问候stackoverflow。
我正在尝试使用彩色的子视图和圆角构建“靶心”类型的视图。问题是,只有我的第一个子视图的角被圆角化了,而内部视图仍然是正方形。黑色视图是自定义视图的子视图。红色视图是黑色视图的子视图,黄色视图是红色视图的子视图。非常简单的层级结构。
结果看起来像这样:
我手动添加视图并设置它们的约束。我的测试应用程序中,ThreeCircleView 死中心在视图控制器中,X,Y居中,宽度和高度固定。我在 didLayoutSubViews 中实际进行角的圆角处理,因为视图的大小可能会改变,因此必须重新调整角的大小。
我编写了一个测试视图来隔离此问题,以下是该视图:
class ThreeCircleView: UIView {
var outerCircle: UIView = UIView()
var middleCircle: UIView = UIView()
var innerCircle: UIView = UIView()
override init(frame: CGRect) {
super.init(frame: frame)
translatesAutoresizingMaskIntoConstraints = false
addSubViews()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
translatesAutoresizingMaskIntoConstraints = false
addSubViews()
}
func addSubViews() {
outerCircle.backgroundColor = .black
middleCircle.backgroundColor = .red
innerCircle.backgroundColor = .yellow
self.addSubview(outerCircle)
outerCircle.addSubview(middleCircle)
middleCircle.addSubview(innerCircle)
let outerCenterY = outerCircle.centerYAnchor.constraint(equalTo: self.centerYAnchor)
let outerCenterX = outerCircle.centerXAnchor.constraint(equalTo: self.centerXAnchor)
let outerCenterWidth = outerCircle.widthAnchor.constraint(equalTo: self.widthAnchor, constant: -50.0 )
let outerCenterHeight = outerCircle.heightAnchor.constraint(equalTo: self.heightAnchor, constant: -50.0 )
outerCircle.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([outerCenterY,outerCenterX,outerCenterWidth,outerCenterHeight])
self.setNeedsLayout()
let middleCenterY = middleCircle.centerYAnchor.constraint(equalTo: self.centerYAnchor)
let middleCenterX = middleCircle.centerXAnchor.constraint(equalTo: self.centerXAnchor)
let middleCenterWidth = middleCircle.widthAnchor.constraint(equalTo: self.widthAnchor, constant: -100.0 )
let middleCenterHeight = middleCircle.heightAnchor.constraint(equalTo: self.heightAnchor, constant: -100.0 )
middleCircle.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([middleCenterY,middleCenterX,middleCenterWidth,middleCenterHeight])
let innerCenterY = innerCircle.centerYAnchor.constraint(equalTo: self.centerYAnchor)
let innerCenterX = innerCircle.centerXAnchor.constraint(equalTo: self.centerXAnchor)
let innerCenterWidth = innerCircle.widthAnchor.constraint(equalTo: self.widthAnchor, constant: -150.0 )
let innerCenterHeight = innerCircle.heightAnchor.constraint(equalTo: self.heightAnchor, constant: -150.0 )
innerCircle.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([innerCenterY,innerCenterX,innerCenterWidth,innerCenterHeight])
}
func makeCircle(v:UIView) {
v.layer.cornerRadius = v.frame.size.width * 0.50
v.clipsToBounds = true
}
override func layoutSubviews() {
super.layoutSubviews()
makeCircle(v: outerCircle)
makeCircle(v: middleCircle)
makeCircle(v: innerCircle)
}
}
UIBezierPath
绘制几个圆呢? - El Tomato