图片资源适配

apple给我提供了图片资源的适配

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我可以在不通的模式下，系统自动选择不同的图片资源

颜色适配

1.系统提供的颜色方法

@interface UIColor (UIColorSystemColors)

#pragma mark System colors

/* Some colors that are used by system elements and applications.
 * These return named colors whose values may vary between different contexts and releases.
 * Do not make assumptions about the color spaces or actual colors used.
 */
@property (class, nonatomic, readonly) UIColor *systemRedColor          API_AVAILABLE(ios(7.0), tvos(9.0)) API_UNAVAILABLE(watchOS);
@property (class, nonatomic, readonly) UIColor *systemGreenColor        API_AVAILABLE(ios(7.0), tvos(9.0)) API_UNAVAILABLE(watchOS);
@property (class, nonatomic, readonly) UIColor *systemBlueColor         API_AVAILABLE(ios(7.0), tvos(9.0)) API_UNAVAILABLE(watchOS);
@property (class, nonatomic, readonly) UIColor *systemOrangeColor       API_AVAILABLE(ios(7.0), tvos(9.0)) API_UNAVAILABLE(watchOS);
@property (class, nonatomic, readonly) UIColor *systemYellowColor       API_AVAILABLE(ios(7.0), tvos(9.0)) API_UNAVAILABLE(watchOS);
@property (class, nonatomic, readonly) UIColor *systemPinkColor         API_AVAILABLE(ios(7.0), tvos(9.0)) API_UNAVAILABLE(watchOS);
@property (class, nonatomic, readonly) UIColor *systemPurpleColor       API_AVAILABLE(ios(9.0), tvos(9.0)) API_UNAVAILABLE(watchOS);
@property (class, nonatomic, readonly) UIColor *systemTealColor         API_AVAILABLE(ios(7.0), tvos(9.0)) API_UNAVAILABLE(watchOS);
@property (class, nonatomic, readonly) UIColor *systemIndigoColor       API_AVAILABLE(ios(13.0), tvos(13.0)) API_UNAVAILABLE(watchOS);

/* Shades of gray. systemGray is the base gray color.
 */
@property (class, nonatomic, readonly) UIColor *systemGrayColor         API_AVAILABLE(ios(7.0), tvos(9.0))

2.自定义颜色

    UIColor *backgroundColor = [UIColor colorWithDynamicProvider:^UIColor * _Nonnull(UITraitCollection * _Nonnull traitCollection) {
        if (traitCollection.userInterfaceStyle == UIUserInterfaceStyleDark) {
            return [UIColor redColor];;
        } else {
            return [UIColor whiteColor];

        }
    }];

模式配置

关闭黑暗模式

1.在Info.plist 文件中，添加 key 为 User Interface Style 类型String。
2.将UIUserInterfaceStyle key 的值设置为 Light

单页面关闭黑暗模式

在ios13系统下UIViewcontroller与UIView有一个新的属性 overrideUserInterfaceStyle 可以强制设置关闭暗黑模式的属性

typedef NS_ENUM(NSInteger, UIUserInterfaceStyle) {
    UIUserInterfaceStyleUnspecified,
    UIUserInterfaceStyleLight,
    UIUserInterfaceStyleDark,
}

调试切换黑暗模式

storyboard中设置

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菜单栏设置

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