[英]UITableView contentOffset resets after UIScrollView scrolls
[英]ContentOffset issue in UIScrollView in UITableView
我已經在UITableView的每個UITableViewCell中添加了一個UIScrollView。
這是我的代碼。
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString* CellIdentifier = @"Cell";
UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
UIScrollView *propertyScrollView;
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
propertyScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, tableView.frameWidth, 100)];
[propertyScrollView setContentSize:CGSizeMake(10*tableView.frameWidth, 100)];
[propertyScrollView setPagingEnabled:YES];
propertyScrollView.delegate = self;
propertyScrollView.tag = indexPath.row;
[[cell contentView] addSubview:propertyScrollView];
propertyScrollView.backgroundColor = [UIColor blackColor];
int pagingIndex = [[m_pagingIndexArray objectAtIndex:indexPath.row]intValue];
[propertyScrollView setContentOffset:CGPointMake(pagingIndex*propertyScrollView.frameWidth, 0)];
for(int i=0;i<10;i++)
{
UIButton *singleImage = [[UIButton alloc]initWithFrame:CGRectMake(i*tableView.frameWidth, 0, propertyScrollView.frameWidth, propertyScrollView.frameHeight)];
[propertyScrollView addSubview:singleImage];
singleImage.titleLabel.text = [NSString stringWithFormat:@"%d",i];
singleImage.titleLabel.textColor = [UIColor blackColor];
singleImage.titleLabel.font = systemFontBoldTypeOfSize(20);
[singleImage setImage:[horizentalImagesArray objectAtIndex:i] forState:UIControlStateNormal];
singleImage.backgroundColor = [UIColor whiteColor];
}
else
{
propertyScrollView.tag = indexPath.row;
int pagingIndex = [[m_pagingIndexArray objectAtIndex:indexPath.row]intValue];
[propertyScrollView setContentOffset:CGPointMake(pagingIndex*propertyScrollView.frameWidth, 0)];
}
return cell;
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
int pageIndex = scrollView.contentOffset.x/scrollView.frameWidth;
[m_pagingIndexArray replaceObjectAtIndex:scrollView.tag withObject:[NSString stringWithFormat:@"%d",pageIndex]];
}
- (void)viewDidLoad {
[super viewDidLoad];
m_pagingIndexArray = [[NSMutableArray alloc]init];
for(int i=0;i<10;i++)
{
[m_pagingIndexArray addObject:@"0"];
}
}
我在一個UIScrollView(啟用分頁)中添加10個UIButton。
問題是,如果我滾動UITableViewCell的任一滾動視圖並移至底部單元格,則可以看到其他UITableViewCell的滾動視圖也滾動到了該內容偏移點。
我希望所有UITableview單元的UIScrollView都可以獨立滾動。 我該如何實現? 請幫助我解決此問題。
您將當前頁碼保留在m_pagingIndexArray中,並且所有單元都使用相同的數組,因此假設它包含的頁號為3,那么它將適用於所有單元。
另外,如果要重復使用每個單元格的每個按鈕的文本和圖像(如我在下面添加的那樣),
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell* cell = nil;
UIScrollView *propertyScrollView;
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
propertyScrollView = [[[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, tableView.frameWidth, 100)] autorelease];
[propertyScrollView setContentSize:CGSizeMake(10*tableView.frameWidth, 100)];
[propertyScrollView setPagingEnabled:YES];
propertyScrollView.delegate = self;
propertyScrollView.tag = indexPath.row;
[[cell contentView] addSubview:propertyScrollView];
propertyScrollView.backgroundColor = [UIColor blackColor];
int pagingIndex = [[m_pagingIndexArray objectAtIndex:indexPath.row]intValue];
[propertyScrollView setContentOffset:CGPointMake(pagingIndex*propertyScrollView.frameWidth, 0)];
for(int i=0;i<10;i++)
{
UIButton *singleImage = [[[UIButton alloc]initWithFrame:CGRectMake(i*tableView.frameWidth, 0, propertyScrollView.frameWidth, propertyScrollView.frameHeight)] autorelease];
[propertyScrollView addSubview:singleImage];
singleImage.titleLabel.text = [NSString stringWithFormat:@"%d",i];
singleImage.titleLabel.textColor = [UIColor blackColor];
singleImage.titleLabel.font = systemFontBoldTypeOfSize(20);
[singleImage setImage:[horizentalImagesArray objectAtIndex:i] forState:UIControlStateNormal];
singleImage.backgroundColor = [UIColor whiteColor];
}
return cell;
}
如果單元格沒有被重用,您的代碼是正確的,但是當單元格被重用時,您需要為每個單元格的滾動視圖設置內容偏移(如果它們被重用)。
您需要編寫其他情況-
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if(cell == nil)
{
// your code
}
else
{
// reset the content offset of the scroll view as per your needs for the reused cells
}
return cell;
}
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