2012-06-27 60 views
0

我有一個UITableView,它有18個部分,每個部分有1個標題頭和1個單元格。在每個單元格中,都會有一個水平的UIScrollView,其中包含多個圖像。UITableViewCell重用和圖像重新呈現

問題是...我可以正確加載圖像和單元格,但是當圖像數量增加並且單元格滾動到頂部時,會有其他單元格中彈出的圖像...以及所有渲染和圖像都是錯誤的......圖像應該在第3節或第4節出現在第1節......等。

數據源從JSON加載,並且JSON是正確的。當圖像不多並且只有5-8個部分時,一切都很完美。所以,它導致我相信這是產生這個問題的UITableViewCell的重用。

能有人給我一隻手搭在這...感謝..下面是UITableViewCell的

// Customize the appearance of table view cells. 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 

UITableViewCell *cell = nil; 

// add a placeholder cell while waiting on table data 
if ([self.datasource count] == 0 && indexPath.section == 0 && indexPath.row == 0) 
{ 
    UILabel *Fetch; 
    static NSString *infoCell = @"infoCell"; 
    cell = [tableView dequeueReusableCellWithIdentifier:infoCell]; 
    if (cell == nil) 
    { 
     cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle 
             reuseIdentifier:infoCell] autorelease]; 
     cell.selectionStyle = UITableViewCellSelectionStyleNone; 

     CellFetch = [[[UILabel alloc] initWithFrame:CGRectMake(15.0, 120.0, 280.0, 80.0)] autorelease]; 
     CellFetch.tag = FETCH_TAG; 
     CellFetch.font = [UIFont boldSystemFontOfSize:16.0]; 
     CellFetch.textColor = [UIColor grayColor]; 
     CellFetch.shadowColor = [UIColor whiteColor]; 
     CellFetch.shadowOffset = CGSizeMake(0, -0.5); 
     CellFetch.textAlignment = UITextAlignmentCenter; 
     [cell.contentView addSubview:CellFetch]; 
    } else { 
     CellFetch = (UILabel *)[cell.contentView viewWithTag:FETCH_TAG]; 
    } 
    Fetch.text = fetchStatus; 
    return cell; 
} else { 
UIScrollView *imgScroll; 
static NSString *imgCell = @"imgCell"; 
cell = [tableView dequeueReusableCellWithIdentifier:imgCell]; 
if (cell == nil) { 
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:imgCell] autorelease]; 
    cell.selectionStyle = UITableViewCellSelectionStyleNone; 

    imgScroll = [[[UIScrollView alloc] initWithFrame:CGRectMake(0.0, 0.0, 320, 108.0)]autorelease]; 
    imgScroll.tag = SCROLLVIEW_TAG; 
    imgScroll.showsVerticalScrollIndicator = NO; 
    imgScroll.showsHorizontalScrollIndicator = NO; 
} else { 
    imgScroll = (UIScrollView *)[cell.contentView viewWithTag:SCROLLVIEW_TAG]; 
} 
    NSArray *sorted = [[self.datasource allKeys] sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)]; 
    //NSArray *allDistrict = [self.datasource allValues]; 
    NSString *key = [sorted objectAtIndex:indexPath.section]; 
    NSArray *img = [self.datasource valueForKey:key]; 

    int column = 0; 
    int space = 10; 
    int width = 80; 
    int x = space+5.0; 
    for (NSUInteger i=0; i < img.count; i++) { 
     UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom]; 
     NSDictionary *Info = [img objectAtIndex:i]; 
     NSString *iconURL = [NSString stringWithFormat:@"%@",[Info objectForKey:@"ImgURL"]]; 
     button.frame = CGRectMake(x , 4, 80, 80); 
     [button setImageWithURL:[NSURL URLWithString:iconURL] placeholderImage:[UIImage imageNamed:@"pholder"]]; 
     NSString *imgID = [Info objectForKey:@"ImgID"]; 
     int k = [imgID intValue]; 
     button.tag = k; 
     [button addTarget:self action:@selector(onButtonPressed:) forControlEvents:UIControlEventTouchUpInside]; 
     [imgScroll addSubview:button]; 


     x+=space+width; 
     column++; 
    } 

    [imgScroll setContentSize:CGSizeMake(column*90+10, 108)]; 

    [cell.contentView addSubview:imgScroll]; 
} 
// Configure the cell... 
return cell; 

}

回答

1

嘗試使你的小區標識唯一的,這樣的方式,他們將不會跨節重用每個部分:

cell = [tableView dequeueReusableCellWithIdentifier:@"section1cell"]; 

    cell = [tableView dequeueReusableCellWithIdentifier:@"section2cell"]; 

我已經看到了問題,即細胞某些部分沒有圖像,但在其他部分中沒有圖像。因此,當它重新使用單元格時,除非您專門將圖像屬性設置爲零,否則您可能會獲得之前已成像的圖像。

UPDATE:

這裏是我的問候談論到款數

- (UITableViewCell *)tableView:(UITableView *)tableView 
    cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{  
    NSString *section = [NSString stringWithFormat:@"section%@cell", indexPath.section]; 

    UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:section]; 

    // some configuration 

    return cell; 
} 
+0

感謝...但部分計數動態的,所以我不知道有多少節,直到json加載...所以,這個解決方案將無法工作 –

+1

該節包含在傳遞給委託方法的indexPath「cellForRowAtIndexPath:(NSIndexPath *)indexPath」並可以從indexPath.section – jerrylroberts

+0

獲得它完美的工作,謝謝!= D –

0

[cell.contentView addSubview:imgScroll];cell == nil部分的代碼。

一樣,

 if (cell == nil) 
{ 

     cell = [[[UITableViewCell alloc] nitWithStyle:UITableViewCellStyleDefault reuseIdentifier:imgCell] autorelease]; 
     cell.selectionStyle = UITableViewCellSelectionStyleNone; 

     imgScroll = [[[UIScrollView alloc] initWithFrame:CGRectMake(0.0, 0.0, 320, 108.0)]autorelease]; 
     imgScroll.tag = SCROLLVIEW_TAG; 
     imgScroll.showsVerticalScrollIndicator = NO; 
     imgScroll.showsHorizontalScrollIndicator = NO; 
     [cell.contentView addSubview:imgScroll]; 

} 
+0

謝謝...但沒有工作=( –