Ios 如何使arc4random在swift中选择4个不同的名称
当我在文本字段中写入5个名称时,如何使ARC4随机选择4个不同的名称而不进行回复Ios 如何使arc4random在swift中选择4个不同的名称,ios,swift,Ios,Swift,当我在文本字段中写入5个名称时,如何使ARC4随机选择4个不同的名称而不进行回复 import UIKit class ViewController: UIViewController, UIPickerViewDelegate { var array = [String]() @IBOutlet var textfi1: UITextField! @IBOutlet var textfi2: UITextField! @IBOutlet var text
import UIKit
class ViewController: UIViewController, UIPickerViewDelegate {
var array = [String]()
@IBOutlet var textfi1: UITextField!
@IBOutlet var textfi2: UITextField!
@IBOutlet var textfi3: UITextField!
@IBOutlet var textfi4: UITextField!
@IBOutlet var textfi5: UITextField!
@IBOutlet weak var lbl: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
@IBAction func button(sender: AnyObject) {
numberFive()
}
func numberFive() {
array = [ textfi1.text! , textfi2.text! , textfi3.text! , textfi4.text! , textfi5.text! ]
let randomIndex = Int(arc4random_uniform(UInt32(5)))
lbl.text! = "\(array[randomIndex]) with \(array[randomIndex]) \n \(array[randomIndex]) with \(array[randomIndex])"
lbl.numberOfLines = 0
}
}
据我所知,你想从5个名字的列表中随机选择4个,然后(随机)将它们配对成两对
/* say these are the names from the .text property
of your UITextField instances */
var names = ["David", "Lisa", "Greg", "Hannah", "Richard"]
/* create an array of tuples to hold the pairs */
var pairs : [(String, String)] = []
/* randomly assign 4 out of 5 names into two pair containers */
let numPairs = names.count/2 // Int division => rounds down by simply dropping decimal value
for _ in 0..<numPairs {
var newPair : (String, String)
newPair.0 = names.removeAtIndex(Int(arc4random_uniform(UInt32(names.count))))
newPair.1 = names.removeAtIndex(Int(arc4random_uniform(UInt32(names.count))))
pairs.append(newPair)
}
/* random result */
pairs.forEach { print("\($0.0) with \($0.1)") }
/* Hannah with Lisa
Greg with Richard */
/*说这些是.text属性中的名称
您的UITextField实例的*/
变量名称=[“大卫”、“丽莎”、“格雷格”、“汉娜”、“理查德”]
/*创建一个元组数组来保存这些对*/
变量对:[(字符串,字符串)]=[]
/*将5个名称中的4个随机分配到两对容器中*/
让numPairs=names.count/2//Int division=>通过简单地删除十进制值进行舍入
对于0中的uu..在拾取该项后将其从数组中移除,然后更改随机项的“最大”值。为什么标签出口较弱?请重新表述您的问题,因为它是incomprehensible@Larme我该怎么做呢?哦,老兄,你真好,非常感谢,终于有工作了@X.BOZO很乐意帮忙。只需确保您的UILabel
“lbl”设置为显示多行,否则第二对将被截断。(例如,lbl.numberOfLines=2
)。
// ... in your ViewController class
func divideIntoPairs() {
if let name1 = textfi1.text, name2 = textfi2.text,
name3 = textfi3.text, name4 = textfi4.text,
name5 = textfi5.text {
var names = [name1, name2, name3, name4, name5]
var pairs : [(String, String)] = []
let numPairs = names.count/2
for _ in 0..<numPairs {
var newPair : (String, String)
newPair.0 = names.removeAtIndex(Int(arc4random_uniform(UInt32(names.count))))
newPair.1 = names.removeAtIndex(Int(arc4random_uniform(UInt32(names.count))))
pairs.append(newPair)
}
pairs.forEach { print("\($0.0) with \($0.1)") }
/* 'SomeName' with 'AnotherName'
'EvenAnotherName' with 'AFinalOtherName' */
// or, to set this as a single String to UILabel: text property
lbl.text = pairs.map { "\($0.0) with \($0.1)" }.joinWithSeparator("\n")
}
}