iOS类似墙纸透视效果UIInterpolatingMotionEffect-优快云博客

本文链接：https://blog.youkuaiyun.com/u011063706/article/details/72972298

本文介绍如何使用UIInterpolatingMotionEffect实现一个随手机摇晃而摆动的视图。通过创建CLMotionView类并利用UIMotionEffectGroup组合动画效果，使视图在移动设备倾斜时产生动态偏移。

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在读MBProgressHUD时,发现有个叫做UIInterpolatingMotionEffect的效果,一直在用这个框架,还真没注意过有这种动画.

当你手机在摇晃的时候,那个遮罩是会上下左右摆动的.
效果实现起来也很简单.
创建了一个CLMotionView,代码如下:

import UIKit

class CLMotionView: UIView {

    override init(frame: CGRect) {
        super.init(frame: frame)
        //这个值如果设置的过大的话,View移动起来卡顿会比较严重.
        let effectOffset = 20.0
        let effectX = UIInterpolatingMotionEffect(keyPath: "center.x", type: .tiltAlongHorizontalAxis)
        let effectY = UIInterpolatingMotionEffect(keyPath: "center.y", type: .tiltAlongVerticalAxis)

        effectX.maximumRelativeValue = effectOffset
        effectX.minimumRelativeValue = -effectOffset

        effectY.maximumRelativeValue = effectOffset
        effectY.minimumRelativeValue = -effectOffset

        let group = UIMotionEffectGroup()
        group.motionEffects = [effectX, effectY]

        self.addMotionEffect(group)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

}

ViewController.swift代码如下:

import UIKit

class ViewController: UIViewController {

    private let mv: CLMotionView = CLMotionView()
    let sw = UIScreen.main.bounds.size.width
    let sh = UIScreen.main.bounds.size.height
    override func viewDidLoad() {
        super.viewDidLoad()
        let w = sw-20;
        let x = (sw-w)/2
        let y = (sh-w)/2
        mv.frame = CGRect(x: x, y: y, width: w, height: w)
        mv.backgroundColor = UIColor.red
        view.addSubview(mv)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}