我有2000条记录,我必须在UITableView
中只显示15条记录,当用户滚动UITableView
时,需要在表格中加载更多15条记录。我该怎么办?
答案 0 :(得分:5)
我认为答案是:- (void)scrollViewDidScroll:(UIScrollView *)scrollView
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGPoint offset = scrollView.contentOffset;
CGRect bounds = scrollView.bounds;
CGSize size = scrollView.contentSize;
UIEdgeInsets inset = scrollView.contentInset;
float y = offset.y + bounds.size.height - inset.bottom;
float h = size.height;
float reload_distance = 15;
if(y > h + reload_distance)
{
//Call the Method to load More Data...
}
}
希望它会有所帮助...... !!!
答案 1 :(得分:2)
您必须检查UIScrollView
contentOffset
(UITableView
建立在UIScrollView
)。所以,将此添加到您的UITableViewDelegate
班级:
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
// when reaching bottom, load more
float offs = (scrollView.contentOffset.y+scrollView.bounds.size.height);
float val = (scrollView.contentSize.height);
if (offs==val)
{
//add more data on your data array
}
}
当用户到达表格视图的底部时,为了向表格中添加更多单元格。
答案 2 :(得分:1)
您可以使用UIScrollView
的两种委托方法。当UITableView
出现在UIScrollView
的层次结构中时,您将获得UIScrollView
的委托方法的控制权。
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
NSLog(@"TableView scrolling");
}
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
NSLog(@"TableView Started scrolling");
}
尝试以上两种方法。并选择适合您的。首先看看当您开始滚动NSLog
时UITableVIew
的来历。然后在其中编写代码。
答案 3 :(得分:1)
默认numberOfItemsToDisplay = 15;
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
if (numberOfItemsToDisplay >= [self.yourArray count])
{
numberOfItemsToDisplay = [self.yourArray count];
return 1;
}
return 2;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (section == 0)
{
return numberOfItemsToDisplay;
}
else
{
return 1;
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.section == 0)
{
static NSString *CellIdentifier = @"YourCustomCell";
YourCustomCell *objYourCustomCell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (objYourCustomCell == nil)
{
NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"YourCustomCell" owner:self options:nil];
for(id currentObject in topLevelObjects)
{
if ([currentObject isKindOfClass:[YourCustomCell class]])
{
objYourCustomCell = (AlertsCustomCell *) currentObject;
break;
}
}
}
objYourCustomCell.lbl.text = [[self.yourArray objectAtIndex:indexPath.row]valueForKey:@"vName"];
return objYourCustomCell;
}
else
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
[cell.contentView addSubview:[self loadMoreViewForTable:self.view]];
}
return cell;
}
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self.tblAlertsList deselectRowAtIndexPath:indexPath animated:YES];
if (indexPath.section == 1)
{
numberOfItemsToDisplay = [self loadMore:numberOfItemsToDisplay arrayTemp:self.yourArray tblView:self.tblAlertsList];
[self.tblAlertsList endUpdates];
}else
{
// action if it is not LoadMore
}
}
+ (NSInteger)loadMore : (NSInteger)numberOfItemsToDisplay arrayTemp:(NSMutableArray*)aryItems tblView:(UITableView*)tblList
{
int count =0;
NSUInteger i, totalNumberOfItems = [aryItems count];
NSUInteger newNumberOfItemsToDisplay = MIN(totalNumberOfItems, numberOfItemsToDisplay + kNumberOfItemsToAdd);
NSMutableArray *indexPaths = [[NSMutableArray alloc] init];
for (i=numberOfItemsToDisplay; i<newNumberOfItemsToDisplay; i++)
{
count++;
[indexPaths addObject:[NSIndexPath indexPathForRow:i inSection:0]];
}
numberOfItemsToDisplay = newNumberOfItemsToDisplay;
[tblList beginUpdates];
[tblList insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationLeft];
if (numberOfItemsToDisplay == totalNumberOfItems) {
[tblList deleteSections:[NSIndexSet indexSetWithIndex:1] withRowAnimation:UITableViewRowAnimationLeft];
}
NSIndexPath *scrollPointIndexPath;
if (newNumberOfItemsToDisplay < totalNumberOfItems)
{
scrollPointIndexPath = [NSIndexPath indexPathForRow:numberOfItemsToDisplay-kNumberOfItemsToAdd inSection:0];
}
else
{
scrollPointIndexPath = [NSIndexPath indexPathForRow:i-count inSection:0];
}
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 100000000), dispatch_get_main_queue(), ^(void){
[tblList scrollToRowAtIndexPath:scrollPointIndexPath atScrollPosition:UITableViewScrollPositionNone animated:YES];
});
return numberOfItemsToDisplay;
}
我必须使用自定义单元格来使用此方法吗?我只采用了UItableview
答案 4 :(得分:1)
试试这个:
http://www.cocoacontrols.com/controls/stableviewcontroller
使用这两种方法
//for refresh
- (void) addItemsOnTop {
//[self getLoginFollowingUserVideosCall];
[self refreshCompleted];
}
//for load more
- (void) addItemsOnBottom {
//[self getLoginFollowingUserVideosCall];
[self loadMoreCompleted];
}
答案 5 :(得分:0)
您需要做的是懒洋洋地加载tableview数据。类似于当前可见的tableview单元的加载数据&amp;并非一次全部数据。