import Foundation
import UIKit
import CoreGraphics
extension UIView{
var left:CGFloat{
set{
var frame = self.frame
frame.origin.x = newValue
self.frame = frame
}
get{
return self.frame.origin.x
}
}
var top:CGFloat{
set{
var frame = self.frame
frame.origin.y = newValue
self.frame = frame
}
get{
return self.frame.origin.y
}
}
var right:CGFloat{
set{
var frame = self.frame
frame.origin.x = newValue - frame.size.width
self.frame = frame
}
get{
return self.frame.origin.x + self.frame.size.width
}
}
var bottom:CGFloat{
set{
var frame = self.frame
frame.origin.y = newValue - frame.size.height
self.frame = frame
}
get{
return self.frame.origin.y + self.frame.size.height
}
}
var centerX:CGFloat{
set{
self.center = CGPoint(x:newValue, y:self.center.x)
}
get{
return self.center.x
}
}
var centerY:CGFloat{
set{
self.center = CGPoint(x:self.center.x, y:newValue)
}
get{
return self.center.y
}
}
var width:CGFloat{
set{
var frame = self.frame
frame.size.width = newValue
self.frame = frame
}
get{
return self.frame.size.width
}
}
var height:CGFloat{
set{
var frame = self.frame
frame.size.height = newValue
self.frame = frame
}
get{
return self.frame.size.height
}
}
}
Swift学习之UIView延展添加新属性left,right,top,bottom,width,height,centerx,centery
原文：http://www.cnblogs.com/today2013/p/7278901.html