ios - Is UICollectionView.backgroundView broken -

-

i'm writing relatively simple, or thought.

firstly, code, i'm trying place image on background of uicollectionview if there no results returned server. image 200 200:

uiview *myview = [[uiview alloc] initwithframe:self.view.bounds]; cgrect myviewspace = self.view.bounds; cgfloat myx = (myviewspace.size.width /2.0) - 100; cgfloat myy = (myviewspace.size.height /2.0) - 100; uiimageview *imview = [[uiimageview alloc] initwithframe:cgrectmake(myx, myy, 200, 200)]; imview.image = [uiimage imagenamed:@"imnothome"]; [myview addsubview:imview]; mycollectionview.backgroundview = myview;

once there results, want able remove it.

i thought it'd simple placing following, before reloaded uicollectionview:

[mycollectionview.backgroundview removefromsuperview];

however, appears doing nothing.

am missing something?

thanks in advance!

it should done way instead:

mycollectionview.backgroundview = nil;

explanation: should unset uicollectionview's background in same way set it. didn't set manipulating view hierarchy, setting background property. did call addsubview in previous line, add subview background view, not add background view itself.

edit:

there article uicollectionview bug here: http://blog.spacemanlabs.com/2013/11/uicollectionviews-backgroundview-property-is-horribly-broken/

the solution author gives reset background empty opaque view:

uiview *blankview = [uiview new]; blankview.backgroundcolor = [uicolor whitecolor]; [mycollectionview.backgroundview removefromsuperview]; mycollectionview.backgroundview = blankview;

also, author recommends not using backgroundview property @ doing yourself:

frankly, think best solution ignore backgroundview property together. instead, make collection view’s background clear, , implement own backgroundview; throw view behind collection view.


Comments

Post a Comment

Popular posts from this blog

windows - Single EXE to Install Python Standalone Executable for Easy Distribution -

-
i used pyinstaller create standalone exe file pyqt project. did not use single file option because exe created single file option takes long open. therefore, pyinstaller created dist folder contains bunch of files including program.exe file. create setup.exe file place contents of dist folder in program directory , create shortcut in start menu , on desktop. want super simple user. maybe setup.exe files when download program cnet. found inno-setup, looks promising. however, not know if there special considerations because program standalone program create python/pyqt program. thanks! have experience task? there program using task not know about? inno-setup or nsis easiest use. tell them files include , put them , create nice installer you. wrote short tutorial on experiences using innosetup might find helpful: http://www.blog.pythonlibrary.org/2008/08/27/packaging-wxpymail-for-distribution/ note tutorial based around wxpython app wrote, concepts same.
Read more

c# - Access objects in UserControl from MainWindow in WPF -

-
i have simple xaml, how can change text property of textblock in usercontrol1 mainwindow ? <window x:class="refactorxaml.mainwindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:refactorxaml="clr-namespace:refactorxaml" title="mainwindow" height="350" width="525"> <grid> <grid.rowdefinitions> <rowdefinition height="100"></rowdefinition> <rowdefinition height="100"></rowdefinition> </grid.rowdefinitions> <grid> <refactorxaml:usercontrol1></refactorxaml:usercontrol1> </grid> <grid grid.row="1"> <button>change text</button> </grid> </grid> </window> <usercon...
Read more

javascript - How to name a jQuery function to make a browser's back button work? -

-
i'm trying write function ajaxyfy web site, works perfect, except function button. that's have now: function loading() { if (typeof history.pushstate !== "undefined") { var historycount = 0; $('.menu-item, .logo').on('click','a',function(e){ e.preventdefault(); $(this).data('clicked', true); if ($(this).is('.logo a')) { var homepage = $(this).attr('href'); function1(homepage); history.pushstate(null, null, homepage); } else if ($(this).is('.projects a')) { var projects = $(this).attr('href'); function2(projects); history.pushstate(null, null, projects); } else { var pages = $(this).attr('href'); function3(pages); history.pushstate(null, null, pages); ...
Read more