ios - How UIViewController interact with Storyboard under the hood -

-

i'm new ios development , stupid question experienced guys...

when create new ios project in xcode, viewcontroller class , storyboard sets custom class viewcontroller. looks there "storyboard" class holding instance of viewcontroller, however, cannot find "storyboard" class defined.

even though know how create multiple subclasses of uiviewcontroller handle different views interaction following tutorials, still find uncomfortable associate these subclasses storyboard selecting them in storyboard panel. rather see "storyboard" class holding array of uiviewcontroller.

so question is, how these uiviewcontroller interact storyboard under hood?

thanks

roughly, happens follows:

  1. app launches.
  2. app loads storryboard.
  3. depending on app's navigation structure, app instantiates each view controller inside storyboard needed.

the storyboard contains detailed information on:

  • which custom subclass of uiviewcontroller, uinavigtioncontroller, etc. use instantiating each view controller in storyboard.

  • how map (connect) each if view controllers' subviews corresponding custom classes' outlets , actions.

but seriously, read apple's docs. it's there.


Comments

Post a Comment

Popular posts from this blog

multithreading - Exception in Application constructor -

-
i wanna write snake game javafx , there exception don't know , want know how fix it. ( know it's not complete yet ) and want know , class extends application ( start override ) main in other programs? see , here not static void main bc didn't need, if want add main shoud do? it's exeption... exception in application constructor exception in thread "main" java.lang.nosuchmethodexception: main_snake.main([ljava.lang.string;) @ java.lang.class.getmethod(class.java:1819) @ com.intellij.rt.execution.application.appmain.main(appmain.java:125) and code : import javafx.animation.animationtimer; import javafx.application.application; import javafx.event.eventhandler; import javafx.scene.scene; import javafx.scene.canvas.canvas; import javafx.scene.canvas.graphicscontext; import javafx.scene.input.keyevent; import javafx.scene.layout.borderpane; import javafx.scene.paint.color; import javafx.stage.stage; import java.util.arraylist; /** * creat...
Read more

React Native allow user to reorder elements in a scrollview list -

-
i'm trying let user reorder elements in scrollview list long-pressing on 1 of elements. we're trying let user use long press pick element of scrollview list, , put element somewhere else in list. have working using animated view, issue it's difficult integrate scrolling , swipe-to-delete animated view. we're hoping add "pick , reorder" scrollview. is there preferred method accomplishing this? touchablewithoutfeedback has onlongpress method, can implement this: _onlongpress() { // perform sort }, <touchablewithoutfeedback onlongpress={ () => this._onlongpress() }> <text>click , hold call onlongpress</text> </touchablewithoutfeedback> as far sorting, can use type of library such lodash or underscore, plus there ways sort using vanilla javascript. check out this thread. i've set basic project using sort function on listview here . https://rnplay.org/apps/mpbktg 'use strict'; var react = requ...
Read more

windows - CertCreateCertificateContext returns CRYPT_E_ASN1_BADTAG / 8009310b -

-
i realize similar post others (e.g. this one ), there details missing posts might significant case. to start with, here's simplified program: #include "stdafx.h" #include <windows.h> #include <wincrypt.h> int _tmain(int argc, _tchar* argv[]) { // usage: certextract certpath char keyfile[] = "c:\\certificates\\public.crt"; byte lp[65536]; security_attributes sa; handle hkeyfile; dword bytes; pccert_context certcontext; sa.nlength = sizeof(sa); sa.lpsecuritydescriptor = null; sa.binherithandle = false; hkeyfile = createfile(keyfile, generic_read, file_share_read, &sa, open_existing, file_attribute_normal, null); if (hkeyfile) { if (readfile(hkeyfile, lp, getfilesize(hkeyfile, null), &bytes, null) && bytes > 0) { certcontext = certcreatecertificatecontext(x509_asn_encoding, lp, bytes); if (certcontext) { printf("yay...
Read more