Objective-C Properties and Pointers to Swift - ios

Question

I just started learning Swift and I have been consulting Apple's Dev Guide but some of the syntax when dealing with properties and pointers is throwing me off. Apple explains that properties just use dot syntax and even the API seems to reflect that but it's not working to my desired to effect. Here's what I've been working on specifically. I am also struggling with instance initialization. I have already properly created a bridging header Any guidance would be appreciated. Thanks!
This is the code I am trying to emulate in swift.
#property (nonatomic) SFWaterNode *waterSurface;
#property (nonatomic) NSTimeInterval lastUpdateTime;
#end
#implementation GameScene
- (void)didMoveToView:(SKView *)view {
self.backgroundColor = [SKColor blackColor];
CGPoint startPoint = CGPointMake(-1, self.size.height/2);
CGPoint endPoint = CGPointMake(self.size.width, self.size.height/2);
self.waterSurface = [SFWaterNode nodeWithStartPoint:startPoint endPoint:endPoint depth:self.size.height/2 color:[SKColor blueColor]];
[self addChild:self.waterSurface];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInNode:self];
[self.waterSurface splash:location speed:-50];
}
- (void)update:(CFTimeInterval)currentTime {
[self.waterSurface update:currentTime];
}
#end

Answer 1

Try this code below:
public var waterSurface:SFWaterNode?
var lastUpdateTime:NSTimeInterval
func didMoveToView(view:SKView) {
self.backgroundColor = .black
let startPoint:CGPoint = CGPoint.init(x: -1, y: self.size.height/2)
let endPoint:CGPoint = CGPoint(x: -1, y: self.size.height/2)
self.waterSurface = SFWaterNode.nodeWithStartPoint(startPoint, endPoint:endPoint, depth:self.size.height/2, color:.blue)
self.addChild(self.waterSurface)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch:UITouch = touches.anyObject()
let location:CGPoint = touch.location(inNode: self)
self.waterSurface.splash(location, speed:-50)
}
func update(curentTime:CFTimeInterval) {
self.waterSurface.update(currentTime)
}