Added 'NibLoadableView' for easier loading of Nibs into placeholder Views.

[chow-land]

Subclassing NibLoadableView allows you to automate the loading of a Nib into a placeholder view inside another Nib, using only the Custom Class attribute.

It removes the need to perform the following manual steps every time you want a Nib that can load into a placeholder View:

• Setting an outlet for the top level view
• Setting 'translatesAutoresizingMaskIntoConstraints' to false
• Adding constraints to fit the new view into its container

• Writing boilerplate Nib loading code.

  The minimum amount of code required to use this would just be the inheritance line, i.e.:

YourCustomView: NibLoadableView {}

[brightredchilli]

seems like

 guard let topLevelObjects = Bundle.main.loadNibNamed(self.customClassString, owner: self, options: nil)

~would do it, where customClassString is an ibdesignable of type String.~ I got it...give me a think

[chow-land]

@brightredchilli Also, as a separate note, I tried another approach where instead of subclassing UIView I tried to make a UIView extension that made all UIViews conform to a NibLoadable protocol. Then I made a default implementation of init(withCoder:) in an extension of NibLoadable - but I found that the init(withCoder:) on the extension would never actually fire. I think this is by design and Apple only allows you to override methods via subclassing, so that's why I ended up going the subclass route.

[chow-land]

@brightredchilli I just had another thought.

How about instead of subclassing, I just expose this as an extension method on UIView, and leave it up to the developer to call it in initWithCoder.

E.g.:

extension UIView {
   func loadCompanionNibAndConstrainToContainer() {..}
}

class SomeView : UIView {
   init(coder aDecoder: NSCoder) {
         super.init(coder: aDecoder)
         self.loadCompanionNibAndConstrainToContainer()
      }
}

This way it would be a little more explicit what's actually happening, and you wouldn't need to subclass a special type. There would still be the redundant view level in the hierarchy, but I see that as a small price to pay for having the ability to use IBDesignable.

[chow-land]

Some background on how we can get IBDesignable working with a view that has a backing nib, i.e. how to live render a nib inside interface builder: http://justabeech.com/2014/07/27/xcode-6-live-rendering-from-nib/

Going to work on this a bit more.

[brightredchilli]

i love the idea of not having two instances of the custom view, and that looks promising.

[brightredchilli]

I have a hunch this might work, but having the two references is kind of ugly too:

class ViewController: UIViewController {

    @IBOutlet var container: NibLoadableView!
    lazy var myCustomView: CustomView {
        return container.getInnerView()
    }
}

class NibLoadableView : UIView {

  // initialization blah blah
    func getInnerView() -> T {
        return topLevelView as! T
    }
}

[ghost]

SonarQube analysis reported 2 issues

• 2 minor

Watch the comments in this conversation to review them.

[ghost]

	4 Warnings
:warning:	Array+UtilitiesTests.swift#L100 - SwiftWisdomTests/StandardLibrary/Array/Array+UtilitiesTests.swift#L100: ‘subscript(ip_safe:)’ is deprecated: Use ip_safely instead. XCTAssert(testArray[ip_safe: 3] == 4)
:warning:	Array+UtilitiesTests.swift#L101 - SwiftWisdomTests/StandardLibrary/Array/Array+UtilitiesTests.swift#L101: ‘subscript(ip_safe:)’ is deprecated: Use ip_safely instead. XCTAssert(testArray[ip_safe: 8] == 9)
:warning:	Array+UtilitiesTests.swift#L102 - SwiftWisdomTests/StandardLibrary/Array/Array+UtilitiesTests.swift#L102: ‘subscript(ip_safe:)’ is deprecated: Use ip_safely instead. XCTAssertNil(testArray[ip_safe: -1])
:warning:	Array+UtilitiesTests.swift#L103 - SwiftWisdomTests/StandardLibrary/Array/Array+UtilitiesTests.swift#L103: ‘subscript(ip_safe:)’ is deprecated: Use ip_safely instead. XCTAssertNil(testArray[ip_safe: 9])

	1 Message
:book:	Executed 142 tests, with 0 failures (0 unexpected) in 0.239 (0.296) seconds

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