【发布时间】：2016-06-30 01:20:58
【问题描述】：
知道如何使用 Alamofire 发出这个 GET 请求 - 得到我想要的东西 - 将信息传递给 func tableView(tableView: UITableView - 填充并返回每个单元格，但我的表格不会显示加载的数据？
从 AlamoFire 承诺的回报中，我调用 self.refresh()，它在主线程中调用它：
func refresh() {
dispatch_async(dispatch_get_main_queue(),{
self.tableView.reloadData()
});
-- 有任何想法吗？这简直让我发疯。提前感谢您的任何想法或解决方案！
import UIKit
import Alamofire
import MapKit
class ListViewController: UIViewController, UISearchBarDelegate, CLLocationManagerDelegate, UITableViewDelegate, UITableViewDataSource {
var tools = [Tool]()
@IBOutlet weak var searchBar: UISearchBar!
@IBOutlet weak var tableView: UITableView!
let locationManager = CLLocationManager()
var currentLat: CLLocationDegrees = 0.0
var currentLong: CLLocationDegrees = 0.0
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.delegate = self
self.tableView.dataSource = self
searchBar.delegate = self
self.tableView.rowHeight = UITableViewAutomaticDimension
self.tableView.estimatedRowHeight = 116
self.tableView.registerClass(ToolTableViewCell.self, forCellReuseIdentifier: "ToolTableViewCell")
self.locationManager.delegate = self
self.locationManager.requestAlwaysAuthorization()
self.locationManager.requestWhenInUseAuthorization()
// if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
locationManager.startUpdatingLocation()
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let locValue:CLLocationCoordinate2D = manager.location!.coordinate
// print("locations = \(locValue.latitude) \(locValue.longitude)")
let location = locations.last! as CLLocation
currentLat = location.coordinate.latitude
currentLong = location.coordinate.longitude
}
func searchBarSearchButtonClicked(searchbar: UISearchBar)
{
searchbar.resignFirstResponder()
tools = []
let defaults = NSUserDefaults.standardUserDefaults()
let userid: Int = defaults.objectForKey("toolBeltUserID") as! Int
let searchTerm = String(searchBar.text!)
print(searchTerm)
Alamofire.request(.GET, "http://localhost:3000/tools/search", parameters: ["keyword": searchTerm, "latitude": currentLat, "longitude": currentLong,
"user": userid]) .responseJSON {response in
if let JSON = response.result.value {
print("\(JSON)")
for i in 0 ..< JSON.count {
let owner = JSON[i].objectForKey("owner")
let tool = JSON[i].objectForKey("tool")
let title = tool!["title"] as! String!
let ownerId = owner!["id"] as! Int!
let distanceToTool = JSON[i].objectForKey("distance") as! Double
var description: String
if let des = tool!["description"] as? NSNull {
description = ""
} else {
description = (tool!["description"] as? String!)!
}
let myTool = Tool(title: title!, description: description, ownerId: ownerId!, distance: distanceToTool)
self.tools.append(myTool)
}
// dispatch_async(dispatch_get_main_queue(), {
self.refresh()
// })
} else {
print("Sent search term, but no response")
}
}
}
func refresh() {
dispatch_async(dispatch_get_main_queue(),{
self.tableView.reloadData()
});
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
print(tools.count)
return tools.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cellIdentifier = "ToolTableViewCell"
let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as!ToolTableViewCell
let tool = tools[indexPath.row]
if(indexPath.row==0){
cell.title?.text = tool.title
// print(tool.title)
// cell.toolListDescription?.text = tool.description
cell.ownerId = tool.ownerId
// print(tool.ownerId)
// print(tool.distance)
// cell.distance?.text = "\(tool.distance)mi"
}
print(cell)
return cell
}
}
【问题讨论】：
-
你得到什么输出？
numberOfRowsInSection被调用了吗？cellForRowAtIndexPath被调用了吗？您的表格视图是否在屏幕上（例如，约束设置正确）？ -
是的，是的，这就是令人困惑的地方。关于适当的约束 - 我如何在情节提要上确保这一点？
-
我通常做的第一件事是将背景颜色设置为亮绿色或其他东西，以便您可以查看 tableview 是否可见。检查情节提要中的橙色或红色约束警告。还要检查您的
cell.title属性是否为 nil - 在cellForRowAtIndexPath中设置断点并检查 -
(lldb) po cell.title.text 致命错误：在展开可选值错误时意外发现 nil：执行被中断，原因：EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)。
-
这是否表明标签未正确分配？
标签： ios xcode swift uitableview alamofire