我正在尝试解析一些天气数据，但我遇到了一个问题。我在一个数组中创建了一个默认值，为用户在表视图中提供了一个虚拟位置和值。使用下面我尝试用于实际数据的相同代码解包此值。它适用于虚拟值，可以轻松找到locationStore，但是当我从具有已解析数据的视图加载时，locationStore在调试器中显示为nil。我不知道如何解决这个问题，所以非常感谢任何帮助。
class LocationWeatherViewController: UITableViewController{
var locationStore: LocationStore!
var imageStore: ImageStore!
var newLocation: Location!
var locationCreated : NSMutableArray = NSMutableArray( array: ["Test ", 0, 0.0, 0.0 , 0.0])
override func viewDidLoad() {
super.viewDidLoad()
print(locationCreated.count)
if let locationName = locationCreated[0] as? String {
print(locationName)
if let currentTemp = locationCreated[2] as? Double{
print(currentTemp)
if let zip32 = (locationCreated[1] as? Int){
let zip = Int64(zip32)
print(zip)
if let xCrd = locationCreated[3] as? Double{
print(xCrd)
if let yCrd = locationCreated[4] as? Double{
print(yCrd)
newLocation = locationStore.createLocation(false, location: locationName, currentTemp: currentTemp, zipCode: zip, xCord: xCrd, yCord: yCrd)
if let index = locationStore.allLocations.indexOf(newLocation){
let indexPath = NSIndexPath(forRow: index, inSection: 0)
tableView.insertRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)
}
}
}
}
}
}
}
func createLocation(random: Bool, location: String, currentTemp: Double, zipCode: Int64, xCord: Double, yCord: Double ) -> Location{
if !random{
let newLocation = Location(random: false, locationNme: location, currentTmperature: currentTemp, locationZpCode: zipCode, xCrd: xCord, yCrd: yCord)
allLocations.append(newLocation)
return newLocation
}
LocationStore：
let newLocation = Location(random: true, locationNme: location, currentTmperature: currentTemp, locationZpCode: zipCode, xCrd: xCord, yCrd: yCord)
allLocations.append(newLocation)
return newLocation
}
位置：
init( locationName: String, currentTemperature: Double, locationZipCode: Int64, xCord: Double, yCord: Double){
self.locationName = locationName
self.currentTemperature = currentTemperature
self.locationZipCode = Int64(locationZipCode)
self.xCord = xCord
self.yCord = yCord
self.itemKey = NSUUID().UUIDString
super.init()
}
convenience init( random:Bool = false, locationNme: String, currentTmperature: Double, locationZpCode: Int64, xCrd: Double, yCrd: Double ){
if random {
let locations = ["Louisville", "Gainesville", "Austin", "San Francisco"]
//38.2527, 85.7585
//29.6516, 82.3248
// 30.2672, -97.7431
// 37.7749, -122.4194
let xCords = [38.2527, 29.6516, 30.2672, 37.7749 ]
let yCords = [-85.7585, -82.3248, -97.7431, -122.4194 ]
let zips = [40217, 32608, 77878, 46454]
let temps = [76.0, 101.3, 95.4, 68.5]
var idx = arc4random_uniform(UInt32(locations.count))
let randomLocation = locations[Int(idx)]
let randomLocationxCord = xCords[Int(idx)]
let randomLocationyCord = yCords[Int(idx)]
let randomZip = zips[Int(idx)]
idx = arc4random_uniform(UInt32(temps.count))
let randomTemp = temps[Int(idx)]
self.init ( locationName: randomLocation, currentTemperature: randomTemp, locationZipCode: Int64(randomZip), xCord: randomLocationxCord, yCord: randomLocationyCord)
}
else{
self.init( locationName: locationNme, currentTemperature: currentTmperature, locationZipCode: locationZpCode, xCord: xCrd, yCord: yCrd)
}
}
APIFinder：
func useAPI(zipCode: Int) -> NSArray{
let session = NSURLSession(configuration: NSURLSessionConfiguration.defaultSessionConfiguration())
let locationURL = NSURL( string: "http://api.openweathermap.org/data/2.5/forecast/city?zip=\(zipCode),us&APPID=74b78f4effe729b2a841cb35e3862d85")
let request = NSURLRequest(URL: locationURL!)
let task = session.dataTaskWithRequest(request) {
(data,response, error) -> Void in
if let locationData = data {
if let jsonString = NSString( data:locationData,encoding: NSUTF8StringEncoding){
let data = jsonString.dataUsingEncoding(NSUTF8StringEncoding)
do {
let json = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as! [String: AnyObject]
if let city = json["city"]{
if let name = city["name"]{
self.locationArray[0] = name!
self.locationArray[1] = zipCode
}
if let coord = city["coord"]{
if let xCord = coord!["lat"]{
self.locationArray[3] = xCord!
}
if let yCord = coord!["lon"]{
self.locationArray[4] = yCord!
}
}
}
if let list = json["list"]{
if let main = list[0]["main"]{
if let temp = main!["temp"]{
self.locationArray[2] = temp!
}
}
}
} catch let error as NSError {
print("Failed to load: \(error.localizedDescription)")
}
}
}
else if let requestError = error {
print("Error fetching weather data: \(requestError)")
}
else {
print("Unexpected error with request")
}
}
task.resume()
return locationArray
}
输出：
5
测试
0.0
0
0.0
0.0
5
哈特福德
295.54
42328
37.45116
-86.909157
致命错误：在解包可选值时意外发现nil
（lldb）
解决：
问题是我需要在segue中的视图之间传递LocationStore。一旦得到答案就会出现这样一个愚蠢的问题。 感谢您的所有帮助和建议。