NSPredicate滤波

Question

下面的json对象存储为self.pElements。我有一个search bar，用于根据name过滤项目。

[
 {"id":"1","name":"Baked Chicken","category":"1","price":"5.49"},
 {"id":"2","name":"Beef Kabob","category":"2","price":"5.49"},
 {"id":"3","name":"Beef Gyro","category":"1","price":"5.49"},
 {"id":"4","name":"Lamb Gyro","category":"4","price":"5.49"} 
] 

我尝试按如下方式通过name进行筛选，但它总是返回null。即使我只输入Beef，也没有返回任何内容

pTempElements =[[NSMutableArray alloc] initWithArray:[self.pElements filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"name = %@", self.searchBar.text]]];

Answer 1

如果要筛选包含搜索字符串的字符串，请使用contains[cd]

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name contains[cd] %@", searchText];

有关可以进行的字符串比较类型的列表，请参阅谓词编程指南中的谓词格式字符串语法:字符串比较。