效果图如下：
悬浮按钮
一个iOS上的悬浮按钮，实现方式是写一个自定义类继承自UIButton ，重写3个方法: touchesBegan, touchesMoved, touchesEnded ，项目中的需求是监听按钮的单击和双击事件。
以下给出源代码 swift3实现：
AllFloatButton.swift
import UIKit
// 声明协议
protocol FloatDelegate {
func singleClick()
func repeatClick()
}
class AllFloatButton: UIButton {
// 是否可拖拽
var isDragEnable: Bool = true
// 拖拽后是否自动移到边缘
var isAbsortEnable: Bool = true
// 背景颜色
var bgColor: UIColor? = UIColor.red
// 正常情况下 透明度
var alphaOfNormol: CGFloat = 0.2
// 拖拽时的透明度
var alphaOfDrag: CGFloat = 0.8
// 圆角大小
var radiuOfButton: CGFloat = 12
// 拖拽结束后的等待时间
var timeOfWait: CGFloat = 1.5
// 拖拽结束后的过渡动画时间
var timeOfAnimation: CGFloat = 0.3
// 按钮距离边缘的内边距
var paddingOfbutton: CGFloat = 2
// 代理
var delegate: FloatDelegate? = nil
// 计时器
fileprivate var timer: Timer? = nil
// 内部使用 起到数据传递的作用
fileprivate var allPoint: CGPoint? = nil
// 内部使用
fileprivate var isHasMove: Bool = false
fileprivate var isFirstClick: Bool = true
override init(frame: CGRect) {
super.init(frame: frame)
self.backgroundColor = self.bgColor
self.alpha = self.alphaOfNormol
self.layer.cornerRadius = self.radiuOfButton
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func touchesBegan(_ touches: Set, with event: UIEvent?) {
self.alpha = self.alphaOfDrag
// 计时器取消
self.timer?.invalidate()
// 不可拖拽则退出执行
if !isDragEnable {
return
}
self.allPoint = touches.first?.location(in: self)
if touches.first?.tapCount == 1 {
self.perform(#selector(singleClick), with: nil, afterDelay: 0.2)
} else if touches.first?.tapCount == 2 {
self.perform(#selector(repeatClick))
}
}
override func touchesMoved(_ touches: Set, with event: UIEvent?) {
self.isHasMove = true
if self.isFirstClick {
NSObject.cancelPreviousPerformRequests(withTarget: self, selector: #selector(singleClick), object: nil)
self.isFirstClick = false
}
if !isDragEnable {
return
}
let temp = touches.first?.location(in: self)
// 计算偏移量
let offsetx = (temp?.x)! - (self.allPoint?.x)!
let offsety = (temp?.y)! - (self.allPoint?.y)!
self.center = CGPoint.init(x: self.center.x + offsetx, y: self.center.y + offsety)
}
override func touchesEnded(_ touches: Set, with event: UIEvent?) {
self.isFirstClick = true
self.timer = Timer.init(timeInterval: TimeInterval(self.timeOfWait), repeats: false, block: { (Timer) in
// 过渡
UIView.animate(withDuration: TimeInterval(self.timeOfAnimation), animations: {
self.alpha = self.alphaOfNormol
})
})
// 这段代码只有在按钮移动后才需要执行
if self.isHasMove && isAbsortEnable && self.superview != nil {
// 移到父view边缘
let marginL = self.frame.origin.x
let marginT = self.frame.origin.y
let superFrame = self.superview?.frame
let tempy = (superFrame?.height)! - 2 * self.frame.height - self.paddingOfbutton
let tempx = (superFrame?.width)! - self.frame.width - self.paddingOfbutton
let xOfR = (superFrame?.width)! - self.frame.width - self.paddingOfbutton
UIView.animate(withDuration: 0.2, animations: {
var x = self.frame.origin.x
if marginT < self.frame.height + self.paddingOfbutton {
// 靠顶部
if x > tempx {
x = tempx
}
if x < self.paddingOfbutton {
x = self.paddingOfbutton
}
self.frame = CGRect.init(x: x, y: self.paddingOfbutton, width: self.frame.width, height: self.frame.height)
} else if marginT > tempy {
// 靠底部
if x > tempx {
x = tempx
}
if x < self.paddingOfbutton {
x = self.paddingOfbutton
}
let y = tempy + self.frame.height
self.frame = CGRect.init(x: x, y: y, width: self.frame.width, height: self.frame.height)
} else if marginL > ((superFrame?.width)! / 2) {
// 靠右移动
self.frame = CGRect.init(x: xOfR, y: marginT, width: self.frame.width, height: self.frame.height)
} else {
// 靠左移动
self.frame = CGRect.init(x: self.paddingOfbutton, y: marginT, width: self.frame.width, height: self.frame.height)
}
})
}
self.isHasMove = false
// 将计时器加入runloop
if let temptime = self.timer {
RunLoop.current.add(temptime, forMode: .commonModes)
}
}
func singleClick() {
self.delegate?.singleClick()
}
func repeatClick() {
NSObject.cancelPreviousPerformRequests(withTarget: self, selector: #selector(singleClick), object: nil)
self.delegate?.repeatClick()
}
}
代理对象实现协议，执行代理方法：
ViewController.swift：
import UIKit
class ViewController: UIViewController, FloatDelegate {
override func viewDidLoad() {
super.viewDidLoad()
let frame = CGRect.init(x: 3, y: 100, width: 60, height: 60)
let allbutton = AllFloatButton.init(frame: frame)
allbutton.delegate = self
self.view.addSubview(allbutton)
let frame2 = CGRect.init(x: 3, y: 300, width: 60, height: 60)
let allbutton2 = AllFloatButton.init(frame: frame2)
// 拖拽后不能回到边缘
allbutton2.isAbsortEnable = false
allbutton2.backgroundColor = UIColor.black
self.view.addSubview(allbutton2)
}
// 实现代理方法
func singleClick() {
print("单击")
}
func repeatClick() {
print("双击")
}
}