过滤包含自定义对象的NSArray [英] Filter an NSArray which contains custom objects

问题描述

我有 UISearchBar ， UITableView ，一个返回 NSMutableArray的网络服务包含如下对象：

I have UISearchBar, UITableView, a web service which returns a NSMutableArray that contain objects like this:

//Food.h
Food : NSObject { 
    NSString *foodName;
    int idFood;
}

@property (nonatomic, strong) NSString *foodName;

数组：

Food *food1 = [Food alloc]initWithName:@"samsar" andId:@"1"];
Food *food2 = [Food alloc] initWithName:@"rusaramar" andId:@"2"];

NSSarray *array = [NSArray arrayWithObjects:food1, food2, nil];

如何使用名称以sa开头的对象过滤我的数组？

How do I filter my array with objects with name beginning with "sa"?

推荐答案

您可以使用以下代码过滤任何您想要的数组：

You can filter any array like you'd like to with the following code:

NSMutableArray *array = ...;

[array filterUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(id evaluatedObject, NSDictionary *bindings) {
    return [evaluatedObject.foodName hasPrefix:searchBar.text];
}];

这将就地过滤数组，只能在的NSMutableArray 。如果您想获得一个已经过滤的新数组，请使用 filteredArrayUsingPredicate： NSArray 方法。

This will filter the array "in-place" and is only accessible on an NSMutableArray. If you'd like to get a new array that's been filtered for you, use the filteredArrayUsingPredicate: NSArray method.

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