swift2

问题 I'm trying to add a throws to my existing function with a completion handler but I keep getting a warning saying no calls throwing functions occur within try expression . In the section where I throw the errors, I get an error saying invalid conversion from throwing function of type '() throwing -> Void' to non-throwing function type. enum LoginError: ErrorType { case Invalid_Credentials case Unable_To_Access_Login case User_Not_Found } @IBAction func loginPressed(sender: AnyObject) { do{ try

问题 I have string array in Swift 2: var myList : [String] = [] And I have dynamic strings inside and I explode them with * character myList examples: print(myList[0]) output = 2018-04-05*type2*namea print(myList[1]) output = 2018-04-05*type2*nameb print(myList[2]) output = 2018-04-05*type3*nameb print(myList[3]) output = 2018-04-06*type3*named I want to delete objects have type3 ones in myList: IF IN same date AND same name AND have type2 ones Must be my strings like that: print(myList[0]) output

问题 Why is the compiler throwing an error for the following code that attempts to create a dictionary? How would you fix this code? let options = [ kCVPixelBufferCGImageCompatibilityKey: true, kCVPixelBufferCGBitmapContextCompatibilityKey: true] I've looked through all of the other related questions with this same error and have not been able to find a solution. 回答1: How about let options : [NSObject : AnyObject] = [ kCVPixelBufferCGImageCompatibilityKey: true,

问题 The following code: protocol ProtocolA { } protocol ProtocolB { typealias T: ProtocolA var value : Array<T> { get set } } class ProtocolC { func method<T: ProtocolA>(value: ProtocolB<T>) { } } Yields these errors: error: cannot specialize non-generic type 'ProtocolB' func method<T: ProtocolA>(value: ProtocolB<T>) error: generic parameter 'T' is not used in function signature func method<T: ProtocolA>(value: ProtocolB<T>) error: protocol 'ProtocolB' can only be used as a generic constraint

问题 in my app i implemented push notification. when my app is in running state and if push notification come i am handle that with this code. func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject]) { print(userInfo) myid = (userInfo["id"] as? String)! print(myid) if let notification = userInfo["aps"] as? NSDictionary, let alert = notification["alert"] as? String { var alertCtrl = UIAlertController(title: "Notification", message: alert as String,

问题 I have a Swift 2 project running on Xcode 7. I'm using CocoaPods (v 0.38.2 with use_frameworks! ) and have already managed to get those frameworks working: CryptoSwift Pluralize_swift Both Pods are written in Swift, so no problems so far. They work as charm. Now I'm trying to use SMPageControl which is written in Objective-C. I've seen it's possible to use Obj-C Pods with Swift 2, tried a lot of different combinations but I can't get it to work. SMPageControl class doesn't show on

问题 I have searched now all over the internet and I have tried almost everything. My current project is: I read the current coordinates from the User Location and save the latitude and longitude in CoreData and the name of this place(user can give a name) // MARK: - AddPlace Button Events @IBAction func onAddButton(sender: AnyObject) { //searching the current location let locCoord = CLLocationCoordinate2DMake(self.locationManager.location!.coordinate.latitude, self.locationManager.location!

问题 I have a protocol Reusable that has a static function static func reuseId() -> String and a protocol extension that defines the default implementation for the function. Then, I implemented a extension on UITableViewCell to conform to the Reusable protocol. I can now use the function on my TableViewCells without a problem: SomeTableViewCell.reuseId() . The Problem I have is with Generics. I have a generic class that has a generic parameter of the type UITableViewCell : internal class SomeClass

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . I have some data that has been compressed with the DEFLATE algorithm which I believe is basically just saying its zipped up. I'm writing a swift app and I was interested in figuring out if there is a native pure swift (2.0) implementation of the unzip algorithm. I need to implement this in a swift dynamic

问题 I want to write a custom code on double tap on UITextField and block the default text editing and popup of the keyboard. I've tried the following and nothing has worked for me so far. Kindly help me solve this problem. let gestureArray = NamTxtBoxVal.gestureRecognizers var tapGesture = UITapGestureRecognizer() for idxVar in gestureArray! { if let tapVar = idxVar as? UITapGestureRecognizer { if tapVar.numberOfTapsRequired == 2 { tapGesture = tapVar NamTxtBoxVal.removeGestureRecognizer