Merge pull request #1 from Jpro714/touch-effect

added button pressed effect on touch

GlossyButtons/GlossyButton.h

@@ -9,5 +9,6 @@
 #import <UIKit/UIKit.h>
 
 @interface GlossyButton : UIButton
+@property(strong, nonatomic)UIColor *myColor;
 - (id)initWithFrame:(CGRect)frame withBackgroundColor:(UIColor*)backgroundColor;
 @end

GlossyButtons/GlossyButton.m

@@ -16,6 +16,8 @@ - (id)initWithFrame:(CGRect)frame withBackgroundColor:(UIColor*)backgroundColor
     self = [super initWithFrame:frame];
     if (self) {
         // Initialization code
+        //save our color so we can alter it upon a touch event
+        self.myColor = backgroundColor;
         [self makeButtonShiny:self withBackgroundColor:backgroundColor];
     }
     return self;
@@ -56,4 +58,55 @@ - (void)makeButtonShiny:(GlossyButton*)button withBackgroundColor:(UIColor*)back
     [button setBackgroundColor:backgroundColor];
 }
 
+//When button is touched, grab our existing color and make it 20% darker (or lighter if its black)
+//We will return it to its original state when the touch is lifted and touchesEnded:withEvent: is called
+-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
+{
+    UIColor *newColor;
+    CGFloat red = 0.0, green = 0.0, blue = 0.0, alpha = 0.0, white = 0.0;
+
+    //Check if we're working with atleast iOS 5.0
+    if([self.myColor respondsToSelector:@selector(getRed:green:blue:alpha:)]) {
+        [self.myColor getRed:&red green:&green blue:&blue alpha:&alpha];
+        [self.myColor getWhite:&white alpha:&alpha];
+
+        //test if we're working with a grayscale, black or RGB color
+        if(!(red + green + blue) && white){
+            //grayscale
+            newColor = [UIColor colorWithWhite:white - 0.2 alpha:alpha];
+        } else if(!(red + green + blue) && !white) {
+            //black
+            newColor = [UIColor colorWithWhite:white + 0.2 alpha:alpha];
+        } else{
+            //RGB
+            newColor = [UIColor colorWithRed:red - 0.2 green:green - 0.2 blue:blue - 0.2 alpha:alpha];
+        }
+    } else if(CGColorGetNumberOfComponents(self.myColor.CGColor) == 4) {
+        //for earlier than ios 5
+        const CGFloat *components = CGColorGetComponents(self.myColor.CGColor);
+        red = components[0];
+        green = components[1];
+        blue = components[2];
+        alpha = components[3];
+
+        newColor = [UIColor colorWithRed:red - 0.2 green:green - 0.2 blue:blue - 0.2 alpha:alpha];
+    } else if(CGColorGetNumberOfComponents(self.myColor.CGColor) == 2){
+        //if we have a non-RGB color
+        CGFloat hue;
+        CGFloat saturation;
+        CGFloat brightness;
+        [self.myColor getHue:&hue saturation:&saturation brightness:&brightness alpha:&alpha];
+
+        newColor = [UIColor colorWithHue:hue - 0.2 saturation:saturation - 0.2 brightness:brightness - 0.2 alpha:alpha];
+    }
+
+    self.backgroundColor = newColor;
+
+}
+
+-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
+{
+    //Reset our button to its original color
+    self.backgroundColor = self.myColor;
+}
 @end