Created
June 16, 2017 14:50
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穴あきビュー
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| import UIKit | |
| class HoleView: UIView { | |
| override func awakeFromNib() { | |
| super.awakeFromNib() | |
| } | |
| override func draw(_ rect: CGRect) { | |
| super.draw(rect) | |
| guard let context = UIGraphicsGetCurrentContext() else { return } | |
| // 穴の外側を塗りつぶす | |
| UIColor.black.withAlphaComponent(0.5).setFill() | |
| context.fill(rect) | |
| // 穴はブレンドモードで .clear を指定して塗りつぶす | |
| let holeRect = rect.insetBy(dx: rect.width * 0.25, dy: (rect.height - rect.width * 0.5) * 0.5) | |
| context.setBlendMode(.clear) | |
| context.fill(holeRect) | |
| } | |
| } |
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