无法缩进UITableViewCell子类 [英] Can't indent UITableViewCell subclass

问题描述

我已经将UITableViewCell子类化为创建一个带有按钮和2个标签的自定义单元格。使用Dave Mark的Beginning iPhone Development中概述的模式从xib加载单元定义。以下是基本代码：

I have subclassed UITableViewCell to create a custom cell with a button and 2 labels. The cell definition is loaded from a xib using the pattern outlined in Dave Mark's Beginning iPhone Development. Here's the essential code:

    NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"MarketItemCustomCell" owner:self options:nil];

    for (id oneObject in nib)
    {
        if ([oneObject isKindOfClass:[MarketItemCustomCell class]])
        {
            cell = (MarketItemCustomCell *)oneObject;
            break;
        }
    }

标签和按钮按预期显示，但缩进级别不受尊重。我已经实现了如下所示的indentationLevelForRowAtIndexPath，但是单元格仍然一直向左对齐。

The labels and button display as expected but the indentation level is not respected. I have implemented indentationLevelForRowAtIndexPath like below, but the cell is still aligned all the way to the left.

- (NSInteger)tableView:(UITableView *)tableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath
    {
        <snip/>
        return 5;
    }

请注意，当我不使用自定义单元格时，缩进级别正常工作。

Note that the indentation level works fine when I'm not using a custom cell.

任何提示？

推荐答案

iOS更新8：以下代码由于某种原因不再有效

Update for iOS 8: The code below no longer works for some reason

iOS 8的替代建议：

考虑创建一个AutoLayout约束来表示缩进左边距

Consider creating an AutoLayout constraint to represent the indenting left margin

在运行时，修改此约束以更改缩进级别

At runtime, modify this constraint to change the indent level

如果您有自定义UITableViewCell子类，则此子类可以将IBOutlet映射到约束。 （不幸的是Apple没有提供findConstraintByTag / Id函数）

If you have a custom UITableViewCell subclass, this subclass can have an IBOutlet mapped to the constraint. (Unfortunately Apple did not provide a findConstraintByTag/Id function)

可以修改NSLayoutConstraint的具有讽刺意义的常量属性来更改缩进级别。

The ironically named "constant" property of the NSLayoutConstraint can be modified to change the indent level.

对于iOS 7，这有效（但不应再推荐）

基于vodkhang的建议，我在我的UITableViewCell子类中实现了以下解决方案。不确定这是否是最佳解决方案，但似乎工作正常。

Based on vodkhang's suggestion, I implemented the following solution in my UITableViewCell sublass. Not sure if this is the best solution but it appears to work fine.

- (void)layoutSubviews
{
    [super layoutSubviews];

    float indentPoints = self.indentationLevel * self.indentationWidth;

    self.contentView.frame = CGRectMake(indentPoints,
                                          self.contentView.frame.origin.y,
                                          self.contentView.frame.size.width - indentPoints, 
                                          self.contentView.frame.size.height);
}

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