要求：我需要使用JSON过滤UITableView中的UISearchBar数据，因此我放置UISearchBar（不是UISearchBarController ）在我的视图控制器顶部，我将UITableView放在UISearchBar下方，我还有api密钥，其中包含json格式的数据。
我的视图控制器中的代码：
class FourthViewController: UIViewController,UITableViewDelegate,UITableViewDataSource,UISearchBarDelegate,UITabBarControllerDelegate,UISearchDisplayDelegate{
var arrDict = NSMutableArray()
var FilteredData = NSMutableArray()
var userid:String!
@IBOutlet var SearchButton: UISearchBar!
@IBOutlet var SlideShow: ImageSlideshow!
@IBOutlet var MyTableView: UITableView!
@IBOutlet var PostButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
self.navigationController?.navigationBar.hidden = true
SearchButton.delegate = self
jsonParsingFromURL()
SlideShow.backgroundColor = UIColor.whiteColor()
SlideShow.slideshowInterval = 5.0
SlideShow.pageControlPosition = PageControlPosition.UnderScrollView
SlideShow.pageControl.currentPageIndicatorTintColor = UIColor.lightGrayColor()
SlideShow.pageControl.pageIndicatorTintColor = UIColor.blackColor()
SlideShow.contentScaleMode = UIViewContentMode.ScaleAspectFill
SlideShow.setImageInputs(alamofireSource)
}
func jsonParsingFromURL () {
if Reachability.isConnectedToNetwork() == true
{
Alamofire.request(.GET, "http://something.com", parameters: nil, encoding: .URL, headers: nil).response { (req, res, data, error) -> Void in
let dataString = NSString(data: data!, encoding:NSUTF8StringEncoding)
print(dataString)
self.startParsing(data!)
}
}
else{
let alert = UIAlertController(title: "No Internet Connection", message: "make sure your device is connected to the internet", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
}
}
func startParsing(data :NSData)
{
let dict: NSDictionary!=(try! NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers)) as! NSDictionary
for i in 0 ..< (dict.valueForKey("ads") as! NSArray).count
{
arrDict.addObject((dict.valueForKey("ads") as! NSArray) .objectAtIndex(i))
}
MyTableView.reloadData()
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return arrDict.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("FirstCell") as! FirstTableViewCell
let strTitle : NSString=arrDict[indexPath.row] .valueForKey("categoryname") as! NSString
let photoImage : NSString=arrDict[indexPath.row] .valueForKey("image1") as! NSString
let SecondImage : NSString=arrDict[indexPath.row] .valueForKey("image2") as! NSString
let ThirdImage : NSString=arrDict[indexPath.row] .valueForKey("image3") as! NSString
let FourthImage : NSString=arrDict[indexPath.row] .valueForKey("image4") as! NSString
let URL_API_HOST2:String = "https://www.imagestring.com/"
// let FourthData = NSData(contentsOfURL: NSURL(string: URL_API_HOST2 + (FourthImage as String))!)
cell.image1.sd_setImageWithURL(NSURL(string: URL_API_HOST2 + (photoImage as String)))
cell.image2.sd_setImageWithURL(NSURL(string: URL_API_HOST2 + (SecondImage as String)))
// cell.image2.image = UIImage(data: SecData!)
cell.image3.sd_setImageWithURL(NSURL(string: URL_API_HOST2 + (ThirdImage as String)))
cell.image4.sd_setImageWithURL(NSURL(string: URL_API_HOST2 + (FourthImage as String)))
cell.CategoryName.text = strTitle as String
return cell
}
问题：我已经加载了一个被称为类别的api密钥。现在我需要使用搜索栏获取子类别数据..子类别还有另一个api ....
答案 0 :(得分：2)
Apple声明： UISearchController对象根据与搜索栏的互动来管理搜索结果的显示。 description here
如果你使用UISearchBar
import UIKit
class TDSearchVC: UIViewController ,UITableViewDataSource,UITableViewDelegate , UISearchResultsUpdating , UISearchBarDelegate{
//MARK:- Outlets
//MARK:-
@IBOutlet var tblSearch: UITableView!
//MARK:- Properties
//MARK:-
var dataArray = [String]()
var filteredArray = [String]()
var shouldShowSearchResults = false
var searchController: UISearchController!
//MARK:- VDL
//MARK:-
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
loadListOfCountries() // get the data from file
configureSearchController() // Config Controller in VC
}
//MARK:- VC Methods
//MARK:-
func loadListOfCountries() {
// Specify the path to the countries list file.
let pathToFile = Bundle.main.path(forResource: "Country", ofType: "txt")
if let path = pathToFile {
// Load the file contents as a string.
do{
let countriesString = try String(contentsOfFile: path, encoding: String.Encoding.utf8)
self.dataArray = countriesString.components(separatedBy: "\n")
}
catch{
print("try-catch error is catched!!")
}
tblSearch.reloadData()
}
}
func configureSearchController() {
searchController = UISearchController(searchResultsController: nil)
searchController.dimsBackgroundDuringPresentation = false
searchController.searchBar.placeholder = "Search here..."
searchController.searchBar.delegate = self
searchController.searchResultsUpdater = self
searchController.searchBar.sizeToFit()
self.tblSearch.tableHeaderView = searchController.searchBar
}
//MARK:- table datasource
//MARK:-
public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
if shouldShowSearchResults {
return filteredArray.count
}
else {
return dataArray.count
}
}
public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as UITableViewCell
if shouldShowSearchResults {
cell.textLabel?.text = filteredArray[indexPath.row]
}
else {
cell.textLabel?.text = dataArray[indexPath.row]
}
return cell
}
//MARK:- search update delegate
//MARK:-
public func updateSearchResults(for searchController: UISearchController){
let searchString = searchController.searchBar.text
// Filter the data array and get only those countries that match the search text.
filteredArray = dataArray.filter({ (country) -> Bool in
let countryText: NSString = country as NSString
return (countryText.range(of: searchString!, options: .caseInsensitive).location) != NSNotFound
})
tblSearch.reloadData()
}
//MARK:- search bar delegate
//MARK:-
public func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
shouldShowSearchResults = true
tblSearch.reloadData()
}
public func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
shouldShowSearchResults = false
tblSearch.reloadData()
}
}
如果你使用UITextField
import UIKit
class TDSearchVC: UIViewController , UITableViewDataSource, UITableViewDelegate, UITextFieldDelegate{
@IBOutlet var textSearch: UITextField!
@IBOutlet var tblSearchResult: UITableView!
var arrData : [String] = []
var arrFilterData : [String] = []
var isSearch : Bool!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
isSearch = false
/*
* If date Data is in Json then use JSON Serialization
*/
arrData = ["Apple", "Banana", "Chikoo", "Brew", "Cherry", "Mango", "Lotus", "Peacock", "Temple", "Pine Apple","Glass", "Rose", "Church", "Computer", "Carrot"]
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK:- textfield
public func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool{
var searchText = textField.text! + string
if string == "" {
searchText = (searchText as String).substring(to: searchText.index(before: searchText.endIndex))
}
if searchText == "" {
isSearch = false
tblSearchResult.reloadData()
}
else{
getSearchArrayContains(searchText)
}
return true
}
// Predicate to filter data
func getSearchArrayContains(_ text : String) {
var predicate : NSPredicate = NSPredicate(format: "SELF CONTAINS[c] %@", text)
arrFilterData = (arrData as NSArray).filtered(using: predicate) as! [String]
isSearch = true
tblSearchResult.reloadData()
}
// MARK:- TableView Delegates
public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
if isSearch! {
return arrFilterData.count
}
else{
return arrData.count
}
}
public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
var cell : UITableViewCell = tableView.dequeueReusableCell(withIdentifier: "cell")! as UITableViewCell
if isSearch! {
cell.textLabel?.text = arrFilterData[indexPath.row]
}
else{
cell.textLabel?.text = arrData[indexPath.row]
}
return cell
}
}