
[viewControllers replaceObjectAtIndex:page withObject:controller];
[controller release];
}
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)loadScrollViewWithPage:(int)page
{
if (page < 0) return;
if (page >= numberOfPages) return;
[self loadMainController:page];
}
- (void)scrollViewDidScroll:(UIScrollView *)sender
{
if (pageControlUsed)
{
return;
}
CGFloat pageWidth = scrollView.frame.size.width;
int page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
pageControl.currentPage = page;
// [self loadScrollViewWithPage:page - 1];
// [self loadScrollViewWithPage:page];
// [self loadScrollViewWithPage:page + 1];
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
pageControlUsed = NO;
}
- (IBAction)changePage:(id)sender
{
int page = pageControl.currentPage;
// [self loadScrollViewWithPage:page - 1];
// [self loadScrollViewWithPage:page];
// [self loadScrollViewWithPage:page + 1];
CGRect frame = scrollView.frame;
frame.origin.x = frame.size.width * page;
frame.origin.y = 0;
[scrollView scrollRectToVisible:frame animated:YES];
pageControlUsed = YES;
}
-(void)viewDidLoad{
[超级视图下载];
appDel=(iBarryAppDelegate*)[[UIApplication sharedApplication]委托];
managedObjectContext=appDel.managedObjectContext;
NSMutableArray*控制器=[[NSMutableArray alloc]init];
for(无符号i=0;i=页数)返回;
[自动加载主控制器:第页];
}
-(无效)scrollViewDidScroll:(UIScrollView*)发送方
{
如果(已使用页面控制)
{
返回;
}
CGFloat pageWidth=scrollView.frame.size.width;
int page=floor((scrollView.contentOffset.x-pageWidth/2)/pageWidth)+1;
pageControl.currentPage=页面;
//[带页面的自加载滚动视图:第1页];
//[带页面的自加载滚动视图:第页];
//[self-loadScrollViewWithPage:page+1];
}
-(无效)ScrollViewDiEndDecelling:(UIScrollView*)scrollView
{
pageControlUsed=否;
}
-(iAction)更改页:(id)发件人
{
int page=pageControl.currentPage;
//[带页面的自加载滚动视图:第1页];
//[带页面的自加载滚动视图:第页];
//[self-loadScrollViewWithPage:page+1];
CGRect frame=scrollView.frame;
frame.origin.x=frame.size.width*页;
frame.origin.y=0;
[scrollView scrollRectToVisible:帧动画:是];
pageControlUsed=是;
}
然后,我的代码将刷新滚动视图。我要做的是删除所有子视图并再次加载它们。我不会有超过13个子视图,不确定删除它们并重新创建它们是好主意还是坏主意
- (void)reloadDataNow
{
for(UIView *subview in [scrollView subviews]) {
[subview removeFromSuperview];
NSLog(@"removed a suview");
}
[self loadData]; //this method fetches which data will be
//in the scrollView. It reloads the number of pages based
//on the return result and an NSMutableArray where I store
//data to pass to the views that will appear in the scrollView
NSMutableArray *controllers = [[NSMutableArray alloc] init];
for (unsigned i = 0; i < numberOfPages; i++)
{
[controllers addObject:[NSNull null]];
}
scrollView.pagingEnabled = YES;
scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * numberOfPages, scrollView.frame.size.height);
scrollView.showsHorizontalScrollIndicator = NO;
scrollView.showsVerticalScrollIndicator = NO;
scrollView.scrollsToTop = NO;
scrollView.delegate = self;
pageControl.numberOfPages = numberOfPages;
pageControl.currentPage = 0;
for (unsigned i = 0; i < numberOfPages; i++)
{
MainViewController *controller = [controllers objectAtIndex:i];
if ((NSNull *)controller == [NSNull null])
{
controller = [[MainViewController alloc] initWithPageNumber:i team:[[favoritesArray objectAtIndex:i] teamR]];
[controllers replaceObjectAtIndex:i withObject:controller];
[controller release];
}
if (nil == controller.view.superview)
{
CGRect frame = scrollView.frame;
frame.origin.x = frame.size.width * i;
frame.origin.y = 0;
controller.view.frame = frame;
[scrollView addSubview:controller.view];
}
}
//********************CRASH******************
//Ideally, I think, the line below would replace the contents of
//viewControllers with the new controllers. Here is where I get the
//"objc[10801]: FREED(id): message release sent to freed object=0x3f4a490"
//error. This line should probably be placed after [self loadData] or something,
//but it crashes so I put but here to display better. I tried
//adding self.viewControllers = nil; but I don't think that is
//the problem with the error message.
self.viewControllers = controllers;
}
-(void)立即重新加载数据
{
对于(UIView*子视图在[scrollView子视图]中){
[子视图从SuperView移除];
NSLog(@“删除了suview”);
}
[self-loadData];//此方法获取将要删除的数据
//在scrollView中。它基于
//在返回结果和我存储的NSMutableArray上
//要传递到将显示在scrollView中的视图的数据
NSMutableArray*控制器=[[NSMutableArray alloc]init];
for(无符号i=0;i