AutoLayout Swift demo
import UIKit import Swift class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() let v1 = UIView() let v2 = UIView() v1.backgroundColor = UIColor.redColor() v2.backgroundColor = UIColor.blueColor() //遵循autolayout抛弃原有的宽和高 v1.translatesAutoresizingMaskIntoConstraints = true v2.translatesAutoresizingMaskIntoConstraints = false view.addSubview(v1) view.addSubview(v2) //item1 =(>=,<=) item2*multiplier + constant //如果是一元约束的话就是,只针对自己的约束,如果是二元约束的话就必须添加在他们最近的共同父视图上 //set v1's height and width v1.addConstraint(NSLayoutConstraint(item: v1,attribute: .Width,relatedBy: .Equal,toItem: nil,attribute: .NotAnAttribute,multiplier: 1,constant: 100))//v1 = m*0 + constant //v1.addConstraint(NSLayoutConstraint(item: v1,attribute: .Height,relatedBy: .Equal,toItem: nil,attribute: .NotAnAttribute,multiplier: 1,constant: 100)) //set relationship between topView and v1 view.addConstraint(NSLayoutConstraint(item: v1,attribute: .Left,toItem: view,attribute: .Leading,constant: 20)) view.addConstraint(NSLayoutConstraint(item: v1,attribute: .CenterY,constant: 0)) //set v2's height and width view.addConstraint(NSLayoutConstraint(item: v2,toItem: v1,multiplier: 1,constant: 0)) view.addConstraint(NSLayoutConstraint(item: v2,attribute: .Height,36)"> //set relationship between v1 and v2 view.addConstraint(NSLayoutConstraint(item: v2,attribute: .Right,constant: 100)) view.addConstraint(NSLayoutConstraint(item: v1,toItem: v2,constant: 0)) } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |