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您好，感谢您阅读我的问题。

我正在尝试创建一个质押农场来学习 Solidity，我意识到这个农场允许用户质押他们的代币，然后我需要运行代码来发放他们的奖励，但我还需要自己支付 gas 费。

我想要做的是添加一个 Harvest 按钮，这样我就可以将奖励作为津贴发放，而无需将其发送给用户，这样他们就可以随时通过支付 gas 费来收获它们。任何提示表示赞赏。

pragma solidity ^0.5.0;


import "./DappToken.sol";
import "./DaiToken.sol";

contract TokenFarm {

    string public name = "Dapp Token Farm";
    address public owner;
    DappToken public dappToken;
    DaiToken public daiToken;

    address[] public stakers;
    mapping(address => uint) public stakingBalance;
    mapping(address => bool) public hasStaked;
    mapping(address => bool) public isStaking;

    constructor(DappToken _dappToken, DaiToken _daiToken) public {
        dappToken = _dappToken;
        daiToken = _daiToken;
        owner = msg.sender;
    }
    // 1. stakes tokens (deposit)
    function stakeTokens(uint _amount) public {

        require(_amount > 0, "amount cannot be 0");

        daiToken.transferFrom(msg.sender, address(this), _amount);

        stakingBalance[msg.sender] = stakingBalance[msg.sender] + _amount;

        if(!hasStaked[msg.sender]) {
            stakers.push(msg.sender);
        }

        isStaking[msg.sender] = true;
        hasStaked[msg.sender] = true;
    }

    // 2.issuing tokens

    function issueTokens() public {
        require(msg.sender == owner, "caller must be the owner");
        for (uint i=0; i<stakers.length; i++) {
            address recipient = stakers[i];
            uint balance = stakingBalance[recipient];
            if(balance > 0) {
                dappToken.transfer(recipient, balance);
            }
        }
    }

     // 3. unstake
    
    function unstakeTokens() public {
        uint balance = stakingBalance[msg.sender];
        require(balance > 0, "staking balance cannot be 0");

        daiToken.transfer(msg.sender, balance);
        stakingBalance[msg.sender] = 0;
        isStaking[msg.sender] = false;
    }
}
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