From a47da4d9f0210b13448cdb2452a2e0d17e2ad477 Mon Sep 17 00:00:00 2001
From: makowildcat <makowildcat@gmail.com>
Date: Thu, 10 Apr 2014 12:13:01 +0200
Subject: [PATCH] Image navigation.

---
 Flikrkr/ReaderView.m | 52 ++++++++++++++++++++++++++++++++++++--------
 1 file changed, 43 insertions(+), 9 deletions(-)

diff --git a/Flikrkr/ReaderView.m b/Flikrkr/ReaderView.m
index 3327699..7728b5c 100644
--- a/Flikrkr/ReaderView.m
+++ b/Flikrkr/ReaderView.m
@@ -8,6 +8,12 @@
 
 #import "ReaderView.h"
 
+@interface ReaderView ()
+
+@property (nonatomic, assign) int currentIndex;
+
+@end
+
 @implementation ReaderView
 
 - (id)initWithFrame:(CGRect)frame
@@ -20,16 +26,44 @@
 }
 
 /*
-// Only override drawRect: if you perform custom drawing.
-// An empty implementation adversely affects performance during animation.
-- (void)drawRect:(CGRect)rect
-{
-    // Drawing code
-}
-*/
+ // Only override drawRect: if you perform custom drawing.
+ // An empty implementation adversely affects performance during animation.
+ - (void)drawRect:(CGRect)rect
+ {
+ // Drawing code
+ }
+ */
 -(void)displayPageAtIndex:(int)index
 {
-    UIView * view = [self.delegate pageAtIndex:index];
-    [self addSubview:view];
+    if (index >= 0 && index < [self.delegate numberOfPages]) {
+        UIView * view = [self.delegate pageAtIndex:index];
+        [self addSubview:view];
+        self.currentIndex = index;
+    }
+}
+- (void)layoutSubviews
+{
+    if (!self.gestureRecognizers.count) {
+        UISwipeGestureRecognizer * previousPageRecognizer =
+        [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(previousPage)];
+        previousPageRecognizer.direction = UISwipeGestureRecognizerDirectionRight;
+        [self addGestureRecognizer:previousPageRecognizer];
+        
+        UISwipeGestureRecognizer * nextPageRecognizer =
+        [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(nextPage)];
+        nextPageRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
+        [self addGestureRecognizer:nextPageRecognizer];
+        
+        self.userInteractionEnabled = YES;
+    }
+}
+
+- (void) previousPage
+{
+    [self displayPageAtIndex:self.currentIndex-1];
+}
+- (void) nextPage
+{
+    [self displayPageAtIndex:self.currentIndex+1];
 }
 @end