searching keys in dictionary swift - ios

Question

I want to search for the key id in the dictionary. I have a dictionary like this:
var tableData:[String:Any] = ["id":["path":"","type":"","parameters":[]]]
Table data has 307 items, and all id's unique. I want to search in dictionary key id, like when I write "get" , it need the show all the search results with "get" in table view.
func updateSearchResults(for searchController: UISearchController) {
let searchString = searchController.searchBar.text
if let entry = tableData.keys.first(where: { $0.lowercased().contains(searchString) }) {
print(entry)
} else {
print("no match")
}
tableView.reloadData()
}
func didChangeSearchText(searchText: String) {
if let entry = tableData.keys.first(where: { $0.lowercased().contains(searchText) }) {
print(entry)
} else {
print("no match")
}
// Reload the tableview.
tableView.reloadData()
}
When I try to search a word it prints "no match", in the debug, unable to read data writes for the value of the entry. Thank you in advance!

Answer 1

In fact your keys have to be unique and as in your case id is a top level key you don't have to perform filtering in order to access its value. Simply use tableData[searchText] to grab its value.
If you don't know the id value and you want to loop through all the keys you can do so like
for key in tableData.keys {
print(key)
let value = tableData[key]
// or do whatever else you want with your key value
}
As per what you already have in place you need to do the following
var tableData:[String:Any] = ["hello world":["path":"fgh","type":"dfghgfh","parameters":[]], "something else":["path":"sdfsdfsdf","type":"dfghfghfg","parameters":[]]]
if let entry = tableData.keys.first(where: { $0.lowercased().contains("hello") }) {
print(entry)
// prints 'hello world'
} else {
print("no match")
}
Or you can simply get a new filtered array from your data source like
let result = tableData.filter { (key, value) in
key.lowercased().contains("else") // your search text replaces 'else'
}
/*
* result would be an array with the objects based on your id search
* so you'll not only have the keys but the entire object as well
*/
print("Found \(result.count) matches")

Answer 2

To access an element in a Dictionary with a key, use the following code.
if let entry = tableData[searchText] {
print(entry)
}
For further information, have a look at:
how can i get key's value from dictionary in Swift?

Answer 3

Try using first(where:) directly on tableData, like this:
func updateSearchResults(for searchController: UISearchController) {
guard let searchString = searchController.searchBar.text else { return }
if let (id, entry) = tableData.first(where: { (key, value) -> Bool in key.lowercased().contains(searchString) }) {
print(entry)
} else {
print("no match")
}
tableView.reloadData()
}
func didChangeSearchText(searchText: String) {
if let (id, entry) = tableData.first(where: { (key, value) -> Bool in key.lowercased().contains(searchText) }) {
print(entry)
} else {
print("no match")
}
// Reload the tableview.
tableView.reloadData()
}