Objective-C 属性和指向 Swift 的指针

Question

我刚开始学习 Swift，我一直在查阅 Apple 的开发指南，但是处理属性和指针时的一些语法让我很反感。苹果解释说属性只是使用点语法，甚至 API 似乎也反映了这一点，但它并没有达到我想要的效果。这是我一直在做的具体工作。我也在为实例初始化而苦苦挣扎。 我已经正确地创建了一个桥接头任何指导将不胜感激。谢谢！

这是我试图在 swift 中模拟的代码。

@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

试试下面的代码：

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)
}