我希望有人可以帮助我解决这个问题。以下是我的tvOS应用截图:
(来源:mtiaz.com)。
我正在尝试做两件事:
当用户在其遥控器上向下滚动时,collectionView中的第二项将自动变为焦点。我需要有它,以便使第一项成为重点。
当用户在collectionView中的项目之间手动移动焦点时,我希望屏幕中间部分的UI元素得到更新,而不必分别按下或选择它们。
到目前为止,此屏幕是我的代码:
import UIKit
// Global variable
internal let g_CR1 = "channel_cell_01"
class DashboardVC: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {
// outlets
@IBOutlet weak var collectionView: UICollectionView!
@IBOutlet weak var lblChannelName: UILabel!
@IBOutlet weak var imgChannelLogo: UIImageView!
@IBOutlet weak var txtChannelDescription: UITextView!
// variables
var staticData: [Channel] = []
override func viewDidLoad() {
super.viewDidLoad()
// sample channels
initializeSampleData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
// MARK: - CollectionView Callbacks
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return staticData.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
// Get or make a cell
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: g_CR1, for: indexPath) as! CollectionViewCell
// Configure
cell.imgView.backgroundColor = UIColor.black
cell.imgView.image = staticData[indexPath.row].chLogo
// Return.
return cell
}
func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
return true
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let currentChannel = staticData[indexPath.row]
DispatchQueue.main.async {
self.lblChannelName.text = currentChannel.chName
self.imgChannelLogo.image = currentChannel.chLogo
self.txtChannelDescription.text = currentChannel.chDescription
}
}
}
我能够回答第二点。希望有人可以从中受益。但是我仍然被#1踩住。
func collectionView(_ collectionView: UICollectionView, didUpdateFocusIn context: UICollectionViewFocusUpdateContext, with coordinator: UIFocusAnimationCoordinator) {
// test
print("Previous Focused Path: \(context.previouslyFocusedIndexPath)")
print("Next Focused Path: \(context.nextFocusedIndexPath)")
let currentChannel = staticData[(context.nextFocusedIndexPath?[1])!]
DispatchQueue.main.async {
self.lblChannelName.text = currentChannel.chName
self.imgChannelLogo.image = currentChannel.chLogo
self.txtChannelDescription.text = currentChannel.chDescription
}
}