我想实现一个可调整大小和可拖动的 UIView，如下图所示：
这是我到目前为止使用简单的手势识别器实现的类：
class PincherView: UIView {
var pinchRec:UIPinchGestureRecognizer!
var rotateRec:UIRotationGestureRecognizer!
var panRec:UIPanGestureRecognizer!
var containerView:UIView!
init(size: CGRect, container:UIView) {
super.init(frame: size)
self.containerView = container
self.pinchRec = UIPinchGestureRecognizer(target: self, action: "handlePinch:")
self.addGestureRecognizer(self.pinchRec)
self.rotateRec = UIRotationGestureRecognizer(target: self, action: "handleRotate:")
self.addGestureRecognizer(self.rotateRec)
self.panRec = UIPanGestureRecognizer(target: self, action: "handlePan:")
self.addGestureRecognizer(self.panRec)
self.backgroundColor = UIColor(red: 0.0, green: 0.6, blue: 1.0, alpha: 0.4)
self.userInteractionEnabled = true
self.multipleTouchEnabled = true
self.hidden = false
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func handlePinch(recognizer : UIPinchGestureRecognizer) {
if let view = recognizer.view {
view.transform = CGAffineTransformScale(view.transform, 1.0, recognizer.scale)
//view.transform = CGAffineTransformScale(view.transform, recognizer.scale, recognizer.scale)
recognizer.scale = 1
}
}
func handleRotate(recognizer : UIRotationGestureRecognizer) {
if let view = recognizer.view {
view.transform = CGAffineTransformRotate(view.transform, recognizer.rotation)
recognizer.rotation = 0
}
}
func handlePan(recognizer:UIPanGestureRecognizer) {
let translation = recognizer.translationInView(containerView)
if let view = recognizer.view {
view.center = CGPoint(x:view.center.x + translation.x,
y:view.center.y + translation.y)
}
recognizer.setTranslation(CGPointZero, inView: containerView)
}
}
正如您可以想象的那样，使用简单UIPinchGestureRecognizer的 uiview 在 x 和 y 方向上均等地缩放，但我希望用户有机会尽可能精确，以便他们甚至可以在一个方向上缩放或改变形式uiview，不一定是矩形。此外，对我来说更重要的是用户在设置uiview的高度时尽可能精确这就是为什么我需要在角落有这 4 个按钮的原因。我只是想让你给我一些提示，从哪里开始以及如何开始。谢谢
更新 这是我已经知道的
通过这种方式，我有以下层次结构：
-UIImageView嵌入 -UIView嵌入 -UIScrollView嵌入 -UIViewController
我必须添加一个进一步UIView用作容器，以便它包含的所有子 uiview 将与图片一起放大/缩小，以便具有更高的精度，以便更好地将 azure uiview 重叠到拍摄对象。关于引脚，白色的小圆圈，这是我尝试实现的类：
class PinImageView: UIImageView {
var lastLocation:CGPoint!
var container:UIView!
var viewToScale:UIView!
var id:String!
init(imageIcon: UIImage?, location:CGPoint, container:UIView, viewToScale:UIView, id:String) {
super.init(image: imageIcon)
self.lastLocation = location
self.frame = CGRect(x: location.x, y: location.y, width: 10.0, height: 10.0)
self.center = location
self.userInteractionEnabled = true
self.container = container
self.viewToScale = viewToScale
self.id = id
self.hidden = false
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func getScaleParameters(arrivalPoint:CGPoint) -> (sx:CGFloat, sy:CGFloat) {
//var result:(sx:CGFloat, sy:CGFloat) = (1.0, 1.0)
var scaleX:CGFloat = 1.0
var scaleY:CGFloat = 1.0
switch (self.id) {
case "up_left":
/* up_left is moving towards right*/
if (self.lastLocation.x < arrivalPoint.x) {
scaleX = -0.99
}
/* up_left is moving towards left*/
else {
scaleX = 0.9
}
/* up_left is moving towards up*/
if (self.lastLocation.y < arrivalPoint.y) {
scaleY = -0.9
}
/* up_left is moving towards down*/
else {
scaleY = 0.9
}
break
default:
scaleX = 1.0
scaleY = 1.0
}
return (scaleX, scaleY)
}
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
if let touch: UITouch = touches.first {
let scaleParameters:(sx:CGFloat, sy:CGFloat) = self.getScaleParameters(touch.locationInView(self.container))
self.viewToScale.transform = CGAffineTransformMakeScale(scaleParameters.sx, scaleParameters.sy)
//self.center = touch.locationInView(self.container)
self.center = touch.locationInView(self.container)
self.lastLocation = touch.locationInView(self.container)
}
}
}
蔚蓝的浮动uiview在哪里viewToScale调用pincherViewRec。开头的引脚中心在pincherViewRec.frame.origin. 说它没有按预期工作是没有用的。你有什么主意吗？任何提示将不胜感激，以帮助我找到正确的方法。