CAShapeLayer Class Creation - objective-c

Question

I found a fantastic tutorial written in Swift for creating an animation when my app opens. It's written in Swift, so I'm Objective-C-ifying it for a project I'm working on, but I'm running into a little trouble adding my animation. Swift works, but I can't figure out what's wrong w/ my Objective-C version.
Creating a Complex Loading Animation in Swift
Swift Version of CAShapeLayer Class:
func expand() {
var expandAnimation: CABasicAnimation = CABasicAnimation(keyPath: "path")
expandAnimation.fromValue = ovalPathSmall.CGPath
expandAnimation.toValue = ovalPathLarge.CGPath
expandAnimation.duration = animationDuration
expandAnimation.fillMode = kCAFillModeForwards
expandAnimation.removedOnCompletion = false
// the following line I'm having trouble converting to Objective-C
addAnimation(expandAnimation, forKey: nil)
}
Objective-C Version:
- (void)expand {
CABasicAnimation *expandAnimation = [CABasicAnimation animationWithKeyPath:#"path"];
expandAnimation.fromValue = (__bridge id)(_ovalPathSmall.CGPath);
expandAnimation.toValue = (__bridge id)(_ovalPathSquishHorizontal.CGPath);
expandAnimation.duration = self.animationDuration;
expandAnimation.fillMode = kCAFillModeForwards;
expandAnimation.removedOnCompletion = NO;
// I can't figure out how to "convert" this to Objective-C
// addAnimation(expandAnimation, forKey: nil)
}
Initializers:
I suspect I'm mucking something up with the initializer, so here's the code for the working Swift one and my Objective-C-ified version below.
Swift Version:
let animationDuration: CFTimeInterval = 0.3
override init!() {
super.init()
fillColor = Colors.red.CGColor
path = ovalPathSmall.CGPath
}
required init(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
Objective-C Version:
This is my attempt at mimicking the initializer in my .m file:
- (instancetype)init
{
self = [super init];
if (self) {
self.animationDuration = 0.3;
self.fillColor = [UIColor redColor].CGColor;
self.path = self.ovalPathSmall.CGPath;
}
return self;
}
Thank you for reading and I welcome your input.

Answer 1

To answer your immediate question, I think you just need [self addAnimation...], but I don't know what you have tried.
To answer your comment though, at least at this point, it is pretty easy. See the mixing and matching section of: https://developer.apple.com/library/ios/documentation/Swift/Conceptual/BuildingCocoaApps/MixandMatch.html#//apple_ref/doc/uid/TP40014216-CH10-XID_78.
The short version is that the Swift compiler runs first, and generates Obj-C stubs that the Obj-C compiler can understand in a single header file based on your project name. This file is generated in the build output (Derived Data etc). You need to import that file into your Ojb-C code, per the example in the above link.
#import "ProductModuleName-Swift.h"