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想知道为什么当我将WhiteDot拖到SmallDot上时,它会向我的UITextField添加多于1个?它每次运行iPhone模拟器都有所不同。有时会增加11,2,3,5等等。不知道为什么? 另一个问题是,当SmallDot消失时,我也希望它在指定的视图中产卵。分数在右上角。UITextField添加多于1,随机产生
class SecondViewController: UIViewController {
private var AddOne = 0
@IBOutlet weak var Score: UITextField!
}
@IBAction func handlePan(recognizer:UIPanGestureRecognizer) {
let translation = recognizer.translation(in: self.view)
if let view = recognizer.view {
view.center = CGPoint(x:view.center.x + translation.x,
y:view.center.y + translation.y)
}
recognizer.setTranslation(CGPoint.zero, in: self.view)
if (WhiteDot.frame.contains(SmallDot.frame)) {
SmallDot.image = nil;
AddOne += 1
Score.text = "\(AddOne)"
}
}
}
在Duncan的回答中展开,你应该尝试使用手势的'state'属性('UIGestureRecognizerState')。 – n00bProgrammer