從我的合約呼叫 erc20 代幣合約時合約恢復

我有這個應該可以工作的基本契約，但是由於建構子中的批准呼叫，它一直在恢復，我還注意到我的契約中的 transferFrom 呼叫在手動批准後也失敗了，這可能是錯誤的。

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.4.22 <0.7.0;


interface IaToken {
   function balanceOf(address _user) external view returns (uint256);
   function redeem(uint256 _amount) external;
}

interface IERC20 {
   function totalSupply() external view returns(uint256);
   function balanceOf(address account) external view returns (uint256);
   function allowance(address owner, address spender) external view returns(uint256);
   function transfer(address recipient, uint256 amount) external view returns(bool);
   function approve(address spender, uint256 amount) external view returns(bool);
   function transferFrom(address sender, address recipient, uint256 amount) external view returns(bool);
}

interface IAaveLendingPool {
   function deposit(address _reserve, uint256 _amount, uint16 _referralCode) external;
}

contract AaveExample {
   IERC20 public dai = IERC20(0xFf795577d9AC8bD7D90Ee22b6C1703490b6512FD);
   IaToken public aToken = IaToken(0x58AD4cB396411B691A9AAb6F74545b2C5217FE6a);
   IAaveLendingPool public aaveLendingPool = IAaveLendingPool(0x580D4Fdc4BF8f9b5ae2fb9225D584fED4AD5375c);
   
   mapping(address => uint256) public userDepositedDai;
   
   constructor() public {
       dai.approve(address(0xB4bE310666D2f909789Fb1a2FD09a9bEB0Edd99D), type(uint256).max);
   }
   
   function userDepositDai(uint256 _amountInDai) external {
       userDepositedDai[msg.sender] = _amountInDai;
       require(dai.transferFrom(msg.sender, address(this), _amountInDai), "DAI Transfer failed!");
       aaveLendingPool.deposit(address(dai), _amountInDai, 0);
   }
   
   function userWithdrawDai(uint256 _amountInDai) external {
       require(userDepositedDai[msg.sender] >= _amountInDai, "You cannot withdraw more than deposited!");

       aToken.redeem(_amountInDai);
       require(dai.transferFrom(address(this), msg.sender, _amountInDai), "DAI Transfer failed!");
       
       userDepositedDai[msg.sender] = userDepositedDai[msg.sender] - _amountInDai;
   }
}

正如我在 Discord 中提到的 :)，問題出在 IERC20 界面中 - 它提到approve（和其他）作為視圖功能。

引用自：https://ethereum.stackexchange.com/questions/118404