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ios - 如何使用 swift3 弯曲 UIView 的顶部?

转载 作者:搜寻专家 更新时间:2023-11-01 07:11:48 26 4
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我经历了How to curve the top of a UIView Controller in Swift

并发表看法。它附在下面。我想从我的 View 中删除该背景色。我在 Storyboard 中制作了一个 uiview 并为该 View 分配了一个自定义类。

want to remove the black color

我的自定义类是

class curvedView: UIView {

override func draw(_ rect: CGRect) {

let color = UIColor(rgb: 0x285387)
let y:CGFloat = 0
// let curveTo:CGFloat = 50

let myBezier = UIBezierPath()
myBezier.move(to: CGPoint(x: 0, y: y))

myBezier.addQuadCurve(to: CGPoint(x: rect.width, y: y), controlPoint: CGPoint(x: rect.width / 2, y: rect.height / 3))
myBezier.addLine(to: CGPoint(x: rect.width, y: rect.height))
myBezier.addLine(to: CGPoint(x: 0, y: rect.height))
myBezier.close()
let context = UIGraphicsGetCurrentContext()
context!.setLineWidth(2.0)

color.setFill()
myBezier.fill()
}}

extension UIColor {
convenience init(red: Int, green: Int, blue: Int) {
assert(red >= 0 && red <= 255, "Invalid red component")
assert(green >= 0 && green <= 255, "Invalid green component")
assert(blue >= 0 && blue <= 255, "Invalid blue component")

self.init(red: CGFloat(red) / 255.0, green: CGFloat(green) / 255.0, blue: CGFloat(blue) / 255.0, alpha: 1.0)
}

convenience init(rgb: Int) {
self.init(
red: (rgb >> 16) & 0x28,
green: (rgb >> 8) & 0x53,
blue: rgb & 0x87
)
}}

最佳答案

我们只需为该自定义 View 提供 backgroundColor。

喜欢:

class curvedView: UIView {

override func layoutSubviews() {
self.backgroundColor = .clear
}

override func draw(_ rect: CGRect) {
let color = UIColor(rgb: 0x285387)
let y:CGFloat = 0
let myBezier = UIBezierPath()
myBezier.move(to: CGPoint(x: 0, y: y))
myBezier.addQuadCurve(to: CGPoint(x: rect.width, y: y), controlPoint: CGPoint(x: rect.width / 2, y: rect.height / 3))
myBezier.addLine(to: CGPoint(x: rect.width, y: rect.height))
myBezier.addLine(to: CGPoint(x: 0, y: rect.height))
myBezier.close()
color.setFill()
myBezier.fill()
}
}

或者最好在初始化时给出:

class curvedView: UIView {

override func draw(_ rect: CGRect) {
let color = UIColor(rgb: 0x285387)
let y:CGFloat = 0
let myBezier = UIBezierPath()
myBezier.move(to: CGPoint(x: 0, y: y))
myBezier.addQuadCurve(to: CGPoint(x: rect.width, y: y), controlPoint: CGPoint(x: rect.width / 2, y: rect.height / 3))
myBezier.addLine(to: CGPoint(x: rect.width, y: rect.height))
myBezier.addLine(to: CGPoint(x: 0, y: rect.height))
myBezier.close()
color.setFill()
myBezier.fill()

}
override init(frame: CGRect) {
super.init(frame: frame)
self.backgroundColor = UIColor.clear
}

required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.backgroundColor = UIColor.clear

}
}

关于ios - 如何使用 swift3 弯曲 UIView 的顶部?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44494966/

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