macOS 获取系统设置外观获取系统深色模式皮肤

#import "ViewController.h"

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    //控件布局
    [self layoutSubViews];
    //  判断的方式
    NSDictionary *dict = [[NSUserDefaults standardUserDefaults] persistentDomainForName:NSGlobalDomain];
    id style = [dict objectForKey:@"AppleInterfaceStyle"];
    BOOL isDarkMode = ( style && [style isKindOfClass:[NSString class]] && NSOrderedSame == [style caseInsensitiveCompare:@"dark"] );
    if (isDarkMode) {
        NSLog(@"777黑夜模式");
    } else {
        NSLog(@"777正常模式");
    }
}

还有动态监测

#import "ViewController.h"

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    //控件布局
    [self layoutSubViews];
    // 动态监听 Mode 的修改
    NSString * const darkModeNotificationName = @"AppleInterfaceThemeChangedNotification";
    [[NSDistributedNotificationCenter defaultCenter] addObserver:self selector:@selector(updateDarkMode) name:darkModeNotificationName object:nil];
}

// 监听的修改方法
- (void)updateDarkMode {
      NSDictionary *dict = [[NSUserDefaults standardUserDefaults] persistentDomainForName:NSGlobalDomain];
    id style = [dict objectForKey:@"AppleInterfaceStyle"];
    BOOL isDarkMode = ( style && [style isKindOfClass:[NSString class]] && NSOrderedSame == [style caseInsensitiveCompare:@"dark"] );
    if (isDarkMode) {
        NSLog(@"77777黑夜模式");
    } else {
        NSLog(@"77777正常模式");
    }
}