滾動時UITableviewCell問題

Question

我動態創建了表視圖，在cellForRowAtIndexPath中，我在單元格上添加了一個自定義按鈕作為子視圖

if ([deviceNameArray count]!=0)
{
    pairButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    pairButton.frame = CGRectMake(230.0f, 10.0f, 70.0f, 25.0f);
    [pairButton setTitle:@"Connect" forState:UIControlStateNormal];
    pairButton.titleLabel.textColor = [UIColor lightGrayColor];
    pairButton.titleLabel.textAlignment = NSTextAlignmentCenter;
    pairButton.titleLabel.font = [UIFont fontWithName:@"arial" size:10];

    pairButton.tag = indexPath.row;

    [pairButton addTarget:self action:@selector(connectToDevice:) forControlEvents:UIControlEventTouchUpInside];
    [cell addSubview:pairButton];
    isPairButtonAdded = YES;

}

使用我的另一台設備成功后，我已將設備的按鈕標題更改為斷開連接。 現在問題是每當我滾動我的表斷開連接但我不想發生這樣的事情，我知道它由於細胞娛樂如何停止重建細胞。

Answer 1

您必須在陣列中存儲已連接和斷開連接的設備的記錄，然后您可以像這樣管理您的單元

if ([deviceNameArray count]!=0)
{
    pairButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    pairButton.frame = CGRectMake(230.0f, 10.0f, 70.0f, 25.0f);

    if([device isConnected]) // Get object from array and check is it coonected or disconnected
    {
       [pairButton setTitle:@"Connect" forState:UIControlStateNormal];
    }
    else
    {
        [pairButton setTitle:@"Disconnected" forState:UIControlStateNormal];
    }
pairButton.titleLabel.textColor = [UIColor lightGrayColor];
pairButton.titleLabel.textAlignment = NSTextAlignmentCenter;
pairButton.titleLabel.font = [UIFont fontWithName:@"arial" size:10];

pairButton.tag = indexPath.row;

[pairButton addTarget:self action:@selector(connectToDevice:) forControlEvents:UIControlEventTouchUpInside];
[cell addSubview:pairButton];
isPairButtonAdded = YES;

}

Answer 2

你不能在cellForRowAtIndexPath:這樣做：

// dequeue cell
if (!cell) {
    // create cell
}
// create button

相反，您必須在單元格創建塊內創建按鈕。 否則，每次單元格出現在屏幕上時，將再次創建一個新按鈕。

Answer 3

只是我解決了這個問題，在我正在檢查的條件下裝箱我的按鈕

if (cell == nil) {
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];

    if ([deviceNameArray count]!=0)
    {
        pairButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        pairButton.frame = CGRectMake(230.0f, 10.0f, 70.0f, 25.0f);
        [pairButton setTitle:@"Connect" forState:UIControlStateNormal];
        pairButton.titleLabel.textColor = [UIColor lightGrayColor];
        pairButton.titleLabel.textAlignment = NSTextAlignmentCenter;
        pairButton.titleLabel.font = [UIFont fontWithName:@"arial" size:10];

        pairButton.tag = indexPath.row;

        [pairButton addTarget:self action:@selector(connectToDevice:) forControlEvents:UIControlEventTouchUpInside];
        [cell addSubview:pairButton];
        isPairButtonAdded = YES;

    }

現在它解決了