194 lines
6.5 KiB
Markdown
194 lines
6.5 KiB
Markdown
Introspect for SwiftUI
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======================
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[![GithubCI_Status]][GithubCI_URL] [![Siteline_Badge]](https://siteline.com) [![Quintschaf_Badge]](https://quintschaf.com)
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> Introspect allows you to get the underlying UIKit or AppKit element of a SwiftUI view.
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For instance, with Introspect you can access `UITableView` to modify separators, or `UINavigationController` to customize the tab bar.
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How it works
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------------
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Introspect works by adding a custom `IntrospectionView` to the view hierarchy, then looking into the UIKit hierarchy to find the relevant view.
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For instance, when introspecting a `TextField`, it will:
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- Add `IntrospectionView` as an overlay of `TextField`
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- Get the view host of the introspection view (which is alongside the view host of the `UITextField`)
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- Get the previous sibling containing `UITextField`
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**Please note that this introspection method might break in future SwiftUI releases.** Future implementations might not use the same hierarchy, or might not use UIKit elements that are being looked for. Though the library is unlikely to crash, the `.introspect()` method will not be called in those cases.
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### Usage in production
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`Introspect` is meant to be used in production. It does not use any private API. It only inspects the view hierarchy using publicly available methods. The library takes a defensive approach to inspecting the view hierarchy: there is no hard assumption that elements are laid out a certain way, there is no force-cast to UIKit classes, and the `introspect()` methods are simply ignored if UIKit views cannot be found.
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Install
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-------
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### SwiftPM
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```
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https://github.com/siteline/SwiftUI-Introspect.git
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```
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### Cocoapods
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```
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pod 'Introspect'
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```
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Introspection
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-------------
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### Implemented
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SwiftUI | UIKit | AppKit | Introspect
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--- | --- | --- | ---
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NavigationView (StackNavigationViewStyle) | UINavigationController | _N/A_ | `.introspectNavigationController()`
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NavigationView (DoubleColumnNavigationViewStyle) | UISplitViewController | _N/A_ | `.introspectSplitViewController()`
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NavigationView (DoubleColumnNavigationViewStyle) | _N/A_ | NSSplitView | `.introspectSplitView()`
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_Any embedded view_ | UIViewController | _N/A_ | `.introspectViewController()`
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ScrollView | UIScrollView | NSScrollView | `.introspectScrollView()`
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List | UITableView | NSTableView | `.introspectTableView()`
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View in List | UITableViewCell | NSTableCellView | `introspectTableViewCell()`
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TabView | UITabBarController | NSTabView | `.introspectTabBarController()` (iOS) <br/> `.introspectTabView()` (macOS)
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TextField | UITextField | NSTextField | `.introspectTextField()`
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Toggle | UISwitch | NSButton | `.introspectSwitch()` (iOS) <br/> `.introspectButton()` (macOS)
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Slider | UISlider | NSSlider | `.introspectSlider()`
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Stepper | UIStepper | NSStepper | `.introspectStepper()`
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DatePicker | UIDatePicker | NSDatePicker | `.introspectDatePicker()`
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Picker (SegmentedPickerStyle) | UISegmentedControl | NSSegmentedControl | `.introspectSegmentedControl()`
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Button | _N/A_ | NSButton | `.introspectButton()`
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ColorPicker | UIColorWell | NSColorWell | `.introspectColorWell()`
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TextEditor | UITextView | NSTextView | `.introspectTextView()`
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**Missing an element?** Please [create an issue](https://github.com/timbersoftware/SwiftUI-Introspect/issues). As a temporary solution, you can [implement your own selector](#implement-your-own-selector).
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### Cannot implement
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SwiftUI | Affected Frameworks | Why
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--- | --- | ---
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Text | UIKit, AppKit | Not a UILabel / NSLabel
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Image | UIKit, AppKit | Not a UIImageView / NSImageView
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Button | UIKit | Not a UIButton
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Examples
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--------
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### List
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```swift
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List {
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Text("Item 1")
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Text("Item 2")
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}
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.introspectTableView { tableView in
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tableView.separatorStyle = .none
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}
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.introspectTableViewCell { cell in
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let backgroundView = UIView()
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backgroundView.backgroundColor = .clear
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cell.selectedBackgroundView = backgroundView
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}
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```
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### ScrollView
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```swift
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ScrollView {
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Text("Item 2")
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}
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.introspectScrollView { scrollView in
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scrollView.refreshControl = UIRefreshControl()
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}
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```
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### NavigationView
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```swift
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NavigationView {
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Text("Item 2")
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.introspectNavigationController { navigationController in
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navigationController.navigationBar.backgroundColor = .red
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}
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}
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```
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### TextField
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```swift
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TextField("Text Field", text: $textFieldValue)
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.introspectTextField { textField in
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textField.layer.backgroundColor = UIColor.red.cgColor
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}
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```
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Implement your own selector
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---------------------------
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**Missing an element?** Please [create an issue](https://github.com/timbersoftware/SwiftUI-Introspect/issues).
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In case Introspect doesn't support the SwiftUI element that you're looking for, you can implement your own selector. For example, to look for a `UITextField`:
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```swift
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extension View {
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public func introspectTextField(customize: @escaping (UITextField) -> ()) -> some View {
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return inject(UIKitIntrospectionView(
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selector: { introspectionView in
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guard let viewHost = Introspect.findViewHost(from: introspectionView) else {
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return nil
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}
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return Introspect.previousSibling(containing: UITextField.self, from: viewHost)
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},
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customize: customize
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))
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}
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}
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```
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You can use any of the following [methods](https://github.com/timbersoftware/SwiftUI-Introspect/blob/master/Introspect/Introspect.swift#L3-L71) to inspect the hierarchy:
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- `Introspect.findChild(ofType:in:)`
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- `Introspect.findChildUsingFrame(ofType:in:from:)`
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- `Introspect.previousSibling(containing:from:)`
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- `Introspect.nextSibling(containing:from:)`
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- `Introspect.findAncestor(ofType:from:)`
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- `Introspect.findHostingView(from:)`
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- `Introspect.findViewHost(from:)`
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Releasing
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---------
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1. Update changelog with new version
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2. Bump version in `Introspect.podspec`
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3. PR and merge changes
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4. Tag new version:
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```sh
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$ git tag -a <VERSION> -m "<MESSAGE>"
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$ git push origin --tags
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```
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5. Push to CocoaPods trunk:
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```sh
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$ bundle exec pod trunk push .
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```
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<!-- References -->
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[GithubCI_Status]: https://github.com/siteline/swiftui-introspect/actions/workflows/ci.yml/badge.svg?branch=master
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[GithubCI_URL]: https://github.com/siteline/SwiftUI-Introspect/actions/workflows/ci.yml
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[Siteline_Badge]: https://badgen.net/badge/Built%20by/Siteline/blue?icon=https://uploads-ssl.webflow.com/5f4513afbbfc64c4777fcccf/5f525b122370d681879e170e_siteline-icon.svg
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[Quintschaf_Badge]: https://badgen.net/badge/Maintained%20by/Quintschaf/cyan?icon=https://quintschaf.com/assets/logo.svg
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