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我想将一个表视图“固定”到它的容器上,即视图控制器的视图。由于 UIView 没有锚属性,我尝试使用 layoutMarginsGuide 来完成。

UIView 不提供布局边距属性的锚属性。相反, layoutMarginsGuide 属性提供了一个 UILayoutGuide 对象来表示这些边距。使用指南的锚属性来创建您的约束。

        let margins = self.view.layoutMarginsGuide
    self.tableView.leadingAnchor.constraintEqualToAnchor(margins.leadingAnchor).active = true
    self.tableView.trailingAnchor.constraintEqualToAnchor(margins.trailingAnchor).active = true

但是运行此代码我收到以下错误:

** Terminating app due to uncaught exception 'NSGenericException', reason:   'Unable to activate constraint with items <UITableView: 0x7fdfd0ab5e00; frame = (0 0; 768 1024); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x7fdfd8452e00>; layer = <CALayer: 0x7fdfd84c11c0>; contentOffset: {0, 0}; contentSize: {0, 0}> and <UILayoutGuide: 0x7fdfd86d7ca0 - "UIViewLayoutMarginsGuide", layoutFrame = {{0, 0}, {0, 0}}, owningView = <UIView: 0x7fdfd75a8aa0; frame = (0 0; 768 1024); autoresize = W+H; layer = <CALayer: 0x7fdfd0409270>>> because they have no common ancestor.  Does the constraint reference items in different view hierarchies?  That's illegal.'

重要的部分:

    ...because they have no common ancestor.  Does the constraint reference items in different view hierarchies?  That's illegal.'

但这应该如何工作?

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1 回答 1

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首先将约束更改为这样 self.tableView.leftAnchor.constraintEqualToAnchor(view.leftAnchor).active = true self.tableView.rightAnchor.constraintEqualToAnchor(view.rightAnchor).active = true

如果问题仍然存在,请确保将 tableview 添加为视图的子视图

view.addSubview(tableView)
于 2016-06-01T00:21:57.107 回答