ios bounds和frame的区别(bounds的应用)

苹果官方文档定义连接：
bounds-UIView | Apple Developer Documentation
返回上级目录：IOS文档学习

1.定义和比较

• bounds：在自己的坐标系中描述view的位置和大小

• frame: 在父视图的坐标系中描述view的位置和大小

• 改变view.frame的x和y值会改变view在父视图中的位置，而改变view.bounds的x和y值会改变view的子视图在view中的位置

2.通过改变bounds的x和y来改变子视图的位置（demo(代码+gif)）

2.1 如下图,绿图和蓝图是黄图的子视图,红图是绿图的子视图，初始和还原状态下所有视图的bounds的x和y值都是0，从图中我们可以观察和推导出：

• view.bounds的x值增加，所有的子视图会向左跑
• view.bounds的x值减少，所有的子视图会向右跑
• view.bounds的y值增加，所有的子视图会向上跑
• view.bounds的y值减少，所有的子视图会向下跑
  
  2.2 上面示例的代码实现

//
//  viewController.swift
//  Bounds&Frame
//
//  Created by macvivi on 2020/5/23.
//  Copyright © 2020 macvivi. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
    var yellowView:UIView?
    var greenView:UIView?
    var redView:UIView?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
         setupUI();
    }
    
    
    func setupUI(){
        
        yellowView = UIView.init(frame: CGRect(x: 0, y: 44, width: 350, height: 600));
        yellowView?.backgroundColor = UIColor.yellow;
        view.addSubview(yellowView ?? view);
        
        greenView = UIView.init(frame: CGRect(x: 100, y: 100, width: 200, height: 250))
        greenView?.backgroundColor = UIColor.green
        yellowView?.addSubview(greenView ?? view);
        
        redView = UIView.init(frame: CGRect(x: 50, y: 50, width: 100, height: 100));
        redView?.backgroundColor = UIColor.red
        greenView?.addSubview(redView ?? view)
        
        let blueView = UIView.init(frame: CGRect(x: 80, y: 400, width: 100, height: 100));
        blueView.backgroundColor = UIColor.blue;
        yellowView?.addSubview(blueView)
        
        
        let btn =  UIButton.init(type: .system)
        btn.frame = CGRect(x: 150, y: 400, width: 200, height: 30);
        btn.setTitle("绿图bounds的y加100", for: .normal);
        view.addSubview(btn);
        
        let btn1 = UIButton.init(type: .system);
        btn1.frame = CGRect(x: 150, y: 500, width: 200, height: 30);
        btn1.setTitle("还原", for: .normal);
        view.addSubview(btn1);
        
        let btn2 = UIButton.init(type: .system);
        btn2.frame = CGRect(x: 150, y: 600, width: 200, height: 30);
        btn2.setTitle("黄图bounds的x和y都加50", for: .normal);
        view.addSubview(btn2);
        
        
        btn.addTarget(self, action: #selector(btnClick(btn:)), for: .touchUpInside);
        btn1.addTarget(self, action: #selector(restore(btn:)), for: .touchUpInside);
        btn2.addTarget(self, action: #selector(allAdd), for: .touchUpInside)
    }
    
    
    @objc func restore(btn:UIButton){
        greenView?.bounds = CGRect(x: 0, y: 0, width: 200, height: 250);
        yellowView?.bounds = CGRect(x: 0, y: 0, width: 350, height: 600);
    }
    
    
    @objc func btnClick(btn:UIButton){
        greenView?.bounds = CGRect(x: 0, y: 100, width: 200, height: 250);
        
    }
    

    @objc func allAdd(){
        yellowView?.bounds = CGRect(x: 50, y: 50, width: 350, height: 600);
    }
    
}