我以迅速滚动视图的形式列出了一个列表,其中视图由标签,按钮等各种类型组成。
但是,当我将按钮添加到子视图时,尽管显示了所有其他标签,但它们并未显示。我还尝试过约束和锚点。 另一方面,当我将相同的按钮添加到self.view.addsubview而不是scrollview.addsubview时,它们只是不滚动而显示,因为不再是滚动视图的一部分。 我什至删除了标签,以确保按钮没有重叠(也不起作用)
我还尝试查看“代码调试层次结构”(3D模式)中的代码,即使添加了按钮,我也看不到那里的按钮
下面是我的代码,其中包含标签,滚动视图和按钮的示例。如果有人可以提供任何见解,那就太好了。
.......滚动视图...................................... < / strong>
var editInfoView : UIScrollView = {
let view = UIScrollView()
view.translatesAutoresizingMaskIntoConstraints = false
view.contentSize.height = 700
view.backgroundColor = tableBackGroundColor
view.frame = CGRect(x: 0, y: 220, width: 375, height: 400)
return view
}()
.......................标签...................... < / strong>
vehicleNumberLabel.translatesAutoresizingMaskIntoConstraints = false
vehicleNumberLabel.textColor = .white
vehicleNumberLabel.text = "Vehicle Number"
vehicleNumberLabel.textAlignment = .left
editInfoView.addSubview(vehicleNumberLabel)
vehicleNumberLabel.leftAnchor.constraint(equalTo: editInfoView.leftAnchor).isActive = true
vehicleNumberLabel.topAnchor.constraint(equalTo: editInfoView.topAnchor, constant: 100).isActive = true
vehicleNumberLabel.widthAnchor.constraint(equalToConstant: 160).isActive = true
vehicleNumberLabel.heightAnchor.constraint(equalToConstant: 20).isActive = true
......................按钮...................... ..........
vehicleNumberButton.translatesAutoresizingMaskIntoConstraints = false
vehicleNumberButton.setTitleColor(tableTextColor, for: .normal)
vehicleNumberButton.setTitle("Vehicle Number", for: .normal)
vehicleNumberButton.tintColor = tableTextColor
vehicleNumberButton.backgroundColor = tableTextColor
editInfoView.addSubview(vehicleNumberButton)
vehicleNumberButton.rightAnchor.constraint(equalTo: editInfoView.rightAnchor).isActive = true
vehicleNumberButton.topAnchor.constraint(equalTo: editInfoView.topAnchor, constant: 400).isActive = true
vehicleNumberButton.widthAnchor.constraint(equalToConstant: 600).isActive = true
vehicleNumberButton.heightAnchor.constraint(equalToConstant: 255).isActive = true
答案 0 :(得分:1)
尽管我无法通过代码和解释来确定问题的根本原因,但我怀疑在 db.Organizations.aggregate([
{
$match: {
oldOrgID: "176348"
}
},
{
$lookup: {
from: "Groups",
localField: "orgID",
foreignField: "otherIds.orgID",
as: "group-section"
}
},
{
$project: {
"group-section._id": 0,
"group-section.groupID": 0,
"group-section.otherIds": 0,
"group-section.version": 0
}
}
])
上向 {
"_id" : ObjectId("5c11efebd9cb4d35f47d6bd0"),
"orgID" : "5b6c82462fb9ca35444d0ba2",
"name" : "The Punjab Public School",
"oldOrgID" : "176348",
"group-section" : [ ]
}
添加子视图后,您的UIScrollView()
的框架为零布局引擎的异常行为。当我们以编程方式创建约束时,我们正在创建不平等,平等和优先级的组合,以将视图限制为特定的框架。如果这些约束方程的值不正确,则会更改相关视图的显示方式。避免同时使用viewDidAppear(_:)
和CGRect.zero
是一种很好的做法,因为视图可能会根据语言(书写方向)和用户设置而改变方向。
ViewController.swift
leftAnchor