how to stop the result on the current date? - iphone

Question

I'm having prob,when i open the app i can see the latest result,when i swipe left of the uiview i can see the previous result,the problem that i face i wanted to swipe right to come for the latest result again.
the is the code for swipe left
-(void)swipeLeft
{
NSLog(#"Mag Date:%#",magCurDate);
NSDate *tempDate;
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"dd/MM/yyyy"];
tempDate = [formatter dateFromString:magCurDate];
NSLog(#"temp Date:%#",tempDate);
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
[dateComponents setDay:-1];
[dateComponents setHour:8];
NSDate *targetDate = [gregorian dateByAddingComponents:dateComponents toDate:tempDate options:0];
NSLog(#"target Date:%#",targetDate);
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"ddMMYYYY"];
NSString *sDate = [df stringFromDate:targetDate];
NSLog(#"sDate Date:%#",sDate);
[self LoadMagnumResult:sDate];
}
this is my swipe right code,but i couldn't stop on the latest result,i want the last swipe to be the latest result.
-(void)swipeRight
{
NSLog(#"Mag Date:%#",magCurDate);
NSDate *tempDate;
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"dd/MM/yyyy"];
tempDate = [formatter dateFromString:magCurDate];
NSLog(#"temp Date:%#",tempDate);
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
[dateComponents setDay:+1];
[dateComponents setHour:8];
NSDate *targetDate = [gregorian dateByAddingComponents:dateComponents toDate:tempDate options:0];
NSLog(#"target Date:%#",targetDate);
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"ddMMYYYY"];
NSString *sDate = [df stringFromDate:targetDate];
NSLog(#"sDate Date:%#",sDate);
[self LoadMagnumResult:sDate];
}

Answer 1

I'm assuming that the latest result cannot be in the future. In other words, the max date for "latest result" is today. I'm also assuming that a left swipe should increment the information until today is reached. If you want a left swipe to jump to today, then the code is even easier. Let me know if that's what you meant. Since I don't have your application, I just made an internal variable that stored a date called testDate. I also put a label on screen and called it outputLabel. You can modify the code to fit your needs.
Finally, I changed the methods to make the right swipe go back in time and the left swipe go forward in time. A user is already used to thinking of a right swipe as going backwards (back on a web browser, etc). Remember a right swipe starts on the left and ends on the right.
First, I would build a helper method to turn dates into strings:
- (NSString*)stringFromDate:(NSDate*)date
{
//Helper method to return a string from a date
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"dd/MM/yy"];
return [formatter stringFromDate:date];
}
This is my right swipe method. Notice how I use time intervals to increment dates. That can save you a few lines of code from your methods. Unless I'm wrong, it looks like you are trying to increment the date by 24 hours for each swipe. I also made a constant before these two methods so you don't have to search through your code if you want to change the days to increment per swipe.
#define kDaysPerSwipe 1
- (void)swipeRight:(UISwipeGestureRecognizer*)swipeRight
{
NSLog(#"right swipe received");
//Number of days to add
int numberOfDaysToAdd = kDaysPerSwipe;
//Generate a new date
NSDate *newDate = [self.testDate dateByAddingTimeInterval:-(60*60*24*numberOfDaysToAdd)];
//Store the new date
self.testDate = newDate;
//Output the new date
self.outputLabel.text = [self stringFromDate:self.testDate];
}
Here is my left swipe method. Notice how I compare the newDate to today and then only store the EARLIER date of the two before proceeding.
- (void)swipeLeft:(UISwipeGestureRecognizer*)swipeLeft
{
NSLog(#"left swipe received");
//Number of days to add
int numberOfDaysToAdd = kDaysPerSwipe;
//Generate a new date
NSDate *newDate = [self.testDate dateByAddingTimeInterval:(60*60*24*numberOfDaysToAdd)];
NSLog(#"newDate: %#", [self stringFromDate:newDate]);
//Compare newDate to today. Return whichever is earlier.
newDate = [[NSDate date] earlierDate:newDate];
self.testDate = newDate;
//Show the output on the screen
self.outputLabel.text = [self stringFromDate:self.testDate];
}