objective-c和swift中不同的格式掩码

typedef NS_OPTIONS(NSUInteger, MyFormatOptions) {
    MyFormatOptionNone      = 0,
    MyFormatOptionBold      = 1 << 0,
    MyFormatOptionItalic    = 1 << 1,
    MyFormatOptionUnderline = 1 << 2
};

- (void)applyFormatWithOptions:(MyFormatOptions)options {
    if (options & MyFormatOptionBold) {
        // 应用粗体样式
    }
    if (options & MyFormatOptionItalic) {
        // 应用斜体样式
    }
    if (options & MyFormatOptionUnderline) {
        // 应用下划线样式
    }
}

// 使用格式掩码
[self applyFormatWithOptions:MyFormatOptionBold | MyFormatOptionUnderline];

struct MyFormatOptions: OptionSet {
    let rawValue: Int

    static let none      = MyFormatOptions(rawValue: 0)
    static let bold      = MyFormatOptions(rawValue: 1 << 0)
    static let italic    = MyFormatOptions(rawValue: 1 << 1)
    static let underline = MyFormatOptions(rawValue: 1 << 2)
}

func applyFormat(with options: MyFormatOptions) {
    if options.contains(.bold) {
        // 应用粗体样式
    }
    if options.contains(.italic) {
        // 应用斜体样式
    }
    if options.contains(.underline) {
        // 应用下划线样式
    }
}

// 使用格式掩码
applyFormat(with: [.bold, .underline])