我尝试对此进行调试但无济于事。
基本上,当我从第一个视图控制器切换到第二个视图控制器时,屏幕会暂时变黑。代码按照我想要的方式执行,但是屏幕变黑对我来说有点痛苦。
这是代码:
从第一页开始的segue:
func mapView(_ mapView: MGLMapView, tapOnCalloutFor annotation: MGLAnnotation) {
self.performSegue(withIdentifier: "goToSecond", sender: self)
}
第二个视图控制器:
override func viewDidLoad() {
super.viewDidLoad()
self.loadDataFromFirebase()
}
第一个功能:
func loadDataFromFirebase() {
let db = Firestore.firestore()
db.collection(restaurauntName).getDocuments { (snapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
return
} else {
for document in snapshot!.documents {
let name = document.get("Name") as! String
let description = document.get("Description") as! String
self.names.append(name)
self.descriptions.append(description)
}
self.setupImages() //safe to do this here as the firebase data is valid
self.collectionView?.reloadData()
}
}
}
该函数设置页面布局
func setupImages(){
self.pages = [
Page(imageName: self.imagesOne, headerText: names[0], bodyText: descriptions[0]),
Page(imageName: self.imagesTwo, headerText: names[1], bodyText: descriptions[1]),
Page(imageName: self.imagesThree, headerText: names[2], bodyText: descriptions[2]),
Page(imageName: self.imagesFour, headerText: names[3], bodyText: descriptions[3]),
Page(imageName: self.imagesFive, headerText: names[4], bodyText: descriptions[4]),
]
self.collectionView?.backgroundColor = .white
self.collectionView?.register(PageCell.self, forCellWithReuseIdentifier: "cellId")
self.collectionView?.isPagingEnabled = true
}
这设置了页面控件
lazy var pageControl: UIPageControl = {
let pc = UIPageControl()
pc.currentPage = 0
pc.numberOfPages = 5
pc.currentPageIndicatorTintColor = .red
pc.pageIndicatorTintColor = .gray
return pc
}()
滑动控制器扩展:
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return pages.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellId", for: indexPath) as! PageCell
let page = pages[indexPath.item]
cell.page = page
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: view.frame.width, height: view.frame.height)
}
如果我需要添加其他内容,请告诉我!欢迎任何帮助
这是该问题的 YouTube 剪辑:
https://www.youtube.com/watch?v=vQGiw3Jd9pM https://www.youtube.com/watch?v=vQGiw3Jd9pM
我发现当我注释掉 firebase 方法时,问题就消失了。