iOS 应用程序中的点赞按钮

iOS 应用程序中的点赞按钮

swift
import UIKit
class LikeButton: UIButton {
    var isLiked = false
    var likeCount = 0
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupButton()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setupButton()
    }
    
    func setupButton() {
        // 设置未点赞状态的图标
        setImage(UIImage(named: "like"), for: .normal)
        // 设置已点赞状态的图标
        setImage(UIImage(named: "like_filled"), for: .selected)
        // 添加点击事件
        addTarget(self, action: #selector(likeButtonTapped), for: .touchUpInside)
    }
    
    @objc func likeButtonTapped() {
        isLiked = !isLiked
        // 切换按钮状态
        isSelected = isLiked
        // 根据按钮状态增减点赞数量
        likeCount += isLiked ? 1 : -1
    }
}