[英]How to update table view data when a CollectionView Cell is clicked ( tableview.reloadData() not working inside CollectionView's didSelectItemAt )
click on the link to see the image. 单击链接以查看图像。 I have a collection view and a table view in the same view controller. 我在同一视图控制器中有一个集合视图和一个表视图。 I want to update the data of my table view, based on the selected item in the collection view. 我想基于集合视图中的选定项目更新表视图的数据。 So every time i click any item of collection view, my table view data should update. 因此,每当我单击集合视图的任何项目时,我的表视图数据都将更新。 My code is as follows: 我的代码如下:
public func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
for superSkill in skills!{
if superSkill.name == (skills?[indexPath.row].name)! {
childSkills = superSkill.skills!
}
}
DispatchQueue.main.async{
self.childSkillTableView.reloadData()
}
}
Is there any way i can achieve it 有什么办法可以实现
First thing is to make sure your childSkillTableView.dataSource = self
and your superSkillsCollectionView.delegate = self
首先要确保您的childSkillTableView.dataSource = self
和您的superSkillsCollectionView.delegate = self
The second thing, there's no reason to use DispatchQueue.main.async({})
第二件事,没有理由使用DispatchQueue.main.async({})
The third thing, though less important, instead of a for loop, you might use something like: 第三件事,虽然不太重要,但是可以使用类似以下内容的方法来代替for循环:
childSkills = skills?.first(where { superSkill in superSkill.name == (skills?[indexPath.row].name)! }
Though you should use some if let
or guard let
statements to check for optionals instead of force unwrapping. 尽管您应该使用一些if let
或guard let
语句来检查可选内容,而不是强制展开。
extension PerformanceVC: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return skills.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "superSkillCell", for: indexPath) as! SuperSkillCell
cell.superSkillName.text = skills[indexPath.row].name
//loading image async
ImageAsyncLoader.loadImageAsync(url: (skills[indexPath.row].imageURL)!, imgView: cell.superSkillImage)
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
{
return CGSize(width: skillCollections.frame.height * 0.9, height: skillCollections.frame.height) //use height whatever you wants.
}
public func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
print((skills[indexPath.row].name)!)
for skill in skills{
if skill.name == (skills[indexPath.row].name)! {
childSkills = skill.skills!
}
}
self.subSkillTableView.reloadData()
}
}
extension PerformanceVC: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
let openViewHeight: Int = 55
if (indexPath.row == selectedRowIndex.row && isExpanded == false){
isExpanded = true
return CGFloat(openViewHeight + 36 * (childSkills[indexPath.row].skills?.count)!)
} else if (indexPath.row == selectedRowIndex.row && isExpanded == true){
isExpanded = false
return CGFloat(openViewHeight)
} else {
isExpanded = false
return CGFloat(openViewHeight)
}
}
public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return childSkills.count
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print(childSkills[indexPath.row].name)
selectedRowIndex = indexPath
tableView.beginUpdates()
//let cell = tableView.dequeueReusableCell(withIdentifier: "SubSkillTableCell", for: indexPath) as! SubSkillTableCell
let cell = tableView.cellForRow(at: indexPath) as! SubSkillTableCell
for subview in cell.grandSkillStack.subviews {
subview.removeFromSuperview()
}
var grandSkillView: GrandChildSkillItem
grandChildSkills = (childSkills[indexPath.row].skills)!
for grandchildskill in grandChildSkills {
grandSkillView = GrandChildSkillItem(frame: CGRect(x: 0, y: 0, width: 300, height: 30))
grandSkillView.grandChildSkillNameLabel.text = grandchildskill.name
grandSkillView.grandChildSkillProgress.progress = Float(grandchildskill.percentage!)
cell.grandSkillStack.addArrangedSubview(grandSkillView)
}
tableView.endUpdates()
}
public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
//tableView.separatorStyle = .none
tableView.showsVerticalScrollIndicator = false
let cell = tableView.dequeueReusableCell(withIdentifier: "SubSkillTableCell", for: indexPath) as! SubSkillTableCell
cell.subSkillName.text = childSkills[indexPath.row].name
cell.subSkillProgress.progress = Float(childSkills[indexPath.row].percentage!)
if let uPoints = childSkills[indexPath.row].userPoints {
if let tPoints = childSkills[indexPath.row].totalPoints {
if let count = childSkills[indexPath.row].skills?.count {
cell.subSkillDetail.text = "\(uPoints)" + "/" + "\(tPoints)" + "XP \u{2022} " + "\(count)" + " subskills"
}
}
}
return cell
}
}
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