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What is the difference between atan and atan2 in C++?
...eturn negative numbers, so you can't trace things in the 4 directions on a screen just by adding/subtracting its result.
atan2 is intended for the origin to be in the middle, and things can go backwards or down. That's what you'd use in a screen representation, because it DOES matter what direction...
ViewPager and fragments — what's the right way to store fragment's state?
...re using FragmentStatePagerAdapter). This is controlled by ViewPager.setOffscreenPageLimit(int). Because of this, directly calling methods on the fragments outside of the adapter is not guaranteed to be valid, because they may not even be alive.
To cut a long story short, your solution to use putF...
UICollectionView current visible cell index
... especially well when each item in your collection view takes up the whole screen.
Swift version
let visibleRect = CGRect(origin: collectionView.contentOffset, size: collectionView.bounds.size)
let visiblePoint = CGPoint(x: visibleRect.midX, y: visibleRect.midY)
let visibleIndexPath = collect...
How do you clear the focus in javascript?
...expert on the best way to do that; but you could certainly position it off-screen or outside of the bounds of an overflow: clip styled element. But you could just use a field that already exists on the page. Or create one just for the purpose and remove it again.
– Kevin Reid
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Display two files side by side
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Is there a way for pr to auto-detect screen width?
– Matt
Apr 11 '14 at 18:59
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iPhone viewWillAppear not firing
...realized that my second navigation controller did redefine viewWillAppear. Screening the code showed that I was not calling
[super viewWillAppear:animated];
I added it and it worked !
The documentation says:
If you override this method, you must call super at some point in your implementati...
Stop UIWebView from “bouncing” vertically?
...IWebView from bouncing vertically? I mean when a user touches their iphone screen, drags their finger downwards, and the webview shows a blank spot above the web page I had loaded?
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UIActionSheet cancel button strange behaviour
...ar:. Also note that there's a 'showFromToolbar:` method, depending on what screen furniture you have at the bottom of the screen. This, I think, is a better answer than the accepted answer.
– Stephen Darlington
Feb 22 '10 at 22:22
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Android: Clear the back stack
...nd after loging the user in, in my case it was returning to the phone home screen and I almost lost my job!
– Skynet
Mar 13 '15 at 7:18
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Android soft keyboard covers EditText field
Is there a way to make the screen scroll to allow the text field to be seen?
14 Answers
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