CodeSchool's Try Objective C task to modify copyWithZone method to use id instead of Phone * on the definition of the variable named copy. This code runs ok but does not pass CodeSchool's verification. The error CodeSchool reports when this code is run is: Did not refactor the copyWithZone: method to use the generic id type instead of Phone *

App

#import "Phone.h"

Phone *talkingiPhone = [[Phone alloc] init];
talkingiPhone.phoneName = @"Mr. Higgie";
[talkingiPhone decreaseBatteryLife:@5];

Phone *copy = [talkingiPhone copy];
[copy reportBatteryLife];

output

Phone.m[19]: Mr. Higgie

Phone.m[33]: Copy of Mr. Higgie's battery life is 95

Phone.h

@interface Phone : NSObject <NSCopying> {
  NSNumber *_batteryLife;
}

@property NSString *phoneName;
@property NSString *modelNumber;

- (Phone *)initWithBatteryLife:(NSNumber *)batteryLife;
- (void) decreaseBatteryLife:(NSNumber *)arg;
- (NSString *) speak:(NSString *)greeting;
- (void) reportBatteryLife;
@end

Phone.m

#import "Phone.h"

@implementation Phone

- (Phone *)init;
{
  _batteryLife = @100;
  return [super init];
}

- (Phone *)initWithBatteryLife:(NSNumber *)batteryLife;
{
    _batteryLife = batteryLife;
    return [super init];
}

- (Phone *) copyWithZone:(NSZone *)zone;
{
   NSLog(@"%@", [self phoneName]);
   id copy = [[[self class] allocWithZone:zone] initWithBatteryLife:_batteryLife];
   [copy setPhoneName:[NSString stringWithFormat:@"Copy of %@", [self phoneName]]];
   return copy;
}

- (void) decreaseBatteryLife:(NSNumber *)arg;
{
  _batteryLife = @([_batteryLife intValue] - [arg intValue]);
}

- (void) reportBatteryLife;
{
  if(self.phoneName){
    NSLog(@"%@'s battery life is %@", self.phoneName, _batteryLife);  
  }else{
    NSLog(@"%@'s battery life is %@", self, _batteryLife);
  }
    
}

- (NSString *)speak:(NSString *)greeting;
{
    NSString *message = [NSString stringWithFormat:@"%@ says %@", self.phoneName, greeting];
    return message;
}
@end

resolution

- (id) copyWithZone:(NSZone *)zone;
{
   NSLog(@"%@", [self phoneName]);
   id copy = [[[self class] allocWithZone:zone] initWithBatteryLife:_batteryLife];
   [copy setPhoneName:[NSString stringWithFormat:@"Copy of %@", [self phoneName]]];
   return copy;
}