ios - 如何在矩形(UIButton 或 UIControl)中绘制多个水平圆圈 Swift iOS

Question

如何在矩形中用主色和环色在水平区域绘制大约三个圆。我需要用这个圆圈创建自定义按钮，像这样:

有什么好的方法吗？

Answer 1

我们可以使用 UIStackView 非常轻松地设计此类 View 。拿一个stackView，设置它的alignment为center，axis为horizo​​ntal和distribution 填充。创建一个 UILabel/UIButton/UIImageView 甚至 UIView 并为其添加圆角半径和边框。最后，将这些 View 添加到主 stackView。试试这个。

override func viewDidLoad() {
    super.viewDidLoad()

    //Setup stackView
    let myStackView = UIStackView()
    myStackView.axis = .horizontal
    myStackView.alignment = .center
    myStackView.distribution = .fillEqually
    myStackView.spacing = 8
    view.addSubview(myStackView)

    //Setup circles
    let circle_1 = circleLabel()
    let circle_2 = circleLabel()
    let circle_3 = circleLabel()

    myStackView.addArrangedSubview(circle_1)
    myStackView.addArrangedSubview(circle_2)
    myStackView.addArrangedSubview(circle_3)

    myStackView.translatesAutoresizingMaskIntoConstraints = false
    myStackView.centerXAnchor.constraint(equalTo: view.centerXAnchor, constant: 0.0).isActive = true
    myStackView.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: 0.0).isActive = true
}

func circleLabel() -> UILabel {

    let label = UILabel()
    label.backgroundColor = UIColor.red
    label.layer.cornerRadius = 12.5
    label.layer.masksToBounds = true
    label.layer.borderColor = UIColor.orange.cgColor
    label.layer.borderWidth = 3.0

    label.widthAnchor.constraint(equalToConstant: 25.0).isActive = true
    label.heightAnchor.constraint(equalToConstant: 25.0).isActive = true

    return label
}