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improve anchor point handling during transforms, add example
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| // | ||
| // AnchorPointViewController.swift | ||
| // Kinetic_Example | ||
| // | ||
| // Created by Nicholas Shipes on 2/3/19. | ||
| // Copyright © 2019 CocoaPods. All rights reserved. | ||
| // | ||
|
|
||
| import UIKit | ||
| import Kinetic | ||
|
|
||
| class AnchorPointViewController: ExampleViewController { | ||
| var square: UIView! | ||
| var squareContainer: UIView! | ||
|
|
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| fileprivate let pickerView = UIPickerView() | ||
| fileprivate var pickerData: [String] = [] | ||
| fileprivate var tween: Tween? | ||
|
|
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| override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) { | ||
| super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil) | ||
|
|
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| title = "Anchor Point" | ||
| pickerData = [ | ||
| "Top-Left", | ||
| "Top", | ||
| "Top-Right", | ||
| "Left", | ||
| "Center", | ||
| "Right", | ||
| "Bottom-Left", | ||
| "Bottom", | ||
| "Bottom-Right" | ||
| ] | ||
| } | ||
|
|
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| required init?(coder aDecoder: NSCoder) { | ||
| fatalError("init(coder:) has not been implemented") | ||
| } | ||
|
|
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| override func viewDidLoad() { | ||
| super.viewDidLoad() | ||
|
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| pickerView.translatesAutoresizingMaskIntoConstraints = false | ||
| pickerView.dataSource = self | ||
| pickerView.delegate = self | ||
| view.addSubview(pickerView) | ||
|
|
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| square = UIView() | ||
| square.translatesAutoresizingMaskIntoConstraints = false | ||
| square.backgroundColor = .red | ||
|
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| /** | ||
| * `TransformContainerView` is a UIView subclass in Kinetic to be used when adjusting a view's anchorPoint. | ||
| * | ||
| * Need to place our animated view within a transparent container view since we will be adjusting the view's anchorPoint | ||
| * and applying a transform, which will prevent it from shifting the view's actual position within the view and allows | ||
| * us to still use AutoLayout for positioning the view | ||
| * re: https://stackoverflow.com/a/14105757 | ||
| */ | ||
| squareContainer = TransformContainerView(view: square) | ||
| view.addSubview(squareContainer) | ||
|
|
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| /* | ||
| * Since we're placing the animated square within a container view, we set position constraints on the container view | ||
| * and then width and height constraints on the actual square view, which will also size the container automatically | ||
| */ | ||
| NSLayoutConstraint.activate([squareContainer.topAnchor.constraint(equalTo: view.topAnchor, constant: 100), | ||
| squareContainer.centerXAnchor.constraint(equalTo: view.centerXAnchor), | ||
| square.widthAnchor.constraint(equalToConstant: 100), | ||
| square.heightAnchor.constraint(equalToConstant: 100), | ||
| pickerView.topAnchor.constraint(equalTo: squareContainer.bottomAnchor, constant: 100), | ||
| pickerView.leftAnchor.constraint(equalTo: view.leftAnchor), | ||
| pickerView.rightAnchor.constraint(equalTo: view.rightAnchor), | ||
| pickerView.heightAnchor.constraint(equalToConstant: 250)]) | ||
|
|
||
| let tween = square.tween().to(Rotation(Float.pi * 2)).duration(1.0).ease(Cubic.easeInOut) | ||
| animation = tween | ||
| self.tween = tween | ||
|
|
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| pickerView.selectRow(4, inComponent: 0, animated: false) | ||
| } | ||
| } | ||
|
|
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| extension AnchorPointViewController: UIPickerViewDelegate, UIPickerViewDataSource { | ||
|
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| func numberOfComponents(in pickerView: UIPickerView) -> Int { | ||
| return 1 | ||
| } | ||
|
|
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| func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { | ||
| return pickerData.count | ||
| } | ||
|
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| func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? { | ||
| return pickerData[row] | ||
| } | ||
|
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| func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) { | ||
| var anchor = AnchorPoint.center | ||
|
|
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| switch row { | ||
| case 0: anchor = .topLeft | ||
| case 1: anchor = .top | ||
| case 2: anchor = .topRight | ||
| case 3: anchor = .left | ||
| case 4: anchor = .center | ||
| case 5: anchor = .right | ||
| case 6: anchor = .bottomLeft | ||
| case 7: anchor = .bottom | ||
| case 8: anchor = .bottomRight | ||
| default: anchor = .center | ||
| } | ||
|
|
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| tween?.anchor(anchor) | ||
| } | ||
| } |
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