ios - 使表格 View 部分 swift 展开
<p><p>我关注 <a href="http://www.appcoda.com/expandable-table-view/" rel="noreferrer noopener nofollow">this</a>扩展和折叠我的表格 View 部分的教程。由于这个演示是在 swift 2.2 中完成的，所以我已经根据 swift 3.0 进行了所有更改。我在 if condition(currentSectionCells["isVisible"]) 处被困在下面的函数中，这给了我“类型'NSFastEnumerationIterator.Element'(又名'Any'没有下标成员)'”的错误。</p>
<pre><code>func getIndicesOfVisibleRows() {
visibleRowsPerSection.removeAll()
for currentSectionCells in cellDescriptors {
var visibleRows = ()
for row in 0...((currentSectionCells as! []).count - 1) {
if currentSectionCells["isVisible"] as! Bool == true {
visibleRows.append(row)
}
}
visibleRowsPerSection.append(visibleRows)
}
}
</code></pre>
<p>我尝试过如下类型转换</p>
<pre><code> func getIndicesOfVisibleRows() {
visibleRowsPerSection.removeAll()
for currentSectionCells in cellDescriptors {
var visibleRows = ()
for row in 0...((((currentSectionCells) as? NSMutableArray)?.count)! - 1) {
let temp = as? NSMutableDictionary
let temp2 = temp?["isVisible"] as! Bool
if temp2== true {
visibleRows.append(row)
}
}
visibleRowsPerSection.append(visibleRows)
}
}
</code></pre>
<p>但这让我在运行时在“let temp2 = temp?["isVisible"] as!Bool”这一行上崩溃
崩溃显示“EXC_BAD_INSTRUCTION”并且临时显示为 nil。</p>
<p>请帮助大家。 TIA</p>
<p> TableView 委托(delegate)和数据源</p>
<pre><code>func numberOfSectionsInTableView(tableView: UITableView) -> Int {
if cellDescriptors != nil {
return cellDescriptors.count
}
else {
return 0
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return visibleRowsPerSection.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let currentCellDescriptor = getCellDescriptorForIndexPath(indexPath: indexPath as NSIndexPath)
let cell = tableView.dequeueReusableCell(withIdentifier: currentCellDescriptor["cellIdentifier"] as! String, for: indexPath) as! CustomCell
if currentCellDescriptor["cellIdentifier"] as! String == "sectionCellIdentifier" {
if let primaryTitle = currentCellDescriptor["secondaryTitle"]
{
cell.sectionTitleLabel.text = primaryTitle as? String
}
}
else if currentCellDescriptor["cellIdentifier"] as! String == "shortAnswerCell" {
cell.questionTitle.text = currentCellDescriptor["primaryTitle"] as? String
cell.questionTextView.text = currentCellDescriptor["secondaryTitle"] as? String
cell.answerTextView.text =currentCellDescriptor["answerTitle"] as? String
}
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let indexOfTappedRow = visibleRowsPerSection
let temp = cellDescriptors as? NSArray
let temp2 = temp? as? NSDictionary
let temp3 = temp2?["isExpandable"] as! Bool
if temp3 == true {
var shouldExpandAndShowSubRows = false
if temp3 == false {
// In this case the cell should expand.
shouldExpandAndShowSubRows = true
}
temp2?.setValue(shouldExpandAndShowSubRows, forKey: "isExpanded")
for i in (indexOfTappedRow + 1)...(indexOfTappedRow + (temp2?["additionalRows"] as! Int)) {
(temp! as AnyObject).setValue(shouldExpandAndShowSubRows, forKey: "isVisible")
}
}
getIndicesOfVisibleRows()
tblExpandable.reloadSections(NSIndexSet(index: indexPath.section) as IndexSet, with: UITableViewRowAnimation.fade)
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我也参与了该教程，并在 swift3 中成功完成了它。下面给出了您的解决方案，并进行了相应的修改。</p>
<pre><code> class yourClass: UIViewController
{
@IBOutlet weak var profileTableView: UITableView!
internal var visibleRowsPerSection = []()
internal var cellDescriptors: NSMutableArray!
// VIEW DID LOAD
override func viewDidLoad() {
super.viewDidLoad()
profileTableView.showsVerticalScrollIndicator = false
loadProfileControllerData()
profileTableSetUp()
// Do any additional setup after loading the view.
}
func loadProfileControllerData(){
if let path = Bundle.main.path(forResource: "CellDescriptor", ofType: "plist") {
cellDescriptors = NSMutableArray(contentsOfFile: path)
}
getIndicesOfVisibleRows()
profileTableView.reloadData()
}
// SHOW PARENT VISIBLE ROWS AND SAVE THERE ROW INDEX IN ARRAY
func getIndicesOfVisibleRows() {
visibleRowsPerSection.removeAll()
for currentSectionCells in cellDescriptors.objectEnumerator().allObjects as! [[]]{
var visibleRows = ()
for row in 0..<currentSectionCells.count {
if currentSectionCells["isVisible"] as! Bool == true {
visibleRows.append(row)
}
}
visibleRowsPerSection.append(visibleRows)
print(visibleRowsPerSection)
}
}
// GET REQUIRED OBJECT OF TYPE
func getCellDescriptorForIndexPath(indexPath: NSIndexPath) -> {
let indexOfVisibleRow = visibleRowsPerSection
let cellDescriptorss = cellDescriptors as! NSArray
let data = cellDescriptorss.object(at: indexOfVisibleRow) as!
return data
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
//----------------------
// EXTENSION TO OUR PROFILE CLASS THAT DETERMINE OUR CLASS CONFIRM 2 IMPORTANT DELEGATES
extension profileViewController : UITableViewDelegate,UITableViewDataSource{
//MARK-: TABLE VIEW DELEGATE FUNCTIONS
// RETURN NUMBER OFSECTION IN TABLE VIEW
public func numberOfSections(in tableView: UITableView) -> Int{
if cellDescriptors.count != 0{
return cellDescriptors.count
}
else{
return 0
}
}
// RETURN NUMBER OF ROWS IN EACH SECTION OF TABLE VIEWS
public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
return visibleRowsPerSection.count
}
/* Return object of UITableViewCell that contains table SECTON data and USER profile data */
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
let currentCellDescriptor = getCellDescriptorForIndexPath(indexPath: indexPath as NSIndexPath)
let menuCell = tableView.dequeueReusableCell(withIdentifier: currentCellDescriptor["cellIdentifier"] as! String, for: indexPath) as! yourCellClass
if currentCellDescriptor["cellIdentifier"] as! String == "parent"{
}
else if currentCellDescriptor["cellIdentifier"] as! String == "child"{
menuCell.backgroundColor = UIColor.clear
}
return menuCell
}
public func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
let indexOfTappedRow = visibleRowsPerSection
let cellDescriptorss = cellDescriptors as! NSArray
var data = cellDescriptorss.object(at: indexOfTappedRow) as!
if data["isExpandable"] as! Bool == true{
var shouldExpandAndShowSubRows = false
if data["isExpanded"] as! Bool == true{
shouldExpandAndShowSubRows = false
(cellDescriptorss as AnyObject).setValue(shouldExpandAndShowSubRows, forKey: "isExpanded")
}
for i in (indexOfTappedRow + 1)...(indexOfTappedRow + (data["additionalRows"] as! Int)) {
(cellDescriptorss as AnyObject).setValue(shouldExpandAndShowSubRows, forKey: "isVisible")
}
}
getIndicesOfVisibleRows()
self.profileTableView.reloadSections(NSIndexSet(index: indexPath.section) as IndexSet, with: UITableViewRowAnimation.fade)
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - 使表格 View 部分 swift 展开，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/43818004/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/43818004/
</a>
</p>
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