Generate a color's complementary color

iOSPalette/PaletteDemo/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -84,6 +84,11 @@
       "idiom" : "ipad",
       "size" : "83.5x83.5",
       "scale" : "2x"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "size" : "1024x1024",
+      "scale" : "1x"
     }
   ],
   "info" : {

iOSPalette/PaletteDemo/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

iOSPalette/PaletteDemo/ThirdLib/DemoShowColorSingleView.m

@@ -9,6 +9,7 @@
 #import "DemoShowColorSingleView.h"
 #import "UIView+Geometry.h"
 #import "UIColor+Hex.h"
+#import "UIColor+Complementary.h"
 
 @interface DemoShowColorViewCell ()
 
@@ -61,6 +62,9 @@ - (void)configureData:(PaletteColorModel*)model andKey:(NSString *)modeKey{
     _showPercentageLabel.text = percentageText;
     [_showPercentageLabel sizeToFit];
     _showPercentageLabel.origin = CGPointMake((self.width - _showPercentageLabel.width)/2, _showColorLabel.bottom + 5.0f);
+
+    _showColorLabel.textColor = _showPercentageLabel.textColor = [self.backgroundColor blackWhiteComplementaryColor];
+
 }
 
 @end

iOSPalette/PaletteDemo/ThirdLib/UIButton+BlackWhiteImage.h

@@ -0,0 +1,30 @@
+//
+//  UIButton+BlackWhiteImage.h
+//  PaletteDemo
+//
+//  Created by yhy on 2018/11/8.
+//  Copyright © 2018年 kmyhy. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface UIButton (BlackWhiteImage)
+
+// 根据一张背景图片生成一张对比强烈的黑白色图片作为 button 的 image
+-(void)setBlackWhiteImageWithImage:(UIImage*)image backgroundImage:(UIImage*)bgImage;
+/**
+ 根据背景 view 中的某个区域设置 button 的 image(白或黑）
+ @image     button 的 image
+ @bgView    button 的背景 view
+ @rect      button 在背景 view 上所占据的区域
+ **/
+-(void)setBlackWhiteImageWithImage:(UIImage*)image backgroundView:(UIView*)bgView withRect:(CGRect)rect;
+/**
+ 上一方法的简化版，最后一个参数自动计算。假设 button 和 backgroundView 是同一个 parent view。
+ */
+-(void)setBlackWhiteImageWithImage:(UIImage*)image backgroundView:(UIView*)bgView;
+@end
+
+NS_ASSUME_NONNULL_END

iOSPalette/PaletteDemo/ThirdLib/UIButton+BlackWhiteImage.m

@@ -0,0 +1,35 @@
+//
+//  UIButton+BlackWhiteImage.m
+//  PaletteDemo
+//
+//  Created by yhy on 2018/11/8.
+//  Copyright © 2018年 kmyhy. All rights reserved.
+//
+
+#import "UIButton+BlackWhiteImage.h"
+#import "UIImage+Palette.h"
+#import "UIColor+Complementary.h"
+#import "UIColor+Hex.h"
+#import "UIImage+Extension.h"
+#import "UIView+snapshot.h"
+
+@implementation UIButton (BlackWhiteImage)
+-(void)setBlackWhiteImageWithImage:(UIImage*)image backgroundImage:(UIImage*)bgImage{
+    [bgImage getPaletteImageColor:^(PaletteColorModel *recommendColor, NSDictionary *allModeColorDic, NSError *error) {
+        UIColor* color = [UIColor colorWithHexString:recommendColor.imageColorString];
+        UIColor* complementaryColor = [color blackWhiteComplementaryColor];
+        UIImage* colorImage = [image colorImage:complementaryColor];
+        [self setImage:colorImage forState:UIControlStateNormal];
+    }];
+}
+-(void)setBlackWhiteImageWithImage:(UIImage*)image backgroundView:(UIView*)bgView withRect:(CGRect)rect{
+    UIImage* snapshot = [bgView snapshot];
+    snapshot = [snapshot cutWithRect:rect];
+    [self setBlackWhiteImageWithImage:image backgroundImage:snapshot];
+}
+
+-(void)setBlackWhiteImageWithImage:(UIImage*)image backgroundView:(UIView*)bgView{
+    CGRect r = [self convertRect:self.bounds toView:bgView];
+    [self setBlackWhiteImageWithImage:image backgroundView:bgView withRect:r];
+}
+@end

iOSPalette/PaletteDemo/ThirdLib/UIColor+Complementary.h

@@ -0,0 +1,20 @@
+//
+//  UIColor+Complementary.h
+//  
+//
+//  Created by kmyhy on 2018/11/7.
+//  Copyright © 2018年 kmyhy. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface UIColor (Complementary)
+// MARK: 计算互补色
+-(UIColor*)complementaryColor;
+// MARK: 黑白互补色
+-(UIColor*)blackWhiteComplementaryColor;
+@end
+
+NS_ASSUME_NONNULL_END

iOSPalette/PaletteDemo/ThirdLib/UIColor+Complementary.m

@@ -0,0 +1,40 @@
+//
+//  UIColor+Complementary.m
+//  
+//
+//  Created by kmyhy on 2018/11/7.
+//  Copyright © 2018年 kmyhy. All rights reserved.
+//
+
+#import "UIColor+Complementary.h"
+
+@implementation UIColor (Complementary)
+-(UIColor*)complementaryColor{
+    CGFloat red = 0.0, green = 0.0, blue = 0.0, alpha = 0.0;
+    [self getRed:&red green:&green blue:&blue alpha:&alpha];
+
+    //Check if color is transparent
+    if (alpha == 0) {
+        return [UIColor clearColor];
+    }else{
+        return [UIColor colorWithRed:(1-red) green:(1-green) blue:(1-blue) alpha:alpha];
+    }
+}
+-(UIColor*)blackWhiteComplementaryColor{
+    CGFloat red = 0.0, green = 0.0, blue = 0.0, alpha = 0.0;
+    [self getRed:&red green:&green blue:&blue alpha:&alpha];
+
+    //Check if color is transparent
+    if (alpha == 0) {
+        return [UIColor clearColor];
+    }else{
+        // 计算亮度
+        red *= 0.2126f; green *= 0.7152f; blue *= 0.0722f;
+        CGFloat luminance = red + green + blue;
+
+        UIColor * black = [UIColor colorWithWhite:0 alpha:alpha];
+        UIColor * white = [UIColor colorWithWhite:1 alpha:alpha];
+        return (luminance > 0.6f)?black:white;
+    }
+}
+@end

iOSPalette/PaletteDemo/ThirdLib/UIImage+Extension.h

@@ -0,0 +1,31 @@
+//
+//  UIImage-Extensions.h
+//
+//  Created by Hardy Macia on 7/1/09.
+//  Copyright 2009 Catamount Software. All rights reserved.
+//
+#import <Foundation/Foundation.h>
+#import <UIKit/UIKit.h>
+
+@interface UIImage (CS_Extensions)
+- (UIImage *)imageAtRect:(CGRect)rect;
+- (UIImage *)imageByScalingProportionallyToMinimumSize:(CGSize)targetSize;
+- (UIImage *)imageByScalingProportionallyToSize:(CGSize)targetSize;
+- (UIImage *)imageByScalingToSize:(CGSize)targetSize;
+- (UIImage *)imageRotatedByRadians:(CGFloat)radians;
+- (UIImage *)imageRotatedByDegrees:(CGFloat)degrees;
+- (UIImage*) grayishImage;
+- (UIImage*)scaleToSize:(CGSize)size;
+- (UIImage*)scaleToSizeKeepAspect:(CGSize)size;
+- (UIImage *)scaledToScale:(CGFloat)scale;
+- (UIImage *)colorImage:(UIColor *)color;
+-(UIImage*)transparentRetainRGBColor:(UIColor*)color;
+- (UIImage*)reverseColorImage:(UIColor*)color;
++ (UIImage *)imageWithErweima:(NSString*)erweima size:(CGSize)size;
+// 如果图片超过指定大小，则压缩到指定大小，否则不压缩
+-(UIImage*)scaleToMaxSizeKeepAspect:(CGSize)size;
+// MARK: 按照矩形裁剪图片
+- (UIImage *)cutWithRect:(CGRect )rect;
+// MARK: 获取图片大小
+-(CGSize)getImageSize;
+@end;