页眉部分视图中的标签和按钮 UITableView

Question

我正在尝试在标题部分视图中添加部分标题标签和按钮。 但它看起来是空的。 当我运行应用程序时，标头为空。 第二部分代码工作正常

override func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
if (section == 0){
let label = UILabel.init(frame: CGRect.init(x: 17, y: 139, width: tableView.frame.size.width, height: 45))
label.textColor = UIColor.black
label.font = UIFont.systemFont(ofSize: 13.0)
label.textAlignment = .left
label.text = "   My Balances"
label.backgroundColor  = UIColor(red: 0.95, green: 0.95, blue: 0.95, alpha: 1.00)

let frame = tableView.frame
let height:CGFloat = 66
let button = UIButton(frame: CGRect(x: 306, y: 139, width: 15, height: 15))  // create button
button.tag = section
// the button is image - set image
button.setImage(UIImage(named: "remove_button"), for: .normal)
let headerView = UIView(frame: CGRect(x: 0, y: 0, width: frame.size.width, height: height))  // create custom view
headerView.addSubview(button)   // add the button to the view
headerView.addSubview(label)
return headerView
//return label

//return label

}
else {
let label = UILabel.init(frame: CGRect.init(x: 0, y: 241, width: tableView.frame.size.width, height: 45))
label.textColor = UIColor.black
label.font = UIFont.systemFont(ofSize: 13.0)
label.textAlignment = .left
label.text = "   My Customers"
label.backgroundColor  = UIColor(red: 0.95, green: 0.95, blue: 0.95, alpha: 1.00)

return label
}
}

Answer 1

你没有遵循正确的方法。首先，您必须使用表视图viewDidLoad()对象中的heightForHeaderInSection设置标题视图的高度，例如 -

tableView.heightForHeaderInSection = 250 

或使用其委托方法 -

func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
return 250
}

将标题视图的高度设置为等于表视图高度。将其设置为小于let height:CGFloat = 250-

override func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {

let label = UILabel.init(frame: CGRect.init(x: 0, y: 241, width: tableView.frame.size.width, height: 45))
label.textColor = UIColor.black
label.font = UIFont.systemFont(ofSize: 13.0)
label.textAlignment = .left
label.text = "   My Balances"
label.backgroundColor  = UIColor(red: 0.95, green: 0.95, blue: 0.95, alpha: 1.00)

let frame = tableView.frame
let height:CGFloat = 250 
let button = UIButton(frame: CGRect(x: 5, y: 10, width: 15, height: 15))  // create button
button.tag = section
// the button is image - set image
button.setImage(UIImage(named: "remove_button"), for: .normal)
let headerView = UIView(frame: CGRect(x: 0, y: 0, width: frame.size.width, height: height))  // create custom view
headerView.addSubview(button)   // add the button to the view
headerView.addSubview(label)
return headerView
//return label

}

或者另一种方法是创建自定义可重用的标题视图，注册为标题视图，最后将其取消。

您可以按照Apple的文档进行第二种方式 - https://developer.apple.com/documentation/uikit/views_and_controls/table_views/adding_headers_and_footers_to_table_sections