Rx实现自定义类Delegate
事情不多主要是讲讲Rx如何自定义代理，为啥要将这个只要是iOS中太多的delegate 话不多说我们先来代码
Rx方式通过自定义VIew通过代理实现点击获取点击位置
@objc
protocol MyViewProtocol {
@objc optional func myTouchBegan(point:CGPoint)
}
class MyView: UIView {
var delegate: MyViewProtocol?
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
super.touchesBegan(touches, with: event)
if delegate != nil {
delegate!.myTouchBegan?(point: touches.first!.location(in: self))
}
}
}
实现Rx扩展
extension MyView: HasDelegate {
public typealias Delegate = MyViewProtocol
}
class RxMyViewProxy: DelegateProxy<MyView, MyViewProtocol>, MyViewProtocol, DelegateProxyType {
static func setCurrentDelegate(_ delegate: MyViewProtocol?, to object: MyView) {
object.delegate = delegate
}
static func currentDelegate(for object: MyView) -> MyViewProtocol? {
return object.delegate
}
public weak var myView:MyView?
init(view: MyView) {
self.myView = view
super.init(parentObject: view, delegateProxy: RxMyViewProxy.self)
}
static func registerKnownImplementations() {
self.register {
return RxMyViewProxy(view: $0)
}
}
}
extension Reactive where Base: MyView {
var rxDelegate: RxMyViewProxy {
return RxMyViewProxy.proxy(for: self.base)
}
var touch:ControlEvent<CGPoint>{
let source = self.rxDelegate.methodInvoked(#selector( MyViewProtocol.myTouchBegan(point:) )).map { a in
return a[0] as! CGPoint
}
return ControlEvent(events: source)
}
}
调用
myView = MyView(frame: self.view.frame)
myView?.backgroundColor = UIColor.gray
self.view.addSubview(myView!)
myView?.rx.touch.subscribe(onNext: { point in
print(point)
}, onError: { (e:Error) in
}, onCompleted: {
}, onDisposed: {
})
避免了delegate是不是很方便啊
实现基本原理
rx这个方式通过自定义委托Proxy来实现，也就是代理的代理来实现
1 定义一个委托
继承于Rx定义的好的委托Proxy的模版 class RxMyViewProxy: DelegateProxy, MyViewProtocol, DelegateProxyType {}
分析：
DeleProxy 采用泛型的方式，同时限定了被委托的Target为MyView以及定的Protocol
与此同时作为代理的代理同时需要遵循限定的Protocol
通过DelegateProxyType限定一下代理的委托类型
2 让被代理的Target需要HasDelegate来表明对应的关联类型进行类型推导
extension MyView: HasDelegate {
public typealias Delegate = MyViewProtocol
}3 实现DelegateProxyType的静态fun 进行类注册和内部代理赋值与获取
static func setCurrentDelegate(_ delegate: MyViewProtocol?, to object: MyView) {
object.delegate = delegate
}
static func currentDelegate(for object: MyView) -> MyViewProtocol? {
return object.delegate
}
static func registerKnownImplementations() {
self.register {
return RxMyViewProxy(view: $0)
}
}
4 扩展Reactive实现cocoa UI类的rx扩展
extension Reactive where Base: MyView {
var rxDelegate: RxMyViewProxy {
return RxMyViewProxy.proxy(for: self.base)
}
var touch:ControlEvent<CGPoint>{
let source = self.rxDelegate.methodInvoked(#selector( MyViewProtocol.myTouchBegan(point:) )).map { a in
return a[0] as! CGPoint
}
return ControlEvent(events: source)
}
}本文参与 腾讯云自媒体同步曝光计划，分享自微信公众号。
原始发表：2020-05-11，如有侵权请联系 cloudcommunity@tencent.com 删除
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