ios - Delegation pattern in Obj-C - Am I doing it wrong? -

-

so in app have following situation:

backendcommunicatingclass -> (owned by) -> modelclass -> (owned by) -> homescreenviewcontroller

  • homescreenviewcontroller delegate modelclass.
  • modelclass delegate backendcommunicatingclass.

also on when app launches first time, have this:

welcomeviewcontroller -> (owned by) -> homescreenviewcontroller

  • homescreenviewcontroller delegate welcomeviewcontroller.

when user types username , password in welcomeviewcontroller, information needs way backendcommunicatingclass, , way welcomeviewcontroller display error if needed. right have implemented passing information each class in communication chain, until gets backendcommunicatingclass. result lot of duplication of protocol methods , feel i'm doing wrong.

what think?

well understand not clearest solution, without seing code, , purpose of program, suggest.

  • implement key value observing (kvo) in end view controller, observing change in home view controller. end controller detect change in text field, trough dedicated variable in home view controller, fires operation has do.
  • when end finish, sends nsnotification result of operation. home view controller have made listening such custom notification, react , display error message or other staff.

it may sounds complicated, kvo , notification easy implement, , there plenty of docs , tutorial on net.


Comments

Post a Comment

Popular posts from this blog

c++ - Creating new partition disk winapi -

-
i'am trying create new partition , mount volume new, thought createfile let me this, code : lpctstr lpfilename=l"\\\\.\\device\\harddisk0\\partition3"; handle handl=createfile( lpfilename, generic_read | generic_write, file_share_read | file_share_write, null, create_always, file_attribute_normal, null ); if (handl==invalid_handle_value) { qdebug()<<"handl invalid"<<" error"<<getlasterror();} bool success = definedosdevice(ddd_raw_target_path,l"i:",l"\\device\\harddisk0\\partition3"); if(!success) qdebug()<<" definedosdevice failed "<<getlasterror(); bflag = getvolumenameforvolumemountpoint( l"i:\\", // input volume mount point or directory /** u in dir
Read more

Android Prevent Bluetooth Pairing Dialog -

-
i'm developing internal application uses bluetooth printing. want bluetooth pairing occur without user input. have managed working trapping android.bluetooth.device.action.pairing_request broadcast. in broadcast receiver call setpin method, , pairing works ok, bluetoothpairingdialog displayed second or two, disappears - see link below. https://github.com/android/platform_packages_apps_settings/blob/master/src/com/android/settings/bluetooth/bluetoothpairingdialog.java since broadcast non-ordered, can't call abortbroadcast() , , wondering if there other way prevent pairing dialog appearing. can hook window manager in way? i haven't been able come way without modifying sdk. if you're oem, it's easy (i'm on 4.3): in packages/apps/settings/androidmanifest.xml, comment intent filter pairing dialog: <activity android:name=".bluetooth.bluetoothpairingdialog" android:label="@string/bluetooth_pairing_request"
Read more

php - joomla get content in onBeforeCompileHead function -

-
i'm developing joomla system plugin. need add javascript , css files if [myshortcode] shortcode found in content. how can content in onbeforecompilehead function function onbeforecompilehead() { $document = jfactory::getdocument(); //add scripts if shortcode found ... $document->addstylesheet($cssfile, 'text/css', null, array()); the $content = jresponse::getbody(); not work. thanks try this, for style sheet, $document = jfactory::getdocument(); $document->addstylesheet('http://domain.com/templates/css/style.css'); for javascript file $document = jfactory::getdocument(); $document->addscript('full url'); also can this, $document = jfactory::getdocument(); // add javascript $document->addscriptdeclaration(' window.event("domready", function() { alert("an inline javascript declaration"); }); '); // add styles $style = 'body {'
Read more