Question

我在http://helpmecodeswift.com/advanced-functions/generating-uibuttons-loop

找到了UIButton的动态视图示例

我将此代码插入到我的应用中，但遗憾的是我无法找到为每个按钮设置标记的方法我的目标是知道点击了哪个按钮，计算每个按钮的点击次数并将此信息保存到我的数据库中。

override func viewDidLoad() {
    super.viewDidLoad()

    var arrayOfVillains = ["santa", "bugs", "superman", "batman"]

    var buttonY: CGFloat = 20
    for villain in arrayOfVillains {

        let villainButton = UIButton(frame: CGRect(x: 50, y: buttonY, width: 250, height: 30))
        buttonY = buttonY + 50  // we are going to space these UIButtons 50px apart

        villainButton.layer.cornerRadius = 10  // get some fancy pantsy rounding
        villainButton.backgroundColor = UIColor.darkGrayColor()
        villainButton.setTitle("Button for Villain: \(villain)", forState: UIControlState.Normal) // We are going to use the item name as the Button Title here.
        villainButton.titleLabel?.text = "\(villain)"
        villainButton.addTarget(self, action: "villainButtonPressed:", forControlEvents: UIControlEvents.TouchUpInside)

        self.view.addSubview(villainButton)  // myView in this case is the view you want these buttons added
    }
}

func villainButtonPressed(sender:UIButton!) {

    if sender.titleLabel?.text != nil {
        println("You have chosen Villain: \(sender.titleLabel?.text)")
    } else {

        println("Nowhere to go :/")

    }

}

}

那么如何设置和获取代码中每个按钮的标记（在本例中）？提前谢谢！

Answer 1

你应该为此使用基于整数的for循环。

for i in 0 ..< arrayOfVillains.count {
    let villain = arrayOfVillains[i]
    let villainButton = UIButton(frame: CGRect(x: 50, y: buttonY, width: 250, height: 30))
    villainButton.tag = i
}

Answer 2

您可以使用枚举数组来访问迭代中当前项的索引，并将其用作标记：

override func viewDidLoad() {
    super.viewDidLoad()

    var arrayOfVillains = ["santa", "bugs", "superman", "batman"]

    var buttonY: CGFloat = 20  
    for (index, villain) in arrayOfVillains.enumerated() {

        let villainButton = UIButton(frame: CGRect(x: 50, y: buttonY, width: 250, height: 30))
        buttonY = buttonY + 50  // we are going to space these UIButtons 50px apart

        // set the tag to current index
        villainButton.tag = index

        villainButton.layer.cornerRadius = 10  // get some fancy pantsy rounding
        villainButton.backgroundColor = UIColor.darkGrayColor()
        villainButton.setTitle("Button for Villain: \(villain)", forState: UIControlState.Normal) // We are going to use the item name as the Button Title here.
        villainButton.titleLabel?.text = "\(villain)"
        villainButton.addTarget(self, action: "villainButtonPressed:", forControlEvents: UIControlEvents.TouchUpInside)

        self.view.addSubview(villainButton)  // myView in this case is the view you want these buttons added
        }
    }       
}

@objc func villainButtonPressed(sender:UIButton!) {

    // tag of pressed button
    print(">>> you pressed button with tag: \(sender.tag)")

    if sender.titleLabel?.text != nil {
        println("You have chosen Villain: \(sender.titleLabel?.text)")
    } else {

        println("Nowhere to go :/")

    }        
}

为动态UIButton分配标签

2 个答案: