Improve feel and fluidity of gesture recognition

ole · Jan 25, 2012 · e23e300 · e23e300
1 parent 30141a0
commit e23e300
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Showing 2 changed files with 18 additions and 7 deletions.
diff --git a/GestureRecognizers/ViewController.h b/GestureRecognizers/ViewController.h
@@ -8,7 +8,7 @@
 
 #import <UIKit/UIKit.h>
 
-@interface ViewController : UIViewController
+@interface ViewController : UIViewController <UIGestureRecognizerDelegate>
 
 @property (weak, nonatomic) IBOutlet UIImageView *imageView;
 

diff --git a/GestureRecognizers/ViewController.m b/GestureRecognizers/ViewController.m
@@ -23,20 +23,23 @@ - (void)viewDidLoad
 {
     [super viewDidLoad];
 
-    self.imageView.userInteractionEnabled = YES;
-
     UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panDetected:)];
-    [self.imageView addGestureRecognizer:panRecognizer];
+    [self.view addGestureRecognizer:panRecognizer];
 
     UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchDetected:)];
-    [self.imageView addGestureRecognizer:pinchRecognizer];
+    [self.view addGestureRecognizer:pinchRecognizer];
 
     UIRotationGestureRecognizer *rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationDetected:)];
-    [self.imageView addGestureRecognizer:rotationRecognizer];
+    [self.view addGestureRecognizer:rotationRecognizer];
 
     UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapDetected:)];
     tapRecognizer.numberOfTapsRequired = 2;
-    [self.imageView addGestureRecognizer:tapRecognizer];
+    [self.view addGestureRecognizer:tapRecognizer];
+
+    panRecognizer.delegate = self;
+    pinchRecognizer.delegate = self;
+    rotationRecognizer.delegate = self;
+    // We don't need a delegate for the tapRecognizer
 }
 
 - (void)viewDidUnload
@@ -112,4 +115,12 @@ - (void)tapDetected:(UITapGestureRecognizer *)tapRecognizer
     }];
 }
 
+
+#pragma mark - UIGestureRecognizerDelegate
+
+- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
+{
+    return YES;
+}
+
 @end