Question

如何在Swift中迭代对象/变量。我有附加对象时可以创建数组或字典，这样我就不必为每个按钮编写代码。我是个nubie所以请跟我说话，就像我四岁。感谢您的帮助。

import UIKit
class ViewController: UIViewController {

@IBOutlet weak var button1: UIButton!
@IBOutlet weak var button2: UIButton!
@IBOutlet weak var button3: UIButton!
...


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    self.button1.alpha = 0.0
    self.button2.alpha = 0.0
    self.button3.alpha = 0.0
    ...
}

Answer 1

import UIKit
class ViewController: UIViewController {

    @IBOutlet weak var button1: UIButton!
    @IBOutlet weak var button2: UIButton!
    @IBOutlet weak var button3: UIButton!
    var arrayOfButtons = [UIButton]()


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    arrayOfButtons = [button1, button2, button3]
    for button in arrayOfButtons {
        button.alpha = 0.0
    }
}

Answer 2

除了Tim的回答，您还可以通过编程方式创建按钮，并在代码中处理它们！

override func viewDidLoad() {
for i in 1...10 {
    let button = UIButton()
    button.frame = CGRectMake((CGFloat(i-1)*50), 0, 50, 50)
    button.targetForAction("buttonClick:", withSender: self)
    button.tag = i
    self.view.addSubview(button)
}
}


func buttonClick(sender:AnyObject) {
    let tag = sender.tag!
    //click logic here
}

迭代对象/变量Swift

2 个答案: