iphone - 使用 NSPredicate 过滤带有字典的数组

Question

有一个数组，每个元素都是一个 NSDictionary。

NSMutableArray *mutArr = [NSMutableArray array];

for (Person *person in persons) {
    NSDictionary *dict = [[NSDictionary alloc] initWithObjectsAndKeys:person.name, @"name", person.email, @"email", nil];
    [mutArr addObject:dict];
}

self.arr = [[NSArray alloc] initWithArray:mutArr];

如何使用 filterArrayUsingPredicate: 方法过滤名称或电子邮件包含字符串 @"filter string" 的 arr。

提前致谢!

Answer 1

请看下面的例子:

 NSArray *array = [NSArray arrayWithObject:[NSMutableDictionary dictionaryWithObject:@"filter string" forKey:@"email"]];   // you can also do same for Name key... 
    NSArray *filteredarray = [array filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(email == %@)", @"filter string"]];