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[英]Get dynamic height of UiWebview in collapse/expand tableview in iOS
[英]get dynamic UIWebview content height of a expand/collapse UITableView in iOS
我在展开/折叠UITableView
加载UIWebview
。 我需要根据UIWebview
内容高度更改行高。 如果我设置了UIWebview
在委托UITableview
中, UIWebview
delgate方法不断得到调用一遍又一遍。 我正在调用webviewDidFinishLoad方法来获取内容的高度。 任何形式的帮助/建议都将不胜感激。
- (BOOL)tableView:(UITableView *)tableView canCollapseSection:(NSInteger)section
{
return YES;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return self.restauRantMenuArray.count;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if ([self tableView:self.restaurantMenuTableView canCollapseSection:section])
{
if ([expandedSections containsIndex:section])
{
return 2; // return rows when expanded
}
return 1; // only top row showing
}
// Return the number of rows in the section.
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([self tableView:self.restaurantMenuTableView canCollapseSection:indexPath.section])
{
if (indexPath.row == 0)
{
static NSString *MyIdentifier = @"menuTitleCell";
RestaurantMenuTitleTableViewCell *cell =(RestaurantMenuTitleTableViewCell*) [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
if (cell == nil) {
cell = [[RestaurantMenuTitleTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier];
NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"RestaurantMenuTitleTableViewCell" owner:self options:nil];
cell = [topLevelObjects objectAtIndex:0];
}
RestaurantMenuItemObject *object = [self.restauRantMenuArray objectAtIndex:indexPath.section];
cell.titleWebView.opaque = NO;
cell.titleWebView.backgroundColor = [UIColor clearColor];
[cell.titleWebView loadHTMLString:object.menuTitle baseURL:nil];
cell.titleWebView.scrollView.scrollEnabled = NO;
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
cell.backgroundColor = [UIColor whiteColor];
return cell;
}
else
{
static NSString *MyIdentifier = @"menuContentCell";
RestaurantMenuContentTableViewCell *cell =(RestaurantMenuContentTableViewCell*) [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
if (cell == nil) {
cell = [[RestaurantMenuContentTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier];
NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"RestaurantMenuContentTableViewCell" owner:self options:nil];
cell = [topLevelObjects objectAtIndex:0];
}
RestaurantMenuItemObject *object = [self.restauRantMenuArray objectAtIndex:indexPath.section];
cell.contentWebView.tag = indexPath.section + 1000;
cell.contentWebView.opaque = NO;
cell.contentWebView.backgroundColor = [UIColor clearColor];
[cell.contentWebView loadHTMLString:object.menuContent baseURL:nil];
//cell.contentWebView.scrollView.delegate = self;
[cell.contentWebView.scrollView setShowsHorizontalScrollIndicator:NO];
// cell.contentWebView.scrollView.scrollEnabled = NO;
//cell.contentWebView.delegate = self;
if([[self.imageHeightArray objectAtIndex:indexPath.section] isEqualToString:@"150"])
{
//cell.contentWebView.delegate = self;
}
// first row
//cell.textLabel.text = @"Expandable"; // only top row showing
if ([expandedSections containsIndex:indexPath.section])
{
//cell.accessoryView = [DTCustomColoredAccessory accessoryWithColor:[UIColor grayColor] type:DTCustomColoredAccessoryTypeUp];
}
else
{
//cell.accessoryView = [DTCustomColoredAccessory accessoryWithColor:[UIColor grayColor] type:DTCustomColoredAccessoryTypeDown]
}
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.backgroundColor = [UIColor clearColor];
return cell;
}
}
else
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.backgroundColor = [UIColor clearColor];
return cell;
}
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
RestaurantMenuItemObject *object = [self.restauRantMenuArray objectAtIndex:indexPath.section];
UIWebView *thisWebView = (UIWebView*)[self.restaurantMenuTableView viewWithTag:indexPath.section+1000];
[thisWebView loadHTMLString:object.menuContent baseURL:nil];
thisWebView.delegate = self;
//[tableView deselectRowAtIndexPath:indexPath animated:YES];
//if there is any previous selected index
//if selected index is not the previous selected
if (selectedIndex && (selectedIndex.section != indexPath.section)) {
[self collapseOrExpandForIndexPath:selectedIndex inTableView:tableView];
}
if ([selectedIndex isEqual:indexPath]) {
selectedIndex = nil;
}
else{
selectedIndex = [NSIndexPath indexPathForRow:0 inSection:indexPath.section];
}
if ([self tableView:tableView canCollapseSection:indexPath.section])
{
[self collapseOrExpandForIndexPath:indexPath inTableView:tableView];
if (indexPath.row == 0) {
[tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
}
}
- (void)collapseOrExpandForIndexPath:(NSIndexPath *)indexPath inTableView:(UITableView *)tableView{
if (!indexPath.row)
{
// only first row toggles exapand/collapse
//[tableView deselectRowAtIndexPath:indexPath animated:YES];
NSInteger section = indexPath.section;
BOOL currentlyExpanded = [expandedSections containsIndex:section];
NSInteger rows;
NSMutableArray *tmpArray = [NSMutableArray array];
if (currentlyExpanded)
{
rows = [self tableView:tableView numberOfRowsInSection:section];
[expandedSections removeIndex:section];
}
else
{
[expandedSections addIndex:section];
rows = [self tableView:tableView numberOfRowsInSection:section];
}
for (int i=1; i<rows; i++)
{
NSIndexPath *tmpIndexPath = [NSIndexPath indexPathForRow:i
inSection:section];
[tmpArray addObject:tmpIndexPath];
}
if (currentlyExpanded)
{
[tableView deleteRowsAtIndexPaths:tmpArray
withRowAnimation:UITableViewRowAnimationTop];
}
else
{
//RestaurantMenuItemObject *object = [self.restauRantMenuArray objectAtIndex:indexPath.section];
// UIWebView *thisWebView = (UIWebView*)[self.restaurantMenuTableView viewWithTag:indexPath.section+1000];
//
// [thisWebView loadHTMLString:object.menuContent baseURL:nil];
//
// thisWebView.delegate = self;
[tableView insertRowsAtIndexPaths:tmpArray
withRowAnimation:UITableViewRowAnimationTop];
}
}
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
//return UITableViewAutomaticDimension;
if(indexPath.row == 0)
return 50.00;
else
{
return 240;//[[self.imageHeightArray objectAtIndex:indexPath.section] integerValue];
}
}
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
return 1.00;
}
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
return 1.00;
}
IMP:如果计算出的高度超过最大高度,也要设置最大Web视图高度,将计算出的高度设置为最大高度。 并启用Web视图滚动,以便用户能够查看所有Web视图内容。
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