iOS 8 Swift:点击按钮时无法取消隐藏UIView

Question

这让我抓狂。我正试图在单击按钮时取消隐藏隐藏的UIView，但它不起作用。这是代码

import UIKit
class DownloadViewController: UIViewController {
    @IBOutlet var activityView: UIView!
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        self.activityView.hidden = true
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    @IBAction func downloadAction(sender: AnyObject) {
        self.activityView.hidden = false
    }    
}

请帮帮我。这不是一件简单的事，真让我发疯。

Answer 1

确保您的插座连接到Interface Builder中的正确按钮，然后通过ctrl从IB中的按钮拖动到@IBOutlet代码来尝试再次连接。

Answer 2

这段代码有效，是出现错误还是按钮什么都没做？

Answer 3

Swift 3

导入UIKit类DownloadViewController:UIViewController｛

@IBOutlet var activityView: UIView!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    self.activityView.isHidden = true
}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
@IBAction func downloadAction(sender: AnyObject) {
    self.activityView.isHidden = false
}    

}