Swift 4中的UIButton数组 [英] Array of UIButtons in Swift 4

问题描述

我在UiKit中使用UIButtons制作了一系列复选框：

I've made a series of checkboxes in UiKit with UIButtons:

@IBOutlet weak var Box1: UIButton!
@IBOutlet weak var Box2: UIButton!
@IBOutlet weak var Box3: UIButton!
....
@IBOutlet weak var Box59: UIButton!




// Gives the button an action
@IBAction func Box1(_ sender: UIButton) {
    sender.isSelected = !sender.isSelected
}
@IBAction func Box2(_ sender: UIButton) {
    sender.isSelected = !sender.isSelected
}
@IBAction func Box3(_ sender: UIButton) {
    sender.isSelected = !sender.isSelected
}
    ....
@IBAction func Box59(_ sender: UIButton) {
    sender.isSelected = !sender.isSelected
}




// Creates button images of checkbox and unchecked box
var BoxON = UIImage(named: "CheckBox")
var BoxOFF = UIImage(named:"UnCheckBox")




// Allows the button to be set to the image, if selected or not 
override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    Box1.setImage(BoxOFF, for: .normal)
    Box1.setImage(BoxON, for: .selected)

    Box2.setImage(BoxOFF, for: .normal)
    Box2.setImage(BoxON, for: .selected)

    Box3.setImage(BoxOFF, for: .normal)
    Box3.setImage(BoxON, for: .selected)
    ....
    Box59.setImage(BoxOFF, for: .normal)
    Box59.setImage(BoxON, for: .selected)

    }

这是制作尽可能多的复选框所必需的全部代码。但是，每个复选框都需要在故事板上的正确位置创建/移动按钮，并将按钮从故事板上链接到刚刚编码的按钮变量。这可能会花费很多时间，因为每个视图控制器需要100多个按钮。

This is all the code necessary to make as many checkboxes as possible. However, each checkbox requires creating/moving a button to the right spot on the storyboard, linking the button from the storyboard to the button variable that was just coded. This can take a lot of time since I need over 100 buttons per view controller.

是否可以通过制作按钮数组来实现此目的？或类似的东西？

Is there a faster way to do this by making an array of buttons? or something similar?

推荐答案

可以将 IBOutlet 声明为数组

• 创建一个 IBOutlet 作为数组

@IBOutlet var boxes : [UIButton]!

将所有按钮连接到同一插座（按所需顺序）

Connect all buttons to the same outlet (in the desired order)

在 viewDidAppear 中使用循环或 forEach

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    boxes.forEach {
        $0.setImage(BoxOFF, for: .normal)
        $0.setImage(BoxON, for: .selected)
    }
}

为按钮添加唯一标签（可选）。

Add unique tags to the buttons (optional).

使用switch语句按数组中的索引区分按钮，或者通过标签

Use a switch statement to distinguish the buttons by index in the array or by tag

@IBAction func boxTouched(_ sender: UIButton) {
    sender.isSelected = !sender.isSelected
    let index = boxes.index(of: sender)!
    switch index {
       // handle the cases
    }
}

@IBAction func boxTouched(_ sender: UIButton) {
    sender.isSelected = !sender.isSelected
    switch sender.tag {
       // handle the cases
    }
}

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