/*

     File: APLGestureRecognizerViewController.m

 Abstract: A view controller that manages a view and four gesture recognizers.

 The gesture recognizers recognize taps, right and left swipes, and rotation gestures respectively. When they recognize a gesture, the recognizers send a suitable message to the view controller, which in turn displays an appropriate image at the location of the gesture.

 For the purposes of example, the view contains a segmented control that can toggle recognition of left swipe gestures. The view controller maintains a reference to the left swipe gesture recognizer so that the recognizer can be added to and removed from the view as appropriate.

 Notice that recognizers ignore the exclusiveTouch setting of views. 

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 */

#import "APLGestureRecognizerViewController.h"

@interface APLGestureRecognizerViewController ()

@property (nonatomic, strong) IBOutlet UITapGestureRecognizer *tapRecognizer;

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

@property (nonatomic, strong) IBOutlet UIImageView *imageView;

@property (nonatomic, strong) IBOutlet UISegmentedControl *segmentedControl;

@end

@implementation APLGestureRecognizerViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    if ([self.segmentedControl selectedSegmentIndex] == 0) {

        [self.view addGestureRecognizer:self.swipeLeftRecognizer];

    }

    else {

        [self.view removeGestureRecognizer:self.swipeLeftRecognizer];        

    }

    // For illustrative purposes, set exclusive touch for the segmented control (see the ReadMe).

    [self.segmentedControl setExclusiveTouch:YES];

}

- (NSUInteger)supportedInterfaceOrientations {

    return UIInterfaceOrientationMaskAll;

}

- (IBAction)takeLeftSwipeRecognitionEnabledFrom:(UISegmentedControl *)aSegmentedControl {

    /*

     Add or remove the left swipe recogniser to or from the view depending on the selection in the segmented control.

     */

    if ([aSegmentedControl selectedSegmentIndex] == 0) {

        [self.view addGestureRecognizer:self.swipeLeftRecognizer];

    }

    else {

        [self.view removeGestureRecognizer:self.swipeLeftRecognizer];

    }

}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {

    // Disallow recognition of tap gestures in the segmented control.

    if ((touch.view == self.segmentedControl) && (gestureRecognizer == self.tapRecognizer)) {

        return NO;

    }

    return YES;

}

#pragma mark -

#pragma mark Responding to gestures

/*

 In response to a tap gesture, show the image view appropriately then make it fade out in place.

 */

- (IBAction)showGestureForTapRecognizer:(UITapGestureRecognizer *)recognizer {

    CGPoint location = [recognizer locationInView:self.view];

    [self drawImageForGestureRecognizer:recognizer atPoint:location];

    [UIView animateWithDuration:0.5 animations:^{

        self.imageView.alpha = 0.0;

    }];

}

/*

 In response to a swipe gesture, show the image view appropriately then move the image view in the direction of the swipe as it fades out.

 */

- (IBAction)showGestureForSwipeRecognizer:(UISwipeGestureRecognizer *)recognizer {

    CGPoint location = [recognizer locationInView:self.view];

    [self drawImageForGestureRecognizer:recognizer atPoint:location];

    if (recognizer.direction == UISwipeGestureRecognizerDirectionLeft) {

        location.x -= 220.0;

    }

    else {

        location.x += 220.0;

    }

    [UIView animateWithDuration:0.5 animations:^{

        self.imageView.alpha = 0.0;

        self.imageView.center = location;

    }];

}

/*

 In response to a rotation gesture, show the image view at the rotation given by the recognizer. At the end of the gesture, make the image fade out in place while rotating back to horizontal.

 */

- (IBAction)showGestureForRotationRecognizer:(UIRotationGestureRecognizer *)recognizer {

    CGPoint location = [recognizer locationInView:self.view];

    CGAffineTransform transform = CGAffineTransformMakeRotation([recognizer rotation]);

    self.imageView.transform = transform;

    [self drawImageForGestureRecognizer:recognizer atPoint:location];

    /*

     If the gesture has ended or is cancelled, begin the animation back to horizontal and fade out.

     */

    if (([recognizer state] == UIGestureRecognizerStateEnded) || ([recognizer state] == UIGestureRecognizerStateCancelled)) {

        [UIView animateWithDuration:0.5 animations:^{

            self.imageView.alpha = 0.0;

            self.imageView.transform = CGAffineTransformIdentity;

        }];

    }

}

#pragma mark -

#pragma mark Drawing the image view

/*

 Set the appropriate image for the image view for the given gesture recognizer, move the image view to the given point, then dispay the image view by setting its alpha to 1.0.

 */

- (void)drawImageForGestureRecognizer:(UIGestureRecognizer *)recognizer atPoint:(CGPoint)centerPoint {

    NSString *imageName;

    if ([recognizer isMemberOfClass:[UITapGestureRecognizer class]]) {

        imageName = @"tap.png";

    }

    else if ([recognizer isMemberOfClass:[UIRotationGestureRecognizer class]]) {

        imageName = @"rotation.png";

    }

    else if ([recognizer isMemberOfClass:[UISwipeGestureRecognizer class]]) {

        imageName = @"swipe.png";

    }

    self.imageView.image = [UIImage imageNamed:imageName];

    self.imageView.center = centerPoint;

    self.imageView.alpha = 1.0; 

}

@end