简单的滑动关闭，支持自动布局和动态高度
小组主讲人
向视图控制器添加滑动-关闭逻辑，支持自动布局和动态高度。
Installation
Add this package to your project by searching .https://github.com/PimCoumans/PanelPresenter
To make use of the behavior that provides, make sure your view controller conforms to and set the presenter‘s property to in your initializer. Doing this at a later stage will result in weird stuff.PanelPresenterPanelPresentableviewControllerself
class SimpleViewController: UIViewController, PanelPresentable {
let panelPresenter = PanelPresenter()
init() {
super.init(nibName: nil, bundle: nil)
panelPresenter.viewController = self
}
}
Just add your views to your , which will be added to ‘s scroll view. And any navigation-type views can be placed in the which will be displayed above your content and will stick to the top of the screen when scrolling.viewpanelPresenterheaderContentView
private lazy var simpleView: UIView = {
let view = UIView()
view.backgroundColor = .systemMint
return view
}()
private lazy var cancelButton: UIButton = {
let button = UIButton(type: .system)
button.setTitle("Cancel", for: .normal)
button.addAction(UIAction { [unowned self] _ in
self.presentingViewController?.dismiss(animated: true)
}, for: .touchUpInside)
return button
}()
override func viewDidLoad() {
super.viewDidLoad()
view.tintColor = .black
view.addSubview(simpleView)
topContentView.addSubview(cancelButton)
simpleView.translatesAutoresizingMaskIntoConstraints = false
cancelButton.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
simpleView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
simpleView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
simpleView.topAnchor.constraint(equalTo: view.topAnchor),
simpleView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
simpleView.heightAnchor.constraint(equalToConstant: 200),
cancelButton.leadingAnchor.constraint(equalTo: topContentView.layoutMarginsGuide.leadingAnchor),
cancelButton.centerYAnchor.constraint(equalTo: topContentView.layoutMarginsGuide.centerYAnchor)
])
}
Example code
Check the sample app in the repository to see multiple supported scenarios for presenting your view as a panel, the simplest being comparable to the example shown above.
A more complex example is where a bunch of random, multiline labels are dynamically added to a . The height animates whenever the a label is added or removed. In the method an example is shown how to animate the height change by wrapping in an animation closure.StackViewControllerUIStackViewanimateChanges()panelPresenter.layoutIfNeeded()
Questions?
Look me up on twitter! ✌🏻
