- (void)applicationWillResignActive and save string -->ERROR

I want to compare two strings after reloading my App. (strold and strnew are declared global)

But if i call the string 'strold' in -applicationWillEnterForeground: i get the following error message:

0x011eca62 <+0022> push %edi

0x011eca63 <+0023> mov 0x8(%edx),%edi (BAD EXIT FOR THIS LINE)

- (void)applicationWillEnterForeground:(UIApplication *)application{

    opendate = [NSDate date];
    NSDateFormatter* formatter = [[[NSDateFormatter 开发者_运维问答alloc] init] autorelease];
    [formatter setDateFormat:@"yyyy-MM-dd"];
    strnew = [formatter stringFromDate:opendate];
    NSLog(@"Active %@",strnew);
    NSLog(@"Inctive %@",strold);


}


- (void)applicationWillResignActive:(UIApplication *)application{

    closedate = [NSDate date];
    NSDateFormatter* formatter = [[[NSDateFormatter alloc] init] autorelease];
    [formatter setDateFormat:@"yyyy-MM-dd"];
    strold = [formatter stringFromDate:closedate];

}

I just want to check if a day changed actually. significanttime Method did not worked for me.

You will have to retain strold as it is autoreleased.

strold = [[formatter stringFromDate:closedate] retain];

or

self.strold = [formatter stringFromDate:closedate];

if strold is defined as a retained property.