本地持久化用户名和密码。
KeyChain
为什么不用NSUserDefault来保存用户名和密码呢？因为NSUserDefault可以在资料沙盒中找到。
对应的沙盒路径：
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| Library -> Preferences -> bundleId.plist
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只要找到这个文件，储存在里面的信息便被盗取。
另外，存在KeyChain里的信息是不会随APP被删除而删除的，还可以支持iCloud同步。
api
用到的api有以下4个：
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| SecItemAdd(CFDictionaryRef _Nonnull attributes, CFTypeRef _Nullable * _Nullable result)
SecItemUpdate(CFDictionaryRef _Nonnull query, CFDictionaryRef _Nonnull attributesToUpdate)
SecItemCopyMatching(CFDictionaryRef _Nonnull query, CFTypeRef _Nullable * _Nullable result)
SecItemDelete(CFDictionaryRef _Nonnull query)
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查询：
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| NSMutableDictionary *query = [NSMutableDictionary new];
[query setValue:service forKey:(__bridge id)kSecAttrService]; //标识
[query setValue:account forKey:(__bridge id)kSecAttrAccount];//账户
[query setValue:(__bridge id)kSecClassGenericPassword forKey:(__bridge id)kSecClass]; //储存密码
[query setValue:(__bridge id)kCFBooleanTrue forKey:(__bridge id)kSecReturnData];//设置返回数据
OSStatus status = SecItemCopyMatching((__bridge CFDictionaryRef)query, &result);
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增加：
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| NSMutableDictionary *query = [NSMutableDictionary new];
[query setValue:service forKey:(__bridge id)kSecAttrService]; //标识
[query setValue:account forKey:(__bridge id)kSecAttrAccount];//账户
[query setValue:(__bridge id)kSecClassGenericPassword forKey:(__bridge id)kSecClass]; //储存密码
[query setValue:pwdData forKey:(__bridge id)kSecValueData];
status = SecItemAdd((__bridge CFDictionaryRef)query, NULL);
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更新：
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| NSMutableDictionary *query = [NSMutableDictionary new];
[query setValue:service forKey:(__bridge id)kSecAttrService]; //标识
[query setValue:account forKey:(__bridge id)kSecAttrAccount];//账户
[query setValue:(__bridge id)kSecClassGenericPassword forKey:(__bridge id)kSecClass]; //储存密码
NSMutableDictionary *newQuery = [NSMutableDictionary dictionary];
[newQuery setValue:pwdData forKey:(__bridge id)kSecValueData];
status = SecItemUpdate((__bridge CFDictionaryRef)query, (__bridge CFDictionaryRef)newQuery);
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删除：
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| NSMutableDictionary *query = [NSMutableDictionary new];
[query setValue:service forKey:(__bridge id)kSecAttrService]; //标识
[query setValue:account forKey:(__bridge id)kSecAttrAccount];//账户
[query setValue:(__bridge id)kSecClassGenericPassword forKey:(__bridge id)kSecClass]; //储存密码
OSStatus status = SecItemDelete((__bridge CFDictionaryRef)query);
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demo地址：gray’s github
