Question

ios coredata有没有count总数

Answer 1

我刚开始跟着老头学iOS开发，他的做法似乎是这样的：NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName: @"XXX"]; request.predicate = [NSPredicate predicateWithFormat:@"type= %@"，@“2”]; NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey: @"XXXX" ascending:YES]; request.sortDescriptors = [NSArray arrayWithObject:sortDescriptor]; NSError *error = nil; NSArray *match = [context executeFetchRequest:request error:&error];这样得