Question

在主故事板上有一个带有按钮的视图控制器。还有一个Swift文件（Helper.swift）。

ViewController.swift文件：

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func openView(_ sender: UIButton) {
        pop_Up_A_View()
    }
}

Helper.swift文件：

import Foundation
import UIKit

func pop_Up_A_View()
{
    let window = UIApplication.shared.keyWindow!
    let v = UIView(frame: CGRect(x: window.frame.origin.x, y: window.frame.origin.y, width: window.frame.width, height: window.frame.height))
    window.addSubview(v);
    v.backgroundColor = UIColor.black.withAlphaComponent(0.7)

    let indicatorTemp = UIActivityIndicatorView (frame: CGRect(x: window.frame.origin.x, y: window.frame.origin.y, width: window.frame.width, height: window.frame.height))
    indicatorTemp.startAnimating()
    indicatorTemp.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.white
    window.addSubview(indicatorTemp)
}

如您所见，我通过调用pop_Up_A_View函数看到带有活动指示器的视图。如何使用活动指示器消除此视图？我试图将这段代码编写为close_Sub_View函数，但我不知道。

实际上，我应该再执行一个案例。如果已经有一个打开的子视图，则pop_Up_A_View函数不应再打开一个子视图。

Answer 1

您可以将您的视图标签识别出来并删除。您还必须将指标视图添加到视图v内，而不是直接添加窗口

使用以下内容

func pop_Up_A_View(){

    let window = UIApplication.shared.keyWindow!
    if let view = window.viewWithTag(1000) as? UIView {
        return
    }

    let v = UIView(frame: CGRect(x: window.frame.origin.x, y: window.frame.origin.y, width: window.frame.width, height: window.frame.height))
    v.tag = 1000
    v.backgroundColor = UIColor.black.withAlphaComponent(0.7)

    let indicatorTemp = UIActivityIndicatorView (frame: CGRect(x: window.frame.origin.x, y: window.frame.origin.y, width: window.frame.width, height: window.frame.height))
    indicatorTemp.startAnimating()
    indicatorTemp.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.white
    v.addSubview(indicatorTemp)
    window.addSubview(v);
}

func close()
{
    let window = UIApplication.shared.keyWindow!
    if let view = window.viewWithTag(1000) {
        (view as! UIView).removeFromSuperview()
    }

}

如何关闭打开的子视图？

1 个答案: