Swift Sorting Array <Array <AnyObject>>

Question

我有以下回应。如何根据第一个元素进行排序。即[["Albania", "AE"], ["United States", "US"]]

[ 
    [ 
    "United States", 
    "US" 
    ], 
    [ 
    "Albania", 
    "AE" 
    ] 
] 

Answer 1

一个简单的方法来实现这一目标使用Closures。

这是一种快捷的排序方式。

let array = [["United States","US"],["Albania", "AE"],["India", "IN"],["United Kingdom", "UK"]] 
    print(array) 

    let arrAscending = array.sort({($0[0]) < ($1[0])}) 
    let arrDescending = array.sort({($0[0]) > ($1[0])}) 

    print(arrAscending) 
    print(arrDescending) 

Answer 2

尝试

var a = [ [ "United States", "US" ], [ "Albania", "AE" ] ] 

a.sort { (first, second) -> Bool in 
    return first.first < second.first 
} 

Answer 3

var array = [ [ "United States", "US" ], [ "Albania", "AE" ] ] 
array.sortInPlace({$0[0] < $1[0]})