使用分段控件在表视图之间切换

Question

我有一个显示多个任务的tableView，我想以编程方式在两个数据源之间切换。我已经创建了一个出现在顶部的分段控件，但当我点击按钮时，没有任何变化，我不知道如何将我的分段控件链接到我的数据源，这是我的代码：

class MyTasksCollectionCell: UICollectionViewCell, UITableViewDelegate, UITableViewDataSource {

var tasks = [Add]()
var pastTasks = [Add]()

static let identifier = "MyTasksCollectionCell"
private let cellID = "CellID"

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.tasks.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

let cell = tableView.dequeueReusableCell(withIdentifier: cellID, for: indexPath) as! MyTasksTableCell
cell.accessoryType = .disclosureIndicator

cell.categoryLabel.text =
"(tasks[indexPath.row].category)"
cell.dateLabel.text =
"(tasks[indexPath.row].date)"
cell.hourLabel.text =
"(tasks[indexPath.row].hour)"

if cell.categoryLabel.text == "Urgent" {
cell.categoryIcon.image = #imageLiteral(resourceName: "red.png")
}
if cell.categoryLabel.text == "Important" {
cell.categoryIcon.image = #imageLiteral(resourceName: "orange.png")
}
if cell.categoryLabel.text == "Not Important" {
cell.categoryIcon.image = #imageLiteral(resourceName: "green.png")
}
cell.dateIcon.image = UIImage(systemName: "calendar.badge.clock")
return cell

}

func addControl() {
let segmentItems = ["Present Tasks", "Past Tasks"]
let control = UISegmentedControl(items: segmentItems)
control.frame = CGRect(x: 10, y: 0, width: (self.tableView.frame.width - 20), height: 30)
control.addTarget(self, action: #selector(segmentControl(_:)), for: .valueChanged)
control.selectedSegmentIndex = 0
tableView.addSubview(control)
}
@objc func segmentControl(_ segmentedControl: UISegmentedControl) {
switch (segmentedControl.selectedSegmentIndex) {
case 0:
// First segment tapped
print("Present Tasks")
self.tableView.reloadData()
break
case 1:
// Second segment tapped
print("Past Tasks")
self.tableView.reloadData()
break
default:
break
}
}
}

Answer 1

使用枚举来知道根据段控制值在选项卡中显示什么：

enum DispkayedTasks {
case current
case past
}
var displayedTask = DisplayedTasks.current
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int         {
switch (displayedTask) {
case .current:
// First segment tapped
return self.tasks.count
case .past:
// Second segment tapped
return self.pastTasks.count
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: cellID, for: indexPath) as! MyTasksTableCell
cell.accessoryType = .disclosureIndicator
let task = {() -> Add in
switch (displayedTask) {
case .current:
// First segment tapped
return self.tasks[indexPath.row]
case past:
// Second segment tapped
return self.pastTasks[indexPath.row]
}
}()

cell.categoryLabel.text =
"(task.category)"
cell.dateLabel.text =
"(task.date)"
cell.hourLabel.text =
"(task.hour)"

if cell.categoryLabel.text == "Urgent" {
cell.categoryIcon.image = #imageLiteral(resourceName: "red.png")
}
if cell.categoryLabel.text == "Important" {
cell.categoryIcon.image = #imageLiteral(resourceName: "orange.png")
}
if cell.categoryLabel.text == "Not Important" {
cell.categoryIcon.image = #imageLiteral(resourceName: "green.png")
}
cell.dateIcon.image = UIImage(systemName: "calendar.badge.clock")
return cell

}
@objc func segmentControl(_ segmentedControl: UISegmentedControl) {
switch (segmentedControl.selectedSegmentIndex) {
case 0:
// First segment tapped
print("Present Tasks")
displayedTasks = .current
self.tableView.reloadData()

case 1:
// Second segment tapped
print("Past Tasks")
displayedTasks = .past
self.tableView.reloadData()

default:
break
}
}