I have several objects
Struct object {
var title:String?
}
var one = object("green")
var two = object("black")
var three = object("blue")
Also I have a dictionary
var dict = ["a":[one, two], "b":[three]]
What I want is to iterate over dictionary values and find all objects that starts from "b".
I though about something like
for (key, value) in dict {
if value.lowercaseString.containsString(searchText.lowercaseString)
}
but I get an error of
value of type [object] has no member 'lowercaseString'
how can I deal with this ?
you are iterating over a dictionary by looking at it keys and values.
But the values aren't strings but arrays of strings.
do
import Foundation
struct object {
var title:String?
}
var one = object(title:"green")
var two = object(title:"black")
var three = object(title:"blue")
var dict = ["a":[one, two], "b":[three]]
for (key, value) in dict {
for obj in value {
if let title = obj.title {
if title.lowercaseString.containsString(searchText.lowercaseString) {
// ...
}
}
}
}
Your value is an array of object "[object]" but not a string, as defined by your code above:
var dict = ["a":[one, two], "b":[three]]
So you have to process the value as an array of objectto find out what you want.
for (key, value) in dict {
let found = value.filter({ (anObject: object) -> Bool in
return anObject.title!.lowercaseString.containsString("b")
})
if (found.count > 0) {
//you find what you want.
}
}
来源：https://stackoverflow.com/questions/38439984/access-custom-object-property-while-iterating-over-dictionary