2
我对Swift/Xcode非常非常新，只是在黑暗中拍打着......我很迷茫。我有一个加载的屏幕，里面有一个包含两个子视图的视图：MKMapView和UITAbleView。在XCode 8中使用Swift 3，如何控制UITableView子视图
地图加载完美，但我似乎无法正确控制表格并加载数据，因为当我点击“显示附近的餐馆”时，应用程序崩溃。
以下是完整的调试追踪我越来越：
2016-10-10 10:28:59.516777 Restaurants[93314:1607613] bundleid: com.Example.Restaurants, enable_level: 0, persist_level: 0, propagate_with_activity: 0
2016-10-10 10:28:59.517100 Restaurants[93314:1607613] subsystem: com.apple.siri, category: Intents, enable_level: 1, persist_level: 1, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 0, enable_private_data: 0
2016-10-10 10:28:59.524112 Restaurants[93314:1607821] subsystem: com.apple.UIKit, category: HIDEventFiltered, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 1, privacy_setting: 2, enable_private_data: 0
2016-10-10 10:28:59.526181 Restaurants[93314:1607821] subsystem: com.apple.UIKit, category: HIDEventIncoming, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 1, privacy_setting: 2, enable_private_data: 0
2016-10-10 10:28:59.535733 Restaurants[93314:1607818] subsystem: com.apple.BaseBoard, category: MachPort, enable_level: 1, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 0, enable_private_data: 0
2016-10-10 10:28:59.548057 Restaurants[93314:1607613] subsystem: com.apple.UIKit, category: StatusBar, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 1, privacy_setting: 2, enable_private_data: 0
2016-10-10 10:28:59.564 Restaurants[93314:1607613] Unknown class _TtC22Restaurant18RootViewController in Interface Builder file.
2016-10-10 10:28:59.662817 Restaurants[93314:1607818] subsystem: com.apple.libsqlite3, category: logging, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 1, privacy_setting: 2, enable_private_data: 0
2016-10-10 10:28:59.676411 Restaurants[93314:1607823] subsystem: com.apple.network, category: , enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 2, enable_private_data: 0
2016-10-10 10:28:59.676674 Restaurants[93314:1607823] [] tcp_connection_create_with_endpoint_and_parameters 1 restaurants.example.com 80
2016-10-10 10:28:59.677043 Restaurants[93314:1607823] [] tcp_connection_start 1 starting
2016-10-10 10:28:59.677355 Restaurants[93314:1607823] [] nw_connection_create creating connection to restaurants.example.com:80
2016-10-10 10:28:59.677626 Restaurants[93314:1607823] [] tcp_connection_start starting tc_nwconn=0x7ff21100b610
2016-10-10 10:28:59.677833 Restaurants[93314:1607818] [] __nw_connection_start_block_invoke 1 starting
2016-10-10 10:28:59.678105 Restaurants[93314:1607818] [] nw_endpoint_handler_start [1 restaurants.example.com:80 initial path (null)]
2016-10-10 10:28:59.678293 Restaurants[93314:1607818] [] nw_connection_endpoint_report [1 restaurants.example.com:80 initial path (null)] reported event path:start
2016-10-10 10:28:59.678993 Restaurants[93314:1607818] [] nw_endpoint_handler_path_change [1 restaurants.example.com:80 waiting path (satisfied)]
2016-10-10 10:28:59.679235 Restaurants[93314:1607818] [] nw_connection_endpoint_report [1 restaurants.example.com:80 waiting path (satisfied)] reported event path:satisfied
2016-10-10 10:28:59.679788 Restaurants[93314:1607818] [] nw_connection_endpoint_report [1 restaurants.example.com:80 waiting path (satisfied)] skipping state update
2016-10-10 10:28:59.680194 Restaurants[93314:1607818] [] nw_endpoint_proxy_handler_should_use_proxy Looking up proxy for hostname: restaurants.example.com, ifindex: 0
2016-10-10 10:28:59.680805 Restaurants[93314:1607818] subsystem: com.apple.SystemConfiguration, category: SCPreferences, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 2, enable_private_data: 0
2016-10-10 10:28:59.681819 Restaurants[93314:1607818] [] -[NWConcrete_nw_endpoint_resolver startWithHandler:] [1 restaurants.example.com:80 waiting resolver (satisfied)]
2016-10-10 10:28:59.682059 Restaurants[93314:1607818] [] nw_connection_endpoint_report [1 restaurants.example.com:80 in_progress resolver (satisfied)] reported event resolver:start_dns
2016-10-10 10:28:59.682582 Restaurants[93314:1607818] [] nw_resolver_create_dns_service_on_queue Starting host resolution restaurants.example.com:80, flags 0x4000d000
2016-10-10 10:28:59.687044 Restaurants[93314:1607613] subsystem: com.apple.BackBoardServices.fence, category: App, enable_level: 1, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 0, enable_private_data: 0
2016-10-10 10:28:59.876823 Restaurants[93314:1607823] [] nw_resolver_host_resolve_callback flags=0x2 ifindex=0 error=NoError(0) hostname=us-east-1-a.route.herokuapp.com. addr=23.23.196.165:0 ttl=75
2016-10-10 10:28:59.877069 Restaurants[93314:1607823] [] nw_resolver_start_query_timer Starting 1s query timer to receive all address families for restaurants.example.com:80
2016-10-10 10:28:59.877302 Restaurants[93314:1607823] [] nw_resolver_start_crazy_eyeballs_timer Received IPv4 result first, performing crazy eyeballs: waiting 50ms on IPv6 for restaurants.example.com:80
2016-10-10 10:28:59.999464 Restaurants[93314:1607823] [] __nw_resolver_start_crazy_eyeballs_timer_block_invoke Crazy eyeballs timer fired: did not receive IPv6 in time, reporting only IPv4 result for restaurants.example.com:80
2016-10-10 10:28:59.999686 Restaurants[93314:1607823] [] nw_resolver_cancel_crazy_eyeballs_timer Cancelling crazy eyeballs timer for restaurants.example.com
2016-10-10 10:29:00.000005 Restaurants[93314:1607823] [] nw_endpoint_resolver_update [1 restaurants.example.com:80 in_progress resolver (satisfied)] resolver is in_progress
2016-10-10 10:29:00.000373 Restaurants[93314:1607823] [] nw_endpoint_resolver_update [1 restaurants.example.com:80 in_progress resolver (satisfied)] Adding endpoint handler for 23.23.196.165:80
2016-10-10 10:29:00.001412 Restaurants[93314:1607823] [] nw_endpoint_resolver_update [1 restaurants.example.com:80 in_progress resolver (satisfied)] Updated endpoint list is (23.23.196.165:80)
2016-10-10 10:29:00.001998 Restaurants[93314:1607823] [] nw_connection_endpoint_report [1 restaurants.example.com:80 in_progress resolver (satisfied)] reported event resolver:receive_dns
2016-10-10 10:29:00.002690 Restaurants[93314:1607823] [] nw_endpoint_resolver_start_next_child [1 restaurants.example.com:80 in_progress resolver (satisfied)] starting child endpoint 23.23.196.165:80
2016-10-10 10:29:00.003071 Restaurants[93314:1607823] [] nw_endpoint_resolver_start_next_child [1 restaurants.example.com:80 in_progress resolver (satisfied)] starting next child endpoint in 178ms
2016-10-10 10:29:00.003507 Restaurants[93314:1607823] [] nw_endpoint_handler_start [1.1 23.23.196.165:80 initial path (null)]
2016-10-10 10:29:00.003841 Restaurants[93314:1607823] [] nw_endpoint_resolver_receive_report [1 restaurants.example.com:80 in_progress resolver (satisfied)] received child report:[1.1 23.23.196.165:80 initial path (null)]
2016-10-10 10:29:00.004089 Restaurants[93314:1607823] [] nw_connection_endpoint_report [1.1 23.23.196.165:80 initial path (null)] reported event path:start
2016-10-10 10:29:00.004526 Restaurants[93314:1607823] [] nw_endpoint_handler_path_change [1.1 23.23.196.165:80 waiting path (satisfied)]
2016-10-10 10:29:00.004791 Restaurants[93314:1607823] [] nw_endpoint_resolver_receive_report [1 restaurants.example.com:80 in_progress resolver (satisfied)] received child report:[1.1 23.23.196.165:80 waiting path (satisfied)]
2016-10-10 10:29:00.005035 Restaurants[93314:1607823] [] nw_connection_endpoint_report [1.1 23.23.196.165:80 waiting path (satisfied)] reported event path:satisfied
2016-10-10 10:29:00.005323 Restaurants[93314:1607823] [] nw_endpoint_proxy_handler_should_use_proxy Looking up proxy for hostname: <nil>, ifindex: 0
2016-10-10 10:29:00.006192 Restaurants[93314:1607823] [] -[NWConcrete_nw_endpoint_flow startWithHandler:] [1.1 23.23.196.165:80 waiting socket-flow (satisfied)]
2016-10-10 10:29:00.006437 Restaurants[93314:1607823] [] nw_endpoint_flow_setup_socket [1.1 23.23.196.165:80 in_progress socket-flow (satisfied)] creating socket
2016-10-10 10:29:00.006818 Restaurants[93314:1607823] [] nw_endpoint_flow_attach_protocols [1.1 23.23.196.165:80 in_progress socket-flow (satisfied)]
2016-10-10 10:29:00.007388 Restaurants[93314:1607823] [] nw_endpoint_flow_attach_protocols [1.1 23.23.196.165:80 in_progress socket-flow (satisfied)] Attached flow protocol
2016-10-10 10:29:00.007722 Restaurants[93314:1607823] [] nw_endpoint_resolver_receive_report [1 restaurants.example.com:80 in_progress resolver (satisfied)] received child report:[1.1 23.23.196.165:80 in_progress socket-flow (satisfied)]
2016-10-10 10:29:00.008528 Restaurants[93314:1607823] [] nw_connection_endpoint_report [1.1 23.23.196.165:80 in_progress socket-flow (satisfied)] reported event flow:start_connect
2016-10-10 10:29:00.017739 Restaurants[93314:1607823] [] nw_resolver_host_resolve_callback flags=0x2 ifindex=0 error=NoSuchRecord(-65554) hostname=us-east-1-a.route.herokuapp.com. addr=::.0 ttl=77
2016-10-10 10:29:00.017976 Restaurants[93314:1607823] [] nw_resolver_cancel_query_timer Cancelling query timer for restaurants.example.com
2016-10-10 10:29:00.018285 Restaurants[93314:1607823] [] nw_endpoint_resolver_update [1 restaurants.example.com:80 in_progress resolver (satisfied)] resolver is complete
2016-10-10 10:29:00.018545 Restaurants[93314:1607823] [] nw_endpoint_resolver_update [1 restaurants.example.com:80 in_progress resolver (satisfied)] Keeping started endpoint 23.23.196.165:80
2016-10-10 10:29:00.018797 Restaurants[93314:1607823] [] nw_endpoint_resolver_update [1 restaurants.example.com:80 in_progress resolver (satisfied)] Updated endpoint list is (23.23.196.165:80)
2016-10-10 10:29:00.019050 Restaurants[93314:1607823] [] nw_connection_endpoint_report [1 restaurants.example.com:80 in_progress resolver (satisfied)] reported event resolver:receive_dns
2016-10-10 10:29:00.166619 Restaurants[93314:1607818] [] nw_socket_handle_socket_event Event mask: 0x800
2016-10-10 10:29:00.166833 Restaurants[93314:1607818] [] nw_socket_handle_socket_event Socket received CONNECTED event
2016-10-10 10:29:00.167079 Restaurants[93314:1607818] [] nw_socket_setup_notsent_lowat Set TCP_NOTSENT_LOWAT(16384)
2016-10-10 10:29:00.167332 Restaurants[93314:1607818] [] nw_endpoint_flow_protocol_connected [1.1 23.23.196.165:80 in_progress socket-flow (satisfied)] Output protocol connected
2016-10-10 10:29:00.167891 Restaurants[93314:1607818] [] nw_endpoint_flow_connected_path_change [1.1 23.23.196.165:80 ready socket-flow (satisfied)]
2016-10-10 10:29:00.168068 Restaurants[93314:1607818] [] nw_endpoint_flow_connected_path_change [1.1 23.23.196.165:80 ready socket-flow (satisfied)] Connected path is satisfied
2016-10-10 10:29:00.168271 Restaurants[93314:1607818] [] nw_endpoint_resolver_receive_report [1 restaurants.example.com:80 in_progress resolver (satisfied)] received child report:[1.1 23.23.196.165:80 ready socket-flow (satisfied)]
2016-10-10 10:29:00.168527 Restaurants[93314:1607818] [] nw_connection_endpoint_report [1.1 23.23.196.165:80 ready socket-flow (satisfied)] reported event flow:finish_connect
2016-10-10 10:29:00.168796 Restaurants[93314:1607818] [] nw_connection_endpoint_report [1 restaurants.example.com:80 ready resolver (satisfied)] reported event flow:finish_connect
2016-10-10 10:29:00.169019 Restaurants[93314:1607818] [] nw_endpoint_resolver_receive_report [1 restaurants.example.com:80 ready resolver (satisfied)] received child report:[1.1 23.23.196.165:80 ready socket-flow (satisfied)]
2016-10-10 10:29:00.169219 Restaurants[93314:1607818] [] nw_connection_endpoint_report [1.1 23.23.196.165:80 ready socket-flow (satisfied)] reported event flow:changed_viability
2016-10-10 10:29:00.169415 Restaurants[93314:1607818] [] nw_connection_endpoint_report [1 restaurants.example.com:80 ready resolver (satisfied)] reported event flow:changed_viability
2016-10-10 10:29:00.169714 Restaurants[93314:1607823] [] __tcp_connection_start_block_invoke 1 sending event TCP_CONNECTION_EVENT_CONNECTED in response to state ready and error (null)
2016-10-10 10:29:00.169913 Restaurants[93314:1607823] [] tcp_connection_event_notify 1 event: TCP_CONNECTION_EVENT_CONNECTED, reason: nw_connection event, should deliver: true
2016-10-10 10:29:00.170271 Restaurants[93314:1607823] [] tcp_connection_get_statistics DNS: 320ms/323ms since start, TCP: 160ms/490ms since start, TLS: 0ms/0ms since start
2016-10-10 10:29:27.664045 Restaurants[93314:1607613] subsystem: com.apple.UIKit, category: Touch, enable_level: 0, persist_level: 0, default_ttl: 1, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 1, privacy_setting: 2, enable_private_data: 0
2016-10-10 10:29:27.664832 Restaurants[93314:1607613] subsystem: com.apple.UIKit, category: Gesture, enable_level: 0, persist_level: 0, default_ttl: 1, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 1, privacy_setting: 2, enable_private_data: 0
2016-10-10 10:29:27.665446 Restaurants[93314:1607613] subsystem: com.apple.UIKit, category: GestureEnvironment, enable_level: 0, persist_level: 0, default_ttl: 1, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 1, privacy_setting: 2, enable_private_data: 0
2016-10-10 10:29:27.665830 Restaurants[93314:1607613] subsystem: com.apple.UIKit, category: GestureExclusion, enable_level: 0, persist_level: 0, default_ttl: 1, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 1, privacy_setting: 2, enable_private_data: 0
2016-10-10 10:29:27.846 Restaurants[93314:1607613] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[UITableViewController loadView] instantiated view controller with identifier "UIViewController-Wgc-6W-3v8" from storyboard "Main", but didn't get a UITableView.'
*** First throw call stack:
(
0 CoreFoundation 0x000000010819f34b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x00000001078d821e objc_exception_throw + 48
2 CoreFoundation 0x0000000108208265 +[NSException raise:format:] + 197
3 UIKit 0x00000001089e383c -[UITableViewController loadView] + 638
4 UIKit 0x0000000108763c4c -[UIViewController loadViewIfRequired] + 201
5 UIKit 0x000000010876a4d6 -[UIViewController __viewWillAppear:] + 118
6 UIKit 0x0000000108795393 -[UINavigationController _startCustomTransition:] + 1290
7 UIKit 0x00000001087a6008 -[UINavigationController _startDeferredTransitionIfNeeded:] + 697
8 UIKit 0x00000001087a719b -[UINavigationController __viewWillLayoutSubviews] + 58
9 UIKit 0x000000010899e1b7 -[UILayoutContainerView layoutSubviews] + 223
10 UIKit 0x0000000108687344 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1237
11 QuartzCore 0x000000010fc9ecdc -[CALayer layoutSublayers] + 146
12 QuartzCore 0x000000010fc927a0 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
13 QuartzCore 0x000000010fc9261e _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
14 QuartzCore 0x000000010fc2062c _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 280
15 QuartzCore 0x000000010fc4d713 _ZN2CA11Transaction6commitEv + 475
16 UIKit 0x00000001085bc067 _UIApplicationFlushRunLoopCATransactionIfTooLate + 206
17 UIKit 0x0000000108dcbb30 __handleEventQueue + 5672
18 CoreFoundation 0x0000000108144311 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
19 CoreFoundation 0x000000010812959c __CFRunLoopDoSources0 + 556
20 CoreFoundation 0x0000000108128a86 __CFRunLoopRun + 918
21 CoreFoundation 0x0000000108128494 CFRunLoopRunSpecific + 420
22 GraphicsServices 0x000000010fb81a6f GSEventRunModal + 161
23 UIKit 0x00000001085c2f34 UIApplicationMain + 159
24 Restaurants 0x0000000106d157af main + 111
25 libdyld.dylib 0x000000010b5d468d start + 1
26 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
这里是我的代码，它控制视图 “NearbyDataViewController.swift”：
import UIKit
import Alamofire
import SwiftyJSON
import MapKit
import CoreLocation
class NearbyDataViewController: UITableViewController, CLLocationManagerDelegate {
@IBOutlet weak var nearbyMap: MKMapView!
@IBOutlet weak var nearbyTable: UITableView!
// json from server
var nearbyRestaurantsJSON:JSON = []
// constant for holding the user's location
let locationManager = CLLocationManager()
override func viewDidLoad(){
super.viewDidLoad()
//
// Set table view
//
self.nearbyTable.delegate = self
self.nearbyTable.dataSource = self
self.nearbyTable.allowsSelection = true
///////////////////
// Load Map //
///////////////////
self.locationManager.delegate = self
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
self.locationManager.requestWhenInUseAuthorization()
self.locationManager.startUpdatingLocation()
self.nearbyMap.showsUserLocation = true
///////////////////
// Query Server //
///////////////////
//
// Request data for nearby restaurants
//
let latText = String(format: "%f", (self.locationManager.location?.coordinate.latitude)!)
let lonText = String(format: "%f", (self.locationManager.location?.coordinate.longitude)!)
print("XXXXXXXXX USER LOCATION XXXXXXXXX: " + latText + ", " + lonText)
let server_url:String = "http://www.example.com/&lat=" + latText + "&lon=" + lonText
Alamofire.request(server_url).responseJSON { response in
// load resposne into into SwiftyJSON to parse JSON
let json = JSON(response.result.value)
// show response
self.nearbyRestaurantsJSON = json["objects"]
debugPrint(self.nearbyRestaurantsJSON)
// load the table
DispatchQueue.main.async {
self.nearbyTable.reloadData()
return
}
}
}
//
// Enable the location manager
//
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations.last
let center = CLLocationCoordinate2D(latitude: location!.coordinate.latitude, longitude: location!.coordinate.longitude)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.005, longitudeDelta: 0.005))
self.nearbyMap.setRegion(region, animated: true)
self.locationManager.stopUpdatingLocation()
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
print("Errors: " + error.localizedDescription)
}
//
// Table Data Parse
//
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return nearbyRestaurantsJSON.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
// change the label text to the restaurant name
cell.textLabel?.text = nearbyRestaurantsJSON[indexPath.row]["rest_name"].string
// get length of inspection reports and find most recent
var insp_dates = [Date?]()
let dateformatter = DateFormatter()
dateformatter.dateFormat = "yyyy-MM-dd"
for (_, subJson):(String, JSON) in (nearbyRestaurantsJSON[indexPath.row]["onlinereports"]) {
// convert string to date
let date_string = subJson["insp_date"].string
let dt = dateformatter.date(from: date_string!)
insp_dates.append(dt)
}
let dt = insp_dates.sorted{ (firstThing, secondThing) -> Bool in
firstThing! > secondThing!
}.first
let dt_str = dateformatter.string(from: dt!!)
// match the date to the json object
for (_, subJson):(String, JSON) in (nearbyRestaurantsJSON[indexPath.row]["onlinereports"]) {
if subJson["insp_date"].string == dt_str {
if Double(subJson["insp_score"].string!)! + 1 < 37.0 {
cell.imageView?.image = UIImage(named: "thumbs_down")
}
else {
cell.imageView?.image = UIImage(named: "thumbs_up")
}
}
}
return cell
}
}
我的故事板布局： 
根视图的代表/出口（NearbyDataViewController）： 
代表/对nearbyMap插座：用于nearbyTable 
代表/销售点： 
嗨@alex，感谢您的帮助。我认为我做了你所指示的改变，所以我的班级现在看你的榜样。我没有改变dataSource（我应该有吗？）。我现在面临的问题是在评论“Table Data Parse”下列出的覆盖函数：numberOfSections和tableView。 Xcode报告，“方法不会覆盖其超类中的任何方法”。我不知道如何解决这个问题，因为我对斯威夫特的理解非常差。我尝试将该函数分配给一个变量，然后从viewDidLoad（）调用该函数，或者将这些方法链接到self.nearbyTable ...但都不起作用。 – Twitch
只需删除“覆盖”关键字。这个词之前有意义，因为这些方法在UITableViewController中实现，但它们不在UIViewController中。 – alexburtnik
噢哇...是的，那对我来说并不直观，而且让我疯狂。我不明白这些函数是如何在没有覆盖的情况下触发的，所以我需要在Swift上做更多的阅读。真的，谢谢你，谢谢。 – Twitch