上一篇博客 开源中国iOS客户端学习——(十一)AES加密中提到将用户名和密码保存到了本地沙盒之中，在从本地读取用户名和密码，这是一个怎样的过程？
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-(
void
)saveUserNameAndPwd:(NSString *)userName andPwd:(NSString *)pwd
{
NSUserDefaults * settings = [NSUserDefaults standardUserDefaults];
[settings removeObjectForKey:@
"UserName"
];
[settings removeObjectForKey:@
"Password"
];
[settings setObject:userName forKey:@
"UserName"
];
pwd = [AESCrypt encrypt:pwd password:@
"pwd"
];
[settings setObject:pwd forKey:@
"Password"
];
[settings synchronize];
}
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上面的方法使用了NSUserDefaults类，它也是以字典形式实现对数据功能，并将这些数据保存到本地应用程序沙盒之中，这种方法适合保存较小的数据，例如用户登陆配置信息；这段代码首先是定义了一个对象，进行初始化，移除键值为UseName和Password的对象，防止数据混乱造成干扰；然后就是重新设置键值信息； [settings synchronize];将键值信息同步道本地；
现在我们道沙盒中来看看这个用户配置信息
首先查看应用程序沙盒的路径 ，使用
NSString *homeDirectory = NSHomeDirectory(); NSLog(@"path:%@", homeDirectory);
打印结果: path:/Users/DolBy/Library/Application Support/iPhone Simulator/5.1/Applications/55C49712-AD95-49E0-B3B9-694DC7D26E94
但是在我的DolBy用户下并没有Library这个目录，这是因为系统隐藏了这些文件目录，现在需要显示这些隐藏的文件，打开终端输入 defaults write com.apple.finder AppleShowAllFiles -bool true 回车，然后重启Finder(不会？请看 查看iOS沙盒(SanBox)文件),找到55C49712-AD95-49E0-B3B9-694DC7D26E94目录下的Library/Preferences下的 net.oschina.iosapp.plist文件，将其打开
![154949993.png]( "QQ20130522-4.png")
![154950176.png]( "QQ20130522-5.png")
从中不难看出保存在本地沙盒中用户的一些基本信息，以及一些配置信息，还记录一些上次获取数据时间等等；
登陆类在Setting目录下的loginView类,先看看loginView.xib吧，界面比较简陋，可能是缺美工吧；
![155043408.png]( "QQ20130522-6.png")
![155043398.png]( "QQ20130522-8.png")
从头文件中声明部分
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#import <UIKit/UIKit.h>
#import "Tool.h"
#import "ProfileBase.h"
#import "MessageView.h"
#import "Config.h"
#import "MBProgressHUD.h"
#import "MyThread.h"
@interface LoginView : UIViewController<UIWebViewDelegate>
{
ASIFormDataRequest *request;
}
@property (strong, nonatomic) IBOutlet UITextField *txt_Name;
@property (strong, nonatomic) IBOutlet UITextField *txt_Pwd;
@property (strong, nonatomic) IBOutlet UISwitch *switch_Remember;
@property
BOOL
isPopupByNotice;
@property (strong, nonatomic) IBOutlet UIWebView *webView;
- (IBAction)click_Login:(id)sender;
- (IBAction)textEnd:(id)sender;
- (IBAction)backgrondTouch:(id)sender;
- (
void
)analyseUserInfo:(NSString *)xml;
@end
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在实现文件里，粘贴上主要方法代码
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- (
void
)viewDidLoad
{
[super viewDidLoad];
[Tool clearWebViewBackground:webView];
[self.webView setDelegate:self];
self.navigationItem.title = @
"登录"
;
NSString *name = [Config Instance].getUserName;
NSString *pwd = [Config Instance].getPwd;
if
(name && ![name isEqualToString:@
""
]) {
self.txt_Name.text = name;
}
if
(pwd && ![pwd isEqualToString:@
""
]) {
self.txt_Pwd.text = pwd;
}
UIBarButtonItem *btnLogin = [[UIBarButtonItem alloc] initWithTitle:@
"登录"
style:UIBarButtonItemStyleBordered target:self action:@selector(click_Login:)];
self.navigationItem.rightBarButtonItem = btnLogin;
self.view.backgroundColor = [Tool getBackgroundColor];
self.webView.backgroundColor = [Tool getBackgroundColor];
NSString *html = @
"<body style='background-color:#EBEBF3'>1, 您可以在 <a href='http://www.oschina.net'>http://www.oschina.net</a> 上免费注册一个账号用来登陆<p />2, 如果您的账号是使用OpenID的方式注册的，那么建议您在网页上为账号设置密码<p />3, 您可以点击 <a href='http://www.oschina.net/question/12_52232'>这里</a> 了解更多关于手机客户端登录的问题</body>"
;
[self.webView loadHTMLString:html baseURL:nil];
self.webView.hidden = NO;
}
在 [Tool clearWebViewBackground:webView];作用描述不好，直接看方法
+ (
void
)clearWebViewBackground:(UIWebView *)webView
{
UIWebView *web = webView;
for
(id v in web.subviews) {
if
([v isKindOfClass:[UIScrollView
class
]]) {
[v setBounces:NO];
}
}
}
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[v setBounces:NO]; 如果[v setBounces:YES]; 滚动上下滚动是出现空隙，不美观，为NO 时就不会；
![155213368.png]( "QQ20130522-9.png")
![155213624.png]( "QQ20130522-10.png")
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- (IBAction)click_Login:(id)sender
{
NSString *name = self.txt_Name.text;
NSString *pwd = self.txt_Pwd.text;
request = [ASIFormDataRequest requestWithURL:[NSURL URLWithString:api_login_validate]];
[request setUseCookiePersistence:YES];
[request setPostValue:name forKey:@
"username"
];
[request setPostValue:pwd forKey:@
"pwd"
];
[request setPostValue:@
"1"
forKey:@
"keep_login"
];
[request setDelegate:self];
[request setDidFailSelector:@selector(requestFailed:)];
[request setDidFinishSelector:@selector(requestLogin:)];
[request startAsynchronous];
request.hud = [[MBProgressHUD alloc] initWithView:self.view];
[Tool showHUD:@
"正在登录"
andView:self.view andHUD:request.hud];
}
- (
void
)requestFailed:(ASIHTTPRequest *)request
{
if
(request.hud) {
[request.hud hide:YES];
}
}
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- (
void
)requestLogin:(ASIHTTPRequest *)request
{
if
(request.hud) {
[request.hud hide:YES];
}
[Tool getOSCNotice:request];
[request setUseCookiePersistence:YES];
ApiError *error = [Tool getApiError:request];
if
(error == nil) {
[Tool ToastNotification:request.responseString andView:self.view andLoading:NO andIsBottom:NO];
}
switch
(error.errorCode) {
case
1:
{
[[Config Instance] saveCookie:YES];
if
(isPopupByNotice == NO)
{
NSUserDefaults *d= [NSUserDefaults standardUserDefaults];
[self.navigationController popViewControllerAnimated:YES];
}
if
(self.switch_Remember.isOn)
{
[[Config Instance] saveUserNameAndPwd:self.txt_Name.text andPwd:self.txt_Pwd.text];
}
else
{
[[Config Instance] saveUserNameAndPwd:@
""
andPwd:@
""
];
}
if
([Config Instance].viewBeforeLogin)
{
if
([[Config Instance].viewNameBeforeLogin isEqualToString:@
"ProfileBase"
])
{
ProfileBase *_parent = (ProfileBase *)[Config Instance].viewBeforeLogin;
_parent.isLoginJustNow = YES;
}
}
[self analyseUserInfo:request.responseString];
if
(self.isPopupByNotice) {
[self.navigationController popViewControllerAnimated:YES];
}
[[MyThread Instance] startNotice];
}
break
;
case
0:
case
-1:
{
[Tool ToastNotification:[NSString stringWithFormat:@
"错误 %@"
,error.errorMessage] andView:self.view andLoading:NO andIsBottom:NO];
}
break
;
}
}
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ApiError 这个类看起来可能很迷惑人，它并不完全像字面意思那样指的是错误的api信息，而是根据请求返回来的数字进行判断。如果error.errorCode = 1表示成功返回了用户的数据，0，-1就可能由于服务器网络等原因不能正确返回数据；
在ApiError *error = [Tool getApiError:request];中，打印 request.responseString如下，
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<?
xml
version
=
"1.0"
encoding
=
"UTF-8"
?>
<
oschina
>
<
result
>
<
errorCode
>1</
errorCode
>
<
errorMessage
>
<![CDATA[登录成功]]>
</
errorMessage
>
</
result
>
<
user
>
<
uid
>112617</
uid
>
<
location
>
<![CDATA[河南 南阳]]>
</
location
>
<
name
>
<![CDATA[新风作浪]]>
</
name
>
<
followers
>1</
followers
>
<
fans
>0</
fans
>
<
score
>1</
score
>
<
portrait
>http://static.oschina.net/uploads/user/56/112617_100.jpg?t=1350377690000</
portrait
>
</
user
>
<
notice
>
<
atmeCount
>0</
atmeCount
>
<
msgCount
>0</
msgCount
>
<
reviewCount
>0</
reviewCount
>
<
newFansCount
>0</
newFansCount
>
</
notice
>
</
oschina
>
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在 [self analyseUserInfo:request.responseString]方法中， 根据请求成功返回的xml,解析用户名和UID,保存用户的UID
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- (
void
)analyseUserInfo:(NSString *)xml
{
@
try
{
TBXML *_xml = [[TBXML alloc] initWithXMLString:xml error:nil];
TBXMLElement *root = _xml.rootXMLElement;
TBXMLElement *user = [TBXML childElementNamed:@
"user"
parentElement:root];
TBXMLElement *uid = [TBXML childElementNamed:@
"uid"
parentElement:user];
[[Config Instance] saveUID:[[TBXML textForElement:uid] intValue]];
}
@
catch
(NSException *exception) {
[NdUncaughtExceptionHandler TakeException:exception];
}
@finally {
}
}
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在后面也看到[[MyThread Instance] startNotice];看看startNotice方法，是一个定时器，每隔60s刷新一下用户信息，是否有新的粉丝或几条评论；
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-(
void
)startNotice
{
if
(isRunning) {
return
;
}
else
{
timer = [NSTimer scheduledTimerWithTimeInterval:60 target:self selector:@selector(timerUpdate) userInfo:nil repeats:YES];
isRunning = YES;
}
}
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-(
void
)timerUpdate
{
NSString * url = [NSString stringWithFormat:@
"%@?uid=%d"
,api_user_notice,[Config Instance].getUID];
[[AFOSCClient sharedClient]getPath:url parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
[Tool getOSCNotice2:operation.responseString];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
}];
}
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url请求获取返回的信息(已经登陆情开源中国社区网站的况下)
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<
oschina
>
<
notice
>
<
atmeCount
>0</
atmeCount
>
<
msgCount
>0</
msgCount
>
<
reviewCount
>0</
reviewCount
>
<
newFansCount
>0</
newFansCount
>
</
notice
>
</
oschina
>
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关于本文提到的几个动画过渡显示效果请看
[Tool showHUD:@"正在登录" andView:self.view andHUD:request.hud]; MBProgressHUD特效
[Tool ToastNotification:[NSString stringWithFormat:@"错误 %@",error.errorMessage] andView:self.view andLoading:NO andIsBottom:NO]; GCDiscreetNotificationView提示视图
开源中国iOS客户端源码下载地址: http://git.oschina.net/oschina/iphone-app
本文转自新风作浪 51CTO博客，原文链接：http://blog.51cto.com/duxinfeng/1206850，如需转载请自行联系原作者
