自定义 UIKit 中工作表及调整其大小

0:01 - Get a sheet

if let sheet = viewController.sheetPresentationController {
    // Customize the sheet
}
present(viewController, animated: true)

0:02 - Detents (large only)

if let sheet = picker.sheetPresentationController {
    sheet.detents = [.large()]
}
present(picker, animated: true)

0:03 - Detents (medium and large)

if let sheet = picker.sheetPresentationController {
    sheet.detents = [.medium(), .large()]
}
present(picker, animated: true)

0:04 - Detents (medium only)

if let sheet = picker.sheetPresentationController {
    sheet.detents = [.medium()]
}
present(picker, animated: true)

0:05 - Present image picker in a standard sheet

func showImagePicker() {
    let picker = PHPickerViewController()
    picker.delegate = self
    present(picker, animated: true)
}

func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
    // assign result to imageView.image
    dismiss(animated: true)
}

0:06 - Present at medium detent, and don’t dismiss automatically

func showImagePicker() {
    let picker = PHPickerViewController()
    picker.delegate = self
    if let sheet = picker.sheetPresentationController {
        sheet.detents = [.medium(), .large()]
    }
    present(picker, animated: true)
}

func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
    // assign result to imageView.image
}

0:07 - Prevent scrolling from expanding the sheet

func showImagePicker() {
    let picker = PHPickerViewController()
    picker.delegate = self
    if let sheet = picker.sheetPresentationController {
        sheet.detents = [.medium(), .large()]
        sheet.prefersScrollingExpandsWhenScrolledToEdge = false
    }
    present(picker, animated: true)
}

func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
    // assign result to imageView.image
}

0:08 - Select medium detent when a photo is picked

func showImagePicker() {
    let picker = PHPickerViewController()
    picker.delegate = self
    if let sheet = picker.sheetPresentationController {
        sheet.detents = [.medium(), .large()]
        sheet.prefersScrollingExpandsWhenScrolledToEdge = false
    }
    present(picker, animated: true)
}

func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
    // assign result to imageView.image
    if let sheet = picker.sheetPresentationController {
        sheet.selectedDetentIdentifier = .medium
    }
}

0:09 - Animate selection of medium detent

func showImagePicker() {
    let picker = PHPickerViewController()
    picker.delegate = self
    if let sheet = picker.sheetPresentationController {
        sheet.detents = [.medium(), .large()]
        sheet.prefersScrollingExpandsWhenScrolledToEdge = false
    }
    present(picker, animated: true)
}

func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
    // assign result to imageView.image
    if let sheet = picker.sheetPresentationController {
        sheet.animateChanges {
            sheet.selectedDetentIdentifier = .medium
        }
    }
}

0:10 - Remove dimming at medium detent

func showImagePicker() {
    let picker = PHPickerViewController()
    picker.delegate = self
    if let sheet = picker.sheetPresentationController {
        sheet.detents = [.medium(), .large()]
        sheet.prefersScrollingExpandsWhenScrolledToEdge = false
        sheet.smallestUndimmedDetentIdentifier = .medium
    }
    present(picker, animated: true)
}

func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
    // assign result to imageView.image
    if let sheet = picker.sheetPresentationController {
        sheet.animateChanges {
            sheet.selectedDetentIdentifier = .medium
        }
    }
}

0:11 - iPhone in landscape

if let sheet = fontPicker.sheetPresentationController {
    sheet.prefersEdgeAttachedInCompactHeight = true
    sheet.widthFollowsPreferredContentSizeWhenEdgeAttached = true
}
present(fontPicker, animated: true)

0:12 - Show a grabber

if let sheet = fontPicker.sheetPresentationController {
    sheet.prefersGrabberVisible = true
}
present(fontPicker, animated: true)

0:13 - Customize the corner radius

if let sheet = fontPicker.sheetPresentationController {
    sheet.preferredCornerRadius = 20.0
}
present(fontPicker, animated: true)

0:14 - Adapt a popover to a customized sheet

func showImagePicker(_ sender: UIBarButtonItem) {
    let picker = PHPickerViewController()
    picker.delegate = self
    picker.modalPresentationStyle = .popover
    if let popover = picker.popoverPresentationController {
        popover.barButtonItem = sender

        let sheet = popover.adaptiveSheetPresentationController
        sheet.detents = [.medium(), .large()]
        sheet.prefersScrollingExpandsWhenScrolledToEdge = false
        sheet.smallestUndimmedDetentIdentifier = .medium
    }
    present(picker, animated: true)
}

0:15 - Be consistent when using adaptiveSheetPresentationController

func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
    // assign result to imageView.image
    if let sheet = picker.popoverPresentationController?.adaptiveSheetPresentationController {
        sheet.animateChanges {
            sheet.selectedDetentIdentifier = .medium
        }
    }
}