Subclassing vs Extension in swift -

-

i want customise 1 uitextfield reason. subclassed , added few methods.

instead of can use extension on uitextfield ? approach ? please explain !

as general rule of thumb (ymmv):

  • are adding general-purpose functionalities should available every uitextfield? if so, make extension. uitextfield instances can call new methods.
  • are adding functionality should restricted special instances of uitextfield identify precisely? if so, make subclass. instances of subclass can use new methods.

there other technical considerations, extensions can't add fields, instance.


Comments

Post a Comment

Popular posts from this blog

Android : Making Listview full screen -

-
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".mainactivity"> <edittext android:layout_margintop="5dp" android:layout_width="match_parent" android:layout_height="50dp" android:background="@drawable/location_edittext" android:id="@+id/locationeditext" android:textsize="15sp" android:textcolor="#999" android:paddingleft="15dp" /> <com.example.ravi_gupta.slider.viewpagercustomduration android:layout_width="wrap_content" android:layout_height="0dp" android:id="@+id/viewpager" android:scrollbarstyle="outsideoverlay" android:layout_weight="0.5&quo
Read more

javascript - Parse JSON from the body of the POST -

-
i'm using cameratag.com record video on website. service can send json response server can save data database. don't know how proceed here: the documentation states please note json repsonse passed in body of post , not form parameters. here example of how parse response in ruby: data = json.parse(request.raw_post) video_uuid = data["uuid"] but don't know how data on javascript. i'm not experienced in js please bare me :) post sample: { "uuid": "00012710-4b65-0131-ffe6-22000a499ea4", "camera_uuid": "98373a20-79ee-0130-3e42-1231390fcc11", "created_at": "2013-12-20t05:25:02.000z", "percent_complete": 100, "short_code": "kktb4q", "metadata": { }, "state": "published", "recorded_from": "http://singwho.com", "publish_type": null, "formats": [ { "name&qu
Read more

javascript - Chrome Extension: Interacting with iframe embedded within popup -

-
i writing chrome extension needs interact urls user not have open. therefore using hidden iframes embedded within popup, , attempting click button within iframe. however, receiving same origin policy error. know possible extension interact iframes of different domain via content scripts when iframe on tab user has open, not sure if possible use content scripts interact iframes directly in popup. here code: manifest.json "content_scripts": [ { "js": [ "bin/jquery.min.js", "interaction.js" ], "all_frames": true, "run_at": "document_start", "matches": [ "http://*/*", "https://*/*" ] }], "permissions": [ "activetab", "tabs", "http://*/", "https://*/" ], interaction.js $(document).ready(function() { $('div#iframes').append("<iframe id='shop' src=
Read more