swift - ios8 swift : how can i access/edit/remove default/private inputAccessoryView height constraint '_UIKBAutolayoutHeightConstraint'

Question

我想让 inputAccessoryView 随着内部 UITextView 的增长而扩展。inputAccessoryView 有一个带有标识符 '_UIKBAutolayoutHeightConstraint' 的私有(private) NSLayoutConstraint

尽管遍历了 inputAccessoryView.constraints 数组中的每个约束，但我无法访问。我尝试了两种方法:

 var constraints:[NSLayoutConstraint] = tableView.inputAccessoryView!.constraints() as Array
        for  (c: NSLayoutConstraint) in constraints{
            if c.identifier == "_UIKBAutolayoutHeightConstraint"{
                println("height")
            }
        }



var constraints:[NSLayoutConstraint] = tableView.inputAccessoryView!.constraints() as Array
        for  (c: NSLayoutConstraint) in constraints{
            if c.firstAttribute == NSLayoutAttribute.Height{
                println("height constraint found")
            }
        }

Answer 1

我解决了。在设置默认约束之前，我在 ViewDidLoad 中搜索它。