Ios 集合视图内容未显示在视图中
我不知道为什么会发生这种情况,我有一个完全相同的集合视图的不同Xcode项目,只是为了测试和制作它,我已经完成了制作,并且在该项目中工作得非常好。然后我将所有代码和项目移到我的主Xcode项目中,当我播放应用程序时,集合视图就不会显示在我的视图控制器中 如何调试集合视图?这两个:Ios 集合视图内容未显示在视图中,ios,swift,xcode,uicollectionview,swift5,Ios,Swift,Xcode,Uicollectionview,Swift5,我不知道为什么会发生这种情况,我有一个完全相同的集合视图的不同Xcode项目,只是为了测试和制作它,我已经完成了制作,并且在该项目中工作得非常好。然后我将所有代码和项目移到我的主Xcode项目中,当我播放应用程序时,集合视图就不会显示在我的视图控制器中 如何调试集合视图?这两个:playerCollect?.cellForItem(at:path)和playerCollect.indexPathForItem(at:p)如果这是一个问题,它们都返回nil?我不知道。当我把它转移到我的主要项目时,
playerCollect?.cellForItem(at:path)
和playerCollect.indexPathForItem(at:p)
如果这是一个问题,它们都返回nil?我不知道。当我把它转移到我的主要项目时,我可能还没有把所有的东西都连接起来,但是你怎么会发现呢?以下是包含UICollectionView的viewController的完整代码:
import UIKit
import AVKit
import Firebase
import MMPlayerView
class HomeViewController: UIViewController {
var offsetObservation: NSKeyValueObservation?
lazy var mmPlayerLayer: MMPlayerLayer = {
let l = MMPlayerLayer()
l.cacheType = .memory(count: 5)
l.coverFitType = .fitToPlayerView
l.videoGravity = AVLayerVideoGravity.resizeAspect
l.replace(cover: CoverA.instantiateFromNib())
l.repeatWhenEnd = true
return l
}()
@IBOutlet weak var playerCollect: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
// remove previous download fails file
MMPlayerDownloader.cleanTmpFile()
self.navigationController?.mmPlayerTransition.push.pass(setting: { (_) in
})
offsetObservation = playerCollect.observe(\.contentOffset, options: [.new]) { [weak self] (_, value) in
guard let self = self, self.presentedViewController == nil else {return}
NSObject.cancelPreviousPerformRequests(withTarget: self)
self.perform(#selector(self.startLoading), with: nil, afterDelay: 0.2)
}
playerCollect.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: 200, right:0)
DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) { [weak self] in
self?.updateByContentOffset()
self?.startLoading()
}
mmPlayerLayer.getStatusBlock { [weak self] (status) in
switch status {
case .failed(let err):
let alert = UIAlertController(title: "err", message: err.description, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
self?.present(alert, animated: true, completion: nil)
case .ready:
print("Ready to Play")
case .playing:
print("Playing")
case .pause:
print("Pause")
case .end:
print("End")
default: break
}
}
mmPlayerLayer.getOrientationChange { (status) in
print("Player OrientationChange \(status)")
}
}
deinit {
offsetObservation?.invalidate()
offsetObservation = nil
print("ViewController deinit")
}
@IBAction func profileButtonTap(_ sender: Any) {
let uid = (Auth.auth().currentUser?.uid)!
let Splash = SpalshScreenViewController()
Splash.GetProfilePicture(uid: uid)
Splash.GetUsername(uid: uid)
Splash.GetName(uid: uid)
Splash.GetClipsNumber(uid: uid)
Splash.GetFollowersNumber(uid: uid)
Splash.GetFollowingsNumber(uid: uid)
performSegue(withIdentifier: "showProfile", sender: nil)
}
}
extension HomeViewController: MMPlayerFromProtocol {
func backReplaceSuperView(original: UIView?) -> UIView? {
guard let path = self.findCurrentPath(),
let cell = self.findCurrentCell(path: path) as? PlayerCell else {
return original
}
return cell.imgView
}
// add layer to temp view and pass to another controller
var passPlayer: MMPlayerLayer {
return self.mmPlayerLayer
}
func transitionWillStart() {
}
// show cell.image
func transitionCompleted() {
self.updateByContentOffset()
self.startLoading()
}
}
extension HomeViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let m = min(UIScreen.main.bounds.size.width, UIScreen.main.bounds.size.height)
return CGSize(width: m, height: m*0.75)
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
DispatchQueue.main.async { [unowned self] in
if self.presentedViewController != nil || self.mmPlayerLayer.isShrink == true {
//self.playerCollect.scrollToItem(at: indexPath, at: .centeredVertically, animated: true)
//self.updateDetail(at: indexPath)
} else {
self.presentDetail(at: indexPath)
}
}
}
fileprivate func updateByContentOffset() {
if mmPlayerLayer.isShrink {
return
}
if let path = findCurrentPath(),
self.presentedViewController == nil {
self.updateCell(at: path)
//Demo SubTitle
if path.row == 0, self.mmPlayerLayer.subtitleSetting.subtitleType == nil {
let subtitleStr = Bundle.main.path(forResource: "srtDemo", ofType: "srt")!
if let str = try? String.init(contentsOfFile: subtitleStr) {
self.mmPlayerLayer.subtitleSetting.subtitleType = .srt(info: str)
self.mmPlayerLayer.subtitleSetting.defaultTextColor = .red
self.mmPlayerLayer.subtitleSetting.defaultFont = UIFont.boldSystemFont(ofSize: 20)
}
}
}
}
fileprivate func presentDetail(at indexPath: IndexPath) {
self.updateCell(at: indexPath)
mmPlayerLayer.resume()
if let vc = UIStoryboard.init(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "DetailViewController") as? DetailViewController {
vc.data = DemoSource.shared.demoData[indexPath.row]
self.present(vc, animated: true, completion: nil)
}
}
fileprivate func updateCell(at indexPath: IndexPath) {
if let cell = playerCollect.cellForItem(at: indexPath) as? PlayerCell, let playURL = cell.data?.play_Url {
// this thumb use when transition start and your video dosent start
mmPlayerLayer.thumbImageView.image = cell.imgView.image
// set video where to play
mmPlayerLayer.playView = cell.imgView
mmPlayerLayer.set(url: playURL)
}
}
@objc fileprivate func startLoading() {
self.updateByContentOffset()
if self.presentedViewController != nil {
return
}
// start loading video
mmPlayerLayer.resume()
}
private func findCurrentPath() -> IndexPath? {
let p = CGPoint(x: playerCollect.contentOffset.x + playerCollect.frame.width/2, y: playerCollect.frame.height/2)
print(playerCollect.indexPathForItem(at: p))
return playerCollect.indexPathForItem(at: p)
}
private func findCurrentCell(path: IndexPath) -> UICollectionViewCell? {
print(playerCollect?.cellForItem(at: path))
return playerCollect?.cellForItem(at: path)
}
}
extension HomeViewController: UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return DemoSource.shared.demoData.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "PlayerCell", for: indexPath) as? PlayerCell {
cell.data = DemoSource.shared.demoData[indexPath.row]
return cell
}
return UICollectionViewCell()
}
}
是否在此视图控制器上指定了集合视图的委托和数据源
self.playerCollect.delegate = self
self.playerCollect.dataSource = self
并加上:
self.playerCollect.reloadData()
更新你的代码如下
class HomeViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
self.playerCollect.delegate = self
self.playerCollect.dataSource = self
}
}
extension HomeViewController: UICollectionViewDataSource, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return DemoSource.shared.demoData.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "PlayerCell", for: indexPath) as? PlayerCell {
cell.data = DemoSource.shared.demoData[indexPath.row]
return cell
}
return UICollectionViewCell()
}
}
检查您的
UICollectionView
委托和数据源?你从故事板连接了吗?@HardikS我该怎么做?我可以从swift文件连接吗?我该怎么做?我可以从swift文件连接吗?在ViewDidLoad:playerCollect.dataSource=self和playerCollect.delegate=self和playerCollect.reloadData()上,你的类应该是:class HomeViewController:UIViewController,UICollectionViewDelegate,UICollectionViewDataSource这是一件奇怪的事情,我不需要在我以前的项目中设置它们两个,我猜这只是一个简单的连接?我不需要在我的类中这样做,因为我有扩展来做