+ Some basic image editing functionality.

Classes/BITImageAnnotationViewController.m

@@ -7,12 +7,19 @@
 //
 
 #import "BITImageAnnotationViewController.h"
+#import "BITImageAnnotation.h"
+#import "BITRectangleImageAnnotation.h"
 
 @interface BITImageAnnotationViewController ()
 
 @property (nonatomic, strong) UIImageView *imageView;
 @property (nonatomic, strong) UISegmentedControl *editingControls;
-@property (nonatomic, strong) NSMutableArray *layers;
+@property (nonatomic, strong) NSMutableArray *objects;
+@property (nonatomic, strong) UIPanGestureRecognizer *panRecognizer;
+@property (nonatomic, strong) UITapGestureRecognizer *tapRecognizer;
+
+@property (nonatomic) CGPoint panStart;
+@property (nonatomic,strong) BITImageAnnotation *currentAnnotation;
 
 @end
 
@@ -41,11 +48,78 @@
   
   self.imageView.image = self.image;
   self.imageView.contentMode = UIViewContentModeScaleAspectFit;
+  
+  
+  [self.view addSubview:self.imageView];
+  self.imageView.frame = self.view.bounds;
+  
+  
+  self.tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)];
+  self.panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panned:)];
+  
+  [self.tapRecognizer requireGestureRecognizerToFail:self.panRecognizer];
+  
+  [self.view addGestureRecognizer:self.tapRecognizer];
+  [self.view addGestureRecognizer:self.panRecognizer];
+  
+  self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc ] initWithTitle:@"Discard" style:UIBarButtonItemStyleBordered target:self action:@selector(discard:)];
+  self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc ] initWithTitle:@"Save" style:UIBarButtonItemStyleBordered target:self action:@selector(save:)];
+
 	// Do any additional setup after loading the view.
 }
 
 -(void)editingAction:(id)sender {
   
+}
+
+- (BITImageAnnotation *)annotationForCurrentMode {
+  if (self.editingControls.selectedSegmentIndex == 0){
+    return [[BITRectangleImageAnnotation alloc] initWithFrame:CGRectZero];
+  } else {
+    return [[BITImageAnnotation alloc] initWithFrame:CGRectZero];
+  }
+}
+
+#pragma mark - Actions
+
+- (void)discard:(id)sender {
+  [self.delegate annotationControllerDidCancel:self];
+  [self dismissModalViewControllerAnimated:YES];
+}
+
+- (void)save:(id)sender {
+  UIImage *image = [self extractImage];
+  [self.delegate annotationController:self didFinishWithImage:image];
+  [self dismissModalViewControllerAnimated:YES];
+}
+
+- (UIImage *)extractImage {
+  UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, YES, 0.0);
+  CGContextRef ctx = UIGraphicsGetCurrentContext();
+  [self.view.layer renderInContext:ctx];
+  UIImage *renderedImageOfMyself = UIGraphicsGetImageFromCurrentImageContext();
+  UIGraphicsEndImageContext();
+  return renderedImageOfMyself;
+}
+
+#pragma mark - Gesture Handling
+
+- (void)panned:(UIPanGestureRecognizer *)gestureRecognizer {
+  if (gestureRecognizer.state == UIGestureRecognizerStateBegan){
+    self.currentAnnotation = [self annotationForCurrentMode];
+    
+    [self.view insertSubview:self.currentAnnotation aboveSubview:self.imageView];
+    self.panStart = [gestureRecognizer locationInView:self.imageView];
+  } else if (gestureRecognizer.state == UIGestureRecognizerStateChanged){
+    CGPoint bla = [gestureRecognizer translationInView:self.imageView];
+    self.currentAnnotation.frame = CGRectMake(self.panStart.x, self.panStart.y, bla.x, bla.y);
+  }
+  
+}
+
+-(void)tapped:(UITapGestureRecognizer *)gestureRecognizer {
+  
+  
 }
 
 - (void)didReceiveMemoryWarning