Question

我正在尝试以编程方式排列编号按钮。当UIView的子类创建按钮圈时，NSLayoutConstraint锚定视图。框架围绕中心旋转但按钮旋转不一致。除了一次旋转外，文本方向相同。

  for example

我的用于排列按钮的Swift代码在an earlier effort in Objective C上有所改进。我还提供了一些有用的建议来轮换有关屏幕中心的视图，包括this one。

如果有人能告诉我如何改进我的代码，那么每个屏幕尺寸和方向的UI都是一致的，我将不胜感激。

这是 Viewcontroller

import UIKit

class ViewController: UIViewController {

var circle: CircleView?

override func viewDidLoad() {
    super.viewDidLoad()

    let circle = CircleView()
    circle.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(circle)

    let horizontalConstraint    = circle.centerXAnchor.constraint(equalTo: view.centerXAnchor)
    let verticalConstraint      = circle.centerYAnchor.constraint(equalTo: view.centerYAnchor)
    NSLayoutConstraint.activate([horizontalConstraint, verticalConstraint])
    }
}

...和UIView的子类

import UIKit

class CircleView: UIView {

// MARK: Initialization

let points: Int             = 10    // 80 25 16 10 5
let dotSize: CGFloat        = 60    // 12 35 50 60 100
let radius: CGFloat         = 48    // 72 70 64 48 45

var arcPoint                = CGFloat(M_PI * -0.5)  // clockwise from 12+ (not 3+)!

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

override init(frame: CGRect) {
    super.init(frame: frame)

    drawUberCircle()
    drawBoundaryCircles()
}

...第二个函数绘制彩色圆形背景

    func drawUberCircle() {

    // Create a CAShapeLayer

    let shapeLayer = CAShapeLayer()

    // give Bezier path layer properties
    shapeLayer.path = createBezierPath().cgPath

    shapeLayer.strokeColor      = UIColor.cyan.cgColor
    shapeLayer.fillColor        = UIColor.cyan.cgColor
    shapeLayer.lineWidth        = 1.0        
    self.layer.addSublayer(shapeLayer)
}
    func createBezierPath() -> UIBezierPath {

    let path  = UIBezierPath(arcCenter: CGPoint(x: 0, y: 0),
                                radius: radius * 2,
                            startAngle: CGFloat(M_PI * -0.5),
                              endAngle: CGFloat(M_PI * 1.5),
                             clockwise: true)
    return path
}

...当最后一个函数以圆弧绘制按钮时

    func drawBoundaryCircles() {

    for index in 1...points {
    let point: CGPoint  = makeBoundaryPoint()
    drawButton(point: point, index: index)
    }
}


func makeBoundaryPoint() -> (CGPoint) {
    arcPoint += arcAngle()
    print(arcPoint)
    let point   = CGPoint(x: 0 + (radius * 2 * cos(arcPoint)), y: 0 + (radius * 2 * sin(arcPoint)))
    return (point)
}


func arcAngle() -> CGFloat {
    return CGFloat(2.0 * M_PI) / CGFloat(points)
}


func drawButton(point: CGPoint, index: Int) {
     let myButton = UIButton(type: .custom) as UIButton
     myButton.frame              = CGRect(x: point.x - (dotSize/2), y: point.y - (dotSize/2), width: dotSize, height: dotSize)
     myButton.backgroundColor    = UIColor.white
     myButton.layer.cornerRadius = dotSize / 2
     myButton.layer.borderWidth  = 1
     myButton.layer.borderColor  = UIColor.black.cgColor
     myButton.clipsToBounds      = true
     myButton.titleLabel!.font   = UIFont(name: "HelveticaNeue-Thin", size: dotSize/2)
     myButton.setTitleColor(UIColor.red, for: .normal)
     myButton.setTitle(String(index), for: .normal)
     myButton.tag                = index;
     myButton.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
     addSubview(myButton)
}


 func buttonAction(myButton: UIButton) {
    let sender:UIButton = myButton
    print("Button \(sender.tag) was tapped")
    }
}

修改

当iPhone被颠倒时出现旋转4（上面显示），并且与接受的答案中解释的原因无关（见下文）。如果代码在实际设备而不是模拟器上运行，这将变得更加明显。

带工作按钮的解决方案

对于按钮保持在中心和的解决方案，请参阅this

Answer 1

对于iPhone，这种行为是正确的。你通常不支持颠倒旋转，因为如果用户必须接听电话会让人感到困惑;它在苹果HIG指南中。在设备方向下的常规选项卡上查看项目设置。默认情况下，禁用“倒置”。如果您想支持倒置旋转，请检查它。

如何在Swift中以编程方式旋转一组按钮？

1 个答案: