在 Swift 中的数组对象内搜索

Question

我有一个餐馆数组，它们是具有名称、类型、位置等的对象。如何只搜索一个餐馆名称，或者只搜索一个位置而不搜索整个数组对象？

例如我的数组有 2 个 Restaurant 对象。我只想搜索名称是否包含“United”。如果我搜索整个对象，由于国家/地区，两者都会出现。

[<Restaurant: 0x7fcb0ad80950, objectId: LA74J92QDA, localId: (null)> {
    City = "New York";
    Country = "United States";
    Name = United Bakery;
    RestaurantLoc = "<PFGeoPoint: 0x7fcb0af6cbc0, latitude: 40.759212, longitude: -73.984632>";
    State = NY;
    Street = "1 main st.";
    Zipcode = 10055;
}, <Restaurant: 0x7fcb0af6cfc0, objectId: 0aKFrpKN46, localId: (null)> {
    City = "New York";
    Country = "United States";
    Name = Wendys Bakery;
    RestaurantLoc = "<PFGeoPoint: 0x7fcb0af6cd60, latitude: 40.759210, longitude: -73.984631>";
    State = NY;
    Street = "1 main st.";
    Zipcode = 10055;
}]

这是创建对象数组的块：

            let userGeoPoint = currentLocGeoPoint
            var query = PFQuery(className:"Restaurant")
            query.whereKey("RestaurantLoc", nearGeoPoint:userGeoPoint, withinMiles:50)
            query.limit = 2

            query.findObjectsInBackgroundWithBlock {
                (object: [AnyObject]!, error: NSError!) -> Void in
                if object != nil {
                    println(object)
                } else {
                    println("The getObject request failed with error: \(error)")
                }
            }

Answer 1

您可以使用filteredArrayUsingPredicate。这是一个小例子：

NSString *searchString = @"a";
NSArray *filteredProducts = [products filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"title CONTAINS[cd] %@", searchString]];

斯威夫特：

let searchString = "text_to_search"
let predicate = NSPredicate(format: "title CONTAINS[cd] %@", searchString);
let filteredArray = array.filteredArrayUsingPredicate(predicate!);

Answer 2

尝试使用 filter(_:) 函数。来自 Apple 开发者：

Returns an array containing the elements of the array for which a provided closure indicates a match.

Use this method to return a new array by filtering an existing array. The closure that you supply for includeElement: should return a Boolean value to indicate whether an element should be included (true) or excluded (false) from the final collection

来源：https://developer.apple.com/library/ios/documentation/General/Reference/SwiftStandardLibraryReference/Array.html