ios - NSConstraint.constant checking its value after setting to avoid animating view again -

-

i have uitextfield (email) , uilabel (email error messages) - see image

enter image description here

when enter invalid email, animate in uilabel in changing constraint (linked iboutlet - default setting 22 in ib overridden in viewdidload 0) 0 22. works perfectly.

when enter valid email, reverse happens. works perfectly.

i'm having trouble finding way not animate uilabel in even if there code below:

   self.usernameerrormessage.text = @"invalid email";      nslog(@"before constant: %f", self.emailerrormessagelabelheightconstraint.constant);     nslog(@"before email textfield height: %f", self.usernameerrormessage.bounds.size.height);      if (self.emailerrormessagelabelheightconstraint.constant != 22) {          self.emailerrormessagelabelheightconstraint.constant = 22;         [self.view setneedsupdateconstraints];          [self.view layoutifneeded];         [uiview animatewithduration:0.5 animations:^{              nslog(@"after constant: %f", self.emailerrormessagelabelheightconstraint.constant);             nslog(@"after email textfield height: %f", self.usernameerrormessage.bounds.size.height);              [self.view layoutifneeded];         }];     }

output of nslog after running first time & entering invalid email

2014-03-19 14:10:44.085 login[21743:60b] before constant: 0.000000 2014-03-19 14:10:44.086 login[21743:60b] before email textfield height: 0.000000 2014-03-19 14:10:47.341 login[21743:60b] after constant: 22.000000 2014-03-19 14:10:47.341 login[21743:60b] after email textfield height: 22.000000

clicking textfield run code above again (this time expect animation not happen since error message uilabel showing... animates in since constant when checked in if statement 0.000000 still...

output of second run

2014-03-19 14:15:01.074 login[21743:60b] before constant: 0.000000 2014-03-19 14:15:01.074 login[21743:60b] before email textfield height: 0.000000 2014-03-19 14:15:01.865 login[21743:60b] after constant: 22.000000 2014-03-19 14:15:01.866 login[21743:60b] after email textfield height: 22.000000


Comments

Post a Comment

Popular posts from this blog

java - WrongTypeOfReturnValue exception thrown when unit testing using mockito -

-
my test list<person> mylist; @test public void testisvalidperson() { mylist = new arraylist<person>(); mylist.add(new person("tom")); when(persondao.get(person)).thenreturn(mylist); when((persondao.get(person)).isempty()).thenreturn(false);//------exception thrown boolean result = service.isvalid("tom"); assertfalse(result); } method tested: public boolean isvalid(string person){ persondao = new persondao(); person personobj = new person(person); return (persondao.get(person).isempty())?false : true; } exception thrown: org.mockito.exceptions.misusing.wrongtypeofreturnvalue: boolean cannot returned get() get() should return list *** if you're unsure why you're getting above error read on. due nature of syntax above problem might occur because: 1. exception *might* occur in wrongly written multi-threaded tests. please refer mockito faq on limitations of concurrency testing. 2. sp
Read more

php - Magento - Deleted Base url key -

-
i working on cleaning url: http://mydomain.com/shop/shop/deals i going through settings in configuration tab in admin panel on magento , change secure , unsecure base urls remove first base url "shop" web page read: http://mydomain.com/shop/deals so changed unsecure base urls mydomain.com/shop mydomain.com , secure 12.345.67.89/shop 12.345.67.89. wrong thing do. i cannot reload page or admin console. how access these files through ftp , change correctly there?? when make changes in admin panel changes made in database not in file. have make changes in database. 1.go database , select core_config_data table under table find web/unsecure/base_url , web/secure/base_url . make changes here. don't forget clear cache in var/cache folder
Read more

android - How to disable Button if EditText is empty ? -

-
i have edittext , button in application. when button clicked,the text entered in edittext added listview. i want disable button if edittext empty.how ? this code button click imagebutton imb=(imagebutton)findviewbyid(r.id.btn_send); imb.setonclicklistener(new onclicklistener() { @override public void onclick(view arg0) { edittext et = (edittext)findviewbyid(r.id.edittext1); string str = et.gettext().tostring(); web1.add(str); toast.maketext(shoutsingleprogram.this, "you entered...."+str, toast.length_short).show(); adapter1.notifydatasetchanged(); et.settext(""); } }); } how can ? edittext1.addtextchangedlistener(new textwatcher() { @override public void ontextchanged(charsequence s, int start, int before, in
Read more