如何获得视图的中心 [英] How to get the centre of the view

问题描述

我试图通过使用下面的代码来获得我的视图的中心，所使用的类来自 DTIActivityIndi​​catorView，它向视图添加了一个自定义活动指示器.

I'm trying to get the center of my view by using the code below, the class being used is from the DTIActivityIndicatorView which add a custom activity indicator to the view.

var midX = CGRectGetMidX(self.view.bounds)
var midY = CGRectGetMidY(self.view.bounds)

let topStoriesActivityIndicator: DTIActivityIndicatorView = DTIActivityIndicatorView(frame: CGRect(x: midX, y: midY, width:80.0, height:80.0))

但是上面的代码给了我以下结果，其中活动指示器没有居中.

But the code above is giving me the following result where the activity indicator isn't centered in the middle.

推荐答案

Swift 4 扩展:

extension CGRect {
    var center: CGPoint { return CGPoint(x: midX, y: midY) }
}

let someRect = CGRect(x: 10, y: 10, width: 200, height: 40)

let theCenter = someRect.center // {x 110 y 30}

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