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//
// ViewController.swift
// Annotations
//
// Created by 宋宋 on 18/09/2016.
// Copyright © 2016 DianQK. All rights reserved.
//
import UIKit
import RxSwift
import RxCocoa
class ViewController: UIViewController {
lazy var moveView: UIView = {
let view = UIView()
view.backgroundColor = UIColor.blue
view.frame = CGRect(x: 100, y: 100, width: 60, height: 60)
return view
}()
let points: [CGPoint] = [
CGPoint(x: 50, y: 120),
CGPoint(x: 150, y: 200),
CGPoint(x: 150, y: 350),
CGPoint(x: 100, y: 450),
CGPoint(x: 230, y: 500),
CGPoint(x: 300, y: 200)
]
var pointViews: [UIView] = []
private let disposeBag = DisposeBag()
override func viewDidLoad() {
super.viewDidLoad()
let views = points.enumerated()
.map { index, point -> UIView in
let view = UILabel()
view.text = String(index)
view.textColor = UIColor.white
view.backgroundColor = UIColor.black
view.frame = CGRect(origin: point, size: CGSize(width: 30, height: 30))
return view
}
views.forEach(view.addSubview)
pointViews = views
moveView.isUserInteractionEnabled = true
view.isUserInteractionEnabled = true
let ges = UIPanGestureRecognizer()
view.addSubview(moveView)
view.addGestureRecognizer(ges)
let movedPoint = ges.rx.event
.flatMap { ges -> Observable<CGPoint> in
switch ges.state {
case .changed:
return Observable.just(ges.location(in: ges.view))
default:
return Observable.empty()
}
}
.shareReplay(1)
movedPoint
.subscribe(onNext: { point in
self.moveView.frame.origin = point
})
.addDisposableTo(disposeBag)
let nextIndex = movedPoint
.scan((nextIndex: 0, points: points)) { acc, x in
if acc.nextIndex >= acc.points.count {
return (nextIndex: acc.nextIndex + 1, points: acc.points)
}
if x.distance(acc.points[acc.nextIndex]) < 20 {
return (nextIndex: acc.nextIndex + 1, points: acc.points)
} else {
return acc
}
}
.takeWhile { acc in
acc.nextIndex <= acc.points.count
}
.map { $0.nextIndex }
.startWith(0)
.distinctUntilChanged()
.shareReplay(1)
nextIndex
.map { $0 - 1 }
.filter { $0 >= 0 }
.subscribe(onNext: { nextIndex in
let view = views[nextIndex]
view.backgroundColor = UIColor.blue
} , onCompleted: {
UIView.animate(withDuration: 0.6, animations: {
self.moveView.alpha = 0
})
})
.addDisposableTo(disposeBag)
// .subscribe(onNext: { index in
// print(index)
// }, onCompleted: {
// print("Completed")
// })
// .addDisposableTo(disposeBag)
}
}
extension CGPoint {
func distance(_ point: CGPoint) -> CGFloat {
let offsetX = point.x - x
let offsetY = point.y - y
return sqrt(offsetX * offsetX + offsetY * offsetY)
}
}
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