安全存储的限制是指在存储敏感信息（例如密码、API密钥等）时需要采取一些安全措施，以防止信息泄露和未经授权的访问。

钥匙链（Keychain）和密钥库（Keystore）是两个常用的安全存储解决方案。下面是一些包含代码示例的解决方法：

1. 钥匙链（Keychain）：

使用钥匙链来存储和获取敏感信息（如密码）的示例代码：

import Security

// 存储密码到钥匙链
func savePasswordToKeychain(password: String, account: String) {
    let query: [String: Any] = [
        kSecClass as String: kSecClassGenericPassword,
        kSecAttrAccount as String: account,
        kSecValueData as String: password.data(using: .utf8)!,
        kSecAttrAccessible as String: kSecAttrAccessibleWhenUnlocked
    ]
    
    let status = SecItemAdd(query as CFDictionary, nil)
    if status != errSecSuccess {
        // 存储失败处理
    }
}

// 从钥匙链获取密码
func getPasswordFromKeychain(account: String) -> String? {
    let query: [String: Any] = [
        kSecClass as String: kSecClassGenericPassword,
        kSecAttrAccount as String: account,
        kSecReturnData as String: kCFBooleanTrue!,
        kSecMatchLimit as String: kSecMatchLimitOne
    ]
    
    var result: AnyObject?
    let status = SecItemCopyMatching(query as CFDictionary, &result)
    
    if status == errSecSuccess {
        if let passwordData = result as? Data, let password = String(data: passwordData, encoding: .utf8) {
            return password
        }
    }
    
    return nil
}

2. 密钥库（Keystore）：

使用密钥库来存储和获取敏感信息（如API密钥）的示例代码：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.security.KeyStore;
import java.security.KeyStore.PasswordProtection;
import java.security.KeyStore.SecretKeyEntry;

// 存储API密钥到密钥库
public void saveApiKeyToKeystore(String apiKey, String alias, String password) {
    try {
        KeyStore keyStore = KeyStore.getInstance("JCEKS");
        File keystoreFile = new File("keystore.jks");
        
        if (!keystoreFile.exists()) {
            keyStore.load(null, password.toCharArray());
        } else {
            FileInputStream fis = new FileInputStream(keystoreFile);
            keyStore.load(fis, password.toCharArray());
            fis.close();
        }
        
        KeyStore.SecretKeyEntry secretKeyEntry = new KeyStore.SecretKeyEntry(apiKey.toCharArray());
        PasswordProtection passwordProtection = new PasswordProtection(password.toCharArray());
        keyStore.setEntry(alias, secretKeyEntry, passwordProtection);
        
        FileOutputStream fos = new FileOutputStream(keystoreFile);
        keyStore.store(fos, password.toCharArray());
        fos.close();
    } catch (Exception e) {
        // 存储失败处理
    }
}

// 从密钥库获取API密钥
public String getApiKeyFromKeystore(String alias, String password) {
    try {
        KeyStore keyStore = KeyStore.getInstance("JCEKS");
        FileInputStream fis = new FileInputStream("keystore.jks");
        keyStore.load(fis, password.toCharArray());
        fis.close();
        
        KeyStore.ProtectionParameter protectionParameter = new PasswordProtection(password.toCharArray());
        KeyStore.SecretKeyEntry secretKeyEntry = (SecretKeyEntry) keyStore.getEntry(alias, protectionParameter);
        
        return new String(secretKeyEntry.getSecretKey().getEncoded());
    } catch (Exception e) {
        // 获取失败处理
    }
    
    return null;
}

以上代码示例分别展示了在钥匙链和密钥库中存储和获取敏感信息的方法。请根据所使用的编程语言和具体需求进行适当的修改和调整。