Cocoa autolayout constraint - programmatic padding of variable number of views -


i want able add new views superview keep constant vertical distance between each other. tried programmatically set constraint each view not figure out how it. problem not know beforehand number or relative position of views.

is there way programmaically set constraint each view regardless of whatever other views neighbor, autolayout keep constant spacing between views?

possible short code snippet looking for:

nsmutablearray* newverticalconstraints = [nsmutablearray array]; uiview* firstview = nil; uiview* secondview = nil; uiview* superview = <your container view>; nsarray* subviews = [superview subviews]; if ([subviews count] > 0) {     firstview = [subviews objectatindex:0];     // add first constraint     [newverticalconstraints addobjectsfromarray:[nslayoutconstraint constraintswithvisualformat:@"v:|-10-[firstview]" options:0 metrics:nil views:nsdictionaryofvariablebindings(firstview)]];      (int = 1; < [subviews count]; i++) {         secondview = [subviews objectatindex:i];         [newverticalconstraints addobjectsfromarray:[nslayoutconstraint constraintswithvisualformat:@"v:[firstview]-10-[secondview]" options:0 metrics:nil views:nsdictionaryofvariablebindings(firstview,secondview)]];         firstview = secondview;     }      // add last constraint     [newverticalconstraints addobjectsfromarray:[nslayoutconstraint constraintswithvisualformat:@"v:[firstview]-10-|" options:0 metrics:nil views:nsdictionaryofvariablebindings(firstview)]];      [superview removeconstraints:self.verticalconstraints];     [superview addconstraints:newverticalconstraints];     // save vertical constraints able remove them     self.verticalconstraints = newverticalconstraints; }

Comments

Post a Comment

Popular posts from this blog

ios - iPhone/iPad different view orientations in different views , and apple approval process -

i force app's home screen portrait , other views landscape. apple rejects app if this? if not , how force first screen launch in portrait mode? , force other screens launch in landscape. this not duplicate question search every possible answer in website. i force app's home screen portrait , other views landscape. apple rejects app if this? no apple not reject app this. have lot of apps doesn't support orientation. forcing on 1 screen won't cause app reject. if not , how force first screen launch in portrait mode? , force other screens launch in landscape. can on write : -(nsuinteger)supportedinterfaceorientations; function.
Read more

java Extracting Zip file -

i'm looking way extract zip file. far have tried java.util.zip , org.apache.commons.compress, both gave corrupted output. basically, input zip file contain 1 single .doc file. java.util.zip: output corrupted. org.apache.commons.compress: output blank file, 2 mb size. so far commercial software winrar work perfectly. there java library make use of this? this method using java.util library: public void extractzipnative(file filezip) { zipinputstream zis; stringbuilder sb; try { zis = new zipinputstream(new fileinputstream(filezip)); zipentry ze = zis.getnextentry(); byte[] buffer = new byte[(int) ze.getsize()]; fileoutputstream fos = new fileoutputstream(this.tempfolderpath+ze.getname()); int len; while ((len=zis.read(buffer))>0) { fos.write(buffer); } fos.flush(); fos.close(); } catch (filenotfoundexception e) { // todo auto-generated catch block ...
Read more

C# WinForm - loading screen -

i ask how make loading screen (just picture or something) appears while program being loaded, , disappears when program has finished loading. in fancier versions, have seen process bar (%) displayed. how can have that, , how calculate % show on it? i know there form_load() event, not see form_loaded() event, or % property / attribute anywhere. all need create 1 form splash screen , show before main start showing landing page , close splash once landing page loaded. class splashform { //delegate cross thread call close private delegate void closedelegate(); //the type of form displayed splash screen. private static splashform splashform; static public void showsplashscreen() { // make sure launched once. if (splashform != null) return; thread thread = new thread(new threadstart(splashform.showform)); thread.isbackground = true; thread.setapartmentstate(apartmentstate.sta); thread....
Read more