1.首先导入系统库Security.framework
2.创建文件SFHFKeychainUtils.h如下（复制即可）：
@interface SFHFKeychainUtils : NSObject {
}
+ (NSString *) getPasswordForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error;
+ (BOOL) storeUsername: (NSString *) username andPassword: (NSString *) password forServiceName: (NSString *) serviceName updateExisting: (BOOL) updateExisting error: (NSError **) error;
+ (BOOL) deleteItemForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error;
@end
SFHFKeychainUtils.m如下
#import "SFHFKeychainUtils.h"
#import
static NSString *SFHFKeychainUtilsErrorDomain = @"SFHFKeychainUtilsErrorDomain";
#if __IPHONE_OS_VERSION_MIN_REQUIRED < 30000 && TARGET_IPHONE_SIMULATOR
@interface SFHFKeychainUtils (PrivateMethods)
+ (SecKeychainItemRef) getKeychainItemReferenceForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error;
@end
#endif
@implementation SFHFKeychainUtils
#if __IPHONE_OS_VERSION_MIN_REQUIRED < 30000 && TARGET_IPHONE_SIMULATOR
+ (NSString *) getPasswordForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error {
if (!username || !serviceName) {
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -2000 userInfo: nil];
return nil;
}
SecKeychainItemRef item = [SFHFKeychainUtils getKeychainItemReferenceForUsername: username andServiceName: serviceName error: error];
if (*error || !item) {
return nil;
}
// from Advanced Mac OS X Programming, ch. 16
UInt32 length;
char *password;
SecKeychainAttribute attributes[8];
SecKeychainAttributeList list;
attributes[0].tag = kSecAccountItemAttr;
attributes[1].tag = kSecDescriptionItemAttr;
attributes[2].tag = kSecLabelItemAttr;
attributes[3].tag = kSecModDateItemAttr;
list.count = 4;
list.attr = attributes;
OSStatus status = SecKeychainItemCopyContent(item, NULL, &list, &length, (void **)&password);
if (status != noErr) {
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil];
return nil;
}
NSString *passwordString = nil;
if (password != NULL) {
char passwordBuffer[1024];
if (length > 1023) {
length = 1023;
}
strncpy(passwordBuffer, password, length);
passwordBuffer[length] = ‘\0‘;
passwordString = [NSString stringWithCString:passwordBuffer];
}
SecKeychainItemFreeContent(&list, password);
CFRelease(item);
return passwordString;
}
+ (void) storeUsername: (NSString *) username andPassword: (NSString *) password forServiceName: (NSString *) serviceName updateExisting: (BOOL) updateExisting error: (NSError **) error {
if (!username || !password || !serviceName) {
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -2000 userInfo: nil];
return;
}
OSStatus status = noErr;
SecKeychainItemRef item = [SFHFKeychainUtils getKeychainItemReferenceForUsername: username andServiceName: serviceName error: error];
if (*error && [*error code] != noErr) {
return;
}
*error = nil;
if (item) {
status = SecKeychainItemModifyAttributesAndData(item,
NULL,
strlen([password UTF8String]),
[password UTF8String]);
CFRelease(item);
}
else {
status = SecKeychainAddGenericPassword(NULL,
strlen([serviceName UTF8String]),
[serviceName UTF8String],
strlen([username UTF8String]),
[username UTF8String],
strlen([password UTF8String]),
[password UTF8String],
NULL);
}
if (status != noErr) {
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil];
}
}
+ (void) deleteItemForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error {
if (!username || !serviceName) {
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: 2000 userInfo: nil];
return;
}
*error = nil;
SecKeychainItemRef item = [SFHFKeychainUtils getKeychainItemReferenceForUsername: username andServiceName: serviceName error: error];
if (*error && [*error code] != noErr) {
return;
}
OSStatus status;
if (item) {
status = SecKeychainItemDelete(item);
CFRelease(item);
}
if (status != noErr) {
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil];
}
}
+ (SecKeychainItemRef) getKeychainItemReferenceForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error {
if (!username || !serviceName) {
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -2000 userInfo: nil];
return nil;
}
*error = nil;
SecKeychainItemRef item;
OSStatus status = SecKeychainFindGenericPassword(NULL,
strlen([serviceName UTF8String]),
[serviceName UTF8String],
strlen([username UTF8String]),
[username UTF8String],
NULL,
NULL,
&item);
if (status != noErr) {
if (status != errSecItemNotFound) {
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil];
}
return nil;
}
return item;
}
#else
+ (NSString *) getPasswordForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error {
if (!username || !serviceName) {
if (error != nil) {
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -2000 userInfo: nil];
}
return nil;
}
if (error != nil) {
*error = nil;
}
// Set up a query dictionary with the base query attributes: item type (generic), username, and service
NSArray *keys = [[[NSArray alloc] initWithObjects: (NSString *) kSecClass, kSecAttrAccount,kSecAttrService, nil] autorelease];
NSArray *objects = [[[NSArray alloc] initWithObjects: (NSString *) kSecClassGenericPassword, username, serviceName, nil] autorelease];
NSMutableDictionary *query = [[[NSMutableDictionary alloc] initWithObjects: objects forKeys: keys] autorelease];
// First do a query for attributes, in case we already have a Keychain item with no password data set.
// One likely way such an incorrect item could have come about is due to the previous (incorrect)
// version of this code (which set the password as a generic attribute instead of password data).
NSDictionary *attributeResult = NULL;
NSMutableDictionary *attributeQuery = [query mutableCopy];
[attributeQuery setObject: (id) kCFBooleanTrue forKey:(id) kSecReturnAttributes];
OSStatus status = SecItemCopyMatching((CFDictionaryRef) attributeQuery, (CFTypeRef *) &attributeResult);
[attributeResult release];
[attributeQuery release];
if (status != noErr) {
// No existing item found--simply return nil for the password
if (error != nil && status != errSecItemNotFound) {
//Only return an error if a real exception happened--not simply for "not found."
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil];
}
return nil;
}
// We have an existing item, now query for the password data associated with it.
NSData *resultData = nil;
NSMutableDictionary *passwordQuery = [query mutableCopy];
[passwordQuery setObject: (id) kCFBooleanTrue forKey: (id) kSecReturnData];
status = SecItemCopyMatching((CFDictionaryRef) passwordQuery, (CFTypeRef *) &resultData);
[resultData autorelease];
[passwordQuery release];
if (status != noErr) {
if (status == errSecItemNotFound) {
// We found attributes for the item previously, but no password now, so return a special error.
// Users of this API will probably want to detect this error and prompt the user to
// re-enter their credentials. When you attempt to store the re-entered credentials
// using storeUsername:andPassword:forServiceName:updateExisting:error
// the old, incorrect entry will be deleted and a new one with a properly encrypted
// password will be added.
if (error != nil) {
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -1999 userInfo:nil];
}
}
else {
// Something else went wrong. Simply return the normal Keychain API error code.
if (error != nil) {
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo:nil];
}
}
return nil;
}
NSString *password = nil;
if (resultData) {
password = [[NSString alloc] initWithData: resultData encoding: NSUTF8StringEncoding];
}
else {
// There is an existing item, but we weren‘t able to get password data for it for some reason,
// Possibly as a result of an item being incorrectly entered by the previous code.
// Set the -1999 error so the code above us can prompt the user again.
if (error != nil) {
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -1999 userInfo: nil];
}
}
return [password autorelease];
}
+ (BOOL) storeUsername: (NSString *) username andPassword: (NSString *) password forServiceName: (NSString *) serviceName updateExisting: (BOOL) updateExisting error: (NSError **) error
{
if (!username || !password || !serviceName)
{
if (error != nil)
{
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -2000 userInfo: nil];
}
return NO;
}
// See if we already have a password entered for these credentials.
NSError *getError = nil;
NSString *existingPassword = [SFHFKeychainUtils getPasswordForUsername: username andServiceName: serviceName error:&getError];
if ([getError code] == -1999)
{
// There is an existing entry without a password properly stored (possibly as a result of the previous incorrect version of this code.
// Delete the existing item before moving on entering a correct one.
getError = nil;
[self deleteItemForUsername: username andServiceName: serviceName error: &getError];
if ([getError code] != noErr)
{
if (error != nil)
{
*error = getError;
}
return NO;
}
}
else if ([getError code] != noErr)
{
if (error != nil)
{
*error = getError;
}
return NO;
}
if (error != nil)
{
*error = nil;
}
OSStatus status = noErr;
if (existingPassword)
{
// We have an existing, properly entered item with a password.
// Update the existing item.
if (![existingPassword isEqualToString:password] && updateExisting)
{
//Only update if we‘re allowed to update existing. If not, simply do nothing.
NSArray *keys = [[[NSArray alloc] initWithObjects: (NSString *) kSecClass,
kSecAttrService,
kSecAttrLabel,
kSecAttrAccount,
nil] autorelease];
NSArray *objects = [[[NSArray alloc] initWithObjects: (NSString *) kSecClassGenericPassword,
serviceName,
serviceName,
username,
nil] autorelease];
NSDictionary *query = [[[NSDictionary alloc] initWithObjects: objects forKeys: keys] autorelease];
status = SecItemUpdate((CFDictionaryRef) query, (CFDictionaryRef) [NSDictionarydictionaryWithObject: [password dataUsingEncoding: NSUTF8StringEncoding] forKey: (NSString *)kSecValueData]);
}
}
else
{
// No existing entry (or an existing, improperly entered, and therefore now
// deleted, entry). Create a new entry.
NSArray *keys = [[[NSArray alloc] initWithObjects: (NSString *) kSecClass,
kSecAttrService,
kSecAttrLabel,
kSecAttrAccount,
kSecValueData,
nil] autorelease];
NSArray *objects = [[[NSArray alloc] initWithObjects: (NSString *) kSecClassGenericPassword,
serviceName,
serviceName,
username,
[password dataUsingEncoding: NSUTF8StringEncoding],
nil] autorelease];
NSDictionary *query = [[[NSDictionary alloc] initWithObjects: objects forKeys: keys] autorelease];
status = SecItemAdd((CFDictionaryRef) query, NULL);
}
if (status != noErr)
{
// Something went wrong with adding the new item. Return the Keychain error code.
if (error != nil) {
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil];
}
return NO;
}
return YES;
}
+ (BOOL) deleteItemForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error
{
if (!username || !serviceName)
{
if (error != nil)
{
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -2000 userInfo: nil];
}
return NO;
}
if (error != nil)
{
*error = nil;
}
NSArray *keys = [[[NSArray alloc] initWithObjects: (NSString *) kSecClass, kSecAttrAccount,kSecAttrService, kSecReturnAttributes, nil] autorelease];
NSArray *objects = [[[NSArray alloc] initWithObjects: (NSString *) kSecClassGenericPassword, username, serviceName, kCFBooleanTrue, nil] autorelease];
NSDictionary *query = [[[NSDictionary alloc] initWithObjects: objects forKeys: keys] autorelease];
OSStatus status = SecItemDelete((CFDictionaryRef) query);
if (status != noErr)
{
if (error != nil) {
*error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil];
}
return NO;
}
return YES;
}
#endif
@end
这里才是重要的代码
3.在获取uuid类里导入头文件#import"SFHFKeychainUtils.h"
下面是获取方法每次调用此方法即可
+(NSString*) GetIOSUUID
{
NSError *error;
NSString * string = [SFHFKeychainUtils getPasswordForUsername:@"UUID" andServiceName:@"com.china.TestKeyChain" error:&error];
if (!string) {
}
if(error || !string){
NSLog(@"?从Keychain里获取密码出错：%@", error);
[self saveUUID];//保存
string = [SFHFKeychainUtils getPasswordForUsername:@"UUID" andServiceName:@"com.china.TestKeyChain" error:&error];
}
else{
NSLog(@"?从Keychain里获取密码成功！密码为%@",string);
}
return string;
}
保存uuid方法（此方法不必自己调用）
+(void)saveUUID
{
CFUUIDRef puuid = CFUUIDCreate( nil );
CFStringRef uuidString = CFUUIDCreateString( nil, puuid );
NSString * result = (NSString *)CFBridgingRelease(CFStringCreateCopy( NULL, uuidString));
CFRelease(puuid);
CFRelease(uuidString);
NSError *error;
BOOL saved = [SFHFKeychainUtils storeUsername:@"UUID" andPassword:result
forServiceName:@"com.china.TestKeyChain" updateExisting:YESerror:&error];
if (!saved) {
NSLog(@"?Keychain保存密码时出错：%@", error);
}else{
NSLog(@"?Keychain保存密码成功！%@",result);
}
}
4.最后就要测试了，运行时打印一下uuid，然后卸载了重新运行打印，发现一样就OK了
原文 http://blog.sina.com.cn/s/blog_15383d4e60102w5fv.html 谢谢分享