iphone - Calc UICollectionViewCell height while downloading image from internet -


i want create water fall layout using chtcollectionviewwaterfalllayout. noticed in demo cell height fixed , it's in array. but, right now, got image url , want show on screen, height not knowing. so, heightforitematindexpath datasource not working. how calc height of image url before it's downloaded. or can downloading , displaying image in cellforitematindexpath datasource method while calc height , set cell height in heightforitematindexpath datasource method? how that?

if image downloaded own server, recommend send meta data first showing image dimensions , use calculate height before downloading image.

if image isn't on server, best solution add bool array indicating whether corresponding image downloaded or not, if downloaded, adjust height, if not, use default height.

and add delegate cell calls below method when image loaded:

- (void) imageloadedatindexpath:(nsindexpath)indexpath {       [self.tableview beginupdates];      [self.tableview reloadrowsatindexpaths:[nsarray arraywithobjects:indexpath, nil] withrowanimation:uitableviewrowanimationnone];      [self.tableview endupdates];  }

hope helps.


Comments

Post a Comment

Popular posts from this blog

basic authentication with http post params android -

i doing basic authentication passing username , password , using basicnamevaluepair sending post params response service. my method: public stringbuilder callservicehttppost(string username, string password, string type) { // create new httpclient , post header httpclient httpclient = new defaulthttpclient(); httppost httppost = new httppost(webservice + type); httpresponse response = null; stringbuilder total = new stringbuilder(); try { url url = new url(webservice + type); /*string base64encodedcredentials = base64.encodetostring((username + ":" + password).getbytes(), base64.url_safe | base64.no_wrap);*/ string base64encodedcredentials = "basic " + base64.encodetostring( (username + ":" + password).getbytes(), base64.no_wrap); httppost.setheader("auth...
Read more

vb.net - Virtual Keyboard commands -

i wondering difference between virtual these keyboard commands is: keyeventf_extendedkey , keyeventf_keyup is. everywhere have looked gives me description based off integers , not want know each of them does. you've tagged question vb.net, these have nothing @ vb.net. they're constants defined in windows header files, use win32 api functions. as far difference, can't tell looking @ values. individual values not particularly important, that's why named identifiers used. what's important used , documentation functions tells mean. the first one, keyeventf_extendedkey , used keybdinput structure (which used along e.g. sendinput function) pass information synthesized keyboard input. if flag used, means scan code should interpreted extended key. technically, means scan code preceded prefix byte value 224 (&he0 in hexadecimal notation). the second one, keyeventf_keyup , 1 of flags available use structure. means key being released (going up)...
Read more

css - Firefox for ubuntu renders wrong colors -

Image
i've got following problem: i'm developing website, while testing around i've noticed firefox , chromium display css bar in different colors. when switched between several machine come conclusion firefox ubuntu problem. on other devices i've tested website. it's fine. the differences between chrome , firefox rendering: firefox: chromium: note: firefox ubuntu problem. does knows why , came solution? https://bugzilla.mozilla.org/show_bug.cgi?id=655637 bug 629312 - firefox displays wrong colors on image (only linux) open about:config , rechange gfx.color_management.mode 2 0.
Read more