以编程方式（从我的应用内）获取存储在钥匙串中的所有项目的最简单方法是什么？
它可能与 SecItemCopyMatching（） 有关，但该函数的文档不是很清楚（我未能在网上找到一个像样的样本）。
SecItemCopyMatching是正确的选择。首先，我们构建查询字典，以便在字典中返回项目的属性，并返回所有项目：
NSMutableDictionary *query = [NSMutableDictionary dictionaryWithObjectsAndKeys:
(__bridge id)kCFBooleanTrue, (__bridge id)kSecReturnAttributes,
(__bridge id)kSecMatchLimitAll, (__bridge id)kSecMatchLimit,
nil];
由于SecItemCopyMatching至少需要返回的 SecItem s 的类，因此我们创建一个包含所有类的数组......
NSArray *secItemClasses = [NSArray arrayWithObjects:
(__bridge id)kSecClassGenericPassword,
(__bridge id)kSecClassInternetPassword,
(__bridge id)kSecClassCertificate,
(__bridge id)kSecClassKey,
(__bridge id)kSecClassIdentity,
nil];
。对于每个类，在我们的查询中设置类，调用 SecItemCopyMatching ，并记录结果。
for (id secItemClass in secItemClasses) {
[query setObject:secItemClass forKey:(__bridge id)kSecClass];
CFTypeRef result = NULL;
SecItemCopyMatching((__bridge CFDictionaryRef)query, &result);
NSLog(@"%@", (__bridge id)result);
if (result != NULL) CFRelease(result);
}
在生产代码中，应检查 SecItemCopyMatching 返回的OSStatus是errSecItemNotFound（未找到项）还是errSecSuccess（至少找到一项）。
Swift
4 对 @Cosmin 的 Swift 3 答案的更新。
open func getAllKeyChainItemsOfClass(_ secClass: String) -> [String:String] {
let query: [String: Any] = [
kSecClass as String : secClass,
kSecReturnData as String : kCFBooleanTrue,
kSecReturnAttributes as String : kCFBooleanTrue,
kSecReturnRef as String : kCFBooleanTrue,
kSecMatchLimit as String: kSecMatchLimitAll
]
var result: AnyObject?
let lastResultCode = withUnsafeMutablePointer(to: &result) {
SecItemCopyMatching(query as CFDictionary, UnsafeMutablePointer($0))
}
var values = [String:String]()
if lastResultCode == noErr {
let array = result as? Array<Dictionary<String, Any>>
for item in array! {
if let key = item[kSecAttrAccount as String] as? String,
let value = item[kSecValueData as String] as? Data {
values[key] = String(data: value, encoding:.utf8)
}
}
}
return values
}
Swift 3+ 版本，也返回密钥 （kSecAttrAccount）：
open func getAllKeyChainItemsOfClass(_ secClass: String) -> [String:String] {
let query: [String: Any] = [
kSecClass : secClass,
kSecReturnData : kCFBooleanTrue,
kSecReturnAttributes : kCFBooleanTrue,
kSecReturnRef : kCFBooleanTrue,
kSecMatchLimit : kSecMatchLimitAll
]
var result: AnyObject?
let lastResultCode = withUnsafeMutablePointer(to: &result) {
SecItemCopyMatching(query as CFDictionary, UnsafeMutablePointer($0))
}
var values = [String:String]()
if lastResultCode == noErr {
let array = result as? Array<Dictionary<String, Any>>
for item in array! {
if let key = item[kSecAttrAccount] as? String,
let value = item[kSecValueData] as? Data {
values[key] = String(data: value, encoding:.utf8)
}
}
}
return values
}
其他 Swift 代码片段似乎都有点复杂。你真的不必那么多地搞乱可变指针，你可能想要有适当的错误管理。我在 Swift 中实现了我的版本，只是通过调整 Apple 文档中的代码。这是为那些使用Xcode 11的人准备的。
let query: [String: Any] = [kSecClass as String: kSecClassInternetPassword, // change the kSecClass for your needs
kSecMatchLimit as String: kSecMatchLimitAll,
kSecReturnAttributes as String: true,
kSecReturnRef as String: true]
var items_ref: CFTypeRef?
let status = SecItemCopyMatching(query as CFDictionary, &items_ref)
guard status != errSecItemNotFound else { throw KeychainError.noPassword }
guard status == errSecSuccess else { throw KeychainError.unhandledError(status: status) }
let items = items_ref as! Array<Dictionary<String, Any>>
// Now loop over the items and do something with each item
for item in items {
// Sample code: prints the account name
print(item[kSecAttrAccount as String] as? String)
}
带有 xcode 9.1 的 Swift 3 版本
func getAllKeyChainItemsOfClass(_ secClass: String) -> [String:String] {
let query: [String: Any] = [
kSecClass as String : secClass,
kSecReturnData as String : kCFBooleanTrue,
kSecReturnAttributes as String : kCFBooleanTrue,
kSecReturnRef as String : kCFBooleanTrue,
kSecMatchLimit as String : kSecMatchLimitAll
]
var result: AnyObject?
let lastResultCode = withUnsafeMutablePointer(to: &result) {
SecItemCopyMatching(query as CFDictionary, UnsafeMutablePointer($0))
}
var values = [String:String]()
if lastResultCode == noErr {
let array = result as? Array<Dictionary<String, Any>>
for item in array! {
if let key = item[kSecAttrAccount as String] as? String,
let value = item[kSecValueData as String] as? Data {
values[key] = String(data: value, encoding:.utf8)
}
}
}
return values
}
可以这样称呼：
debugPrint(getAllKeyChainItemsOfClass(kSecClassGenericPassword as String))
更新以在字典中包含 kSecClassIdentity 和 kSecClassCertificate 信息
我也不认为使用UnsafeMutablePointer（to：_：）调用是必要的。
func getAllKeyChainItemsOfClass(_ secClass: String) -> [String:AnyObject] {
let query: [String: Any] = [
kSecClass as String : secClass,
kSecReturnData as String : true,
kSecReturnAttributes as String : true,
kSecReturnRef as String : true,
kSecMatchLimit as String: kSecMatchLimitAll
]
var result: AnyObject?
let lastResultCode = withUnsafeMutablePointer(to: &result) {
SecItemCopyMatching(query as CFDictionary, UnsafeMutablePointer($0))
}
// this also works, although I am not sure if it is as save as calling withUnsafeMutabePointer
// let lastResultCode = SecItemCopyMatching(query as CFDictionary, &result)
var values = [String: AnyObject]()
if lastResultCode == noErr {
let array = result as? Array<Dictionary<String, Any>>
for item in array! {
if let key = item[kSecAttrAccount as String] as? String,
let value = item[kSecValueData as String] as? Data {
values[key] = String(data: value, encoding:.utf8) as AnyObject?
}
// including identities and certificates in dictionary
else if let key = item[kSecAttrLabel as String] as? String,
let value = item[kSecValueRef as String] {
values[key] = value as AnyObject
}
}
}
return values
}