objective c - Switching between 3 pages with segmentend button requires 2 taps? -


here setup :

home page, profile page, friends page.

in each page, there exact same segmentend button : [home | profile | friends]

when tap on segment, segue called , page changed.

so, when i'm in profile, profile selected, , can tap on either home or friends ; when do, new page loaded, new segment selected , can again if want to.

in storyboard, have 3 pages " ton " of custom segue (i used custom animation purposes).

in code, have : 

(void)movetopage {     if ([self.pageswitch selectedsegmentindex] == 1)     {          [self performseguewithidentifier:@"fromhometoprofile" sender:self];;     }     if ([self.pageswitch selectedsegmentindex] == 2)     {          [self performseguewithidentifier:@"fromhometofriends" sender:self];;     }  }   - (ibaction)pageswitchbutton:(id)sender {     [self.pageswitch addtarget:self                            action:@selector(movetopage)                  forcontrolevents:uicontroleventvaluechanged]; }

the names self explanatory.

my problem (we're getting it) : when tap on segment, becomes selected, nothing happens first time. if tap new segment (that not 1 current page), works fine. basically, first tap ignored, second 1 works. have tap page, , tap isn't same work.

any idea? i'm kind of stuck unique problem :d

okay found ; didn't understand how addtarget:action:forcontrolevents works.

we need put the

[self.pageswitch addtarget:self                            action:@selector(movetopage)                  forcontrolevents:uicontroleventvaluechanged];

in viewdidload , works fine. has put in 3 pages.

here explanation got irl, feel free comment/add stuff if i'm wrong :

the addtarget:action:forcontrolevents: method behaviour page has. " when happens, ". because in action, page learned behaviour when clicked first time, , knew how react afterwards. page know first time, has learn behaviour @ earliest stage of creation, hence in viewdidload.

because there nothing left in action, can remove completly , remove links in storyboard. need outlet , movetopage method work.

i hope helps :)


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