我在iOS9上得到这个，但在iOS10上一切正常：
断言失败 - [UICollectionView _createPreparedSupplementaryViewForElementOfKind：atIndexPath：withLayoutAttributes：applyAttributes：]， /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit/UIKit-3512.60.12/UICollectionView.m:1599
由于未捕获的异常而终止应用 'NSInternalInconsistencyException'，原因：'UICollectionView dataSource未设置为'libc ++ abi.dylib：以uncaught终止 NSException类型的异常
编辑：我的代码
//also have all dataSources in storyboard, this func just to be clear, called in viewDidLoad
func delegates() {
self.nearbyRestarauntsCollectionView.dataSource = self
self.topCollectionView.dataSource = self
self.restOfTheWeek.dataSource = self
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
switch collectionView {
case topCollectionView:
return dataForBestChoise.count
case nearbyRestarauntsCollectionView:
return dataForNearest.count
case restOfTheWeek:
return dataForTop.count
default:
return groupedSelection["\(selectionTypes[collectionView.tag])"]!.count
}
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: IndexPath) -> CGSize {
switch collectionView {
case topCollectionView:
return CGSize(width: UIScreen.main.bounds.width, height: 292)
case nearbyRestarauntsCollectionView:
return CGSize(width: 190, height: 196)
case restOfTheWeek:
return CGSize(width: UIScreen.main.bounds.width, height: 230)
default:
return CGSize(width: 150, height: 180)
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
switch collectionView {
case topCollectionView:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "topCollectionViewCell", for: indexPath) as! MainTopCollectionViewCell
if UIScreen.main.bounds.width < 375 {
cell.ratingCenterOutlet.constant = 5
} else {
cell.ratingCenterOutlet.constant = 20
}
cell.setupCell(data: dataForBestChoise[indexPath.row])
return cell
case nearbyRestarauntsCollectionView:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "nearbyRestarauntsCell", for: indexPath) as! NearbyRestarauntsCollectionViewCell
cell.setupCell(data: dataForNearest[indexPath.row])
return cell
case restOfTheWeek:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "restsOfTheWeek", for: indexPath) as! RestsOfTheWeekCollectionViewCell
cell.setupCell(data: dataForTop[indexPath.row])
if defaults.bool(forKey: "isLogged") {
if dataForTop[indexPath.row].isFavourited {
cell.isFavourited.isHidden = false
cell.isFavourited.image = UIImage(named: "isFavouritedTrue")
} else {
cell.isFavourited.isHidden = false
cell.isFavourited.image = UIImage(named: "selectionIsNotFav")
}
} else {
cell.isFavourited.isHidden = true
}
cell.isFavourited.isUserInteractionEnabled = true
let imageTap = UITapGestureRecognizer(target: self, action: #selector(self.addRestToFavourites))
imageTap.cancelsTouchesInView = true
imageTap.numberOfTapsRequired = 1
cell.isFavourited.addGestureRecognizer(imageTap)
cell.isFavourited.tag = indexPath.row
return cell
default:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "bottomSelectionCVCell", for: indexPath) as! BottomSelectionCollectionViewCell
cell.setupSelection(tag: collectionView.tag, row: indexPath.row, selection: (groupedSelection["\(selectionTypes[collectionView.tag])"]?[indexPath.row])!)
if defaults.bool(forKey: "isLogged") == true {
if cell.isFavourited == true {
cell.favImage.isHidden = false
cell.favImage.image = UIImage(named: "isFavouritedTrue")
} else {
cell.favImage.isHidden = false
cell.favImage.image = UIImage(named: "selectionIsNotFav")
}
} else {
cell.favImage.isHidden = true
}
cell.favImage.isUserInteractionEnabled = true
let imageTap = UITapGestureRecognizer(target: self, action: #selector(self.addSelectionToFavourites))
imageTap.cancelsTouchesInView = true
imageTap.numberOfTapsRequired = 1
cell.favImage.addGestureRecognizer(imageTap)
return cell
}
}
一个集合视图位于tableView：
中func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.selectionTypes.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "bottomSelectionCell", for: indexPath) as! BottomSelectionsTableViewCell
cell.selectionGroupName.text = self.selectionTypes[indexPath.row].uppercased()
cell.selectionGroupName.addCharactersSpacing(1.95, text: cell.selectionGroupName.text!)
cell.setCollectionViewDataSourceDelegate(self, forRow: indexPath.row)
return cell
}
func setCollectionViewDataSourceDelegate <D: UICollectionViewDataSource & UICollectionViewDelegate> (_ dataSourceDelegate: D, forRow row: Int) {
collectionView.delegate = dataSourceDelegate
collectionView.dataSource = dataSourceDelegate
collectionView.tag = row
collectionView.reloadData()
}
EDIT2：
我重建了整个UIViewController（删除旧的并创建了新的），但仍然收到此错误。
答案 0 :(得分：1)
Ooookay，所以我有方法
func setupCell() {
self.layoutIfNeeded()
if self.gradientView.layer.sublayers == nil {
self.gradientView.drawGradient(colors: [whiteColor.cgColor, colorWithAlpha(whiteColor, alpha: 0.5).cgColor], locations: [0, 1])
}
self.mapView.isMyLocationEnabled = false
self.mapView.settings.myLocationButton = false
self.locationManager.delegate = self
self.nearyLabel.addCharactersSpacing(1.94, text: "Рядом")
if CLLocationManager.authorizationStatus() == .authorizedAlways || CLLocationManager.authorizationStatus() == .authorizedWhenInUse {
self.locationManager.startUpdatingLocation()
} else {
let coordinateCenter = CLLocationCoordinate2DMake(37.606384, 55.765191)
self.mapView.camera = GMSCameraPosition(target: coordinateCenter, zoom: 14, bearing: 0, viewingAngle: 0)
}
}
问题是self.layoutIfNeeded()，我删除了这一行，一切都很好。我不知道发生了什么，导致iOS10，正如我所说，很好。