我是否必须创建自定义类才能在Swift游乐场中使用BezierPath?
以下代码仅显示黑色背景:
import UIKit
import XCPlayground
class GraphView : UIView {
override func drawRect(rect: CGRect) {
let path = UIBezierPath(rect: rect)
path.moveToPoint(CGPointMake(0,0))
path.addLineToPoint(CGPointMake(50,100))
path.closePath()
UIColor.redColor().setFill()
path.stroke()
}
}
let graphView = GraphView(frame: CGRectMake(0,0,960,640))
答案 0 :(得分:5)
您必须在代码末尾使用此功能:
ArrayList
并打开游乐场"助理编辑"看到结果。
还可以更改视图的背景颜色,因为它是黑色的...而且你的线也是黑色的。 ;)
答案 1 :(得分:1)
在Swift 5中:
import UIKit
class GraphView : UIView {
override init(frame: CGRect) {
super.init(frame: frame)
backgroundColor = .white
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func draw(_ rect: CGRect) {
let path = UIBezierPath(rect: rect)
path.move(to: CGPoint(x: 0, y: 0))
path.addLine(to: CGPoint(x: 50, y: 100))
path.stroke()
}
}
let graphView = GraphView(frame: CGRect(x: 0, y: 0, width: 960, height: 640))