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Tweaks/FLEX/Utility/FLEXColor.m

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+//
+//  FLEXColor.m
+//  FLEX
+//
+//  Created by Benny Wong on 6/18/19.
+//  Copyright © 2020 FLEX Team. All rights reserved.
+//
+
+#import "FLEXColor.h"
+#import "FLEXUtility.h"
+
+#define FLEXDynamicColor(dynamic, static) ({ \
+    UIColor *c; \
+    if (@available(iOS 13.0, *)) { \
+        c = [UIColor dynamic]; \
+    } else { \
+        c = [UIColor static]; \
+    } \
+    c; \
+});
+
+@implementation FLEXColor
+
+#pragma mark - Background Colors
+
++ (UIColor *)primaryBackgroundColor {
+    return FLEXDynamicColor(systemBackgroundColor, whiteColor);
+}
+
++ (UIColor *)primaryBackgroundColorWithAlpha:(CGFloat)alpha {
+    return [[self primaryBackgroundColor] colorWithAlphaComponent:alpha];
+}
+
++ (UIColor *)secondaryBackgroundColor {
+    return FLEXDynamicColor(
+        secondarySystemBackgroundColor,
+        colorWithHue:2.0/3.0 saturation:0.02 brightness:0.97 alpha:1
+    );
+}
+
++ (UIColor *)secondaryBackgroundColorWithAlpha:(CGFloat)alpha {
+    return [[self secondaryBackgroundColor] colorWithAlphaComponent:alpha];
+}
+
++ (UIColor *)tertiaryBackgroundColor {
+    // All the background/fill colors are varying shades
+    // of white and black with really low alpha levels.
+    // We use systemGray4Color instead to avoid alpha issues.
+    return FLEXDynamicColor(systemGray4Color, lightGrayColor);
+}
+
++ (UIColor *)tertiaryBackgroundColorWithAlpha:(CGFloat)alpha {
+    return [[self tertiaryBackgroundColor] colorWithAlphaComponent:alpha];
+}
+
++ (UIColor *)groupedBackgroundColor {
+    return FLEXDynamicColor(
+        systemGroupedBackgroundColor,
+        colorWithHue:2.0/3.0 saturation:0.02 brightness:0.97 alpha:1
+    );
+}
+
++ (UIColor *)groupedBackgroundColorWithAlpha:(CGFloat)alpha {
+    return [[self groupedBackgroundColor] colorWithAlphaComponent:alpha];
+}
+
++ (UIColor *)secondaryGroupedBackgroundColor {
+    return FLEXDynamicColor(secondarySystemGroupedBackgroundColor, whiteColor);
+}
+
++ (UIColor *)secondaryGroupedBackgroundColorWithAlpha:(CGFloat)alpha {
+    return [[self secondaryGroupedBackgroundColor] colorWithAlphaComponent:alpha];
+}
+
+#pragma mark - Text colors
+
++ (UIColor *)primaryTextColor {
+    return FLEXDynamicColor(labelColor, blackColor);
+}
+
++ (UIColor *)deemphasizedTextColor {
+    return FLEXDynamicColor(secondaryLabelColor, lightGrayColor);
+}
+
+#pragma mark - UI Element Colors
+
++ (UIColor *)tintColor {
+    #if FLEX_AT_LEAST_IOS13_SDK
+    if (@available(iOS 13.0, *)) {
+        return UIColor.systemBlueColor;
+    } else {
+        return UIApplication.sharedApplication.keyWindow.tintColor;
+    }
+    #else
+    return UIApplication.sharedApplication.keyWindow.tintColor;
+    #endif
+}
+
++ (UIColor *)scrollViewBackgroundColor {
+    return FLEXDynamicColor(
+        systemGroupedBackgroundColor,
+        colorWithHue:2.0/3.0 saturation:0.02 brightness:0.95 alpha:1
+    );
+}
+
++ (UIColor *)iconColor {
+    return FLEXDynamicColor(labelColor, blackColor);
+}
+
++ (UIColor *)borderColor {
+    return [self primaryBackgroundColor];
+}
+
++ (UIColor *)toolbarItemHighlightedColor {
+    return FLEXDynamicColor(
+        quaternaryLabelColor,
+        colorWithHue:2.0/3.0 saturation:0.1 brightness:0.25 alpha:0.6
+    );
+}
+
++ (UIColor *)toolbarItemSelectedColor {
+    return FLEXDynamicColor(
+        secondaryLabelColor,
+        colorWithHue:2.0/3.0 saturation:0.1 brightness:0.25 alpha:0.68
+    );
+}
+
++ (UIColor *)hairlineColor {
+    return FLEXDynamicColor(systemGray3Color, colorWithWhite:0.75 alpha:1);
+}
+
++ (UIColor *)destructiveColor {
+    return FLEXDynamicColor(systemRedColor, redColor);
+}
+
+@end