Question

我在UIProgressView中放置了UITableViewCell。我面临两个问题：
1. UITableView卷轴受到阻碍 2.每次（显然）调用UIProgressView setProgress ，每次出现时都会设置进度。

问题1 因问题2 而发生，这是可以理解的。为了测试这一点，我对UIProgressView中的UITableViewCell进行了评论。滚动速度非常快。
这是UIProgressView的代码：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
        static NSString *CellIdentifier = @"Cell";

        SWTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

        if (cell == nil)
        {
            cell = [[SWTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
            cell.backgroundColor =  [UIColor clearColor];

            cell.selectionStyle = UITableViewCellSelectionStyleNone;
            cell.accessoryType = UITableViewCellAccessoryNone;
            if ([cell respondsToSelector:@selector(layoutMargins)]) {
                cell.layoutMargins = UIEdgeInsetsZero;
                cell.preservesSuperviewLayoutMargins = false;
            }
        }
        else
        {
            NSArray *arr = [cell.contentView subviews];
            for(int i=0; i<[arr count]; i++)
            {
                UIView *view = [arr objectAtIndex:i];
                [view removeFromSuperview];
            }
        }

CustomerArticleDetail *customerArticleDetails = [arrDetails objectAtIndex:indexPath.row];  
...  
...  
UIProgressView *progressView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
            [progressView setProgressTintColor:[UIColor colorWithRed:31.0/255 green:177.0/255 blue:137.0/255 alpha:1.0]];
            [[progressView layer]setCornerRadius:5.0f];
            [[progressView layer]setBorderWidth:2.0f];
            [[progressView layer]setMasksToBounds:TRUE];
            progressView.clipsToBounds = YES;
            [[progressView layer]setFrame:CGRectMake(50, 93, self.view.frame.size.width - 55, 8)];[[progressView layer]setBorderColor:[UIColor whiteColor].CGColor];

            progressView.trackTintColor = [UIColor colorWithRed:233.0/255.0 green:233.0/255.0 blue:233.0/255.0 alpha:1.0];

            [progressView setProgress: ([customerArticleDetails.Logged_Hours floatValue]/[customerArticleDetails.Planned_Hours floatValue]) animated:YES];
            [cell.contentView addSubview:progressView]; 
...  
... 
return cell;
    }

Answer 1

每次需要渲染时，在单元格中添加UIViews总是禁止和错误的。

通过这种方式，您可以删除可重用单元格的用途，并且滚动非常糟糕。每次浏览所有子视图并删除所有子视图的成本甚高应该这样做的方法是创建一次进度视图，然后根据需要刷新进度。

这有两种方式。

如果你有自己的服装细胞：

在单元格中创建UIProgress视图，只调用set progress：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    SWTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil)
    {
        cell = [[SWTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        cell.backgroundColor =  [UIColor clearColor];

        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        cell.accessoryType = UITableViewCellAccessoryNone;
        if ([cell respondsToSelector:@selector(layoutMargins)]) {
            cell.layoutMargins = UIEdgeInsetsZero;
            cell.preservesSuperviewLayoutMargins = false;
        }
    }

    // Animated YES is maybe a fine idea to be more nice, but it could be better if you use NO.
    [cell.progressView setProgress: ([customerArticleDetails.Logged_Hours floatValue]/[customerArticleDetails.Planned_Hours floatValue]) animated:YES]; 
}

如果您不拥有该单元格，则需要在此方法中创建视图。

这样的事情：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    SWTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil)
    {
        cell = [[SWTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        cell.backgroundColor =  [UIColor clearColor];

        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        cell.accessoryType = UITableViewCellAccessoryNone;
        if ([cell respondsToSelector:@selector(layoutMargins)]) {
            cell.layoutMargins = UIEdgeInsetsZero;
            cell.preservesSuperviewLayoutMargins = false;
        }

        UIProgressView *progressView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
        [progressView setProgressTintColor:[UIColor colorWithRed:31.0/255 green:177.0/255 blue:137.0/255 alpha:1.0]];
        [[progressView layer]setCornerRadius:5.0f];
        [[progressView layer]setBorderWidth:2.0f];
        [[progressView layer]setMasksToBounds:TRUE];
        progressView.clipsToBounds = YES;
        [[progressView layer]setFrame:CGRectMake(50, 93, self.view.frame.size.width - 55, 8)];[[progressView layer]setBorderColor:[UIColor whiteColor].CGColor];

        progressView.trackTintColor = [UIColor colorWithRed:233.0/255.0 green:233.0/255.0 blue:233.0/255.0 alpha:1.0];
        [progressView setTeg:10];
        [cell.contentView addSubview:progressView]; 
    }


    UIProgressView *progressView = [cell.contentView viewWithTag:0]


    // Animated YES is maybe a fine idea to be more nice, but it could be better if you use NO.
    [progressView setProgress: ([customerArticleDetails.Logged_Hours floatValue]/[customerArticleDetails.Planned_Hours floatValue]) animated:YES]; 
}

这样您可以创建一次UIProgressview（因此没有滚动问题），只需单独设置每个单元格的进度。

在UITableViewCell中放置UIProgressView时出现问题

1 个答案: