Clash Royale CLAN TAG#URR8PPP

Swipe Gesture issue

i have added two swipegesture on my image view .one for right and one for left. all i want is that when use click on any image and swipe it in left or right direction the image change accordingly as we do in our phone gallery. but when i swipe to left or right only one time image change after that nothing happens. all these images are coming from array and array name is getdataarray. here is my code

.h file

@property (strong, nonatomic) IBOutlet UISwipeGestureRecognizer *rightgesture;

@property (strong, nonatomic) IBOutlet UISwipeGestureRecognizer *leftgesture;
- (IBAction)handleswipe:(UISwipeGestureRecognizer *)sender;


.m file

-(void)viewdidload


_rightgesture= [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleswipe:)];

_leftgesture= [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleswipe:)];


- (IBAction)handleswipe:(UISwipeGestureRecognizer *)sender {

int imageindex = (int) selectedimageindex;

UISwipeGestureRecognizerDirection direction = [(UISwipeGestureRecognizer *) sender direction];

switch (direction)

case UISwipeGestureRecognizerDirectionLeft:
imageindex++;
break;
case UISwipeGestureRecognizerDirectionRight:
imageindex--;
break;

default:
break;


if (imageindex > -1 || imageindex < getdataarray.count)
[fullimageview sd_setImageWithURL:[getdataarray objectAtIndex: imageindex] placeholderImage:[UIImage imageNamed:@"placeholder.png"]];



2 Answers
2

what is selectimageIndex ? I grass the issue from selectimageIndex ;

Because you swipe the imageview once , the method 'handleswipe:' will run a once . so imageindex allways equal selectimageIndex . Please break a point to look the imageindex value .

--

-(void)viewdidload


_rightgesture= [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleswipe:)];

_leftgesture= [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleswipe:)];

// this code changed. _imageindex is global property .
_imageindex = (int) selectedimageindex;


- (IBAction)handleswipe:(UISwipeGestureRecognizer *)sender

UISwipeGestureRecognizerDirection direction = [(UISwipeGestureRecognizer *) sender direction];

switch (direction)

case UISwipeGestureRecognizerDirectionLeft:
if (_imageindex<getdataarray.count) _imageindex++; break;
case UISwipeGestureRecognizerDirectionRight:
if (_imageindex>0)_imageindex--; break;
default: break;


if (_imageindex > -1 && _imageindex < getdataarray.count)
[fullimageview sd_setImageWithURL:[getdataarray objectAtIndex:_imageindex] placeholderImage:[UIImage imageNamed:@"placeholder.png"]];




Issue is with when you reach to imageindex ==0 you should stop decrement and when you are index == getdataarray.count you should stop increment

- (IBAction)handleswipe:(UISwipeGestureRecognizer *)sender {

int imageindex = (int) selectedimageindex;

UISwipeGestureRecognizerDirection direction = [(UISwipeGestureRecognizer *) sender direction];

switch (direction)

case UISwipeGestureRecognizerDirectionLeft:
if imageindex<0

imageindex++;

imageindex++;
break;
case UISwipeGestureRecognizerDirectionRight:
if imageindex>getdataarray.count

imageindex--;


break;

default:
break;


if (imageindex > -1 && imageindex < getdataarray.count)
[fullimageview sd_setImageWithURL:[getdataarray objectAtIndex: imageindex] placeholderImage:[UIImage imageNamed:@"placeholder.png"]];



And you should Use && operator instead of OR operator

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