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UICollectionView current visible cell index
...the method that ended up working for me. It was a combination of @Anthony & @iAn's methods.
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
CGRect visibleRect = (CGRect){.origin = self.collectionView.contentOffset, .size = self.collectionView.bounds.size};
CGPoint ...
presentViewController:animated:YES view will not appear until user taps again
... if self != UIViewController.self {
return
}
dispatch_once(&DispatchToken.token) {
let originalSelector = Selector("presentViewController:animated:completion:")
let swizzledSelector = Selector("wrappedPresentViewController:animated:completion:")
let originalMeth...
if/else in a list comprehension
...
You can totally do that. It's just an ordering issue:
[unicode(x.strip()) if x is not None else '' for x in row]
In general,
[f(x) if condition else g(x) for x in sequence]
And, for list comprehensions with if conditions only,
[f...
Wrapping StopWatch timing with a delegate or lambda?
... sw.Stop();
return sw.ElapsedMilliseconds;
}
}
Then call it like this:
var s = new Stopwatch();
Console.WriteLine(s.Time(() => DoStuff(), 1000));
You could add another overload which omits the "iterations" parameter and calls this version with some default value (like 100...
Python csv string to array
...hat it doesn't take into account of "string escaping," i.e. 3, "4,5,6, 6 shall be treated as three fields instead of five.
– Zz'Rot
Feb 9 '16 at 4:16
...
Why are Python lambdas useful? [closed]
...ut lambda functions? Like
lambda x: x**2 + 2*x - 5
Those things are actually quite useful. Python supports a style of programming called functional programming where you can pass functions to other functions to do stuff. Example:
mult3 = filter(lambda x: x % 3 == 0, [1, 2, 3, 4, 5, 6, 7, 8, 9])...
Fastest sort of fixed length 6 int array
...a? Some algorithms will perform better with certain kinds of data. For example, insertion sort performs better on sorted or almost-sorted dat, so it will be the better choice if there's an above-average chance of almost-sorted data.
The algorithm you posted is similar to an insertion sort, but it...
Converting String to Int with Swift
...t is UITextField
// check a and b before unwrapping using !
if a && b {
var ans = a! + b!
answerLabel.text = "Answer is \(ans)" // answerLabel ie UILabel
} else {
answerLabel.text = "Input values are not numeric"
}
Update for Swift 4
...
let a:Int?...
Line-breaking widget layout for Android
...tence'?), the ViewGroup widget containing the words. As space required for all 'words' in a 'sentence' would exceed the available horizontal space on the display, I would like to wrap these 'sentences' as you would a normal piece of text.
...
Purging file from Git repo failed, unable to create new backup
...can find those in .git/refs/original/…. Either delete that directory and all files within, or use the -f flag to force Git to delete the old references.
git filter-branch -f \
--index-filter 'git rm --cached --ignore-unmatch Rakefile' HEAD
...