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How to get root view controller?
... [[UIApplication sharedApplication]delegate] window] rootViewController];
Swift
let appDelegate = UIApplication.sharedApplication().delegate as AppDelegate
let viewController = appDelegate.window!.rootViewController as YourViewController
Swift 3
let appDelegate = U...
Set the maximum character length of a UITextField
...nge)range replacementString:(NSString *)string {
// Prevent crashing undo bug – see note below.
if(range.length + range.location > textField.text.length)
{
return NO;
}
NSUInteger newLength = [textField.text length] + [string length] - range.length;
retu...
Check time difference in Javascript
...
I know this is ancient, but where in all this gibberish does anything get read from form fields? All I see is some hard-coded example code. How do I get the difference between whatever times my user typed into my two input type="text" boxes, rather than between 9:00 AM and 5:00 PM...
Why does !{}[true] evaluate to true in JavaScript?
...
Because {}[true] does not return true, but undefined, and undefined is evaluated as false:
http://jsfiddle.net/67GEu/
'use strict';
var b = {}[true];
alert(b); // undefined
b = !{}[true];
alert(b); // true
...
How does collections.defaultdict work?
I've read the examples in python docs, but still can't figure out what this method means. Can somebody help? Here are two examples from the python docs
...
Storyboard - refer to ViewController in AppDelegate
...ble with the relevant class and turned it into an IBOutlet property, but I don't see any way of being able to refer to the new ViewController in code - any attempt to ctrl-drag a connection doesn't work.
...
SQL Case Sensitive String Compare
How do you compare strings so that the comparison is true only if the cases of each of the strings are equal as well. For example:
...
Is it better in C++ to pass by value or pass by constant reference?
... use pass by const ref for all types, except for builtin types (char, int, double, etc.), for iterators and for function objects (lambdas, classes deriving from std::*_function).
This was especially true before the existence of move semantics. The reason is simple: if you passed by value, a copy of...
How does the Brainfuck Hello World actually work?
...0][0][*0*][1][0]...
2. Input
To read character you use comma ,. What it does is: Read character from standard input and write its decimal ASCII code to the actual cell.
Take a look at ASCII table. For example, decimal code of ! is 33, while a is 97.
Well, lets imagine your BF program memory loo...
How to convert byte array to string [duplicate]
I created a byte array with two strings. How do I convert a byte array to string?
4 Answers
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