小编mar*_*tus的帖子

我用Swift 2将Xcode 6更新为Xcode 7 beta.我收到此错误,我无法找到解决方法,请帮助我.谢谢.这是我的代码:

 func locationManager(manager: CLLocationManager, didUpdateLocations locations: [AnyObject]) {
    let location = locations.last as! CLLocation

    let center = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
    let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))

    self.map.setRegion(region, animated: true)
}

我收到此错误:

Objective-C method 'locationManager:didUpdateLocations:' provided by method 'locationManager(_:didUpdateLocations:)' conflicts with optional requirement method 'locationManager(_:didUpdateLocations:)' in protocol 'CLLocationManagerDelegate'

昨天我更新到El Capitan beta 2和Xcode 7 - beta是强制性的.所以我将我的应用程序更新为Swift 2,并且新的错误出现在json字符串中.这是我的代码:

let jsonData:NSDictionary = NSJSONSerialization.JSONObjectWithData(urlData!, options:NSJSONReadingOptions.MutableContainers ) as! NSDictionary

这是错误: Call can throw , but it is not marked with 'try' and the error is not handled

嗨我用Xcode 7将我的项目从Swift更新到Swift2,我得到了这个CoreData错误:

Extra argument 'error' in call

在这一行

if coordinator!.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: nil, error: &error) == nil {

编辑

这是我的代码:

lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator? = {
        // The persistent store coordinator for the application. This implementation creates and return a coordinator, having added the store for the application to it. This property is optional since there are legitimate error conditions that could cause the creation of the store to fail.
        // Create the coordinator and store
        var …

我正在使用Xcode 7将我的应用程序更新为Swift 2.这是我的ViewController viewDidLoad的代码.

 override func viewDidLoad() {
        super.viewDidLoad()

    // Get an instance of the AVCaptureDevice class to initialize a device object and provide the video
    // as the media type parameter.
    let captureDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)

    // Get an instance of the AVCaptureDeviceInput class using the previous device object.
    var error:NSError?

    let input: AnyObject! = AVCaptureDeviceInput.deviceInputWithDevice(captureDevice, error: &error)

    if (error != nil) {
        // If any error occurs, simply log the description of it and don't continue any more.
        print("\(error?.localizedDescription)") …

嗨我的应用程序第一次运行时崩溃了.这是我的代码:

 let State = save.stringForKey("StateSave")
 let City = save.stringForKey("CitySave")
 let Vehicle = save.stringForKey("ModelNumberSave")
 let ExtensionPeriod = save.stringForKey("ExtensionPeriodChoosed")
 let Location = "Location"


 if ExtensionPeriod == nil {
      let name = ""
      var FieldChoosed: Void = save.setObject(name, forKey: "ExtensionPeriodChoosed")
      save.synchronize()

 }

 save.synchronize()
 var DetailNames = ["\(State!)","\(City!)","\(Location)","\(Vehicle!)","\(ExtensionPeriod!)"]

我得到了nil这条线:

var DetailNames = ["(State!)","(City!)","(Location)","(Vehicle!)","(ExtensionPeriod!)"]

实际上ExtensionPeriod是nil.但我不明白为什么...... ExtensionPeriod是nil,但是我写的代码ExtensionPeriod会像""所以不是nil.请帮我.