swift为UIView添加extension扩展frame

添加swift file：UIView+Extension

import UIKit

extension UIView {

    // x
    var x : CGFloat {

        get {

            return frame.origin.x
        }

        set(newVal) {

            var tmpFrame : CGRect = frame
            tmpFrame.origin.x     = newVal
            frame                 = tmpFrame
        }
    }

    // y
    var y : CGFloat {

        get {

            return frame.origin.y
        }

        set(newVal) {

            var tmpFrame : CGRect = frame
            tmpFrame.origin.y     = newVal
            frame                 = tmpFrame
        }
    }

    // height
    var height : CGFloat {

        get {

            return frame.size.height
        }

        set(newVal) {

            var tmpFrame : CGRect = frame
            tmpFrame.size.height  = newVal
            frame                 = tmpFrame
        }
    }

    // width
    var width : CGFloat {

        get {

            return frame.size.width
        }

        set(newVal) {

            var tmpFrame : CGRect = frame
            tmpFrame.size.width   = newVal
            frame                 = tmpFrame
        }
    }

    // left
    var left : CGFloat {

        get {

            return x
        }

        set(newVal) {

            x = newVal
        }
    }

    // right
    var right : CGFloat {

        get {

            return x + width
        }

        set(newVal) {

            x = newVal - width
        }
    }

    // top
    var top : CGFloat {

        get {

            return y
        }

        set(newVal) {

            y = newVal
        }
    }

    // bottom
    var bottom : CGFloat {

        get {

            return y + height
        }

        set(newVal) {

            y = newVal - height
        }
    }

    var centerX : CGFloat {

        get {

            return center.x
        }

        set(newVal) {

            center = CGPoint(x: newVal, y: center.y)
        }
    }

    var centerY : CGFloat {

        get {

            return center.y
        }

        set(newVal) {

            center = CGPoint(x: center.x, y: newVal)
        }
    }

    var middleX : CGFloat {

        get {

            return width /
        }
    }

    var middleY : CGFloat {

        get {

            return height /
        }
    }

    var middlePoint : CGPoint {

        get {

           return CGPoint(x: middleX, y: middleY)
        }
    }
}

简单设置x/y/width/height

import UIKit

extension UIView {

    //设置随机背景色
    func backgroundColorRandom(){

        self.backgroundColor = UIColor(red: CGFloat(CGFloat(random())/CGFloat(RAND_MAX)), green: CGFloat(CGFloat(random())/CGFloat(RAND_MAX)), blue: CGFloat(CGFloat(random())/CGFloat(RAND_MAX)), alpha: )
    }

    var x : CGFloat!{
        get{return self.frame.origin.x

        }
        set(newX){
            var rect : CGRect! = self.frame
            rect.origin.x = newX
            self.frame = rect
        }

    }

    var y : CGFloat!{
        get{
            return self.frame.origin.y
        }
        set(newY){
            var rect : CGRect! = self.frame
            rect.origin.y = newY
            self.frame = rect
        }

    }

    var width : CGFloat!{
        get{
            return self.frame.size.width
        }
        set(newW){
            var rect : CGRect! = self.frame
            rect.size.width = newW
            self.frame = rect
        }

    }

    var height : CGFloat!{
        get{
            return self.frame.size.height
        }
        set(newH){
            var rect : CGRect! = self.frame
            rect.size.height = newH
            self.frame = rect
        }

    }

}

相关链接：swift关于UIView设置frame值的extension