如何在macOS 10.14上检测暗模式？

Question

在macOS 10.14中,用户可以选择采用系统范围的亮或暗外观,我需要根据当前模式手动调整一些颜色.

Answer 1

由于您经常通过的实际外观对象effectiveAppearance是复合外观,直接询问其名称可能不是一个可靠的解决方案.

询问currentAppearance通常也不是一个好主意,因为视图可以明确设置为亮模式,或者您想知道视图drawRect:在模式切换后可能获得不正确结果的位置之外是亮还是暗.

我想出的解决方案如下:

BOOL appearanceIsDark(NSAppearance * appearance)
{
    if (@available(macOS 10.14, *)) {
        NSAppearanceName basicAppearance = [appearance bestMatchFromAppearancesWithNames:@[
            NSAppearanceNameAqua,
            NSAppearanceNameDarkAqua
        ]];
        return [basicAppearance isEqualToString:NSAppearanceNameDarkAqua];
    } else {
        return NO;
    }
}

您可以使用它,appearanceIsDark(someView.effectiveAppearance)因为如果您明确设置,特定视图的外观可能与另一个视图的外观不同someView.appearance.

您还可以创建一个类别NSAppearance并添加一个- (BOOL)isDark方法来获取someView.effectiveAppearance.isDark(更好地选择Apple将来不太可能使用的名称,例如通过添加供应商前缀).

Answer 2

如果系统是10.14,我已经使用了当前的外观检查

+ (BOOL)isDarkMode {
    NSAppearance *appearance = NSAppearance.currentAppearance;
    if (@available(*, macOS 10.14)) {
        return appearance.name == NSAppearanceNameDarkAqua;
    }

    return NO;
}

并且在视图中检测模式的变化方法是:

- (void)updateLayer;
- (void)drawRect:(NSRect)dirtyRect;
- (void)layout;
- (void)updateConstraints;

并且为了在视图控制器中检测模式的改变,方法是:

- (void)updateViewConstraints;
- (void)viewWillLayout;
- (void)viewDidLayout;

使用通知:

// Monitor menu/dock theme changes...
[NSDistributedNotificationCenter.defaultCenter addObserver:self selector:@selector(themeChanged:) name:@"AppleInterfaceThemeChangedNotification" object: nil];

-(void)themeChanged:(NSNotification *) notification {
    NSLog (@"%@", notification);
}

有关暗模式文档的更多信息

Answer 3

斯威夫特4

func isDarkMode(view: NSView?) -> Bool {
    if #available(OSX 10.14, *) {
        if let appearance = view?.effectiveAppearance ?? NSAppearance.current {
            return (appearance.name == .darkAqua)
        }
    }
    return false
}

更新：

func isDarkMode(view: NSView) -> Bool {
    if #available(OSX 10.14, *) {
        return view.effectiveAppearance.bestMatch(from: [.darkAqua, .aqua]) == .darkAqua
    }
    return false
}