iOS 吸附悬浮按钮实现

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发布时间：2022-06-02

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技术：iOS+Swfit

运行环境：Xcode+Swift

概述

实现了按钮吸附在屏幕左右两侧效果

详细

> 实现按钮吸附在屏幕左右两侧效果
### 效果图
![](/contentImages/image/20220525/sut2baZ1x51vGsGIjNu.gif)

### 代码
```
import UIKit

class HoverView: UIView {
    /// 屏幕宽度
    private var screenW: CGFloat = UIScreen.main.bounds.size.width
    /// 屏幕高度
    private var screenH: CGFloat = UIScreen.main.bounds.size.height
    /// 悬浮view 大小
    private let size: CGSize = CGSize(width: 100, height: 100)
    /// 顶部最小 margin
    private let topMinMargin: CGFloat = 88
    /// 底部最小 margin
    private let bottomMinMargin: CGFloat = 88
    /// 左边最小 margin
    private let leftMinMargin: CGFloat = 20
    /// 右边最小 magin
    private let rightMinMargin: CGFloat = 20
    /// 拖动开始时 位置
    private var beginPoint: CGPoint = .zero
    
    /// 点击开始
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesBegan(touches, with: event)
        guard let touch = touches.first else {return}
        
        let curPoint = touch.location(in: self)
        let prePoint = touch.previousLocation(in: self)
        
        let offsetX = curPoint.x - prePoint.x
        let offsetY = curPoint.y - prePoint.y
        
        let centerX = offsetX + self.center.x
        let centerY = offsetY + self.center.y
        /// 记录开始位置
        beginPoint = CGPoint(x: centerX, y: centerY)
        
    }
    /// 拖动
    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesMoved(touches, with: event)
        guard let touch = touches.first else {return}
        
        let curPoint = touch.location(in: self)
        let prePoint = touch.previousLocation(in: self)
        
        let offsetX = curPoint.x - prePoint.x
        let offsetY = curPoint.y - prePoint.y
        
        let centerX = offsetX + self.center.x
        let centerY = offsetY + self.center.y
        /// 拖动
        self.center = CGPoint(x: centerX, y: centerY)
    
    }
    /// 点击结束
    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesEnded(touches, with: event)
        guard let touch = touches.first else {return}
        let curPoint = touch.location(in: self)
        let prePoint = touch.previousLocation(in: self)
        
        let offsetX = curPoint.x - prePoint.x
        let offsetY = curPoint.y - prePoint.y
        
        let centerX = offsetX + self.center.x
        let centerY = offsetY + self.center.y
        
        let endPoint = CGPoint(x: centerX, y: centerY)
        /// 区分点击和拖动
        if endPoint == beginPoint { /// 点击
            // TODO: 处理点击事件
        } else { /// 拖动
            correctLocation()
        }
    }
    /// 修正位置 动画吸附在屏幕两侧
    func correctLocation() {
    
        var endCenter = center
        endCenter.x = center.x > screenW * 0.5 ? screenW-(rightMinMargin + size.width * 0.5) : (leftMinMargin + size.width * 0.5)
    
        if center.y < (topMinMargin + size.height * 0.5) {
            endCenter.y = (topMinMargin + size.height * 0.5)
        } else if center.y > screenH - (bottomMinMargin + size.height * 0.5) {
            endCenter.y = screenH - (bottomMinMargin + size.height * 0.5)
        }
        UIView.animate(withDuration: 0.25) {
            self.center = endCenter
        }
        
    }
    func setSubView() {
        self.backgroundColor = .red
    }
    
    init() {
        
        super.init(frame: CGRect(x: 0, y: 0, width: size.width, height: size.height))
        setSubView()
    }
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}
```
### 代码结构图
本项目只有一个源码文件，如下：

![](/contentImages/image/20220531/ZexoJnSp7ZJYfoIsAX6.png)

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iOS 吸附悬浮按钮实现

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