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Another common gesture is the two-finger pinch. It s used in a number of applications, including Mobile Safari, Mail, and Photos to let you zoom in (if you pinch apart) or zoom out (if you pinch together). Detecting pinches is pretty easy. First, when the gesture begins, we check to make sure there are two touches, because pinches are two-finger gestures. If there are two, we store the distance between them. Then, as the gesture progresses, we keep checking the distance between the user s fingers, and if the distance increases or decreases more than a certain amount, we know there s been a pinch. Create a new project in Xcode, again using the view-based application template, and call this one PinchMe. In this project and the next one, we re going to need to do some fairly standard analytic geometry to calculate such things as the distance between two points (in this project) and later the angle between two lines. Don t worry if you don t remember much geometry, we ve provided you with functions that will do the calculations for you. Look in the 13 PinchMe folder for two files, named CGPointUtils.h and CGPointUtils.c. Drag both of these to the Classes folder of your project. Feel free to use these utility functions in your own applications. The PinchMe application is only going to need a single outlet for a label, but it also needs an instance variable to hold the starting distance between the fingers and, as with the previous

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applications, a method for erasing the label. We also will define a constant that identifies the minimum change in distance between the fingers that constitutes a pinch. Expand the Classes folder, single-click PinchMeViewController.h, and make the following changes:

#import <UIKit/UIKit.h> #define kMinimumPinchDelta 100 @interface PinchMeViewController : UIViewController { IBOutlet UILabel *label; CGFloat initialDistance; } @property (nonatomic, retain) UILabel *label; @property CGFloat initialDistance; - (void)eraseLabel; @end

Figure 15-43. Modifying the new task The Tasks list should now show that the first task is complete and a new task has been assigned to the developer, as demonstrated in Figure 15-44.

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Now that we have our outlet, expand the Resources folder, and double-click PinchMeViewController.xib. In Interface Builder, make sure the view is set to accept multiple touches (look for the Multiple Touch Enabled checkbox on the attributes inspector), and drag a single label over to it. You can place, size, and format the label any way you want. When you re done with it, double-click the label, and delete the text it contains. Next, control-drag from the File s Owner icon to the label, and connect it to the label outlet. Save and close the nib, and go back to Xcode. In PinchMeViewController.m, make the following changes:

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#import "PinchMeViewController.h" #import "CGPointUtils.h" @implementation PinchMeViewController @synthesize label; @synthesize initialDistance; - (void)eraseLabel { label.text = @""; } - (BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations return (interfaceOrientation == UIInterfaceOrientationPortrait); } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview // Release anything that's not essential, such as cached data } - (void)dealloc {

Figure 15-44. A new task has been assigned to the developer. Edit this task, select the Enhancement action, enter a comment explaining that this is an enhancement as shown in Figure 15-45, and save the form.

[label release]; [super dealloc]; } #pragma mark - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { if ([touches count] == 2) { NSArray *twoTouches = [touches allObjects]; UITouch *first = [twoTouches objectAtIndex:0]; UITouch *second = [twoTouches objectAtIndex:1]; initialDistance = distanceBetweenPoints( [first locationInView:self.view], [second locationInView:self.view]); } } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { if ([touches count] == 2) { NSArray *twoTouches = [touches allObjects]; UITouch *first = [twoTouches objectAtIndex:0]; UITouch *second = [twoTouches objectAtIndex:1]; CGFloat currentDistance = distanceBetweenPoints( [first locationInView:self.view], [second locationInView:self.view]); if (initialDistance == 0) initialDistance = currentDistance; else if (currentDistance - initialDistance > kMinimumPinchDelta) { label.text = @"Outward Pinch"; [self performSelector:@selector(eraseLabel) withObject:nil afterDelay:1.6f]; } else if (initialDistance - currentDistance > kMinimumPinchDelta) { label.text = @"Inward Pinch"; [self performSelector:@selector(eraseLabel) withObject:nil afterDelay:1.6f]; } } } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { initialDistance = 0; } @end

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