[英]Swift - Draw lines between several random CGPoints
I am trying to create a simple line graph that should display the average monthly user score. 我正在尝试创建一个简单的折线图,该折线图应显示平均每月用户得分。 So far I have created a collectionView with a white dot at the top of each cell, but now I would like to have a straight line between each dot. 到目前为止,我已经创建了一个collectionView,每个单元格的顶部都有一个白色的点,但是现在我希望每个点之间都有一条直线。 I have added a temporary array for testing purposes. 我添加了一个临时数组用于测试。
Since it will be variable server data (the last six months), the location of the dots can be different each time. 由于这将是可变的服务器数据(最近六个月),因此点的位置每次都可以不同。 What should I do to connect the first dot with the second one and the second one with the next one (until all dots are connected)? 我应该怎么做才能将第一个点与第二个点连接,将第二个点与下一个点连接(直到所有点都连接在一起)?
User profile data controller 用户个人资料数据控制器
class UserProfileData: UICollectionViewController, UICollectionViewDelegateFlowLayout {
var cellId = "cellId"
let values: [CGFloat] = [4.5, 3.2, 4.8, 5.0, 2.3, 2.9]
init() {
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = UICollectionViewScrollDirection.horizontal
super.init(collectionViewLayout: layout)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
self.collectionView?.dataSource = self
self.collectionView?.delegate = self
collectionView?.backgroundColor = Constants.MAIN_THEME_COLOR
collectionView?.isScrollEnabled = false
collectionView?.register(BarCell.self, forCellWithReuseIdentifier: cellId)
}
// MARK: UICollectionViewDataSource
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return values.count
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 50, height: view.frame.height - 20)
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! BarCell
if let max = values.max() {
let value = values[indexPath.item]
let ratio = value / max
cell.barHeightConstraint?.constant = view.frame.height * ratio
}
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 0, left: 4, bottom: 0, right: 4)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 10
}
}
My custom cell 我的自定义单元
// Create custom cell(s)
class BarCell: UICollectionViewCell {
let barView: UIView = {
let view = UIView()
view.backgroundColor = .clear
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
let barLabel: UILabel = {
let label = UILabel()
label.text = "."
label.textColor = .white
label.font = UIFont.systemFont(ofSize: 70)
label.translatesAutoresizingMaskIntoConstraints = false
return label
}()
var barHeightConstraint: NSLayoutConstraint?
override init(frame: CGRect) {
super.init(frame: frame)
addSubview(barView)
barView.addSubview(barLabel)
barHeightConstraint = barView.heightAnchor.constraint(equalToConstant: 300)
barHeightConstraint?.isActive = true
barHeightConstraint?.constant = 100
barView.leftAnchor.constraint(equalTo: leftAnchor).isActive = true
barView.rightAnchor.constraint(equalTo: rightAnchor).isActive = true
barView.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
barLabel.centerXAnchor.constraint(equalTo: barView.centerXAnchor).isActive = true
barLabel.topAnchor.constraint(equalTo: barView.topAnchor, constant: 5).isActive = true
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
A UICollectionView
has a backgroundView
property. UICollectionView
具有backgroundView
属性。 You should be able to set the backgroundView
of your UICollectionView
to a custom UIView that draws the lines between your items. 您应该能够将UICollectionView
的backgroundView
设置为自定义UIView,该UIView在项目之间绘制线条。
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