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[英]Adding UILongPressGestureRecognizer to UIButton inside custom UITableViewCell
[英]UIButton inside custom UITableViewCell causes button to be selected in multiple cells
UITableView的目標是在名稱旁邊顯示一個自定義樣式的復選框。 但是以某種方式,當我點擊復選框時,UITableView中的多個復選框被選中。
我已經用Google搜索並實施了來自不同問題的多種解決方案,但似乎沒有一個可行。
自定義UITableViewCell
import UIKit
class NameTableViewCell: UITableViewCell {
var name = UILabel()
let checkboxImage_unchecked = UIImage(named: "cellViewCheckbox_unchecked")
let checkboxImage_checked = UIImage(named: "cellViewCheckbox_checked")
let checkbox:UIButton
weak var delegate:HandleCellInteractionDelegate?
override init(style: UITableViewCellStyle, reuseIdentifier: String!) {
self.checkbox = UIButton(frame: CGRectMake(35, 16, self.checkboxImage_unchecked!.size.width/2, self.checkboxImage_unchecked!.size.height/2))
super.init(style: style, reuseIdentifier: reuseIdentifier)
self.backgroundColor = UIColor.transparant()
self.checkbox.setBackgroundImage(self.checkboxImage_unchecked, forState: .Normal)
self.checkbox.setBackgroundImage(self.checkboxImage_checked, forState: .Selected)
self.name = UILabel(frame: CGRectMake(97,18,200, 30))
self.addSubview(self.name)
self.addSubview(self.checkbox)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
func checkboxPushed(sender:AnyObject){
self.checkbox.selected = !self.checkbox.selected
self.delegate?.didPressButton(self)
}
在該協議中,我聲明了didPressButton方法作為按下按鈕時的回調(委托需要實現它)
協議
import UIKit
protocol HandleCellInteractionDelegate:class {
func didPressButton(cell:NameTableViewCell)
}
ViewController
import UIKit
class NameViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, HandleCellInteractionDelegate{
var nameView:NameView {
get {
return self.view as! NameView
}
}
var names:[Name]?
var firstLetters:[String]?
let cellIdentifier = "nameCell"
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
//self.view.backgroundColor = UIColor.darkSalmon()
}
override func loadView() {
let bounds = UIScreen.mainScreen().bounds
self.view = NameView(frame: bounds)
if(NSUserDefaults.standardUserDefaults().objectForKey("gender") !== nil){
self.loadJSON()
self.getFirstLetters();
self.nameView.tableView.delegate = self;
self.nameView.tableView.dataSource = self;
self.nameView.tableView.registerClass(NameTableViewCell.classForCoder(), forCellReuseIdentifier: "nameCell")
self.nameView.tableView.separatorStyle = .None
self.nameView.tableView.rowHeight = 66.5 }
}
func loadJSON(){
let path = NSBundle.mainBundle().URLForResource("names", withExtension: "json")
let jsonData = NSData(contentsOfURL: path!)
self.names = NamesFactory.createFromJSONData(jsonData!, gender: NSUserDefaults.standardUserDefaults().integerForKey("gender"))
}
func getFirstLetters(){
var previous:String = ""
for name in self.names! {
let firstLetter = String(name.name.characters.prefix(1))
if firstLetter != previous {
previous = firstLetter
self.firstLetters?.append(firstLetter)
print(firstLetter)
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return (self.names!.count)
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
return nameCellAtIndexPath(indexPath)
}
func nameCellAtIndexPath(indexPath:NSIndexPath) -> NameTableViewCell {
let cell = self.nameView.tableView.dequeueReusableCellWithIdentifier(cellIdentifier) as! NameTableViewCell
self.setNameForCell(cell, indexPath: indexPath)
cell.delegate = self;
cell.checkbox.addTarget(cell, action: "checkboxPushed:", forControlEvents: .TouchUpInside)
return cell
}
func setNameForCell(cell:NameTableViewCell, indexPath:NSIndexPath) {
let item = self.names![indexPath.row] as Name
cell.name.text = item.name
}
func didPressButton(cell: NameTableViewCell) {
print(cell)
}
}
我在做什么錯,我該如何解決?
您必須保存復選框狀態。 在您的模型(名稱)中再添加一個屬性checkboxStatus,希望您擁有indexpath.row。 在nameCellAtIndexPath中的此行之后
cell.delegate = self;
像這樣設置標簽
cell.tag = indexPath.row;
在委托方法中,
func didPressButton(cell: NameTableViewCell) {
print(cell)
let item = self.names![cell.tag] as Name
item.checkboxstatus = cell.checkbox.selected
}
只是一項重要的改變,
func nameCellAtIndexPath(indexPath:NSIndexPath) -> NameTableViewCell {
let cell = self.tableView.dequeueReusableCellWithIdentifier(cellIdentifier) as! NameTableViewCell
self.setNameForCell(cell, indexPath: indexPath)
cell.delegate = self;
cell.tag = indexPath.row;
cell.checkbox.addTarget(cell, action: "checkboxPushed:", forControlEvents: .TouchUpInside)
let item = self.names![cell.tag] as Name
cell.checkbox.selected = item.checkboxstatus
return cell
}
干杯!
發生這種情況是因為UITableViewCell被重用了。
當您按下復選框時,您更改了單元格,因此需要在數據源模型中對其進行跟蹤。
在cellForRowAtIndexPath
您必須添加條件以檢查該復選框是否已選中。 然后,您將顯示相應的視圖。
編輯:在您的示例中,您需要檢入nameCellAtIndexPath
是否選中了該復選框,然后正確顯示它。
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