Arrays Swift 3 JSON到对象数组的速度非常慢
我正在将我的应用程序从swift 2升级到swift 3，在构建自定义对象数组时，性能会显著下降。在swift 2中，这需要几秒钟，而在swift 3中，这需要大约30秒。我使用alamofire返回swiftyJSON，返回大约3000行数据。alamofire返回速度很快，它通过这个json循环来构建定制对象数组的速度很慢。这些对象极大地简化了在构建表单元和将数据传递给新视图时编写的代码 代码： }Arrays Swift 3 JSON到对象数组的速度非常慢,arrays,json,object,swift3,swifty-json,Arrays,Json,Object,Swift3,Swifty Json,我正在将我的应用程序从swift 2升级到swift 3，在构建自定义对象数组时，性能会显著下降。在swift 2中，这需要几秒钟，而在swift 3中，这需要大约30秒。我使用alamofire返回swiftyJSON，返回大约3000行数据。alamofire返回速度很快，它通过这个json循环来构建定制对象数组的速度很慢。这些对象极大地简化了在构建表单元和将数据传递给新视图时编写的代码 代码： } }使用nil合并运算符将使您受益匪浅：self.ID=ID？？“”您确定为ID、地址等指定一
}使用
nil合并运算符将使您受益匪浅：self.ID=ID？？“”
您确定为ID、地址等指定一个空字符串有意义吗？我不确定这是否最好，因为如果我尝试访问，它可以防止应用程序崩溃。我仍在努力解决可选项和展开变量的问题。这也不会导致崩溃<代码>self.ID=ID？？“if\u id！=nil{self.ID=_ID}else{self.ID=“”}String！class Customer {
var ID: String!
var sysName: String!
var address: String!
var contactID: String!
required init(_name:String?, _id: String?, _address:String?, _contactID:String?) {
//print(json)
if _id != nil {
self.ID = _id
}else{
self.ID = ""
}
if _name != nil {
self.sysName = _name
}else{
self.sysName = ""
}
if _address != nil {
self.address = _address
}else{
self.address = "No Address on File"
}
if _contactID != nil {
self.contactID = _contactID
}else{
self.contactID = ""
}
}
Alamofire.request(API.Router.customerList()).responseJSON() {
response in
print(response.request ?? "") // original URL request
print(response.response ?? "") // URL response
print(response.data ?? "") // server data
print(response.result) // result of response serialization
if let json = response.result.value {
print("JSON: \(json)")
self.customers = JSON(json)
self.parseJSON()
}
}
func parseJSON(){
let jsonCount = self.customers["customers"].count
self.totalCustomers = jsonCount
for i in 0 ..< jsonCount {
self.loadedCustomers = i
print("customer = \(self.customers["customers"][i] ["sysName"].string!)")
//VERY SLOW
//create a customer object
let customer = Customer( _name: self.customers["customers"][i]["sysName"].string!, _id: self.customers["customers"][i]["ID"].string!, _address: self.customers["customers"][i]["mainAddr"].string!, _contactID: self.customers["customers"][i]["contactID"].string!)
//add customer to customer array
self.customersArray.append(customer)
}
self.layoutViews() //build view, call all table methods
}
var indicator: SDevIndicator!
var totalCustomers:Int!
//data arrays
var ids = [String]()
var names = [String]()
var addresses = [String]()
var searchController:UISearchController!
var currentSearchMode = SearchMode.name
var customerTableView:TableView = TableView()
var layoutVars:LayoutVars = LayoutVars()
var sections : [(index: Int, length :Int, title: String)] = Array()
var customersSearchResults:[String] = []
var shouldShowSearchResults:Bool = false
let viewsConstraint_V:NSArray = []
let viewsConstraint_V2:NSArray = []
override func viewDidLoad() {
super.viewDidLoad()
title = "Customer List"
view.backgroundColor = layoutVars.backgroundColor
getCustomerList()
}
func getCustomerList() {
//remove any added views (needed for table refresh
for view in self.view.subviews{
view.removeFromSuperview()
}
// Show Indicator
indicator = SDevIndicator.generate(self.view)!
Alamofire.request(API.Router.customerList()).responseJSON() {
response in
//print(response.request ?? "") // original URL request
//print(response.response ?? "") // URL response
//print(response.data ?? "") // server data
//print(response.result) // result of response serialization
do {
if let data = response.data,
let json = try JSONSerialization.jsonObject(with: data) as? [String: Any],
let customers = json["customers"] as? [[String: Any]] {
for customer in customers {
if let id = customer["ID"] as? String {
self.ids.append(id)
}
if let name = customer["sysName"] as? String {
self.names.append(name)
}
if let address = customer["mainAddr"] as? String {
self.addresses.append(address)
}
}
}
} catch {
print("Error deserializing JSON: \(error)")
}
// build sections based on first letter(json is already sorted alphabetically)
var index = 0;
var firstCharacterArray:[String] = [" "]
for i in 0 ..< self.names.count {
let stringToTest = self.names[i].uppercased()
let firstCharacter = String(stringToTest[stringToTest.startIndex])
if(i == 0){
firstCharacterArray.append(firstCharacter)
}
if !firstCharacterArray.contains(firstCharacter) {
let title = firstCharacterArray[firstCharacterArray.count - 1]
firstCharacterArray.append(firstCharacter)
let newSection = (index: index, length: i - index, title: title)
self.sections.append(newSection)
index = i;
}
if(i == self.names.count - 1){
let title = firstCharacterArray[firstCharacterArray.count - 1]
let newSection = (index: index, length: i - index, title: title)
self.sections.append(newSection)
}
}
self.layoutViews()
}
}
func layoutViews(){
indicator.dismissIndicator()
searchController = UISearchController(searchResultsController: nil)
searchController.searchBar.placeholder = "Search Customers"
searchController.searchResultsUpdater = self
searchController.delegate = self
searchController.searchBar.delegate = self
searchController.dimsBackgroundDuringPresentation = false
searchController.hidesNavigationBarDuringPresentation = false
navigationItem.titleView = searchController.searchBar
let items = ["Name","Address"]
let customSC = SegmentedControl(items: items)
customSC.selectedSegmentIndex = 0
customSC.addTarget(self, action: #selector(self.changeSearchOptions(sender:)), for: .valueChanged)
self.view.addSubview(customSC)
self.customerTableView.delegate = self
self.customerTableView.dataSource = self
self.customerTableView.register(CustomerTableViewCell.self, forCellReuseIdentifier: "cell")
self.view.addSubview(self.customerTableView)
//auto layout group
let viewsDictionary = [
"view2":customSC,
"view3":self.customerTableView
]as [String:AnyObject]
let sizeVals = ["fullWidth": layoutVars.fullWidth,"width": layoutVars.fullWidth - 30,"navBottom":layoutVars.navAndStatusBarHeight,"height": self.view.frame.size.height - 100] as [String:Any]
self.view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[view2(fullWidth)]", options: [], metrics: sizeVals, views: viewsDictionary))
self.view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[view3(fullWidth)]", options: [], metrics: sizeVals, views: viewsDictionary))
self.view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-navBottom-[view2(40)][view3(height)]", options: [], metrics: sizeVals, views: viewsDictionary))
}
func changeSearchOptions(sender: UISegmentedControl) {
switch sender.selectedSegmentIndex {
case 0:
currentSearchMode = .name
break
case 1:
currentSearchMode = .address
break
default:
currentSearchMode = .name
break
}
filterSearchResults()
}
func updateSearchResults(for searchController: UISearchController) {
filterSearchResults()
}
func filterSearchResults(){
customersSearchResults = []
switch currentSearchMode {
case .name:
self.customersSearchResults = self.names.filter({( aCustomer: String ) -> Bool in
return (aCustomer.lowercased().range(of: self.searchController.searchBar.text!.lowercased()) != nil) })
break
case .address:
self.customersSearchResults = self.addresses.filter({( aCustomer: String) -> Bool in
return (aCustomer.lowercased().range(of: self.searchController.searchBar.text!.lowercased()) != nil)
})
break
}
self.customerTableView.reloadData()
}
func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
//print("searchBarTextDidBeginEditing")
shouldShowSearchResults = true
self.customerTableView.reloadData()
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
shouldShowSearchResults = false
self.customerTableView.reloadData()
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
if !shouldShowSearchResults {
shouldShowSearchResults = true
self.customerTableView.reloadData()
}
searchController.searchBar.resignFirstResponder()
}
/////////////// TableView Delegate Methods ///////////////////////
func numberOfSections(in tableView: UITableView) -> Int {
if shouldShowSearchResults{
return 1
}else{
return sections.count
}
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
//print("titleForHeaderInSection")
if shouldShowSearchResults{
return nil
}else{
if(sections[section].title == "#"){
return " # \(self.totalCustomers) Customers Found"
}else{
return " " + sections[section].title //hack way of indenting section text
}
}
}
func sectionIndexTitles(for tableView: UITableView) -> [String]?{
print("sectionIndexTitlesForTableView 1")
if shouldShowSearchResults{
return nil
}else{
//print("sectionIndexTitlesForTableView \(sections.map { $0.title })")
return sections.map { $0.title }
}
}
func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
//print("heightForHeaderInSection")
if shouldShowSearchResults{
return 0
}else{
return 50
}
}
func tableView(_ tableView: UITableView, sectionForSectionIndexTitle title: String, at index: Int) -> Int {
return index
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
//print("numberOfRowsInSection")
if shouldShowSearchResults{
return self.customersSearchResults.count
} else {
return sections[section].length
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = customerTableView.dequeueReusableCell(withIdentifier: "cell") as! CustomerTableViewCell
customerTableView.rowHeight = 50.0
if shouldShowSearchResults{
let searchString = self.searchController.searchBar.text!.lowercased()
if(currentSearchMode == .name){
cell.nameLbl.text = self.customersSearchResults[indexPath.row]
cell.name = self.customersSearchResults[indexPath.row]
if let i = self.names.index(of: cell.nameLbl.text!) {
//print("\(cell.nameLbl.text!) is at index \(i)")
cell.addressLbl.text = self.addresses[i]
cell.address = self.addresses[i]
cell.id = self.ids[i]
} else {
cell.addressLbl.text = ""
cell.address = ""
cell.id = ""
}
//text highlighting
let baseString:NSString = cell.name as NSString
let highlightedText = NSMutableAttributedString(string: cell.name)
var error: NSError?
let regex: NSRegularExpression?
do {
regex = try NSRegularExpression(pattern: searchString, options: .caseInsensitive)
} catch let error1 as NSError {
error = error1
regex = nil
}
if let regexError = error {
print("Oh no! \(regexError)")
} else {
for match in (regex?.matches(in: baseString as String, options: NSRegularExpression.MatchingOptions(), range: NSRange(location: 0, length: baseString.length)))! as [NSTextCheckingResult] {
highlightedText.addAttribute(NSBackgroundColorAttributeName, value: UIColor.yellow, range: match.range)
}
}
cell.nameLbl.attributedText = highlightedText
}else{//address search mode
cell.addressLbl.text = self.customersSearchResults[indexPath.row]
cell.address = self.customersSearchResults[indexPath.row]
if let i = self.addresses.index(of: cell.addressLbl.text!) {
cell.nameLbl.text = self.names[i]
cell.name = self.names[i]
cell.id = self.ids[i]
} else {
cell.nameLbl.text = ""
cell.name = ""
cell.id = ""
}
//text highlighting
let baseString:NSString = cell.address as NSString
let highlightedText = NSMutableAttributedString(string: cell.address)
var error: NSError?
let regex: NSRegularExpression?
do {
regex = try NSRegularExpression(pattern: searchString, options: .caseInsensitive)
} catch let error1 as NSError {
error = error1
regex = nil
}
if let regexError = error {
print("Oh no! \(regexError)")
} else {
for match in (regex?.matches(in: baseString as String, options: NSRegularExpression.MatchingOptions(), range: NSRange(location: 0, length: baseString.length)))! as [NSTextCheckingResult] {
highlightedText.addAttribute(NSBackgroundColorAttributeName, value: UIColor.yellow, range: match.range)
}
}
cell.addressLbl.attributedText = highlightedText
}
} else {
//print("make cell")
cell.id = self.ids[sections[indexPath.section].index + indexPath.row]
cell.name = self.names[sections[indexPath.section].index + indexPath.row]
cell.address = self.addresses[sections[indexPath.section].index + indexPath.row]
cell.nameLbl.text = self.names[sections[indexPath.section].index + indexPath.row]
cell.addressLbl.text = self.addresses[sections[indexPath.section].index + indexPath.row]
}
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let indexPath = tableView.indexPathForSelectedRow;
let currentCell = tableView.cellForRow(at: indexPath!) as! CustomerTableViewCell
let customerViewController = CustomerViewController(_customerID: currentCell.id)
navigationController?.pushViewController(customerViewController, animated: false )
tableView.deselectRow(at: indexPath!, animated: true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}