Question

I can’t figure out why my getter and setter code is not working. In some example code I was going over:

- (NSArray *)sushiTypes {
  return _sushiRolls;
}

- (void)setSushiTypes:(NSArray *)sushiRolls {
  [sushiRolls retain];
  [_sushiRolls release];
  _sushiRolls = sushiRolls;
}

Then in:

- (void)viewDidLoad {
  [super viewDidLoad];
  self.sushiTypes = [[NSArray alloc]initWithObjects:@"...]autorelease];
}

The whole time, this worked, but a property for sushiTypes was never declared. I (sort of) get how this works, since it works the same as a setter/getter regardless of whether it was synthesized or not.

But here’s my code, and I get a compiler error asking for a property. Did I miss something?

#import <Foundation/Foundation.h>

@interface Temp0 : NSObject {
    NSNumber *x1;
}

-(NSNumber *)x1;
-(void)setx1:(NSNumber *)x;

@end

---

//
#import "Temp0.h"

@implementation Temp0

-(NSNumber *)x1 {
    return x1;
}

-(void)setx1:(NSNumber *)x {
    [x retain];
    [x1 release];
    x1 = x;
}

-(id)init 
{
    self.x1 = [[NSNumber alloc]initWithInt:1];    // Error on this line:
    // Setter method is needed to assign to object using property assignment syntax
    [super init];
}

@end

Screenshot of this code and the error in Xcode

Answer 1

It’s standard to capitalize the first letter of the property in the setter method name. As you correctly have in:

-(void)setSushiTypes:(NSArray *)sushiRolls

So setX1: is the expected method signature.

-(void)setX1:(NSNumber *)x1;