/* |
File: APLViewController.m |
Abstract: The main view controller for this application. The gesture recognizers for the view's pieces are set up in the storyboard. |
Version: 2.0 |
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Copyright (C) 2013 Apple Inc. All Rights Reserved. |
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*/ |
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#import "APLViewController.h" |
#import <QuartzCore/QuartzCore.h> |
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@interface APLViewController () |
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// Views the user can move. |
@property (nonatomic, weak) IBOutlet UIImageView *firstPieceView; |
@property (nonatomic, weak) IBOutlet UIImageView *secondPieceView; |
@property (nonatomic, weak) IBOutlet UIImageView *thirdPieceView; |
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@property (nonatomic, weak) UIView *pieceForReset; |
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@end |
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@implementation APLViewController |
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#pragma mark - Utility methods |
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/** |
Scale and rotation transforms are applied relative to the layer's anchor point this method moves a gesture recognizer's view's anchor point between the user's fingers. |
*/ |
- (void)adjustAnchorPointForGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer |
{ |
if (gestureRecognizer.state == UIGestureRecognizerStateBegan) { |
UIView *piece = gestureRecognizer.view; |
CGPoint locationInView = [gestureRecognizer locationInView:piece]; |
CGPoint locationInSuperview = [gestureRecognizer locationInView:piece.superview]; |
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piece.layer.anchorPoint = CGPointMake(locationInView.x / piece.bounds.size.width, locationInView.y / piece.bounds.size.height); |
piece.center = locationInSuperview; |
} |
} |
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/** |
Display a menu with a single item to allow the piece's transform to be reset. |
*/ |
- (IBAction |
)showResetMenu:(UILongPressGestureRecognizer *)gestureRecognizer |
{ |
if ([gestureRecognizer state] == UIGestureRecognizerStateBegan) { |
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[self becomeFirstResponder]; |
self.pieceForReset = [gestureRecognizer view]; |
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/* |
Set up the reset menu. |
*/ |
NSString *menuItemTitle = NSLocalizedString(@"Reset", @"Reset menu item title"); |
UIMenuItem *resetMenuItem = [[UIMenuItem alloc] initWithTitle:menuItemTitle action:@selector(resetPiece:)]; |
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UIMenuController *menuController = [UIMenuController sharedMenuController]; |
[menuController setMenuItems:@[resetMenuItem]]; |
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CGPoint location = [gestureRecognizer locationInView:[gestureRecognizer view]]; |
CGRect menuLocation = CGRectMake(location.x, location.y, 0, 0); |
[menuController setTargetRect:menuLocation inView:[gestureRecognizer view]]; |
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[menuController setMenuVisible:YES animated:YES]; |
} |
} |
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/** |
Animate back to the default anchor point and transform. |
*/ |
- (void)resetPiece:(UIMenuController *)controller |
{ |
UIView *pieceForReset = self.pieceForReset; |
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CGPoint centerPoint = CGPointMake(CGRectGetMidX(pieceForReset.bounds), CGRectGetMidY(pieceForReset.bounds)); |
CGPoint locationInSuperview = [pieceForReset convertPoint:centerPoint toView:[pieceForReset superview]]; |
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[[pieceForReset layer] setAnchorPoint:CGPointMake(0.5, 0.5)]; |
[pieceForReset setCenter:locationInSuperview]; |
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[UIView beginAnimations:nil context:nil]; |
[pieceForReset setTransform:CGAffineTransformIdentity]; |
[UIView commitAnimations]; |
} |
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// UIMenuController requires that we can become first responder or it won't display |
- (BOOL)canBecomeFirstResponder |
{ |
return YES; |
} |
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#pragma mark - Touch handling |
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/** |
Shift the piece's center by the pan amount. |
Reset the gesture recognizer's translation to {0, 0} after applying so the next callback is a delta from the current position. |
*/ |
- (IBAction)panPiece:(UIPanGestureRecognizer *)gestureRecognizer |
{ |
UIView *piece = [gestureRecognizer view]; |
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[self adjustAnchorPointForGestureRecognizer:gestureRecognizer]; |
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if ([gestureRecognizer state] == UIGestureRecognizerStateBegan || [gestureRecognizer state] == UIGestureRecognizerStateChanged) { |
CGPoint translation = [gestureRecognizer translationInView:[piece superview]]; |
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[piece setCenter:CGPointMake([piece center].x + translation.x, [piece center].y + translation.y)]; |
[gestureRecognizer setTranslation:CGPointZero inView:[piece superview]]; |
} |
} |
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/** |
Rotate the piece by the current rotation. |
Reset the gesture recognizer's rotation to 0 after applying so the next callback is a delta from the current rotation. |
*/ |
- (IBAction)rotatePiece:(UIRotationGestureRecognizer *)gestureRecognizer |
{ |
[self adjustAnchorPointForGestureRecognizer:gestureRecognizer]; |
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if ([gestureRecognizer state] == UIGestureRecognizerStateBegan || [gestureRecognizer state] == UIGestureRecognizerStateChanged) { |
[gestureRecognizer view].transform = CGAffineTransformRotate([[gestureRecognizer view] transform], [gestureRecognizer rotation]); |
[gestureRecognizer setRotation:0]; |
} |
} |
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/** |
Scale the piece by the current scale. |
Reset the gesture recognizer's rotation to 0 after applying so the next callback is a delta from the current scale. |
*/ |
- (IBAction)scalePiece:(UIPinchGestureRecognizer *)gestureRecognizer |
{ |
[self adjustAnchorPointForGestureRecognizer:gestureRecognizer]; |
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if ([gestureRecognizer state] == UIGestureRecognizerStateBegan || [gestureRecognizer state] == UIGestureRecognizerStateChanged) { |
[gestureRecognizer view].transform = CGAffineTransformScale([[gestureRecognizer view] transform], [gestureRecognizer scale], [gestureRecognizer scale]); |
[gestureRecognizer setScale:1]; |
} |
} |
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/** |
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 != self.firstPieceView && gestureRecognizer.view != self.secondPieceView && gestureRecognizer.view != self.thirdPieceView) { |
return NO; |
} |
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// If the gesture recognizers are on different views, don't allow simultaneous recognition. |
if (gestureRecognizer.view != otherGestureRecognizer.view) { |
return NO; |
} |
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// If either of the gesture recognizers is the long press, don't allow simultaneous recognition. |
if ([gestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]] || [otherGestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]]) { |
return NO; |
} |
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return YES; |
} |
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@end |