向 UITableView 添加页脚

Question

所以，我制作了一个带有自定义单元格（.xib 文件）的 UITableView，效果很好。问题是我现在想添加一个页脚，它需要一个 UIImageView 和一个 UILabel。

这就是我目前正在做的事情：（当然我在 viewDidLoad() 中执行这个函数）

private func setupTableViewFooter() {
        /// Insight Logo
        let myAppLogo = UIImageView()
        myAppLogo.backgroundColor = .clear
        myAppLogo.widthAnchor.constraint(equalToConstant: 110.0).isActive = true
        myAppLogo.heightAnchor.constraint(equalToConstant: 60.0).isActive = true
        myAppLogo.contentMode = .scaleAspectFit
        myAppLogo.image = UIImage(named: "myAppLogo")
        
        /// Description Label
        let label = UILabel()
        label.backgroundColor = .clear
        label.widthAnchor.constraint(equalToConstant: self.view.frame.size.width - 60).isActive = true
        label.heightAnchor.constraint(equalToConstant: 30.0).isActive = true
        label.textAlignment = .left
        label.textColor = K.Colors.black
        label.font = UIFont(name: "Roboto-Medium", size: 13)
        label.text = "Hello world!"
        
        /// Stack View
        let footer = UIStackView()
        footer.axis = .vertical
        footer.distribution = .fill
        footer.alignment = .leading
        footer.spacing = 00.0
        footer.backgroundColor = .lightGray
        
        footer.addArrangedSubview(myAppLogo)
        footer.addArrangedSubview(label)
        footer.translatesAutoresizingMaskIntoConstraints = false
        
        NSLayoutConstraint.activate([
            footer.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 30),
            footer.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -30),
            footer.widthAnchor.constraint(equalTo: view.widthAnchor, constant: -60),
            footer.heightAnchor.constraint(equalToConstant: 90)
        ])
        
        self.tableView.tableFooterView = footer
    }

我收到此错误：

libc++abi.dylib：以 NSException 类型的未捕获异常终止 *** 由于未捕获的异常“NSGenericException”而终止应用程序，原因：“无法使用锚点激活约束 <0x282fa0640><0x282f56400>

Answer 1

首先将fotter添加到tableView然后添加Constraints

100% 正常测试

self.tableView.tableFooterView = footer

NSLayoutConstraint.activate([ footer.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 30), footer.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -30), footer.widthAnchor.constraint(equalTo: view.widthAnchor, constant: -60), footer.heightAnchor.constraint(equalToConstant: 90) ])