Question

use of string crashing application.
temp is Normal string and strStartDate is also string from Date.
.h file

NSString *temp;
NSString *strStartDate
int status;

.m file

-(void)viewDidLoad
{
    [super viewDidLoad];
    status = 1;
     strStartDate=[[NSString alloc]init];
    [self stateChanged];
}
-(void)stateChanged
{
    switch(status)
    {
    case 0:
        NSLog(@"%@",temp);
        NSLog(@"Start Date : %@",strStartDate);
        break;

    case 1:
        temp=[[NSString alloc]initWithString:@"Temp is here"];
        chargeStartDate=[[NSDate date] retain];
        NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
        [dateFormat setDateFormat:@"dd/MM/YYYY"];
        strStartDate =  [dateFormat stringFromDate:chargeStartDate];
        NSLog(@"string of start date : %@",strStartDate);
        [timeFormat release];
        [dateFormat release];
        break;
    }
}

temp is Normal string and strStartDate is also string from Date.
strings temp and strStartDate both allocating same place, both are class variable, and print same place but in case 0 temp is print while strStarDate crashing. Why?

I know this is simple but, i can’t understand. Please help me.

Answer 1

You need to do a retain on strStartDate after initializing it with stringFromDate. The result of that call will be auto released so you need a retain to stop the object being freed.