TuanCanAPP_iOS1.0/ADHTuanCan/Class/Category/Proxy多重代理/MCProxyTextViewRx.swift

//
//  MCProxyTextViewRx.swift
//  HCQuanfangtong
//
//  Created by Apple on 2022/4/11.
//  Copyright © 2022 Jyp. All rights reserved.
//

import Foundation
import RxSwift
import RxCocoa
/// 自动注入
@propertyWrapper class TextViewWrapper{
    
    var defaultValue : UITextView?
    
    /// 字数限制label
    weak var limitLabel : UILabel?
    
    /// 最大长度
    var maxLength : Int
    
    /// 输入结束事件
    var endBlock : ()->Void
    
    
    let disposeAutoRelease = DisposeBag()
    var wrappedValue : UITextView?{
        didSet{
            wrappedValue?.rx.bindDelegate(delegate: MCTextViewDelegate.init(maxLength: maxLength, limitLabel: limitLabel, endBlock: endBlock)).subscribe().disposed(by: disposeAutoRelease)
        }
    }
    
    init(wrappedValue defaultValue: UITextView? = nil, maxLength: Int, limitLabel: UILabel? = nil, endBlock: @escaping ()->Void){
        self.defaultValue = defaultValue
        self.maxLength = maxLength
        self.limitLabel = limitLabel
        self.endBlock = endBlock
    }
    
    
}

class MCTextViewDelegate : NSObject, UITextViewDelegate{
    
    /// 最大长度
    var maxLength : Int
    
    /// 字数限制label
    weak var limitLabel : UILabel?
    
    /// 输入结束事件
    var endBlock : ()->Void
    
    
    func textViewDidChangeSelection(_ textView: UITextView) {
        let toBeString = textView.text;
        let lang = textView.textInputMode?.primaryLanguage
            if lang == "zh-Hans"{
            let textRange = textView.markedTextRange
            if let range = textRange{
                if textView.position(from: range.start, offset: 0) != nil{
                    return
                }
            }
        }
        if toBeString?.count ?? 0 > maxLength{
            let text = toBeString?.prefix(maxLength)
            textView.text = String(text ?? "")
        }
        limitLabel?.text = "\(textView.text.count)/\(maxLength)"
    }
    
    func textViewDidEndEditing(_ textView: UITextView){
        self.endBlock()
    }
    
    
    init(maxLength: Int, limitLabel: UILabel? = nil, endBlock: @escaping ()->Void) {
        self.maxLength = maxLength
        self.limitLabel = limitLabel
        self.endBlock = endBlock
    }
    
}



extension Reactive where Base:UITextView{
    var textDelegate : DelegateProxy<UITextView, UITextViewDelegate>{
        return TextViewDelegateProxy.proxy(for: base)
    }
    
    func bindDelegate(delegate:UITextViewDelegate)->RxSwift.Observable<[Any]>{
        self.base.delegate = delegate
        return textDelegate.methodInvoked(#selector(UITextViewDelegate.textViewDidChangeSelection(_:)))
    }
    
}



public class TextViewDelegateProxy : DelegateProxy<UITextView, UITextViewDelegate>,UITextViewDelegate,DelegateProxyType{
    
    public weak private(set) var textView : UITextView?
    
    init(textView: UITextView) {
        self.textView = textView
        super.init(parentObject: textView, delegateProxy: TextViewDelegateProxy.self)
    }
    public static func registerKnownImplementations() {
        self.register {
            TextViewDelegateProxy.init(textView: $0)
        }
    }
    
    public static func currentDelegate(for object: UITextView) -> UITextViewDelegate? {
        return object.delegate
    }
    
    public static func setCurrentDelegate(_ delegate: UITextViewDelegate?, to object: UITextView) {
        object.delegate = delegate
    }
    
    public override func setForwardToDelegate(_ delegate: DelegateProxy<UITextView, UITextViewDelegate>.Delegate?, retainDelegate: Bool) {
        super.setForwardToDelegate(delegate, retainDelegate: true)
    }

   
    
}