我需要在同一个完全字典中转换带有混合大小写字典的字典,但只使用小写字母.
这是我的尝试(它有效,但我发现这个实现非常粗糙)
extension Dictionary {
func lowercaseKeys()->Dictionary<String,AnyObject>{
var newDictionary = Dictionary<String,AnyObject>()
for k in keys{
if let k_string = k as? String{
newDictionary[k_string.lowercaseString] = self[k] as? AnyObject
}
}
return newDictionary
}
}
无需临时字典即可更改自己的密钥;)
var dict = ["HEJ":"DÅ","NeJ":"tack"]
for key in dict.keys {
dict[key.lowercaseString] = dict.removeValueForKey(key)
}
print(dict)
[hej: DÅ,nej: tack]
编辑
我做了这个扩展,现在它有点脏,但我会再次更新它.
extension Dictionary {
mutating func lowercaseKeys() {
for key in self.keys {
let str = (key as! String).lowercaseString
self[str as! Key] = self.removeValueForKey(key)
}
}
}
var dict = ["HeJ":"Då","nEJ":"taCK!"]
dict.lowercaseKeys()
print(dict)
[“hej”: “Då”,“nej”: “taCK!”]
编辑2
extension Dictionary where Key: StringLiteralConvertible {
mutating func lowercaseKeys() {
for key in self.keys {
self[String(key).lowercaseString as! Key] = self.removeValueForKey(key)
}
}
}
var dict = ["NamE":"David","LAST_NAME":"Göransson"]
dict.lowercaseKeys() // Will compile
var dict2 = [0:"David",0:"Göransson"]
dict2.lowercaseKeys() // Won't compile because Key isn't StringLiteralConvertible
