ios 自由移动缩放的矩形框
时间: 2023-07-25 22:26:29 浏览: 59
您可以考虑使用UIKit框架中的UIPanGestureRecognizer和UIPinchGestureRecognizer手势来实现自由移动和缩放矩形框。
首先,您需要创建一个UIView子类来表示矩形框,并在该视图上添加手势识别器。在手势识别器的处理函数中,您可以使用手势的位移和缩放值来更新矩形框的位置和大小。
以下是一个简单的示例:
```
class RectangleView: UIView {
private var lastLocation = CGPoint.zero
private var lastScale: CGFloat = 1.0
override init(frame: CGRect) {
super.init(frame: frame)
// 添加手势识别器
let panGesture = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
let pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(handlePinch(_:)))
self.addGestureRecognizer(panGesture)
self.addGestureRecognizer(pinchGesture)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
// 处理拖动手势
@objc private func handlePan(_ gesture: UIPanGestureRecognizer) {
let translation = gesture.translation(in: self.superview)
self.center = CGPoint(x: lastLocation.x + translation.x, y: lastLocation.y + translation.y)
if gesture.state == .ended {
lastLocation = self.center
}
}
// 处理缩放手势
@objc private func handlePinch(_ gesture: UIPinchGestureRecognizer) {
switch gesture.state {
case .began:
lastScale = gesture.scale
case .changed:
let scale = gesture.scale / lastScale
self.transform = self.transform.scaledBy(x: scale, y: scale)
lastScale = gesture.scale
default:
break
}
}
}
```
在您的视图控制器中,您可以创建一个RectangleView实例,并将其添加到父视图中:
```
let rectView = RectangleView(frame: CGRect(x: 100, y: 100, width: 100, height: 100))
self.view.addSubview(rectView)
```
这样,您就可以通过拖动和缩放手势来移动和缩放矩形框了。