UITableViewStyleGrouped 默认标题视图? [英] UITableViewStyleGrouped default header view?

问题描述

我正在尝试实现一个用于删除整个部分的控件，如果删除按钮位于标题中，而不是像 UIPopoverView 这样的叠加层，那么它在我的应用中看起来最好.

I'm trying to implement a control for deleting entire sections, and it would look best in my app if the delete button was in the header, as opposed to an overlay like a UIPopoverView.

在写这个问题的过程中，我找到了答案.很简单，一旦有了起点.

In the process of writing this question, I found the answer. Easy enough, once there's a starting point.

推荐答案

我从 这个博客只有两篇博文，都是 2010 年的.
然后我又回到这个网站 只是为了字体颜色，因为它更麻烦分开.

I got the bulk of the code from this blog which has only two posts, both from 2010.
Then I went back to this site just for the font color, since it's more trouble to break apart.

三个小问题，都与标签有关.

Three minor problems, all with the label.

- Font is too narrow
- Text color is too dark
- Label origin is wrong

默认字体是已知的，所以先来.

The default font is known, so that comes first.

label.font = [UIFont boldSystemFontOfSize:17.0];

接下来是颜色，因为这很容易.为此使用了图像编辑器的吸管工具.

Color is next, since that's easy. Used an image editor's Eyedropper tool for this.

label.textColor = [UIColor colorWithRed:0.298 green:0.337 blue:0.423 alpha:1];
// Is there a difference between alpha:1 and alpha:1.000?

然后是困难的部分.近似猜测，然后进行一些调整以获得完美匹配.

Then the hard part. A close guess, and then some tweaking for a perfect match.

label.frame = CGRectMake(54, 4, headerView.frame.size.width-20, 22);

现在我们有了一个与当前 Grouped 标头完美匹配的自定义实现.

And now we have a custom implementation that perfectly matches the current Grouped header.

完成代码:

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
    UIView *headerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, tableView.frame.size.width, 40)];
    tableView.sectionHeaderHeight = headerView.frame.size.height;

    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(54, 4, labelSize.width, labelSize.height)];
    [label setBackgroundColor:[UIColor clearColor]];
    [label setFont:[UIFont boldSystemFontOfSize:17.0]];
    [label setShadowColor:[UIColor whiteColor]];
    [label setShadowOffset:CGSizeMake(0, 1)];
    [label setText:[self tableView:tableView titleForHeaderInSection:section]];
    [label setTextColor:[UIColor colorWithRed:0.298 green:0.337 blue:0.423 alpha:1.000]];
    [headerView addSubview:label];

    return headerView;
}

在找到正确的字体/颜色后找到这个SO答案我.哦，好吧.

Found this SO answer after finding the right font/color myself. Oh well.

对于允许有效无限数量文本的标题标签:

For a title label that allows an effectively unlimited amount of text:

// before label init
NSString *title = [self tableView:tableView titleForHeaderInSection:section];
NSUInteger maxWidth = headerView.frame.size.width-108;
CGSize labelSize = [title sizeWithFont:[UIFont systemFontOfSize:17.0]
                     constrainedToSize:CGSizeMake(maxWidth, CGFLOAT_MAX)];
if (labelSize.width < maxWidth) labelSize.width = maxWidth;

// after setFont:
[label setNumberOfLines:0];

这篇关于UITableViewStyleGrouped 默认标题视图?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！