ios - 为什么我的 Iphone 4s 中的 UISlider 位置与所有其他设备不同？

Question

我将 slider 放置在屏幕中间，并且它在除 4s 之外的所有设备中都正确放置。我不知道如何使 slider 像所有其他设备一样位于屏幕中间而不是右侧。这是我使用的代码:

if UIDevice.currentDevice().userInterfaceIdiom == .Phone {

        let scaleFactor = UIScreen.mainScreen().bounds.width / 320


        middleSlider = UISlider(frame: CGRectMake(125 * scaleFactor, 153 * scaleFactor, 150, 50))
        middleSlider.tintColor = UIColor.whiteColor()
        middleSlider.minimumTrackTintColor = UIColor.whiteColor()
        middleSlider.maximumTrackTintColor = UIColor.whiteColor()
        middleSlider.value = 1.0
        middleSlider.continuous = true
        middleSlider.userInteractionEnabled = true
        self.view?.addSubview(middleSlider)
}

if UIDevice.currentDevice().userInterfaceIdiom == .Pad {

        let scaleFactor = UIScreen.mainScreen().bounds.width / 320
        middleSlider = UISlider(frame: CGRectMake(130 * scaleFactor, 650, 200, 150))
        middleSlider.tintColor = UIColor.whiteColor()
        middleSlider.minimumTrackTintColor = UIColor.whiteColor()
        middleSlider.maximumTrackTintColor = UIColor.whiteColor()
        middleSlider.value = 1.0
        middleSlider.continuous = true
        middleSlider.userInteractionEnabled = true
        self.view?.addSubview(middleSlider)

}

Answer 1

要使 Slider 居中，您可以简单地执行以下操作

middleSlider = UISlider(frame: CGRectMake(self.view.bounds.width/2 - 150/2, 153 * scaleFactor, 150, 50));

它也将以所有设备为中心。