■BOOL -> NSNumber NSNumber *number = [[NSNumber alloc] initWithBool:YES]; ■int -> NSNumber NSNumber *number = [[NSNumber alloc] initWithInt:1]; ■float -> NSNumber NSNumber *number = [[NSNumber alloc] initWithfloat:1.1]; ■double ->NSNumber NSNumber *number = [[NSNumber alloc] initWithDouble:1.23456789]; ■NSNumber -> BOOL BOOL aBool = [number boolValue]; ■NSNumber -> int int i = [number intValue]; ■