按下它们随机显示按钮

Question

我想在我的项目中有六个按钮，并希望它们始终隐藏，除了一个。当我按下未隐藏的按钮时，它应该被隐藏，另一个按钮应该随机出现并执行相同的操作。 如果有人可以帮助我，我将不胜感激！

Answer 1

在故事板中创建六个buttons，为其添加标签，然后创建一个Action outlet，将所有按钮连接到，然后执行以下操作：

@IBAction func button_clicked(_ sender: AnyObject) {
    // generate a random number which is not the same as the tag that you 
    repeat{
        random = Int(arc4random_uniform(6) + 1)
    }
    while random == sender.tag

    // iterate through all subviews in your view to find all buttons
    for view in self.view.subviews{
        // make sure it´s a button
        if view.isKind(of: UIButton.self){
            // create a button from the view you're iterating to
            let button = view as! UIButton
            // if the button tag is equal to the random number you just created we want to show that button 
            if button.tag == random{
                button.isHidden = false
            }
            // else hide it
            else{
                button.isHidden = true
            }
        }
    }
}

Here是我创建的示例项目，您可以尝试这样做。确保阅读上面代码中的注释并了解发生的情况。

Answer 2

<强> UI（故事板）

在我的情况下，六个按钮的按钮标签编号分别从0到5分配。

<强>

Row

Answer 3

我假设您已将六个按钮放在故事板上并将它们链接到您的课程中。 我很快就这样做了，所以它可能不是最有效的方法。

您希望您的班级代码看起来像这样：

override func viewDidAppear(_ animated: Bool) {
    BT6.isHidden = true
    BT5.isHidden = true
    BT4.isHidden = true
    BT3.isHidden = true
    BT2.isHidden = true
    //Hiding all but one button when the view controller loads
}

@IBOutlet weak var BT6: UIButton!
@IBOutlet weak var BT5: UIButton!
@IBOutlet weak var BT4: UIButton!
@IBOutlet weak var BT3: UIButton!
@IBOutlet weak var BT2: UIButton!
@IBOutlet weak var BT1: UIButton!

@IBAction func BT6(_ sender: AnyObject) {
    //this checks when BT6 is pressed and then hides it
    BT6.isHidden = true
    let random = Int(arc4random_uniform(UInt32(4)))
    if random == 0 {
        BT5.isHidden = false
    } else if random == 1 {
        BT4.isHidden = false
    } else if random == 2 {
        BT3.isHidden = false
    } else if random == 3 {
        BT2.isHidden = false
    } else if random == 4 {
        BT1.isHidden = false
    }
    //this part creates a randomiser between 0-4 and depending on which number turns out, it will hide a certain button
}
@IBAction func BT5(_ sender: AnyObject) {
    BT5.isHidden = true
    let random = Int(arc4random_uniform(UInt32(4)))
    if random == 0 {
        BT6.isHidden = false
    } else if random == 1 {
        BT4.isHidden = false
    } else if random == 2 {
        BT3.isHidden = false
    } else if random == 3 {
        BT2.isHidden = false
    } else if random == 4 {
        BT1.isHidden = false
    }
}
@IBAction func BT4(_ sender: AnyObject) {
    BT4.isHidden = true
    let random = Int(arc4random_uniform(UInt32(4)))
    if random == 0 {
        BT5.isHidden = false
    } else if random == 1 {
        BT6.isHidden = false
    } else if random == 2 {
        BT3.isHidden = false
    } else if random == 3 {
        BT2.isHidden = false
    } else if random == 4 {
        BT1.isHidden = false
    }
}
@IBAction func BT3(_ sender: AnyObject) {
    BT3.isHidden = true
    let random = Int(arc4random_uniform(UInt32(4)))
    if random == 0 {
        BT5.isHidden = false
    } else if random == 1 {
        BT4.isHidden = false
    } else if random == 2 {
        BT6.isHidden = false
    } else if random == 3 {
        BT2.isHidden = false
    } else if random == 4 {
        BT1.isHidden = false
    }
}
@IBAction func BT2(_ sender: AnyObject) {
    BT2.isHidden = true
    let random = Int(arc4random_uniform(UInt32(4)))
    if random == 0 {
        BT5.isHidden = false
    } else if random == 1 {
        BT4.isHidden = false
    } else if random == 2 {
        BT3.isHidden = false
    } else if random == 3 {
        BT6.isHidden = false
    } else if random == 4 {
        BT1.isHidden = false
    }
}
@IBAction func BT1(_ sender: AnyObject) {
    BT1.isHidden = true
    let random = Int(arc4random_uniform(UInt32(4)))
    if random == 0 {
        BT5.isHidden = false
    } else if random == 1 {
        BT4.isHidden = false
    } else if random == 2 {
        BT3.isHidden = false
    } else if random == 3 {
        BT2.isHidden = false
    } else if random == 4 {
        BT6.isHidden = false
    }
}