RxSwift学习之旅 - RxGesture

简介
RxGesture是RxSwift社区的产物，是对view手势的封装。

项目地址:RxGesture

话不多说，直接来看它的用法吧。

点击

tapView.rx
    .tapGesture()
    .when(.recognized)
    .subscribe(
        onNext:{
            _ in
            print("tapped!!!")
        }
    )
    .disposed(by: disposeBag)

双击

tapView.rx
    .tapGesture(numberOfTapsRequired: 2)
    .when(.recognized)
    .subscribe(
        onNext:{
            _ in
            print("double tapped!!!")
        }
    )
    .disposed(by: disposeBag)

下划

tapView.rx
    .swipeGesture(.down)
    .when(.recognized)
    .subscribe(
        onNext:{
            _ in
            print("swipe down!!!")
        }
    )
    .disposed(by: disposeBag)

水平划动

tapView.rx
    .swipeGesture([.left, .right])
    .when(.recognized)
    .subscribe(
        onNext:{
            _ in
            print("swipe left or right!!!")
        }
    )
    .disposed(by: disposeBag)

长按

tapView.rx
    .longPressGesture()
    .when(.began)
    .subscribe(
        onNext:{
            _ in
            print("long press")
        }
    )
    .disposed(by: disposeBag)

拖动

let panGesture = tapView.rx.panGesture().shareReplay(1)
        
panGesture
    .when(.changed)
    .asTranslation()
    .subscribe(
        onNext: {
            [unowned self] translation, _ in
            self.label.text = String(format: "(%.2f, %.2f)",translation.x, translation.y)
            self.tapView.transform = CGAffineTransform(translationX: translation.x, y: translation.y)
        }
    )
    .disposed(by: disposeBag)
panGesture
    .when(.ended)
    .subscribe(
        onNext: { _ in
            print("panGesture end")
        }
    )
    .disposed(by: disposeBag)

旋转

let rotationGesture = tapView.rx.rotationGesture().shareReplay(1)
        
rotationGesture
    .when(.changed)
    .asRotation()
    .subscribe(
        onNext: {
            [unowned self] rotation, _ in
            self.label.text = String(format: "%.2f rad", rotation)
            self.tapView.transform = CGAffineTransform(rotationAngle: rotation)
        }
    )
    .disposed(by: disposeBag)
rotationGesture
    .when(.ended)
    .subscribe(
        onNext: { _ in
            print("rotationGesture end")
        }
    )
    .disposed(by: disposeBag)

缩放

let pinchGesture = view.rx.pinchGesture().shareReplay(1)
        
pinchGesture
    .when(.changed)
    .asScale()
    .subscribe(
        onNext: {
            [unowned self] scale, _ in
            self.label.text = String(format: "x%.2f", scale)
            self.tapView.transform = CGAffineTransform(scaleX: scale, y: scale)
        }
    )
    .disposed(by: disposeBag)
pinchGesture
    .when(.ended)
    .subscribe(
        onNext: { _ in
            print("pinchGesture end")
        }
    )
    .disposed(by: disposeBag)

变换

let transformGestures = view.rx.transformGestures().shareReplay(1)
        
transformGestures
    .when(.changed)
    .asTransform()
    .subscribe(
        onNext: {
            [unowned self] transform, _ in
            self.label.numberOfLines = 3
            self.label.text = String(format: "[%.2f, %.2f,\n%.2f, %.2f,\n%.2f, %.2f]", transform.a, transform.b, transform.c, transform.d, transform.tx, transform.ty)
            self.tapView.transform = transform
        }
    )
    .disposed(by: disposeBag)
transformGestures
    .when(.ended)
    .subscribe(
        onNext: {
            [unowned self] _ in
            self.label.numberOfLines = 1
            print("transformGestures end")
        }
    )
    .disposed(by: disposeBag)

屏幕边缘

view.rx
    .screenEdgePanGesture(edges: .right)
    .when(.recognized)
    .subscribe(
        onNext: {
            _ in
            print("right edge")
        }
    )
    .disposed(by: disposeBag)

组合

tapView.rx
    .anyGesture(.tap(), .swipe([.up, .down]))
    .when(.recognized)
    .subscribe(
        onNext: {
            _ in
            print("tap or up down")
        }
    ).disposed(by: disposeBag)

过滤
默认对手势是没有过滤的，所以你会收到初始化的第一个手势事件。

下面是几种手势对应的状态:


还可以组合不同条件的手势:

tapView.rx
    .anyGesture(
        (.tap(), when: .recognized),
        (.pan(), when: .ended)
    )
    .subscribe(onNext: { gesture in
        // Called whenever:
        // - a tap is recognized (state == .recognized)
        // - or a pan is ended (state == .ended)
        print("tap is recognized or pan is ended")
    })
    .disposed(by: disposeBag)

代码
代码见github:

RxSwiftRxGesture