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POHow to swipe within a view controller within in an an array of strings?
 

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  1. POHow to swipe within a view controller within in an an array of strings?
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    <p>My app has so many strings in an <code>NSArray</code> and the user usually can click on a button which is linked with an ib action to go either next or previous. When they click next or previous the text within a <code>TextView</code> changes to the next or previous string within the array. I want the user to be able to swipe within the <code>TextView</code> to go either next or previous. I've learned a little bit about how to recognize swipes but that requires a whole new <code>class</code> which inherits <code>UITextView</code> while my other class that contains the array and ib actions inherit a <code>UIViewcontroller</code>. I'm going to post what my code looks like and I just want to know how to connect either the swipe class or have within the action to recognize the swipe. Thanks for your time!</p> <pre><code>//DateIdeasViewController.m #import "DateIdeasViewController.h" @interface DateIdeasViewController () @end @implementation DateIdeasViewController @synthesize labelsText; @synthesize textView; @synthesize adView; - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self; } - (void) bannerViewDidLoadAd:(ADBannerView *)banner { [adView setHidden:NO]; NSLog(@"Showing"); } - (void) bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error { [adView setHidden:YES]; NSLog(@"Hidden"); } -(void)viewDidLoad { adView.delegate = self; [adView setHidden:YES]; titles = [NSArray arrayWithObjects: //Date ideas @"Some date ideas may be seasonal!", nil]; step= 0; textView.text = [titles objectAtIndex:step]; labelsText.text = [NSString stringWithFormat:@"%d/%d", step+1, titles.count]; } -(IBAction) nextclicked:(id)sender{ if (step&lt;titles.count-1) { step++; } else { step= 0; } textView.text = [titles objectAtIndex:step]; labelsText.text = [NSString stringWithFormat:@"%d/%d", step+1, titles.count]; } -(IBAction) prevClicked:(id)sender{ if (step&gt;0) { step--; } else { step =titles.count-1; } textView.text = [titles objectAtIndex:step]; labelsText.text = [NSString stringWithFormat:@"%d/%d", step+1, titles.count]; } -(IBAction) randomClicked:(id)sender{ step = 1+arc4random() %(titles.count-1); textView.text = [titles objectAtIndex:step]; labelsText.text = [NSString stringWithFormat:@"%d/%d", step+1, titles.count]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } -(IBAction) favorite:(id)sender{ NSMutableArray *array = [NSMutableArray arrayWithArray:[[NSUserDefaults standardUserDefaults] objectForKey:@"favorites"]]; [array addObject:textView.text]; [[NSUserDefaults standardUserDefaults] setObject:array forKey:@"favorites"]; } @end </code></pre> <p>SwipeableTextView.h</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #define kMinimumGestureLength 25 #define kMaximumVariance 5 typedef enum swipeDirection { kSwipeNone, kSwipeLeft, kSwipeRight } tSwipeDirection; @interface SwipeableTextView : UITextView { CGPoint gestureStartPoint; tSwipeDirection swipeDirection; } @end </code></pre> <p>SwipeableTextView.m</p> <pre><code>#import "SwipeableTextView.h" @implementation SwipeableTextView - (id)initWithFrame:(CGRect)frame; { self = [super initWithFrame:frame]; if (self) { // Initialization code } return self; } - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { [super touchesBegan:touches withEvent:event]; swipeDirection = kSwipeNone; UITouch *touch =[touches anyObject]; gestureStartPoint = [touch locationInView:self]; } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { [super touchesMoved:touches withEvent:event]; UITouch *touch = [touches anyObject]; CGPoint currentPosition = [touch locationInView:self]; CGFloat deltaX = fabsf(gestureStartPoint.x - currentPosition.x); CGFloat deltaY = fabsf(gestureStartPoint.y - currentPosition.y); // Check if we already started a swipe in a particular direction // Don't let the user reverse once they get going if (deltaX &gt;= kMinimumGestureLength &amp;&amp; deltaY &lt;= kMaximumVariance &amp;&amp; swipeDirection == kSwipeNone) { if (gestureStartPoint.x &lt; currentPosition.x) { swipeDirection = kSwipeRight; } else { swipeDirection = kSwipeLeft; } } } -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { if (swipeDirection == kSwipeRight) { } else if (swipeDirection == kSwipeLeft) { NSLog(@"Swipe left"); } [super touchesEnded:touches withEvent:event]; } @end </code></pre>
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