ios - Objective-C UIKit UIAlertViewDelegate not called -

-

i begin learn objective-c uikit , ran problem.uialertviewdelegate not called.can tell me why? thank you! 

#import <foundation/foundation.h> #import <uikit/uikit.h> @interface alertlearn : nsobject <uialertviewdelegate> -(void) showalerttest; - (void)alertview:(uialertview *)alertview clickedbuttonatindex:(nsinteger)buttonindex; @end  #import "alertlearn.h" #import <uikit/uikit.h>  @implementation alertlearn  -(void) showalerttest{     uialertview * alertview = [[uialertview alloc] initwithtitle:@"alert" message:@"alert test" delegate:self cancelbuttontitle:@"cancel" otherbuttontitles:@"ok", nil];     [alertview show];  } - (void)alertview:(uialertview *)alertview clickedbuttonatindex:(nsinteger)buttonindex{      nslog(@"clickedbuttonatindex = %ld",buttonindex );     nsstring *buttontitle = [alertview buttontitleatindex:buttonindex];     nslog(@"clickedbuttonatindex title = %@",buttontitle); } @end

this because assigning alert view in stricter life span should be, try making alert ivar or property , try again. 

@interface alertlearn : nsobject <uialertviewdelegate> { uialertview * alertview; } -(void) showalerttest; - (void)alertview:(uialertview *)alertview clickedbuttonatindex:(nsinteger)buttonindex; @end ... -(void) showalerttest{     alertview = [[uialertview alloc] initwithtitle:@"alert" message:@"alert test" delegate:self cancelbuttontitle:@"cancel" otherbuttontitles:@"ok", nil];     [alertview show];  }

and remove definition showalerttest method.

p.s.: please note type of showing alert view deprecated of ios 8, should use uialertcontroller instead, if reason need support ios 7 , below, well, should make strong pointer alert.


Comments

Post a Comment

Popular posts from this blog

php - Invalid Cofiguration - yii\base\InvalidConfigException - Yii2 -

-
Image
i've installed yii2-user module/dektrium yii2-app-basic application command composer require "dektrium/yii2-user:0.9.*@dev" config/console.php return [ . . 'modules' => [ 'gii' => 'yii\gii\module', 'user' => [ 'class' => 'dektrium\user\module', ], ], . . ] config/web.php 'components' => [ . . /* 'user' => [ 'identityclass' => 'app\models\user', 'enableautologin' => true, ], */ 'modules' => [ 'user' => [ 'class' => 'dektrium\user\module', ], ], . . ] after that, run command $ php yii migrate/up --migrationpath=@vendor/dektrium/yii2-user/migrations updating database schema . but, when run http://localhost/mylawsuit/yii/web/index.php?r=u
Read more

How to show in django cms breadcrumbs full path? -

-
need advice - how show in breadcrumbs whole path article or page? i've got code: {% ance in ancestors %} <li> {% if not forloop.last %} <a href="{{ ance.get_absolute_url }}">{{ ance.get_menu_title }}</a> {% else %} <span class="active">{{ ance.get_menu_title }}</span> {% endif %} </li> {% endfor %} but shows "home" , current page. how modify show whole path in breadcrumbs? i've found in file menu_tags.py code calls ancestors. @ least there class showbreadcrumbs: class showbreadcrumb(inclusiontag): """ shows breadcrumb node has same url current request - start level: after level should breadcrumb start? 0=home - template: template used render breadcrumb """ name = 'show_breadcrumb' template = 'menu/dummy.html' options = options( argument('start_level', default=0, require
Read more

ruby on rails - npm error: tunneling socket could not be established, cause=connect ETIMEDOUT -

-
i have app uses rails framework , implements angularjs part of front end. i have pushed heroku , have heroku toolbelt installed, when try migrate db using "heroku run rake db:migrate" receive following error(s): installing core plugins heroku-cli-addons, heroku-apps, heroku-fork, heroku-git, heroku-local, heroku-run, heroku-status... error installing package. try running again gode_debug=info see more output. ! `run` not heroku command. ! perhaps meant `-h`, `2fa`, `auth`, `join`, `open`, `orgs`, `pg`, `ps` or `rake`. ! see `heroku help` list of available commands. i run command "gode_debug=info heroku run rake db:migrate" , receive error: npm err! darwin 14.5.0 npm err! argv "/users/christopher_pelnar/.heroku/node-v4.2.1-darwin-x64/bin/node" "/users/christopher_pelnar/.heroku/node-v4.2.1-darwin-x64/lib/node_modules/npm/cli.js" "install" "heroku-cli-addons" "heroku-apps" "heroku-fork
Read more