ios - UIPageViewController displays pages out of order and never calls viewControllerBeforeViewController -


i have uipageviewcontroller , implemented 2 optional methods on data source automatic uipagecontrol.

i have following helper methods convert between indices , view controllers.

- (uiviewcontroller *)viewcontrollerforindex:(nsinteger)index; - (nsinteger)indexfromviewcontroller:(uiviewcontroller *)viewcontroller;

the first method creates new view controller, configures specific index, , stores index in retrievable location (i.e. 1 accessed second method).

i instantiate page view controller following code:

[pageviewcontroller setviewcontrollers:@[[self viewcontrollerforindex:0]]                              direction:uipageviewcontrollernavigationdirectionforward                               animated:no                             completion:nil];

and here data source methods:

- (uiviewcontroller *)pageviewcontroller:(uipageviewcontroller *)pageviewcontroller viewcontrollerbeforeviewcontroller:(uiviewcontroller *)viewcontroller {     nsinteger currentindex = [self indexfromviewcontroller:viewcontroller];     if (currentindex == 0) {         return nil;     } else {         return [self viewcontrollerforindex:currentindex-1];     } }  - (uiviewcontroller *)pageviewcontroller:(uipageviewcontroller *)pageviewcontroller viewcontrollerafterviewcontroller:(uiviewcontroller *)viewcontroller {     nsinteger currentindex = [self indexfromviewcontroller:viewcontroller];     if (currentindex == self.data.count - 1) {         return nil;     } else {         return [self viewcontrollerforindex:currentindex+1];     } }  - (nsinteger)presentationcountforpageviewcontroller:(uipageviewcontroller *)pageviewcontroller {     return self.data.count; }  - (nsinteger)presentationindexforpageviewcontroller:(uipageviewcontroller *)pageviewcontroller {     return 0; }

when navigate forward, works properly, when navigate backwards, view controllers start appear in random order.

i believe related fact pageviewcontroller:viewcontrollerbeforeviewcontroller: never called. page view controller calls pageviewcontroller:viewcontrollerafterviewcontroller:, when begin swiping backwards.

the uipageviewcontroller configured in storyboard follows:

  • navigation: horizontal
  • transition style: scroll
  • spine location: none
  • double sided: no

how can page view controller show view controllers in proper order?

update: when copy code brand new project, works perfectly. guess new question know of pods, frameworks, linker flags, other settings might causing behavior?

if present same page view controller on top of current page view controller recursively, bug happens on every odd version of view controller. (i.e. happens on first one, third one, etc.)

it taplytics.

i running version 1.2.34, after updating 1.2.50, fixed problem.


Comments

Post a Comment

Popular posts from this blog

commonjs - How to write a typescript definition file for a node module that exports a function? -

consider, toml node module can use: // toml.d.ts declare module toml { export function parse(value:string):any; } declare module "toml" { export = toml; } then: /// <reference path="../../../../../defs/toml/toml.d.ts"/> import toml = require('toml'); toml.parse(...); however, node module export single function, such 'glob' ( https://github.com/isaacs/node-glob ). the node usage of module be: var glob = require("glob") glob("*.js", {}, callback(err, files) { ... }); you'd naively expect this: // glob.d.ts declare function globs(paths:string, options:any, callback:{(err:any, files:string[]):void; ...but because typescripts 'import' semantics bit strange, seems can use 'import .. = require()' statement alias modules . trying call: /// <reference path="../../../../../defs/glob/glob.d.ts"/> import blog = require('glob'); results in: error ts2072: mod...
Read more

openid - Okta: Failed to get authorization code through API call -

i'm integrating okta own idp server using okta's api. i'm implementing authorization code flow following steps below: in own server, use /api/v1/authn endpoint sessiontoken. use sessiontoken obtain authorization calling endpoint: /oauth2/v1/authorize?client_id=" + clientid + "&sessiontoken=" + sessiontoken + "&response_type=code&response_mode=query&scope=openid&redirect_uri=" + redirecturl + "&state=evanyang&nonce=" it's supposed return response status code 302 , location header containing redirect url code value. however, keep getting response status code 200 , without location header, html body saying "you using unsupported browser." , "javascript disabled on browser." according api documentation: http://developer.okta.com/docs/api/resources/oidc.html#authentication-request , sessiontoken parameter sufficient this: an okta one-time sessiontoken. allows api-based ...
Read more

ios - Change Storyboard View using Seague -

i have following code checks connection server, , depending on want change views if no connection found. nsstring *connect = [nsstring stringwithcontentsofurl:[nsurl urlwithstring:@"http://myserver.com"] encoding:nsutf8stringencoding error:nil]; if (connect == null) { [self performseguewithidentifier:@"network_failure" sender:self]; } else { // other code here } my problem not change views. have added storyboard segue between 2 views identifier of network_failure . not have navigation controller or that, problem? thanks help! no not problem. first of all, in objectivec exists nil object oriented null . must use that. so: if(connect == nil) or better: if(!connect) so due fact nil not same of null , probably code does't enter in if scope . you have been able discover breakpoint. anyway: be sure set trigger segue (line) 2 view controller , , name network_failure (that not best name. should instead view1toview2 ) as, m...
Read more