64 lines
2.0 KiB
Swift
64 lines
2.0 KiB
Swift
// Ref: https://www.rightpoint.com/rplabs/fixing-controls-and-scrolling-button-views-ios
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import UIKit
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// These let you start a touch on a control that's inside a scroll view,
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// and then if you start dragging, it cancels the touch on the button
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// and lets you scroll instead. Without these scroll view subclasses,
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// controls in scroll views will eat touches that start in them, which
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// prevents scrolling and makes the app feel broken.
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//
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// The UITextInput exception is for cases where you have a text field
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// or a text view in a scroll view. If you press and hold there, you want
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// to get the text editing magnifier cursor, instead of canceling the
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// touch in the text input element.
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//
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// Ditto for UISlider and UISwitch: if the table view eats the drag gesture,
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// they feel broken. Feel free to add your own exceptions if you have custom
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// controls that require swiping or dragging to function.
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public final class ControlContainableScrollView: UIScrollView {
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public override func touchesShouldCancel(in view: UIView) -> Bool {
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if view is UIControl
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&& !(view is UITextInput)
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&& !(view is UISlider)
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&& !(view is UISwitch) {
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return true
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}
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return super.touchesShouldCancel(in: view)
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}
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}
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public final class ControlContainableTableView: UITableView {
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public override func touchesShouldCancel(in view: UIView) -> Bool {
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if view is UIControl
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&& !(view is UITextInput)
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&& !(view is UISlider)
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&& !(view is UISwitch) {
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return true
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}
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return super.touchesShouldCancel(in: view)
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}
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}
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public final class ControlContainableCollectionView: UICollectionView {
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public override func touchesShouldCancel(in view: UIView) -> Bool {
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if view is UIControl
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&& !(view is UITextInput)
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&& !(view is UISlider)
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&& !(view is UISwitch) {
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return true
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}
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return super.touchesShouldCancel(in: view)
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}
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}
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