Use NSPredicate to filter by object attribute

问题

I have a mutable array of custom objects. I want to filter that array by attribute of the object, for example myObject.attributeOne.

How can I create the NSPredicate to use with

[myArrayOfObjects filterUsingPredicate:<the_predicate>]

回答1:

Use it in this way:

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"FriendStatus == 1"];

NSMutableArray *filtered = [MessageArray filteredArrayUsingPredicate:predicate];

来源：https://stackoverflow.com/questions/3386079/use-nspredicate-to-filter-by-object-attribute