[英]UIActivityIndicatorView in a UITableViewController
[英]How to show an UIActivityIndicatorView whitin UITableViewController?
我是iOS开发的初学者,并且遇到有关如何显示UIActivityIndicatorView的问题。
这是我的结构:
我有一个UITabBarController作为根VC。 在第一本指南的TabBarController内部,我有一个UITableViewController在TableView内部,我执行了REST请求(此刻是假请求)。
我想要的是?
启动应用程序时,将加载TableView并完成请求。 进行申请后,我想显示UIActivityIndicatorView。
我的问题是显示此ActivityIndicatorView :(
我的密码
MainViewController(根VC)
import UIKit
class MainViewController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
setupTabBarItems()
}
private func setupTabBarItems() {
let items: [String] = ["Home", "Carrinho", "Categorias", "Conta"]
let homeVC = HomeTableViewController()
let carrinhoVC = UIViewController()
let categoriasVC = UIViewController()
let contaVC = UIViewController()
let tabBarList = [homeVC, carrinhoVC, categoriasVC, contaVC]
for i in 0..<4 {
tabBarList[i].tabBarItem = UITabBarItem(title: items[i], image: UIImage(named: items[i]), selectedImage: UIImage(named: items[i]))
}
viewControllers = tabBarList
}
}
HomeTableViewController(表视图)
import UIKit
class HomeTableViewController: UITableViewController {
let progressView: UIActivityIndicatorView = {
let p = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.whiteLarge)
p.backgroundColor = .black
p.translatesAutoresizingMaskIntoConstraints = false
p.startAnimating()
return p
}()
override func viewDidLoad() {
super.viewDidLoad()
// **the method is called here**
setupIndicatorView()
/* others methods */
}
private func setupIndicatorView() {
guard let window = UIApplication.shared.keyWindow else {return}
window.addSubview(progressView)
window.bringSubview(toFront: progressView)
// function to add constraints (is an extension of UIView)
window.constraint(pattern: "H:|[v0]|", views: progressView)
window.constraint(pattern: "V:|[v0]|", views: progressView)
}
/* other methods */
有什么建议么?
将progressView直接添加到tableView中:
private func setupIndicatorView() {
self.view.addSubview(progressView)
progressView.center = self.view.center // or instead use autolayout if you prefer it
}
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