Question

For some reason I can’t use arc, so in my code below..

Foo.h

@interface Foo : NSObject

@property (nonatomic, copy) NSString * string;

@end

Foo.m

@implementation Foo

@synthesize string=_string;

- (void) bar {
    self.string = [NSString stringWithFormat:@"test1"];
    self.string = [NSString stringWithFormat:@"test2"];
}

-(void) dealloc
{
    [_string release];

    [super dealloc];
}
@end

The bar method might not always be called, or they can be called multitime.

Is only one release in the dealloc is all needed?

Answer 1

Yes, since you are using properties so setter method will take care of releasing memory allocation.It will allocate memory as follows:

-(void)setValue:(NSString *)strValue
{
   if(string)
   {
     [string release];
     string = nil;
   }
   string = [strValue copy];
}