Question

我试过了：

import Cocoa

class ViewController: NSViewController {

@IBOutlet weak var butt: NSButton!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
}

override var representedObject: AnyObject? {
    didSet {
    // Update the view, if already loaded.
    }
}
@IBAction func buttPressed(sender: AnyObject) {
    let myPath = NSBezierPath()
    myPath.moveToPoint(CGPoint(x: 20, y: 20))
    myPath.lineToPoint(CGPoint(x: 100, y: 100))
    myPath.stroke()
}

}

它会编译并运行，但在单击按钮时不会绘制任何内容。我尝试设置颜色：NSColor.redColor().set()，设置宽度：myPath.lineWidth = 20并使用NSPoint代替CGPoint，但仍然会发生同样的事情。我错过了什么？提前感谢您的回答，并对基本问题表示抱歉。

Answer 1

尝试在drawRect（NSView）内完成：

import Cocoa

final class Line: NSView {
    override func drawRect(dirtyRect: NSRect) {
        let myPath = NSBezierPath()
        myPath.moveToPoint(CGPoint(x: 20, y: 20))
        myPath.lineToPoint(CGPoint(x: 100, y: 100))
        myPath.stroke()
    }
}

final class ViewController: NSViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        let frame = CGRect(x: 0, y: 0, width: 100, height: 100)
        let line = Line(frame: frame)
        view.addSubview(line)
    }

    override var representedObject: AnyObject? {
        didSet {
            // Update the view, if already loaded.
        }
    }

}

我怎样画一条简单的线？（OS X）

1 个答案: