iOS Swift 4通過特定值對字典進行排序

Question

您能幫我對下面的字典中的值“ Val1”進行排序嗎？

var data = ["key1" : ["val1": 1,"val2": 1],
            "key2" : ["val1": 5,"val2": 2],
            "key3" : ["val1": 0,"val2": 9]]

我希望這本字典能像這樣排序。 “ Val1”的最高值排在最前面（降序）。

var data = [ "key2" : ["val1": 5,"val2": 2],
             "key1" : ["val1": 1,"val2": 1],
             "key3" : ["val1": 0,"val2": 9]]

Answer 1

正如@Sulthan正確指出的那樣， Dictionary無法排序。 如果仍然願意，您將得到一個Array作為結果。

let data = [
    "key1": ["val1": 1,"val2": 1],
    "key2": ["val1": 5,"val2": 2],
    "key3": ["val1": 0,"val2": 9]
]

let result = data.sorted { $0.1["val1"]! > $1.1["val1"]! }
print(result)

[（key：“ key2”，value：[“ val1”：5，“ val2”：2]），（key：“ key1”，value：[“ val1”：1，“ val2”：1]），（鍵：“ key3”，值：[“ val1”：0，“ val2”：9]）]