swift2

问题 I am switching over the syntax of my project toward Swift 2.2 (which xCode helps me do automatically); however, I do not understand the new #selector() syntax. As an example: timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: #selector(MyVC.timerCalled(_:)), //new selector syntax! userInfo: nil, repeats: true) This has the selector #selector(MyVC.timerCalled(_:)) What does the _: signify? Can you add other variables into this selector? Say, #MyVC.timerCalled(_

问题 I am studying Swift! I want create Main interface on xib. But have error "use of unresolved identifier". Add code from MainViewController import Foundation public class MainViewController : BaseViewController { override func viewWillAppear(animated: Bool) { super.viewWillAppear(animated) // TODO: Write your test code here // ... } } UPD:(Add image) 回答1: 1) Right Click your MainViewController.swift 2) Select Show File Inspector 3) On Right side panel, look at Target Membership 4) Add your

问题 I am creating a trivia application that asks for a username on start up. I'd like to make it impossible to use characters such as #$@!^& etc (also including "space"). I took a look at this post here but it is written entirely in Objective-C. Thanks in advance. 回答1: Since you're explicitly asking for Swift, I've translated the top asnwer in the linked question. let notAllowedCharacters = " ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_."; func textField( textField: UITextField

问题 I have been using this code to perform a custom segue when a user logs in to the application: dispatch_async(dispatch_get_main_queue()){ self.performSegueWithIdentifier("showSTPS", sender: self) } I currently have this code in my perpareForSegue (im not totally sure if i need it) override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?){ if "showSTPS" == segue.identifier { } } And I am getting the following error every time I try to perform the segue: 2015-08-31 11:56:28.998

问题 In a following class class Foo { let _defaultValue = "N/A" let value: String init (dict: NSDictionary) { self.value = dict["bar"] as? String! ?? _defaultValue } } compiler fails with the message constant 'self.value' captured by a closure before being initialized As far as I can see, no operators read `self.value. The message seems somewhat confusing. I accidentally came up with a workaround. I should say it confuses me even more: class Foo { let value: String init (dict: NSDictionary) { let

问题 This question already has answers here : How to initialize properties that depend on each other (4 answers) Closed 4 years ago . I have the following code and I'm confused about this error message: Instance member 'mydate' cannot be used on type 'TableViewController' Code: class TableViewController: UITableViewController { let mydate = NSDate() let items = [ (1, 9, 7, "A", mydate), (2, 9, 7, "B", mydate), (3, 9, 7, "C", mydate), (4, 9, 7, "D", mydate) ] When I write the following, I can build

问题 How to list all classes implementing a given protocol in Swift? Say we have an example: protocol Animal { func speak() } class Cat:Animal { func speak() { print("meow") } } class Dog: Animal { func speak() { print("Av Av!") } } class Horse: Animal { func speak() { print("Hurrrr") } } Here is my current (not compilable) approach: func getClassesImplementingProtocol(p: Protocol) -> [AnyClass] { let classes = objc_getClassList() var ret = [AnyClass]() for cls in classes { if class

问题 I am trying to create a dictionary extension where Dictionary is of the type <String, AnyObject>. Was looking in many places and trying different approaches, but none of them seemed to work. This was one of them: extension Dictionary where <String, AnyObject>{ var jsonString:String { return "" } } Another method that didn't actually work for some reason: extension Dictionary where Key:Hashable, Value:AnyObject { var jsonString:String { do { let stringData = try NSJSONSerialization

问题 I'm using some external codes from google in my new Swift 2.0 project that required "libz.dylib" in earlier versions. After updating to the new XCode / the new SDK. XCode is now unable to import the libz.dylib and throws some errors Undefined symbols for architecture i386: "_deflate", referenced from: +[GAICompressionUtil gai_dataByCompressingBytes:length:compressionLevel:mode:] in libGoogleAnalyticsServices.a(GAICompressionUtil.o) "_deflateEnd", referenced from: +[GAICompressionUtil gai

问题 I have a piece of code which is generating lots of warnings (deprecated API) Using clang* I could do #pragma clang diagnostic push #pragma clang diagnostic ignored "-Wdeprecated-declarations" ... #pragma clang diagnostic pop However this does not work in swift. How to do it in swift ? Note: I don't want to disable the warning globally, nor even file wide, but just disable a specific warning in a specific part of my source code. Edit: I looks like my note was not clear enough: I do NOT want