使用谓词在数组中搜索字典

Question

I have an array of dictionaries and I want to find the dictionary with desired value for key "guid". Can not get it with this code:

NSPredicate *filter = [NSPredicate predicateWithFormat:@"guid = %@", key];
NSArray *filteredContacts = [selectedValue filteredArrayUsingPredicate:filter];

Answer 1

Try this.

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"Name CONTAINS[cd] %@",searchBar.text];

filterdArray = [[hospitalArray filteredArrayUsingPredicate:predicate] mutableCopy];

Where Name is the key contained in the dictionary under the array.

Answer 2

I think you forgot "=" sign.

 NSPredicate *filter = [NSPredicate predicateWithFormat:@"guid == %@", key];
 NSArray *filteredContacts = [selectedValue filteredArrayUsingPredicate:filter];

Answer 3

The operator condition has been forgotten ;)

You need to add a double "=" like this :

NSPredicate *filter = [NSPredicate predicateWithFormat:@"guid == %@", key];
NSArray *filteredContacts = [selectedValue filteredArrayUsingPredicate:filter];

I hope this can help you !

Answer 4

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(guid CONTAINS[c] %@)",key];
NSArray *array = [[NSArray arrayWithArray:sampleArray] filteredArrayUsingPredicate: predicate];

in above code "fromDate" is key of dictionary.

i hope this works for you.

Answer 5

You could try to initiate the NSPredicate as:

NSPredicate *filter = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"guid = '%@'", key]];

Hope it helps.

Answer 6

试试这个，

NSArray *filtered = [array_with_dict filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(guid == %@)", @"desired value"]];