小编Aka*_*ash的帖子

当我尝试在我的应用中实现广告连播图表时。它显示了以下错误。

import UIKit

import Charts

class chartViewController: UIViewController {

@IBOutlet weak var barChartView:BarChartView!
let months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
let unitsSold = [20.0, 4.0, 6.0, 3.0, 12.0, 16.0, 4.0, 18.0, 2.0, 4.0, 5.0, 4.0]

override func viewDidLoad() {
    super.viewDidLoad()
   setupChart(x: months, y: unitsSold)
}

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

func setupChart(x:[String],y:[Double]){
   var dataEntries: [BarChartDataEntry] = []

    for i in …

如何integer array快速逆转

例如: var ab = [1,2,3,4]

我想以反向格式存储数组.

结果应该是

ab = [4,3,2,1]