Sudut hitam aneh saat menggunakan fungsi draw (_ rect :)
Jika saya meletakkan kode untuk fungsi UIBezierPath
di dalam saya , draw(_ rect:)
saya mendapatkan sudut hitam sangat tipis yang aneh di sekitar tampilan dan ekor. Saat menyeret tampilan (misalnya, dalam pengontrol tampilan yang disajikan) garis tipis ini juga mulai berkedip. Saya menganggap itu bug rendering yang aneh. Adakah yang tahu jika ada cara untuk memperbaikinya?

class RenderingView: UIView {
lazy var backgroundView: UIView = {
let view = UIView()
view.layer.cornerRadius = 8
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
private lazy var shadowView: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
private lazy var textLabel: UILabel = {
let label = UILabel()
label.numberOfLines = 0
label.textAlignment = .center
label.translatesAutoresizingMaskIntoConstraints = false
label.text = "Rendering Bug"
return label
}()
override init(frame: CGRect) {
super.init(frame: frame)
setup()
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
private func setup() {
backgroundColor = .clear
backgroundView.backgroundColor = .yellow
layer.borderWidth = 0
setupLayout()
}
private func setupLayout() {
[shadowView, backgroundView, textLabel].forEach(addSubview)
backgroundView.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
backgroundView.topAnchor.constraint(equalTo: topAnchor).isActive = true
backgroundView.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true
backgroundView.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
shadowView.leadingAnchor.constraint(equalTo: backgroundView.leadingAnchor).isActive = true
shadowView.topAnchor.constraint(equalTo: backgroundView.topAnchor).isActive = true
shadowView.trailingAnchor.constraint(equalTo: backgroundView.trailingAnchor).isActive = true
shadowView.bottomAnchor.constraint(equalTo: backgroundView.bottomAnchor).isActive = true
textLabel.leadingAnchor.constraint(equalTo: backgroundView.leadingAnchor, constant: 10).isActive = true
textLabel.trailingAnchor.constraint(equalTo: backgroundView.trailingAnchor, constant: -10).isActive = true
textLabel.topAnchor.constraint(equalTo: backgroundView.topAnchor, constant: 10).isActive = true
textLabel.bottomAnchor.constraint(equalTo: backgroundView.bottomAnchor, constant: -10).isActive = true
}
override func draw(_ rect: CGRect) {
shapeBackground()
}
private func shapeBackground() {
let tailLayer = CAShapeLayer()
let bezierPath = UIBezierPath(roundedRect: CGRect(x: backgroundView.bounds.minX,
y: backgroundView.bounds.minY,
width: backgroundView.bounds.width,
height: backgroundView.bounds.height - 12),
cornerRadius: 8)
let shadowBezierPath = UIBezierPath(roundedRect: CGRect(x: backgroundView.bounds.minX + 5,
y: backgroundView.bounds.minY + 10,
width: backgroundView.bounds.width - 10,
height: backgroundView.bounds.height - 12 - 10),
cornerRadius: 8)
[bezierPath, shadowBezierPath].forEach {
$0.move(to: CGPoint(x: backgroundView.bounds.midX - 12, y: backgroundView.bounds.maxY - 12)) $0.addLine(to: CGPoint(x: backgroundView.bounds.midX, y: backgroundView.bounds.maxY))
$0.addLine(to: CGPoint(x: backgroundView.bounds.midX + 12, y: backgroundView.bounds.maxY - 12)) $0.fill()
$0.close()
}
tailLayer.path = bezierPath.cgPath
tailLayer.fillColor = UIColor.white.cgColor
shadowView.layer.shadowPath = shadowBezierPath.cgPath
shadowView.layer.cornerRadius = 8
backgroundView.layer.masksToBounds = true
backgroundView.layer.mask = tailLayer
}
}
EDIT: Ternyata saya harus menggunakan addClip()
jalur bezier untuk menyingkirkan sudut ini
Jawaban
Tidak yakin apakah ini yang Anda tuju, tetapi terlihat sempurna saat Anda shapeBackground()
mengeluarkan metode draw(_ rect:)
dan melakukan sedikit modifikasi.
Saya memodifikasi beberapa rutinitas gambar Anda di dalam shapeBackground()
, dan memindahkan fungsinya ke dalam layoutSubviews()
menghitung posisi ekor dari bingkai yang dibuat oleh batasan. Saya juga menambahkan beberapa variabel untuk tailWidth
, & tailHeight
.
Seperti:
class RenderingView: UIView {
lazy var backgroundView: UIView = {
let view = UIView()
view.layer.cornerRadius = 8
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
private lazy var shadowView: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
private lazy var textLabel: UILabel = {
let label = UILabel()
label.numberOfLines = 0
label.textAlignment = .center
label.translatesAutoresizingMaskIntoConstraints = false
label.text = "No Rendering Bug"
return label
}()
override init(frame: CGRect) {
super.init(frame: frame)
setup()
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
private func setup() {
backgroundColor = .clear
backgroundView.backgroundColor = .systemTeal
//backgroundView.frame.size = CGSize(width: 100, height: 100)
layer.borderWidth = 0
setupLayout()
}
private func setupLayout() {
[shadowView, backgroundView, textLabel].forEach(addSubview)
backgroundView.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
backgroundView.topAnchor.constraint(equalTo: topAnchor).isActive = true
backgroundView.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true
backgroundView.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
shadowView.leadingAnchor.constraint(equalTo: backgroundView.leadingAnchor).isActive = true
shadowView.topAnchor.constraint(equalTo: backgroundView.topAnchor).isActive = true
shadowView.trailingAnchor.constraint(equalTo: backgroundView.trailingAnchor).isActive = true
shadowView.bottomAnchor.constraint(equalTo: backgroundView.bottomAnchor).isActive = true
textLabel.leadingAnchor.constraint(equalTo: backgroundView.leadingAnchor, constant: 10).isActive = true
textLabel.trailingAnchor.constraint(equalTo: backgroundView.trailingAnchor, constant: -10).isActive = true
textLabel.topAnchor.constraint(equalTo: backgroundView.topAnchor, constant: 10).isActive = true
textLabel.bottomAnchor.constraint(equalTo: backgroundView.bottomAnchor, constant: -10).isActive = true
}
override func didMoveToWindow() {
super.didMoveToWindow()
}
override func layoutSubviews() {
super.layoutSubviews()
shapeBackground(color: UIColor.systemTeal)
}
override func draw(_ rect: CGRect) {
super.draw(rect)
}
private func shapeBackground(color: UIColor) {
let tailLayer = CAShapeLayer()
tailLayer.name = "tailLayer"
let tailWidth: CGFloat = 16
let tailHeight: CGFloat = 10
let bezierPath = UIBezierPath()
let shadowBezierPath = UIBezierPath()
[bezierPath, shadowBezierPath].forEach {
$0.move(to: CGPoint(x: 0, y: 0)) $0.addLine(to: CGPoint(x: tailWidth / 2, y: tailHeight))
$0.addLine(to: CGPoint(x: tailWidth, y: 0)) $0.fill()
$0.close()
}
tailLayer.path = bezierPath.cgPath
tailLayer.fillColor = color.cgColor
shadowView.layer.shadowPath = shadowBezierPath.cgPath
shadowView.layer.cornerRadius = 8
print(backgroundView.bounds.width)
tailLayer.frame = CGRect(x: (backgroundView.bounds.width - tailWidth) / 2,
y: backgroundView.bounds.maxY,
width: tailWidth,
height: tailHeight)
backgroundView.layer.masksToBounds = false
backgroundView.layer.addSublayer(tailLayer)
}
}