show-hide

I know how to modify a existing constraint. But I would to know if someone has found a solution to get a constraint without save this one as a property. Current solution to set Constraint height: 1) save NSLayoutConstraint in a variable: NSLayoutConstraint *heightConstraint = [NSLayoutConstraint constraintWithItem:myView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0f constant:20]; [self.view addConstraint:heightConstraint]; 2) Set the constant of the Constraint saved to "0.0" ( to hide this view)

Below is my javascript code which i used to show a div when clicked on a button . How can I hide it when clicked again? And then on clicking it, div should be visible again? <script type="text/javascript"> var _hidediv = null; function showdiv(id) { if(_hidediv) _hidediv(); var div = document.getElementById(id); div.style.display = 'block'; _hidediv = function () { div.style.display = 'none'; }; } </script> In case you are interested in a jQuery soluton: This is the HTML <a id="button" href="#">Show/Hide</a> <div id="item">Item</div> This is the jQuery script $( "#button" ).click(function() {

How can I show/hide the desktop icons programmatically, using C#? I'm trying to create an alternative desktop, which uses widgets, and I need to hide the old icons. You can do this using the Windows API. Here is sample code in C# that will toggle desktop icons. [DllImport("user32.dll", SetLastError = true)] static extern IntPtr FindWindow(string lpClassName, string lpWindowName); [DllImport("user32.dll", SetLastError = true)] static extern IntPtr GetWindow(IntPtr hWnd, GetWindow_Cmd uCmd); enum GetWindow_Cmd : uint { GW_HWNDFIRST = 0, GW_HWNDLAST = 1, GW_HWNDNEXT = 2, GW_HWNDPREV = 3, GW_OWNER