Question

我有一个UIView，我希望出现在设备宽度和高度的随机位置。我也希望Y位置不低于20pts。这就是我所做的，但UIView有时会出现在屏幕外或部分离开屏幕：

superDab = SuperDabButton(frame:CGRectMake(CGFloat(arc4random_uniform(UInt32((self.view?.frame.size.width)! - (superDabImage!.size.width)))),
            (CGFloat(arc4random_uniform(UInt32((self.view?.frame.size.height)! - (superDabImage!.size.height))))),
            (superDabImage!.size.width),
            (superDabImage!.size.height)),
            time: 5.0)
        self.view?.addSubview(superDab!)

请帮忙！谢谢！

Answer 1

通过这样做可以实现这一点，并且可以应用于具有相同概念的任何事物：

var xPos = CGFloat()
var yPos = CGFloat()

//Finds random CGFloat within the width and height
xPos = (CGFloat(arc4random_uniform(UInt32((self.view?.frame.size.width)!))))
yPos = (CGFloat(arc4random_uniform(UInt32((self.view?.frame.size.height)!))))

//If statements saying that if the x pos is larger than the width - the size of the button, 
then do modulus on it using the equation below 
if (xPos > ((self.view?.bounds.width)! - (self.view?.bounds.width)! * 0.20)){
    xPos = xPos % ((self.view?.bounds.width)! - (self.view?.bounds.width)! * 0.20)}
if (yPos > ((self.view?.bounds.height)! - (self.view?.bounds.width)! * 0.20)){
    yPos = yPos % ((self.view?.bounds.height)! - (self.view?.bounds.width)! * 0.20)}

//Note: I use the "- (self.view?.bounds.width)! * 0.20" for the ypos only because 
my button is a circle, so most likely others would use the height instead of width

Swift：随机化视图中的UIButton位置

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