GestureImageView.h

#import <UIKit/UIKit.h>


@interface GestureImageView : UIImageView <UIGestureRecognizerDelegate> {

}

@end

GestureImageView.m

#import "GestureImageView.h"
#import <QuartzCore/QuartzCore.h>


@implementation GestureImageView


- (id)initWithImage:(UIImage *)image {
    if ((self = [super initWithImage:image])) {
        self.userInteractionEnabled = YES;

        UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc]
                                                        initWithTarget:self action:@selector(handlePanGesture:)];
        [panGestureRecognizer setDelegate:self];
        [self addGestureRecognizer:panGestureRecognizer];
        [panGestureRecognizer release];
        
        UIRotationGestureRecognizer *rotationGestureRecognizer = [[UIRotationGestureRecognizer alloc]
                                                                  initWithTarget:self action:@selector(handleRotationGesture:)];
        [rotationGestureRecognizer setDelegate:self];
        [self addGestureRecognizer:rotationGestureRecognizer];
        [rotationGestureRecognizer release];
        
        UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc]
                                                            initWithTarget:self action:@selector(handlePinchGesture:)];
        [self addGestureRecognizer:pinchGestureRecognizer];
        [pinchGestureRecognizer release];


        CALayer *layer = [self layer];

        // 青い線で枠を囲む処理
        [layer setBorderWidth:1.0f];
        [layer setBorderColor:[[UIColor blueColor] CGColor]];
    }
    return self;
}


- (void)handlePanGesture:(UIPanGestureRecognizer *)gestureRecognizer {
    UIView *view = [gestureRecognizer view];
    
    if ([gestureRecognizer state] == UIGestureRecognizerStateBegan ||
        [gestureRecognizer state] == UIGestureRecognizerStateChanged) {
        CGPoint translation = [gestureRecognizer translationInView:[view superview]];
        
        [view setCenter:CGPointMake([view center].x + translation.x, [view center].y + translation.y)];
        [gestureRecognizer setTranslation:CGPointZero inView:[view superview]];
    }
}


- (void)handleRotationGesture:(UIRotationGestureRecognizer *)gestureRecognizer {
    if ([gestureRecognizer state] == UIGestureRecognizerStateBegan ||
        [gestureRecognizer state] == UIGestureRecognizerStateChanged) {
        [gestureRecognizer view].transform = CGAffineTransformRotate([[gestureRecognizer view] transform], [gestureRecognizer rotation]);
        [gestureRecognizer setRotation:0];
    }
}


- (void)handlePinchGesture:(UIPinchGestureRecognizer *)gestureRecognizer {
    if ([gestureRecognizer state] == UIGestureRecognizerStateBegan ||
        [gestureRecognizer state] == UIGestureRecognizerStateChanged) {
        [gestureRecognizer view].transform = CGAffineTransformScale([[gestureRecognizer view] transform], [gestureRecognizer scale], [gestureRecognizer scale]);
        [gestureRecognizer setScale:1];
    }
}


// ensure that the pinch, pan and rotate gesture recognizers on a particular view can all recognize simultaneously
// prevent other gesture recognizers from recognizing simultaneously
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    /*
     // if the gesture recognizers's view isn't one of our pieces, don't allow simultaneous recognition
     if (gestureRecognizer.view != firstPieceView && gestureRecognizer.view != secondPieceView && gestureRecognizer.view != thirdPieceView)
     return NO;
     */    
    // if the gesture recognizers are on different views, don't allow simultaneous recognition
    if (gestureRecognizer.view != otherGestureRecognizer.view)
        return NO;
    
    return YES;
}


/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

- (void)dealloc {
    [super dealloc];
}


@end