首页 > 代码库 > 将数据保存在系统钥匙串里，即使应用被删除，数据还会被保存
将数据保存在系统钥匙串里，即使应用被删除，数据还会被保存
@interface SaveObject : NSObject
// 保存数据
+ (void)save:(NSString *)key data:(id)data;
// 加载数据
+ (id)load:(NSString *)key;
// 删除数据
+ (void)delete:(NSString *)key;
@end
@implementation SaveObject
// 获取数据
+ (NSMutableDictionary *)keychainQuery:(NSString *)key
{
if (key) {
return [NSMutableDictionary dictionaryWithObjectsAndKeys:
(__bridge_transfer id)kSecClassGenericPassword, (__bridge_transfer id)kSecClass,
key, (__bridge_transfer id)kSecAttrService,
key, (__bridge_transfer id)kSecAttrAccount,
(__bridge_transfer id)kSecAttrAccessibleAfterFirstUnlock, (__bridge_transfer id)kSecAttrAccessible,
nil];
}
return nil;
}
// 保存数据
+ (void)save:(NSString *)key data:(id)data
{
if (key && data != nil) {
//Get search dictionary
NSMutableDictionary *keychainQuery = [self keychainQuery:key];
//Delete old item before add new item
SecItemDelete((__bridge_retained CFDictionaryRef)keychainQuery);
//Add new object to search dictionary(Attention:the data format)
[keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(__bridge_transfer id)kSecValueData];
//Add item to keychain with the search dictionary
SecItemAdd((__bridge_retained CFDictionaryRef)keychainQuery, NULL);
}
}
// 加载数据
+ (id)load:(NSString *)key
{
id ret = nil;
if (key) {
NSMutableDictionary *keychainQuery = [self keychainQuery:key];
//Configure the search setting
[keychainQuery setObject:(id)kCFBooleanTrue forKey:(__bridge_transfer id)kSecReturnData];
[keychainQuery setObject:(__bridge_transfer id)kSecMatchLimitOne forKey:(__bridge_transfer id)kSecMatchLimit];
CFDataRef keyData = http://www.mamicode.com/NULL;
if (SecItemCopyMatching((__bridge_retained CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr) {
@try {
ret = [NSKeyedUnarchiver unarchiveObjectWithData:(__bridge_transfer NSData *)keyData];
}
@catch (NSException *e) {
NSLog(@"Unarchive of %@ failed: %@", key, e);
}
@finally {}
}
}
return ret;
}
// 删除数据
+ (void)delete:(NSString *)key
{
NSMutableDictionary *keychainQuery = [self keychainQuery:key];
SecItemDelete((__bridge_retained CFDictionaryRef)keychainQuery);
}
@end
将数据保存在系统钥匙串里，即使应用被删除，数据还会被保存