swipeGestureRecognizer not working when restarting app in Ios Simulator - ios-simulator

Question

Im toying around with SwipeGestureRecognizer.
It´s working as I expect, but when I exit the app in the simulator and run it again, the SwipeGestureRecognizer no longer responds. If i run it again after quitting iOS simulator, it works.
This is what I have tried:
#import <UIKit/UIKit.h>
#interface swipeTestUI : UIViewController
#property (strong, nonatomic) IBOutlet UIImageView *imageView;
- (IBAction)mangeSwipeControl:(UIGestureRecognizer*)sender;
#end
Implementation file:
#import "swipeTestUI.h"
#interface swipeTestUI ()
#end
#implementation swipeTestUI
#synthesize imageView;
int listOfImages = 0;
- (IBAction)mangeSwipeControl:(UIGestureRecognizer *)sender {
NSLog(#"swipe ok");
NSArray *images=[[NSArray alloc]initWithObjects:
#"1.png",
#"2.png",
#"3.png",
#"4.png",
#"5.png",
#"5.png",nil];
UISwipeGestureRecognizerDirection direction = [(UISwipeGestureRecognizer *) sender direction];
switch (direction) {
case UISwipeGestureRecognizerDirectionLeft:
listOfImages++;
break;
case UISwipeGestureRecognizerDirectionRight:
listOfImages--;
break;
default:
break;
}
listOfImages = (listOfImages < 0) ? ([images count] -1):listOfImages % [images count];
imageView.image = [UIImage imageNamed:[images objectAtIndex:listOfImages]];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{
return (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight);
}

Answer 1

I think this is an iOS simulator issue. I have modified the code a bit, I think its more effective
the header file is the same, the implementation file is as followed.
-(IBAction)manageSwipeControl:(UISwipeGestureRecognizer *)gesture {
NSArray *images=[[NSArray alloc]initWithObjects:
#"1.png",
#"2.png",
#"3.png",
#"4.png",
#"5.png",
#"6.png",nil];
if (gesture.direction == UISwipeGestureRecognizerDirectionLeft)
{
listOfImages++;
}
else if (gesture.direction == UISwipeGestureRecognizerDirectionRight)
{
listOfImages--;
}
listOfImages = (listOfImages < 0) ? ([images count] -1):listOfImages % [images count];
imageView.image = [UIImage imageNamed:[images objectAtIndex:listOfImages]];
//[self.imageView removeGestureRecognizer:sender];
}
Works like a charm. Funny thing. When I quit the application in the iOS simulator, and reopen it. It still works. If I quit and remove it from iOS simulator memory - it does not. If I launch the iOS simulator directly from the OS, no problem what so ever. I can both quit and remove it from memory, and it still works.
Still, a fun way to spend on a rainy weekend. Hope this info is useful to other new developers like myself.