第二个UICollectionView未重新加载
第二个UICollectionView未重新加载
提问于 2018-06-01 12:44:56
我正在尝试在同一个UIViewController中实现两个UICollectionView。然而，这是错误的，当我运行应用程序时，只有一个UICollectionView显示，另一个则保持空白。我尝试了很多方法来解决这个问题，但我总是以失败告终。
import UIKit
class ViewController: UIViewController, UICollectionViewDataSource {
@IBOutlet var collectionView: UICollectionView!
@IBOutlet weak var collectionViewBanner: UICollectionView!
var dataSource: [Content] = [Content]()
var dataBanner: [Banner] = [Banner]()
override func viewDidLoad() {
super.viewDidLoad()
getBanner { (data) in
DispatchQueue.main.async {
self.dataBanner = data
self.collectionViewBanner.reloadData()
}
}
getAudiobooksAPI { (data) in
DispatchQueue.main.async {
self.dataSource = data
self.collectionView.reloadData()
}
}
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if self.collectionView.tag == 1 {
return self.dataSource.count
} else {
return self.dataBanner.count
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if (collectionView == self.collectionView) {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectionViewCell", for: indexPath) as! CollectionViewCell
let content = self.dataSource[indexPath.item]
cell.bookLabel.text = content.descricao
cell.bookImage.setImage(url: content.urlImagem, placeholder: "")
return cell
} else if (collectionView == self.collectionViewBanner) {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectionViewCellBanner", for: indexPath) as! CollectionViewCell
let content = self.dataBanner[indexPath.item]
cell.bannerImage.setImage(url: content.urlImagem, placeholder: "")
return cell
}
return UICollectionViewCell()
}
}
extension UIImageView {
func setImage(url : String, placeholder: String, callback : (() -> Void)? = nil){
self.image = UIImage(named: "no-photo")
URLSession.shared.dataTask(with: NSURL(string: url)! as URL, completionHandler: { (data, response, error) -> Void in
guard error == nil else {
return
}
DispatchQueue.main.async(execute: { () -> Void in
let image = UIImage(data: data!)
self.image = image
if let callback = callback{
callback()
}
})
}).resume()
}
}另一个UICollectionView应该出现在此one的上方。我哪里做错了？
应用程序运行图像
编辑，，，我正在调试代码，我在这些行上放了一个断点。所以，发生的事情是编译器只是读取"if"，而不是进入"else“。
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if self.collectionView.tag == 1 {
return self.dataSource.count
} else {
return self.dataBanner.count
}
}回答 3
Stack Overflow用户
回答已采纳
发布于 2018-06-01 12:57:33
getBanner { (data) in
DispatchQueue.main.async {
self.dataBanner = data
self.collectionViewBanner.reloadData()
}
}
getAudiobooksAPI { (data) in
DispatchQueue.main.async {
self.dataSource = data
self.collectionView.reloadData()
}
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if (collectionView == self.collectionView) {
return self.dataSource.count
}else if (collectionView == self.collectionViewBanner) {
return self.dataBanner.count
} else {
return nil
}
}Stack Overflow用户
发布于 2018-06-01 13:05:13
请使用我的代码，它将解决您的问题
第一个变化
collectionViewBanner.reloadData中的第一个更改
第二个变化
只需检查NumberofiteminSection方法
import UIKit
class ViewController: UIViewController, UICollectionViewDataSource {
@IBOutlet var collectionView: UICollectionView!
@IBOutlet weak var collectionViewBanner: UICollectionView!
var dataSource: [Content] = [Content]()
var dataBanner: [Banner] = [Banner]()
override func viewDidLoad() {
super.viewDidLoad()
getBanner { (data) in
DispatchQueue.main.async {
self.dataBanner = data
self.collectionViewBanner.reloadData()
}
}
getAudiobooksAPI { (data) in
DispatchQueue.main.async {
self.dataSource = data
self.collectionView.reloadData()
}
}
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if (collectionView == self.collectionView) {
return self.dataSource.count
}else{
return self.dataBanner.count
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if (collectionView == self.collectionView) {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectionViewCell", for: indexPath) as! CollectionViewCell
let content = self.dataSource[indexPath.item]
cell.bookLabel.text = content.descricao
cell.bookImage.setImage(url: content.urlImagem, placeholder: "")
return cell
}else if (collectionView == self.collectionViewBanner) {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectionViewCellBanner", for: indexPath) as! CollectionViewCell
let content = self.dataBanner[indexPath.item]
cell.bannerImage.setImage(url: content.urlImagem, placeholder: "")
return cell
}
return UICollectionViewCell()
}
}
extension UIImageView{
func setImage(url : String, placeholder: String, callback : (() -> Void)? = nil){
self.image = UIImage(named: "no-photo")
URLSession.shared.dataTask(with: NSURL(string: url)! as URL, completionHandler: { (data, response, error) -> Void in
guard error == nil else{
return
}
DispatchQueue.main.async(execute: { () -> Void in
let image = UIImage(data: data!)
self.image = image
if let callback = callback{
callback()
}
})
}).resume()
}
}Stack Overflow用户
发布于 2018-06-01 12:54:01
您忘记了重新加载collectionViewBanner.只是
collectionViewBanner.reloadData()页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50636230
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