swift中UIView的使用

let view = UIView(frame: CGRectMake(10.0,10.0,200.0,200.0))
        // 添加到父视图
        self.view.addSubview(view)
        // 背景颜色
        view.backgroundColor = UIColor.redColor()

// layer层属性设置
        view.layer.cornerRadius = 5.0
        view.layer.borderColor = UIColor.greenColor().CGColor
        view.layer.borderWidth = 1.0
        view.layer.masksToBounds = true

let view01 = UIView(frame: CGRectMake(10.0,50.0,50.0))
        view.addSubview(view01)
        view01.backgroundColor = UIColor.yellowColor()
        
        let view02 = UIView(frame: CGRectMake(20.0,20.0,60.0,60.0))
        view.addSubview(view02)
        view02.backgroundColor = UIColor.blueColor()
        
        let view03 = UIView(frame: CGRectMake(30.0,30.0,70.0,70.0))
        view.addSubview(view03)
        view03.backgroundColor = UIColor.purpleColor()
        
        let view04 = UIView(frame: CGRectMake(10.0,70.0))
        view04.backgroundColor = UIColor.orangeColor()

// 显示在最前面
        view.bringSubviewToFront(view01)
        // 显示在最后面
        view.sendSubviewToBack(view03)
        // 插入指定位置
        view.insertSubview(view04,aboveSubview: view03)
        // 交换位置
        view.exchangeSubviewAtIndex(2,withSubviewAtIndex: 3)

// 其他属性设置
        view.userInteractionEnabled = true
        view.hidden = false
        view.alpha = 1.0

// 父视图
        let superView = view.superview
        print(superView)
        // 子视图数组
        let subViewArray = view.subviews
        print(subViewArray)

let currentView = view
        // 自定义view
//        let rect = CGRectMake(10.0,(CGRectGetMinY(currentView.frame) + CGRectGetHeight(currentView.bounds) + 10.0),300.0,40.0)
        let rect = CGRectMake(currentView.right,(currentView.bottom + 10.0),(currentView.width / 2),40.0)
        let syView = SYView.init(frame: rect)
        syView.height = 100.0
        self.view.addSubview(syView)
        syView.backgroundColor = UIColor.greenColor()
        print(syView)

效果图如下所示

定论UIView的类扩展属性，即类似于Objective-C中使用left、right、top、bottom、width、height的属性。

创建swift文件，用于创建Extension类

import Foundation
import UIKit

extension UIView
{
    // MARK: - left/right/top/bottom/width/height属性
    
    /// 左间距
    var left:CGFloat {
        get {
            return self.frame.origin.x
        }
        set(newValue) {
            var rect = self.frame
            rect.origin.x = newValue
            self.frame = rect
        }
    }
    
    /// 右间距
    var right:CGFloat {
        get {
            return (self.frame.origin.x + self.frame.size.width)
        }
        set(newValue) {
            var rect = self.frame
            rect.origin.x = (newValue - self.frame.size.width)
            self.frame = rect
        }
    }
    
    /// 顶端间距
    var top:CGFloat {
        get {
            return self.frame.origin.y
        }
        set(newValue) {
            var rect = self.frame
            rect.origin.y = newValue
            self.frame = rect
        }
    }
    
    /// 底端间距
    var bottom:CGFloat {
        get {
            return (self.frame.origin.y + self.frame.size.height)
        }
        set(newValue) {
            var rect = self.frame
            rect.origin.y = (newValue - self.frame.size.height)
            self.frame = rect
        }
    }
    
    /// 长度
    var width:CGFloat {
        get {
            return self.frame.size.width
        }
        set(newValue) {
            var rect = self.frame
            rect.size.width = newValue
            self.frame = rect
        }
    }
    
    /// 宽度
    var height:CGFloat {
        get {
            return self.frame.size.height
        }
        set(newValue)
        {
            var rect = self.frame
            rect.size.height = newValue
            self.frame = rect
        }
    }
}

（编辑：李大同）

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