利用Keychain保存敏感信息
如何使用？
第一步：下载后将『SZYKeychain.h』、『SZYKeychain.m』两个文件导入项目。
第二步：定义几个Key
static NSString *const kSZYKeyChain_USERNAME_PASSWORD = @"cc.suzhenyu.usernamepassword";
static NSString *const kSZYKeyChain_USERNAME = @"cc.suzhenyu.username";
static NSString *const kSZYKeyChain_PASSWORD = @"cc.suzhenyu.password";
第三步： 存：
NSMutableDictionary *dataDict = [[NSMutableDictionary alloc] init];
[dataDict setObject:@"root" forKey:kSZYKeyChain_USERNAME];
[dataDict setObject:@"123456" forKey:kSZYKeyChain_PASSWORD];
[SZYKeychain saveKeychain:kSZYKeyChain_USERNAME_PASSWORD withData:dataDict];
取：
NSMutableDictionary *dataDict = (NSMutableDictionary *)[SZYKeychain loadKeychain:kSZYKeyChain_USERNAME_PASSWORD];
NSLog(@"username:%@,password:%@",[dataDict objectForKey:kSZYKeyChain_USERNAME],[dataDict objectForKey:kSZYKeyChain_PASSWORD]);
删：
[SZYKeychain deleteKeyChain:kSZYKeyChain_USERNAME_PASSWORD];