protocols

问题 the question is as follows: if you take a look at any site using addthis (the share button)... once you float over the addthis button, and all of the required assets load take a look at the body of the document using firebug or chrome inspector (not the source, the actual document that is sitting on your screen... the object inspector). you will notice that the additional assets loaded automatically by addthis look something like this: <script type="text/javascript" src="//s7.addthis.com

问题 I have two collection views within a ViewController. One Collection view represents the tab bar at the top, the other represents pages on the bottom half of the screen. I have the second UICollectionView (on the bottom half) within a custom UIView (loading from another class). My objective is to have when I click on the tab bar, to move the bottom collectionView accordingly, with regards to the scrollToIndex. My issue is that when I click on the tab bar at the top, and call the function that

问题 I have two view controller, ParentViewController have label that updated using SecondViewController . Now I want to change ParentViewController 's label text color from ChildViewController , for that i am using protocol and delegate but it shows error. My code is like this: ChildViewController.h @protocol ViewControllerDelegate -(void) updateLabel; @end @interface ChildViewController : UIViewController<UITextFieldDelegate,UITextViewDelegate> { id <ViewControllerDelegate> delegate; } @property

问题 I have a UIViewController on a UINavigationStack and from this UIView I load another view not onto the stack but as a subview. This view that I load is just a preferences view for the app that I overlay onto what ever is showing. i.e. myViewController <- on the stack button touch loads as a subview to myViewController + prefrencesViewController My question is, is there a way to call a method thats in myViewController from prefrencesViewController? I am trying to use delegates and protocols

问题 Could anyone explain me why "If modified-Since" doesn't work in my http client...? I check what I send in httpbin.org: { "url": "http://www.httpbin.org/get", "headers": { "Content-Length": "", "Connection": "keep-alive", "Accept": "*/*", "Host": "www.httpbin.org", "If-Modified-Since": "Mon, 12 Nov 2012 18:00:00 GMT", "Content-Type": "" }, "args": { }, "origin": "89.70.183.105" } But I still get every file. "If-modified-since" simply doesn't work. Maybe it's not implemented in servers? If so,

问题 I'm in the process of writing a client/server application which should work message based. I would like re-use as much as possible instead of writing another implementation and curious what others are using. Features the library should offer: client and server side functionality should work message based support multi-threading should work behind load balancer / firewalls I did several tests with HTTPCore, but the bottom line is that one has to implement both client and server, only the

问题 I'm trying to implement the delegation pattern on Swift. The process consists in a popover that is displayed from a UIMenuItem in a text selection on a textView. This popover is a TableViewController that contains some colors. When a cell (or color) is tapped, the selected text changes its color from black to the selected color. I have the following protocol in the sending class: protocol SelectedColorDelegate { func didSelectColorCell(color: UIColor) } Then in the sending class I created

问题 I'm trying to implement the delegation pattern on Swift. The process consists in a popover that is displayed from a UIMenuItem in a text selection on a textView. This popover is a TableViewController that contains some colors. When a cell (or color) is tapped, the selected text changes its color from black to the selected color. I have the following protocol in the sending class: protocol SelectedColorDelegate { func didSelectColorCell(color: UIColor) } Then in the sending class I created

问题 I'm trying to use generics in swift in order to initialise variables within my Vector3D class. However, upon assigning the protocol 'Number' to my variable (to make it either a Double or Float) I get the following error: Protocol 'Number' can only be used as a generic constraint because it has Self or associated type requirements public protocol Number { func +(l: Self, r: Self) -> Self } extension Double : Number {} extension Float : Number {} class Vector3D: NSObject { var xCord: Number var

问题 I must produce a parsing automat of SPDH protocol. SPDH defines the structure of request and response messages exchanged between an electronic payment terminal and the server of the bank. The specifications of this protocol are described in this document: http://www.trauco.com/docs/SPDH-specification_070212.pdf I specified the following grammar for this protocol: Frame : = header fids etx ; header : = fields ; fields : = field fields | epsilon ; field : = string | number ; fids : = fid