initialization - The correct way to override an initializer in Swift 1.1 -

-

itemprop = "text">

It used to work in Xcode 6.1 Beta: 

  class MainViewController: NSViewController {feature override Init () {self.init (nibName: "MainView", bundle: nil)}} I do not compile it after switching to 6.1 GM2. It seems that this issue has been introduced in Swift 1.1. I have tried  feature override init? () ,  feature init? ()  and  override init? () , neither worked.  
 So what is the correct way to override such starters today?   
 
 
 is trying to implement  init ()  a non -Functional initial  init? (NibName: bundle :) , which is a fuses introduction does not work: If the  super.init  call fails, you leave it with a non-preliminary example Will not allow Swift.  
 Or is it another way, the result of using a Fizla Starter is an alternative, and you can not use a non-alternative value instead of alternative options. And in the case of Class Initialization and Inheritance, you can not change the option of a non-optional  self  option. You can only set up the status of  self  in a different initializer.  
 Instead, you can remove option / failure with short song and dance:  <> Code> class MainViewController pre: NSViewController {Override init (nibName nibNameOrNil: string ?, bundle) nibBundleOrNil: NSBundle) {super.init (nibName: nibNameOrNil, bundle: nibBundleOrNil) here check the state and provide // application-specific diagnosis if this is incorrect} feature override init () {self.init (nibName: "MainView" , Bundle: zero)} // need this, too, or the compiler complains that it is missing the init necessary (coder: NSCoder)? {FatalError ("not implemented") // ... or actual execution}}   
 a  init!  initializer produces an unbound unwrapped alternative (IUO) one ?? ?? As an IUO type can be used to bridge the code that works with optional and non-optional values, a  init!  initializer Fusible and non-you can not delegate Fusion Starters to a non-filing initiator, but you can not get a  init!  initializer and  init! From  to a fuzzy launcher initiator  
 Here,  NSViewController  is the beginner you want to use, is completely fuzzy so you can call it  init!  Override with Starter. Then, you can declare a non-fusible  feature int  that your new  init!  Representative of initializer  
 
 We often avoid IUo, and in detail  init!  initializers, because we generally want to expressly express or disallow it for clearly or failure. However, one of the most common general usage cases for IUO and their relatives is to turn on conditions that guarantee that only your source code can guarantee that your code behaves accurately.  IBOutlet  s is the best example of this ???? You guarantee the status of your  IBOutlet  variable in your Nib / Storyboard, but the compiler does not know about that? As there is something else to do with bundled resources  
 This small delegation dances into your code the burden of failure at a specific, easily debugable place. If your app fails from  init ()  to  super.init (nibName: bundle :) , your app will crash but you can expect that the call is only too Expect to fail in specific (and most development-time) situations.

Comments

Post a Comment

Popular posts from this blog

php - PDO bindParam() fatal error -

-
I am trying to learn PDO, now I have written this small code, but it gives me a serious error: < P> Fatal error: Call a member function at a non-object dot () ... $ con = new mysqli ("127.0.0.1", "root", "", "csvdangercheck"); $ Query = $ con- & gt; ("Id,` var1`, `var2`) values ​​(" id,: var1,: var2) ";); $ query- & gt; bypass pattern (': id', $ id); $ query- & gt; BindParam (': var1', $ VAL1); $ Query- & gt; bindParam (': var2', $ val2); $ Query-> Executed (); I Trying to use print_r ($ con-> errorInfo ()) but Fatal error: Undefined method mysqli :: errorInfo ( ) ... can someone tell me what am I missing? Flaffeh said, you have PDO Missing Mysqy, try it: $ con = new PDO ('mysql: host = 127.0.0.1; dbname = csvdangercheck', 'root', '');
Read more

logging - How can I log both the Request.InputStream and Response.OutputStream traffic in my ASP.NET MVC3 Application for specific Actions? -

-
For a specific set of tasks, I need to log in to the incoming request inputstream as well as outgoing response. is. I am using an ActionFilterAttribute for this and overriding the OnActionExecuted and OnResultExecuted methods. So I'm starting with this idea ... Public category ActionLoggerAttribute: ActionFilterArrbit {Public Override Zero On-Offed Execution (ActionActioned Contact Filter Filter) {base.OnActionAxecuted (FilterContext); HttpRequestBase request = filterContext.HttpContext.Request; // TODO: Log the request. InputStream} Public Override Zero OnResultExecuted (ResultExecutedContext FilterContext) {base.OnResultExecuted (filterContext); HTTPRPSPointBase Response = FilterContacts Hpptex response; // TODO: Log on Response.OutputStream}} Ideally I'll hook it up with enterprise library logging because I'm already using it for error logging. Am I reaching the input and output stream at the right time? Can I easily use the Enterprise Library to log i
Read more

java - Why my included JSP file won't get processed correctly? -

-
I am trying to create Java web framework (and learning), and on the basis of 'Code Generator In the process of making the material view of the database in the process of development, I stumbled into a difficulty, which I do not know how to solve it. First of all, I want the following index.jsp : & lt; Body & gt; Use all pages to be created. & Lt;% @ include file = "header.jsp"% & gt; & Lt; Hours / & gt; & Lt;% @ included file = "body.jsp"%> & Lt; Hours / & gt; & Lt;% @ include file = "footer.jsp"% & gt; & Lt; / Body & gt; And, in body.jsp , I should have it like this: & lt; Jsp: include page = "$ {Application_modul}"%> Where application_modul is an attribute defined in its controller: request.setAttribute ("application_modul", "USER_ACCOUNT \\ ' View_user_account.jsp "); This file can be found properly, but the processed JSP does
Read more