一.單例模式翔冀，登陸后把用戶數(shù)據(jù)存儲在單例對象我通常是存在AppDelegate,存在這里的好處是,用戶數(shù)據(jù)的生命周期與app運行周期相同,如果app關閉或者閃退,下次開啟app就是未登陸狀態(tài),以下是部分關鍵代碼
AppDelegate.h文件
#import "User.h"
?@interface AppDelegate : UIResponder@property (strong, nonatomic) User *user;
+(AppDelegate*)APP;
@end
//AppDelegate.m文件 這里只是增加了個方便的類方法而
@implementation AppDelegate
+(AppDelegate*)APP {
return (AppDelegate*)[[UIApplication sharedApplication] delegate];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
User 實體
#import "BaseModel.h"
@interface
User : BaseModel
@property(strong,nonatomic)NSString*userID;
@property(strong,nonatomic)NSString*userName;
@property(strong,nonatomic)NSString*passdword;
@property(strong,nonatomic)NSString*cellPhone;
+(NSURLSessionDataTask*)login:(NSDictionary*)paramDic
Success:(void(^)(NSDictionary*result))success
Failure:(void(^)(NSError*error))failue;
@end
在RootViewController(一般都是app的第一個界面即可)中判斷是否存在user對象,如果存在即登陸,可以獲取user實體中的各種信息,如果不存在即未登陸,彈出登錄框,登陸后賦值user對象
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
if (![AppDelegate APP].user) {
? ?LoginViewController *login = [[LoginViewController alloc]init];
? ?[self presentViewController:login animated:YES completion:nil];
? }
}
登陸界面,登陸成功賦值user對象
-(IBAction)loginTouched:(id)sender {
//網絡請求...
[User login:@{@"password":self.password.text,
@"cellphone":self.username.text}
Success:^(NSDictionary*result) {
[AppDelegateAPP].user=[[Useralloc]init];
[AppDelegateAPP].user.cellphone=self.username.text;
[AppDelegateAPP].user.password=self.password.text;
//如果登陸后反回的result是需要存的數(shù)據(jù),確保User model中有對應的結構,之后利用JsonModel(https://github.com/icanzilb/JSONModel)等框架直接進行轉換
比如? [AppDelegateAPP].user=[[Useralloc]
initWithDictionary:result
error:nil];
}
Failure:^(NSError*error){
}];
}
這樣就可以在任意類中[AppDelegate APP].user.cellphone 取類似數(shù)據(jù)了
二. NSUserDefaults .數(shù)據(jù)存儲后可以關閉app后依然存在,只有卸載App 或者手動刪除, 數(shù)據(jù)才會消失
(注:NSUserDefaults存儲的數(shù)據(jù)其實就是存儲在了一個.plist文件中,任何人把設備連接電腦后都可以找到對應文件看見存儲的原文內容,除非你存的時候加了密,所以NSUserDefaults之用來存儲不是很重要的數(shù)據(jù),比如用戶名等)
接著第一種方法登陸的過程,如果我想登陸一次后記錄用戶的用戶名,并且其他數(shù)據(jù)還是隨著app生命周期,那么只需寫入NSUserDefaults即可,記得不要忘了[userDefaults synchronize]
- (IBAction)loginTouched:(id)sender {
//網絡請求...
[User login:@{@"password":self.password.text,
@"cellphone":self.username.text} Success:^(NSDictionary *result) {
[AppDelegate APP].user = [[User alloc]init];
[AppDelegate APP].user.cellphone = self.username.text;
[AppDelegate APP].user.password = self.password.text;
//如果登陸后反回的result是需要存的數(shù)據(jù),確保User model中有對應的結構,之后利用JsonModel(https://github.com/icanzilb/JSONModel)等框架直接進行轉換
比如? [AppDelegate APP].user = [[User alloc] initWithDictionary:result error:nil];
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:self.username.text forKey:@"KEY_USER_NAME"];
[userDefaults synchronize];
} Failure:^(NSError *error) {
}];
}
關閉app后,從新進入app,想讀取這個數(shù)據(jù)只需要任意類中,即可獲得存下的數(shù)據(jù)
NSUserDefaults*userDefaults=[NSUserDefaultsstandardUserDefaults];
NSString*username=[userDefaults
objectForKey:@"KEY_USER_NAME"];
三.鑰匙串听系，數(shù)據(jù)可以刪除app后依然存在,鑰匙串由操作系統(tǒng)保護并且存儲后的數(shù)據(jù)是比較安全的,長用來存儲一些密碼,私鑰
如果想存儲用戶的密碼,當然可以存在NSUserDefaults中,但是直接存到 plist 里顯然是不負責任的
用ios的 Security.framework 就可以實現(xiàn)鑰匙串的訪問弛饭、讀寫
這里我借助第三方開源庫SSKeychain(https://github.com/soffes/sskeychain)與NSUserDefaults配合使用進行示例,如果想用原生方法自行學習
以下是User實體新增的三個類方法 用于操作信息
//清除數(shù)據(jù)
+ (void)logoutAccount{
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSString *username = [userDefaults objectForKey:@"KEY_USER_NAME"];
[SSKeychain deletePasswordForService:@"KEY_KEYCHAIN_SERVICE" account:username];
[userDefaults removeObjectForKey:@"KEY_USER_NAME"];
[userDefaults synchronize];
}
//獲取? 任意位置調用
+ (void)getAccount:(void (^)(NSString *username,NSString *password))block{
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSString *username = [userDefaults objectForKey:@"KEY_USER_NAME"];
NSString *password = [SSKeychain passwordForService:@"KEY_KEYCHAIN_SERVICE" account:username];
block(username?:@"",password?:@"");
}
//保存方法 登陸成功后調用
+ (void)saveAccount:(NSString *)name andPassword:(NSString *)password {
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:name forKey:@"KEY_USER_NAME"];
[userDefaults synchronize];
[SSKeychain setPassword:password forService:@"KEY_KEYCHAIN_SERVICE" account:name];
}
還是登陸的例子
Objective-C
-(IBAction)loginTouched:(id)sender{
//網絡請求...
[User
login:@{@"password":self.password.text,
@"cellphone":self.username.text}
Success:^(NSDictionary*result){
[User
saveAccount:self.username.text
andPassword:self.password.text];
}
Failure:^(NSError*error){
}];
}
