SwiftUI中使用UITextView（可分行）和UITextField

在swiftUI中目前只有textField使用，没法分行，中文输入也有问题这个我就不说了，然后没法监听输入内容，当然你可以写一个binding可是实现，网上找的分行输入不是插入输入有问题就是删除有问题。下面开始
首先新建一个文件

import SwiftUI
import UIKit

struct MyTextField: UIViewRepresentable {
   
    func makeUIView(context: Context) -> UITextField {
        
       
    }
    
    func updateUIView(_ uiView: UITextField, context: Context) {
      
    }

}

这是基本，然后写我们需要自定义的值

struct MyTextField: UIViewRepresentable {
    let keyboardType: UIKeyboardType
    @Binding var text: String
    @State var placeholder : String
    var paddingHor:CGFloat = 10
func makeUIView(context: Context) -> UITextField {
        
        
        let textField = UITextField(frame: .zero)
        textField.keyboardType = self.keyboardType
        textField.delegate = context.coordinator
        
        textField.text = self.text
        
        textField.returnKeyType = UIReturnKeyType.done
        textField.backgroundColor = .white
        textField.placeholder = placeholder
        
        textField.leftView = UIView(frame: CGRect(x: 0, y: 0, width: paddingHor, height: 1));
        textField.leftViewMode = .always
        
        return textField
    }
}

以上就已经完成uitextView，然后设置代理，和其他的优化设置

struct MyTextField: UIViewRepresentable {
    let keyboardType: UIKeyboardType
    @Binding var text: String
    @State var placeholder : String
    var paddingHor:CGFloat = 10
    func makeUIView(context: Context) -> UITextField {
        
        
        let textField = UITextField(frame: .zero)
        textField.keyboardType = self.keyboardType
        textField.delegate = context.coordinator
        
        textField.text = self.text
        
        textField.returnKeyType = UIReturnKeyType.done
        textField.backgroundColor = .white
        textField.placeholder = placeholder
        
        textField.leftView = UIView(frame: CGRect(x: 0, y: 0, width: paddingHor, height: 1));
        textField.leftViewMode = .always
        
        return textField
    }
    
    func updateUIView(_ uiView: UITextField, context: Context) {
        DispatchQueue.main.async{
        self.$text.wrappedValue = uiView.text!
       
        }
    }
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self,text: self.$text)
    }
    
    
    class Coordinator: NSObject, UITextFieldDelegate {
        var parent: MyTextField
        var text: Binding<String>
        init(_ textField: MyTextField,text:Binding<String>) {
            self.parent = textField
            self.text = text
        }
        
        func textFieldShouldReturn(_ textField: UITextField) -> Bool {
            //收起键盘
            textField.resignFirstResponder()
           
            self.text.wrappedValue = textField.text!
            
           
            return true
        }
        
        //结束编辑
        func textFieldDidEndEditing(_ textField: UITextField) {
         
             self.text.wrappedValue = textField.text!
             print("结束")
        }
        
         //开始编辑
        func textFieldDidBeginEditing(_ textField: UITextField) {
        
           
            print("开始")
        }
        //这里是监听输入，这里的string是最新的输入数据，可实现像微信那样的@人的功能
        func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
            self.text.wrappedValue = string

//比如这样实现@弹窗
        //if string == "@"{
                //self.showact.wrappedValue.toggle()
               
           // }
            return true
           
        }
    }
}

下面的是UITextView的方法

struct TextViewTyped: UIViewRepresentable {
    
    let keyboardType: UIKeyboardType
    @Binding var text: String
    @Binding var endEdit:Bool
    
    func makeUIView(context: Context) -> UITextView {
       
        
        let textView = UITextView(frame: .zero)
        textView.keyboardType = self.keyboardType
        textView.delegate = context.coordinator
        textView.inputAccessoryView = .none
        textView.text = self.text
        textView.textColor = .black
        textView.returnKeyType = UIReturnKeyType.default
        textView.backgroundColor = .white
        
        return textView
    }
    
    func updateUIView(_ uiView: UITextView, context: Context) {
        DispatchQueue.main.async {
              self.$text.wrappedValue = uiView.text!
            
            //自动弹键盘
            if uiView.window != nil, !uiView.isFirstResponder {
                uiView.becomeFirstResponder()
            }
            
            if self.endEdit == true {
                uiView.resignFirstResponder()
            }
            
        }
        
    }
   
    func makeCoordinator() -> Coordinator {
        Coordinator(self,text: self.$text)
    }
    
    
    
    class Coordinator: NSObject, UITextViewDelegate {
        var parent: TextViewTyped
       
        var text: Binding<String>
        
        init(_ textView: TextViewTyped,text:Binding<String>) {
            self.parent = textView
          
            self.text = text
           
            
        }
        
        
        
//        func textFieldShouldReturn(_ textView: UITextField) -> Bool {
//            //收起键盘
//            textView.resignFirstResponder()
//
//            self.text.wrappedValue = textView.text!
//
//
//            return true
//        }
        
    
        
       
        //结束编辑
        func textViewDidEndEditing(_ textView: UITextView) {
            textView.resignFirstResponder()
        }
        
         //开始编辑
        
        func textViewDidBeginEditing(_ textView: UITextView) {
            
        }
        
        
        
        
        func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
            self.text.wrappedValue = text
            
            
            //print(text)
            
           
            
            return true
        }
        
        
    }
}

无论是哪种都需要在updateView中实现获取获取值，这样才能获取正确的值
当然这样也达不到弹不起键盘，想要实现输入发布挡住输入内容还得写其他方法