iOS Swift如何通过键订购Dictionnary

Question

我正在尝试按键(The Double)订购[Double:Article]字典.

我已经尝试了一切,现在我有以下代码:

    // getting an array of sorted keys
    let articlesKeys = articles.keys.sort{$0 > $1}

    var sortedArticles = [Double:Article]()

    // trying to fill the new dictionary in a descending keys order
    for key in articlesKeys
    {
        sortedArticles[key] = articles[key]
    }

    // replacing the old dictionary (articles)
    // with the new and ordered one (sortedArticles)
    articles.removeAll()
    articles = sortedArticles

问题是订购了"articleKeys"

print(articleKeys)===> [220,218,110]

但是当我打印出"sortedArticles"或新的"文章"时:

print(sortedArticles)===> [110:X],[220:Y],[218:Z]

字典尚未订购:(

Answer 1

字典是无序的 - 这是它们的本质.你无法对它们进行排序.但是你可以以某种方式使用数组来存储键和值作为其值.

点击此处了解更多相关信息,请访问http://rypress.com/tutorials/objective-c/data-types/nsdictionary

实际上有一些东西会帮助你.了解有关keysSortedByValueUsingComparator的更多信息: