ios - How do you rescue a view that attempts to break a boundary? -
i have container view serve boundary labels in project. have feature allows users change size of view or not can problematic labels adhere boundary since forced out. know type of behavior how uicollisionbehaviors designed prevent or recover "lost" labels.
i have tried turning boundaries on , off before , after changing size of container view doesn't seem help. ideally if label gets popped out recover position , center within container view. when attempt move label center goes before outside container.
any appreciated.
as can see in following example, label has rescue attempt change it's center position not work.
customlabel.swift
import uikit class customlabel: uilabel { var containerview: uiview? var animator: uidynamicanimator? var boundry: uicollisionbehavior? func containwithin(view: uiview) { containerview = view animator = uidynamicanimator(referenceview: view) isuserinteractionenabled = true backgroundcolor = .white } func isboundryenabled(_ decider: bool) { boundry?.translatesreferenceboundsintoboundary = decider } override func touchesmoved(_ touches: set<uitouch>, event: uievent?) { if let animator = self.animator { animator.removeallbehaviors() touch in touches { let location = touch.location(in: containerview) let snap = uisnapbehavior(item: self, snapto: location) snap.damping = 0.2 animator.addbehavior(snap) boundry = uicollisionbehavior(items: [self]) boundry?.translatesreferenceboundsintoboundary = true if let b = self.boundry { animator.addbehavior(b) } } } } } viewcontroller.swift
import uikit class viewcontroller: uiviewcontroller { var containerview: uiview? var labels: [customlabel] = [] override func viewdidload() { super.viewdidload() let rect = cgrect(x: 0, y: 0, width: view.bounds.width, height: view.bounds.width) containerview = uiview(frame: rect) containerview?.center = view.center containerview?.backgroundcolor = uicolor.blue if let cv = containerview { let label = customlabel(frame: cgrect(x: 0, y: 0, width: 0, height: 0)) labels.append(label) label.text = "hello world" label.sizetofit() label.containwithin(view: cv) view.addsubview(cv) cv.addsubview(label) } } @ibaction func animatecontainerportrait() { label in labels { label.isboundryenabled(false) } uiview.animate(withduration: 0.3, animations: { let rect = cgrect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.width + 150) self.containerview?.frame = rect self.containerview?.center = self.view.center }, completion: { completed in if completed { label in self.labels { label.isboundryenabled(true) } } }) } @ibaction func animatecontainersquare() { guard let container = self.containerview else { print("unable find container view") return } label in labels { label.isboundryenabled(false) } uiview.animate(withduration: 0.3, animations: { let rect = cgrect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.width) container.frame = rect container.center = self.view.center }, completion: { completed in if completed { label in self.labels { if label.frame.maxy > container.frame.height { print("attempting rescue label") label.center = container.center } label.isboundryenabled(true) } } }) } }
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