如何绘制单点(Swift)
如何绘制单点(Swift)
提问于 2019-10-17 13:42:24
我正在制作一款应用程序，可以在点之间绘制线条来绘制图形。第一件事是用触控来画点，但是我已经尝试了很多，但是我仍然找不到首先画点的方法。下面是我的代码：
class ViewController: UIViewController {
@IBOutlet weak var imageView: UIImageView!
var xpoint: CGFloat = 0
var ypoint: CGFloat = 0
var opacity: CGFloat = 1.0
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches {
let location = touch.location(in: self.view)
xpoint = location.x
ypoint = location.y
}
}
override func viewDidLoad() {
super.viewDidLoad()
}
}回答 1
Stack Overflow用户
回答已采纳
发布于 2019-10-17 13:45:59
现在，您只需要获取该位置并在其中添加一个视图。尝试更新touchesBegan，使其如下所示：
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches {
let location = touch.location(in: self.view)
xpoint = location.x
ypoint = location.y
//Initialize the view at the correct spot
//We set the view's frame by giving it an origin (that's the CGPoint we build from the x and y coordinates) and giving it a size, which can be anything really
let pointView = UIView(frame: CGRect(origin: CGPoint(x: xpoint, y: ypoint), size: CGSize(width: 25, height: 25))
//Round the view's corners so that it is a circle, not a square
view.layer.cornerRadius = 12.5
//Give the view a background color (in this case, blue)
view.backgroundColor = .blue
//Add the view as a subview of the current view controller's view
self.view.addSubview(view)
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/58425627
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