xcode 使用 Swift 根据搜索文本搜索数组
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Search an array based on search text using Swift
提问by Nassif
I am a newbie to swift and i have a new project. I am trying to do a search feature. I have a array of dictionaries, containing firstName and lastName as keys, i need to filter out people based on the firstName which contains the search string
我是 swift 的新手，我有一个新项目。我正在尝试做一个搜索功能。我有一个字典数组，包含 firstName 和 lastName 作为键，我需要根据包含搜索字符串的 firstName 过滤掉人
let nameList : [Dictionary<String,String>] =
[["firstName" : "John Sam","lastName" : "Smith"],
["firstName" : "Johnny","lastName" : "Smith"],
["firstName" : "Albert","lastName" : "Smith"],
["firstName" : "Alby","lastName" : "Wright"],
["firstName" : "Smith","lastName" : "Green"]]
As in objective C i could easily do with
就像在目标 C 中一样，我可以轻松地使用
[NSPredicate predicatewithformat:"firstName contains[c] %@",searchText]
I also understand that the same predicate can be done on Swift .but i am looking for an equivalent Swift, so that i can gain how to use map and filter. Any help appreciated
我也知道可以在 Swift 上完成相同的谓词。但我正在寻找等效的 Swift，以便我可以了解如何使用 map 和 filter。任何帮助表示赞赏
回答by Martin R
A search corresponding to the predicate operator "CONTAINS[c]"can be achieved with rangeOfString()with the .CaseInsensitiveSearchoption:
"CONTAINS[c]"可以rangeOfString()使用以下.CaseInsensitiveSearch选项实现与谓词运算符相对应的搜索：
let searchText = "MITH"
let filtered = nameList.filter {
return let filtered = nameList.filter {
return let nameList : [Dictionary<String,String>] =
[["firstName" : "John Sam","lastName" : "Smith"],
["firstName" : "Johnny","lastName" : "Smith"],
["firstName" : "Albert","lastName" : "Smith"],
["firstName" : "Alby","lastName" : "Wright"],
["firstName" : "Smith","lastName" : "Green"]]
func fn (x: Dictionary<String,String>) -> Bool {
return x["firstName"] == "Johnny"
}
nameList.filter(fn)
var r = nameList.filter({var result = (nameList.filter({let someString = "Alby"
var arr:NSArray =
[["firstName" : "John Sam","lastName" : "Smith"],
["firstName" : "Johnny","lastName" : "Smith"],
["firstName" : "Albert","lastName" : "Smith"],
["firstName" : "Alby","lastName" : "Wright"],
["firstName" : "Smith","lastName" : "Green"]]
var pre:NSPredicate = NSPredicate(format: "firstName CONTAINS[c] %@", someString)!
var result:NSArray = arr.filteredArrayUsingPredicate(pre)
print(result)
["lastName"] == "Smith"})).filter({let searchText = "John Sam"
func isMatch (nameDictionary: Dictionary<String, String>) -> Bool {
if(nameDictionary["firstName"] == searchText) {
return true
}
else {
return false
}
}
let results = nameList.filter(isMatch)
["firstName"] == "Johnny"})
["firstName"] == "Johnny"})
r
var s = nameList.filter({let searchText = "John Sam"
let results = nameList.filter {
nameDictionary in
nameDictionary["firstName"] == searchText
}
["lastName"] == "Smith"})
s
["firstName"]?.range(of: searchText, options: .caseInsensitive) != nil
}
["firstName"]?.rangeOfString(searchText, options: .CaseInsensitiveSearch) != nil
}
// Result: [[firstName: Smith, lastName: Green]]
Swift 3:
斯威夫特 3：
let searchText = "John Sam"
let results = nameList.filter {
##代码##["firstName"] == searchText
}
回答by Derick
You can filter by defining a function to filter by first, or just include the filter in a closure. Here's an excerpt that you can paste into a playground that demonstrates both options:
您可以通过定义一个函数来过滤，或者只在闭包中包含过滤器。这是您可以粘贴到演示这两个选项的操场上的摘录：
##代码##You can also filter the results of a filter to search for first and last name, e.g.
您还可以过滤过滤器的结果以搜索名字和姓氏，例如
##代码##See also: http://locomoviles.com/ios-tutorials/filtering-swift-array-dictionaries-object-property/
另见：http: //locomoviles.com/ios-tutorials/filtering-swift-array-dictionaries-object-property/
回答by Abhishek Sharma
Please try with following way.
请尝试以下方式。
I have passed constant valueyou need to pass your dynamic valueat place of someString variable.
我已经通过了constant value你需要通过你dynamic value的地方someString variable。
回答by bhavesh
Try,
尝试，
##代码##You are free to use closure.
您可以自由使用闭包。
##代码##or,
或者，
##代码##