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我是iOS開發的初學者,我有一個關於如何顯示UIActivityIndicatorView的問題。如何顯示UIAableViewController的UIActivityIndicatorView?
這是我的結構:
我有一個的UITabBarController爲根VC。我有一個UITableViewController 在TableView內部,我做了一個REST請求(此時是一個假申請)。
我想要什麼?
當我啓動應用程序時,TableView被加載並且請購已完成。 請求被創建時,我想顯示UIActivityIndicatorView。
我的問題是顯示此ActivityIndicatorView :(
我的代碼
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(表視圖)
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 */
有什麼建議嗎?