如何在智能合约中接收ETH

Question

我正在开发一个 ICO，我得到了这个代码，众筹是使用 dai 代币，但我想使用以太币， 我该怎么做？

IERC20 public dai = IERC20(0x6B175474E89094C44Da98b954EedeAC495271d0F);
function buy(uint etherAmount)
    external
    icoActive() {
    require(
      etherAmount >= minPurchase && etherAmount <= maxPurchase, 
      'have to buy between minPurchase and maxPurchase'
    );
    uint tokenAmount = etherAmount.div(price);
    
    require(
      tokenAmount <= availableTokens, 
      'Not enough tokens left for sale'
    );
    dai.transferFrom(msg.sender, address(this), etherAmount);
    token.mint(address(this), tokenAmount);
    sales[msg.sender] = Sale(
        msg.sender,
        tokenAmount,
        false
    );
}

Answer 1

您可以使用

payable

函数修饰符。请参阅文档如何在智能合约中接收以太币。

Answer 2

您需要有 receive() 回调函数才能在智能合约中接收 ETH。

将此功能添加到您的智能合约中。

receive() 外部应付{}