add color mixing feature

Author: candyan

Source/Extend/UIColor/UIColor+YAColorMixing.h

@@ -0,0 +1,15 @@
+//
+//  UIColor+YAColorMixing.h
+//
+//
+//  Created by liuyan on 7/8/15.
+//
+//
+
+#import <UIKit/UIKit.h>
+
+@interface UIColor (YAColorMixing)
+
+- (UIColor *)colorByAddingColor:(UIColor *)addingColor;
+
+@end

Source/Extend/UIColor/UIColor+YAColorMixing.m

@@ -0,0 +1,34 @@
+//
+//  UIColor+YAColorMixing.m
+//
+//
+//  Created by liuyan on 7/8/15.
+//
+//
+
+#import "UIColor+YAColorMixing.h"
+
+@implementation UIColor (YAColorMixing)
+
+- (UIColor *)colorByAddingColor:(UIColor *)addingColor
+{
+    CGFloat upperRed, upperGreen, upperBlue, upperAlpha = 0;
+    CGFloat underRed, underGreen, underBlue, underAlpha = 0;
+    CGFloat resultRed, resultGreen, resultBlue, resultAlpha = 0;
+    
+    [addingColor getRed:&upperRed green:&upperGreen blue:&upperBlue alpha:&upperAlpha];
+    [self getRed:&underRed green:&underGreen blue:&underBlue alpha:&underAlpha];
+
+    resultRed = upperRed * upperAlpha + underRed * underAlpha * (1 - upperAlpha);
+    resultGreen = upperGreen * upperAlpha + underGreen * underAlpha * (1 - upperAlpha);
+    resultBlue = upperBlue * upperAlpha + underBlue * underAlpha * (1 - upperAlpha);
+    resultAlpha = 1 - (1 - upperAlpha) * (1 - underAlpha);
+
+    resultRed /= resultAlpha;
+    resultGreen /= resultAlpha;
+    resultBlue /= resultAlpha;
+
+    return [UIColor colorWithRed:resultRed green:resultGreen blue:resultBlue alpha:resultAlpha];
+}
+
+@end

Source/YAUIKit.h

@@ -23,6 +23,8 @@
 
 #import "UIFont+YAUIKit.h"
 
+#import "UIColor+YAColorMixing.h"
+
 #import "UIImage+YAColor.h"
 #import "UIImage+YAImageTransform.h"
 #import "UIImage+YAUIKit.h"

YAUIKit/YAUIKit.xcodeproj/project.pbxproj

@@ -88,6 +88,7 @@
 		75900D4819E445E500C05D28 /* YASkinManager.m in Sources */ = {isa = PBXBuildFile; fileRef = 75900D4719E445E500C05D28 /* YASkinManager.m */; };
 		75900D4C19E448F100C05D28 /* YATableDataSource.m in Sources */ = {isa = PBXBuildFile; fileRef = 75900D4B19E448F100C05D28 /* YATableDataSource.m */; };
 		75C15C2419EA70AA00E5C341 /* UIApplication+YAKeyboardWindow.m in Sources */ = {isa = PBXBuildFile; fileRef = 75C15C2319EA70AA00E5C341 /* UIApplication+YAKeyboardWindow.m */; };
+		75D8F39F1B4D023300EBC7E9 /* UIColor+YAColorMixing.m in Sources */ = {isa = PBXBuildFile; fileRef = 75D8F39E1B4D023300EBC7E9 /* UIColor+YAColorMixing.m */; };
 		75F9D1321B2A8DF800972CB5 /* UITableView+YAReusableCell.m in Sources */ = {isa = PBXBuildFile; fileRef = 75F9D1311B2A8DF800972CB5 /* UITableView+YAReusableCell.m */; };
 /* End PBXBuildFile section */
 
@@ -215,6 +216,8 @@
 		75900D4B19E448F100C05D28 /* YATableDataSource.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = YATableDataSource.m; sourceTree = "<group>"; };
 		75C15C2219EA70AA00E5C341 /* UIApplication+YAKeyboardWindow.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "UIApplication+YAKeyboardWindow.h"; sourceTree = "<group>"; };
 		75C15C2319EA70AA00E5C341 /* UIApplication+YAKeyboardWindow.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = "UIApplication+YAKeyboardWindow.m"; sourceTree = "<group>"; };
+		75D8F39D1B4D023300EBC7E9 /* UIColor+YAColorMixing.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "UIColor+YAColorMixing.h"; sourceTree = "<group>"; };
+		75D8F39E1B4D023300EBC7E9 /* UIColor+YAColorMixing.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = "UIColor+YAColorMixing.m"; sourceTree = "<group>"; };
 		75F9D1301B2A8DF800972CB5 /* UITableView+YAReusableCell.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "UITableView+YAReusableCell.h"; sourceTree = "<group>"; };
 		75F9D1311B2A8DF800972CB5 /* UITableView+YAReusableCell.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = "UITableView+YAReusableCell.m"; sourceTree = "<group>"; };
 /* End PBXFileReference section */
@@ -503,6 +506,8 @@
 		75900CF219E4438E00C05D28 /* UIColor */ = {
 			isa = PBXGroup;
 			children = (
+				75D8F39D1B4D023300EBC7E9 /* UIColor+YAColorMixing.h */,
+				75D8F39E1B4D023300EBC7E9 /* UIColor+YAColorMixing.m */,
 				75900CF319E4438E00C05D28 /* UIColor+YAHexColor.h */,
 				75900CF419E4438E00C05D28 /* UIColor+YAHexColor.m */,
 			);
@@ -798,6 +803,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				75900D3819E4438E00C05D28 /* YASeparatorLine.m in Sources */,
+				75D8F39F1B4D023300EBC7E9 /* UIColor+YAColorMixing.m in Sources */,
 				75900D2F19E4438E00C05D28 /* UIBarButtonItem+YAItemFactory.m in Sources */,
 				7543F9D91A2342C0008178C8 /* YATextEditorViewController.m in Sources */,
 				75900D3119E4438E00C05D28 /* UIControl+YAUIKit.m in Sources */,