Merge pull request #19 from xinsight/increase-touch-area

increase touch area if checkbox is smaller than 44pt

Classes/BEMCheckBox.h

@@ -118,6 +118,10 @@ typedef NS_ENUM(NSInteger, BEMAnimationType) {
  */
 @property (nonatomic) BEMAnimationType offAnimationType;
 
+/** If the checkbox width or height is smaller than this value, the touch area will be increased. Allows for visually small checkboxes to still be easily tapped. Default: (44, 44)
+ */
+@property (assign, nonatomic) IBInspectable CGSize minimumTouchSize;
+
 /** Set the state of the check box to On or Off, optionally animating the transition.
  */
 - (void)setOn:(BOOL)on animated:(BOOL)animated;

Classes/BEMCheckBox.m

@@ -59,6 +59,7 @@ - (void)commonInit {
     _tintColor = [UIColor lightGrayColor];
     _lineWidth = 2.0;
     _animationDuration = 0.5;
+    _minimumTouchSize = CGSizeMake(44, 44);
     _onAnimationType = BEMAnimationTypeStroke;
     _offAnimationType = BEMAnimationTypeStroke;
     self.backgroundColor = [UIColor clearColor];
@@ -173,6 +174,28 @@ - (void)handleTapCheckBox:(UITapGestureRecognizer *)recognizer {
 }
 
 #pragma  mark - Helper methods -
+
+#pragma mark Increase touch area
+- (BOOL) pointInside:(CGPoint)point withEvent:(UIEvent *)event;
+{
+    BOOL found = [super pointInside:point withEvent:event];
+
+    CGSize minimumSize = self.minimumTouchSize;
+    CGFloat width = self.bounds.size.width;
+    CGFloat height = self.bounds.size.height;
+
+    if (found == NO && (width < minimumSize.width || height < minimumSize.height)) {
+        CGFloat increaseWidth = minimumSize.width - width;
+        CGFloat increaseHeight = minimumSize.height - height;
+
+        CGRect rect = CGRectInset(self.bounds, (-increaseWidth / 2), (-increaseHeight / 2));
+
+        found = CGRectContainsPoint(rect, point);
+    }
+
+    return found;
+}
+
 #pragma mark Drawings
 - (void)drawRect:(CGRect)rect {
     [self setOn:self.on animated:NO];