Question

我有一个数组中的项目，我希望Xcode随机选择其中一个来显示，我对编码很新，所以如果你能详细解释它会很棒。我希望它从数组中选择一个，然后选择PrintLn。这是我目前的代码。

   import UIKit

class Player1: UIViewController {

var stringArray = ["string1", "string2", "string3"]



override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func truth() {
     print(stringArray.random())
}




/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    // Get the new view controller using segue.destinationViewController.
    // Pass the selected object to the new view controller.
}
*/

}

Answer 1

您可以将此小扩展添加到Array类：

extension Array {
    public func random() -> Element {
        let index = Int(arc4random_uniform(UInt32(self.count)))
        return self[index]
    }
}

然后您可以像这样使用数组的random()函数：

var stringArray = ["string1", "string2", "string3"]
print(stringArray.random())

获取Swift 2随机选择一个数组

1 个答案: