ios - 在 Swift 1.2 中获取触摸坐标

Question

我试图获取屏幕上触摸的坐标，但每次它只给我 0、0。我只能在新版本的 Swift 中找到有关此功能的基本帮助，而没有任何关于这个问题的信息.我在这里做错了什么？

override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) {
        let touch = touches.first as! UITouch
        let location = touch.locationInView(self.view)
        NSLog("location: %d, %d", location.x, location.y)
}

谢谢!

Answer 1

根据 swift 1.2

override func touchesEnded(touches: Set<NSObject>!, withEvent event: UIEvent!) {
    if let touch = touches.first as? UITouch {
        let location = touch.locationInView(self.view)
        println("Location: \(location)")
    }
}

根据 swift 1.1

override func touchesEnded(touches: NSSet, withEvent event: UIEvent) {
        let touch = touches.anyObject() as? UITouch
        let location = touch?.locationInView(self.view)
        println("Location: \(location)")
    }

已测试。