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How to make a class conform to a protocol in Swift?
... conform to protocol 'NSObjectProtocol'
You have to make your class inherit from NSObject to conform to the NSObjectProtocol. Vanilla Swift classes do not. But many parts of UIKit expect NSObjects.
class CustomDataSource : NSObject, UITableViewDataSource {
}
But this:
Type 'CellDatasDataSo...
What is Haskell used for in the real world? [closed]
There is a lot of hype around Haskell, however, it is hard to get information on how it is used in the real world applications. What are the most popular projects / usages of Haskell and why it excels at solving these problems?
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Difference between object and class in Scala
...object O creates a singleton object O as instance of some anonymous class; it can be used to hold static members that are not associated with instances of some class.
object O extends T makes the object O an instance of trait T; you can then pass O anywhere, a T is expected.
if there is a class C, t...
EF Code First foreign key without navigation property
Let's say I have the following entities:
6 Answers
6
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What is `params.require(:person).permit(:name, :age)` doing in Rails 4?
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The params in a controller looks like a Hash, but it's actually an instance of ActionController::Parameters, which provides several methods such as require and permit.
The require method ensures that a specific parameter is present, and if it's not provided, the require me...
What is the difference between Int and Integer?
...
"Integer" is an arbitrary precision
type: it will hold any number no
matter how big, up to the limit of
your machine's memory…. This means you never have
arithmetic overflows. On the other
hand it also means your arithmetic is
rel...
How to recover a dropped stash in Git?
I frequently use git stash and git stash pop to save and restore changes in my working tree. Yesterday I had some changes in my working tree that I had stashed and popped, and then I made more changes to my working tree. I'd like to go back and review yesterday's stashed changes, but git stash ...
How to call Android contacts list?
...to call the contacts list function, pick a contact, then return to my app with the contact's name. Here's the code I got on the internet, but it doesnt work.
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What are the use(s) for tags in Go?
In the Go Language Specification , it mentions a brief overview of tags:
3 Answers
3...
Make first letter of a string upper case (with maximum performance)
I have a DetailsView with a TextBox
and I want the input data be saved always with the FIRST LETTER IN CAPITAL.
41 ...