从不同的Swift类访问变量

class MyClass {
    var myVariable: String = "Hello, World!"
}

let instance = MyClass()
print(instance.myVariable)  // 输出: Hello, World!

class MyClass {
    static var myStaticVariable: String = "Static Value"
}

print(MyClass.myStaticVariable)  // 输出: Static Value

var globalVariable: String = "Global Value"

class FirstClass {
    func printGlobal() {
        print(globalVariable)
    }
}

class SecondClass {
    func printGlobal() {
        print(globalVariable)
    }
}

FirstClass().printGlobal()  // 输出: Global Value
SecondClass().printGlobal()  // 输出: Global Value

class Singleton {
    static let shared = Singleton()
    var myVariable: String = "Singleton Value"
}

print(Singleton.shared.myVariable)  // 输出: Singleton Value

class MyClass {
    let dependency: DependencyProtocol
    
    init(dependency: DependencyProtocol) {
        self.dependency = dependency
    }
}

protocol DependencyProtocol {
    var value: String { get }
}

class Dependency: DependencyProtocol {
    var value: String = "Injected Value"
}

let dependency = Dependency()
let myClassInstance = MyClass(dependency: dependency)
print(myClassInstance.dependency.value)  // 输出: Injected Value