每次显示视图控制器时如何随机化 UILabel 文本 [英] How to randomize UILabel text each time the view controller is showed

问题描述

每次显示视图控制器时，如何使我的 ViewController 中的标签具有不同的文本字符串?谢谢！我正在使用 Swift 3

How do I make a label in my ViewController have a diffrent string of text each time the view crontroller is shown? Thanks! I'm using Swift 3

推荐答案

假设您知道如何将 UILabel 添加到您的 ViewController，这里是如何选择随机的快速示例开始时的文字:

Assuming you know how to add UILabel to your ViewController, here is quick sample how to pick random text on start:

class ViewController: UIViewController {
    let allTexts = ["Hey", "Hi", "Hello"]
    @IBOutlet weak var label: UILabel! //get UILabel from storyboard

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.label.text = self.allTexts[Int(arc4random_uniform(UInt32(self.allTexts.count)))]
    }
}

将此代码添加到 viewWillAppear 将在 ViewController 即将出现时更改您的文本 - 这意味着如果您用另一个 ViewController 覆盖它(假设弹出窗口)然后隐藏弹出窗口 - 它会更改文本.

Adding this code to viewWillAppear will change your text anytime ViewController is about to appear - which means if you cover it with another ViewController (let's say popup) and then hide popup - it will change text.

如果您更喜欢只做一次 - 在创建 UIViewController 时将相同的代码放入 viewDidLoad 方法中.

If your prefer to just do it one time - when UIViewController is created put the same code inside viewDidLoad method.

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