//
// ViewController.swift
// autolayout-代码
//
// Created by zhang on 16/2/29.
// Copyright © 2016年 jin. All rights reserved.
//
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.constraintB()
}
func constraintB()
{
// 创建view
let viewA = UIView()
viewA.backgroundColor = UIColor.redColor()
viewA.translatesAutoresizingMaskIntoConstraints = false
let viewB = UIView()
viewB.backgroundColor = UIColor.grayColor()
viewB.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(viewA)
self.view.addSubview(viewB)
let viewAleft = NSLayoutConstraint(item: viewA, attribute: NSLayoutAttribute.Left, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Left, multiplier: 1.0, constant: 30)
let viewAright = NSLayoutConstraint(item: viewA, attribute: NSLayoutAttribute.Right, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Right, multiplier: 1.0, constant: -30)
let viewAtop = NSLayoutConstraint(item: viewA, attribute: NSLayoutAttribute.Top, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Top, multiplier: 1.0, constant: 30)
let viewAheight = NSLayoutConstraint(item: viewA, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1.0, constant: 60)
let viewBright = NSLayoutConstraint(item: viewB, attribute: NSLayoutAttribute.Right, relatedBy: NSLayoutRelation.Equal, toItem: viewA, attribute: NSLayoutAttribute.Right, multiplier: 1.0, constant: 0)
let viewBheight = NSLayoutConstraint(item: viewB, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: viewA, attribute: NSLayoutAttribute.Height, multiplier: 1.0, constant: 0)
let viewBwidth = NSLayoutConstraint(item: viewB, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: viewA, attribute: NSLayoutAttribute.Width, multiplier: 0.5, constant: 0)
let viewBtop = NSLayoutConstraint(item: viewB, attribute: NSLayoutAttribute.Top, relatedBy: NSLayoutRelation.Equal, toItem: viewA, attribute: NSLayoutAttribute.Bottom, multiplier: 1, constant: 30)
self.view.addConstraints([viewBwidth,viewBheight,viewBright,viewBtop])
self.view.addConstraints([viewAleft,viewAright,viewAtop,viewAheight])
}
func constraintA()
{
// 创建view
let viewA = UIView()
viewA.backgroundColor = UIColor.redColor()
viewA.translatesAutoresizingMaskIntoConstraints = false
let viewB = UIView()
viewB.backgroundColor = UIColor.grayColor()
viewB.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(viewA)
self.view.addSubview(viewB)
// 创建约束
// 左
let viewAleft = NSLayoutConstraint(item: viewA, attribute: NSLayoutAttribute.Left, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Left, multiplier: 1, constant: 30)
// 下
let viewAbottom = NSLayoutConstraint(item: viewA, attribute: NSLayoutAttribute.Bottom, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Bottom, multiplier: 1, constant: -30)
// 宽度
let viewAwidth = NSLayoutConstraint(item: viewA, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: viewB, attribute: NSLayoutAttribute.Width, multiplier: 1, constant: 0)
// 高度
let viewAheight = NSLayoutConstraint(item: viewA, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: 50)
// 右
let viewBright = NSLayoutConstraint(item: viewB, attribute: NSLayoutAttribute.Right, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Right, multiplier: 1, constant: -30)
// 下
let viewBbottom = NSLayoutConstraint(item: viewB, attribute: NSLayoutAttribute.Bottom, relatedBy: NSLayoutRelation.Equal, toItem: viewA, attribute: NSLayoutAttribute.Bottom, multiplier: 1, constant: 0)
// 高
let viewBheight = NSLayoutConstraint(item: viewB, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: viewA, attribute: NSLayoutAttribute.Height, multiplier: 1, constant: 0)
// 左
let viewBleft = NSLayoutConstraint(item: viewB, attribute: NSLayoutAttribute.Left, relatedBy: NSLayoutRelation.Equal, toItem: viewA, attribute: NSLayoutAttribute.Right, multiplier: 1, constant: 30)
// 添加约束
self.view.addConstraints([viewAleft,viewAbottom,viewAheight,viewAwidth])
self.view.addConstraints([viewBbottom,viewBright,viewBheight,viewBleft])
}
}