IOS谓词--NSPredicate 和array

        NSArray *array = [NSArray array];

       NSPredicate *predicate = [NSPredicate predicateWithFormat:@"self.msgid == %@",feed.msgid];

        NSArray *filterArr = [array filteredArrayUsingPredicate:predicate];

1.         NSPredicate *predicate1=[NSPredicate predicateWithFormat:@"name=='holydancer'"];//创建谓词判断属性  
2.         NSPredicate *predicate2=[NSPredicate predicateWithFormat:@"child.age==5"];//创建谓词判断属性的属性