向 UITableView 添加页脚

Question

因此，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：（当然我是在viewDidLoad()里面执行这个函数）

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: terminating with uncaught exception of type NSException *** Terminating app due to uncaught exception 'NSGenericException', reason: 'Unable to activate constraint with anchors <NSLayoutXAxisAnchor:0x282fa0640 "UIStackView:0x108022090.left"> and <NSLayoutXAxisAnchor:0x282f56400 "UIView:0x108020ec0.left"> because they have no common ancestor. Does the constraint or its anchors reference items in different view hierarchies? That's illegal.' terminating with uncaught exception of type NSException

我不习惯以编程方式设置约束，所以我很难解决这个问题。请帮忙！

Answer 1

首先将页脚添加到 uitableView，然后添加约束

100% 成功测试

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) ])

向 UITableView 添加页脚

Adding footer to UITableView

constraints

ios

autolayout

swift