如何实现iPhone本地应用程序的web用户会话概念以自动注销?

伪代码:

1. 运行一个计时器,在时间结束后(会话超时时间)调用一个方法。
2. 该方法应导航到“登录”活动
3. 如果用户与应用程序有任何交互,请重置计时器。

代码:

1) 创建新文件->Objective-C类->键入名称(在我的情况下为SessionApplication)

2) 将子类更改为UIApplication。您可能需要在子类字段中手动键入此项。

现在应该有适当的.h和.m文件。

将.h文件更改为如下所示:

 #import <Foundation/Foundation.h>  

 //the length of time before your application "times out". This number actually represents seconds, so we'll have to multiple it by 60 in the .m file
             #define SessionTimeoutPeriodMins 5

 //the notification your AppDelegate needs to watch for in order to know that it has indeed "timed out"
 #define kapplicationDidSessionTimeoutNotification @"AppTimeOut"


    @interface SessionApplication : UIApplication
    {
            NSTimer     *mySessionTimer;
    }

    -(void)resetSessionTimer;

    @end

将.m文件更改为如下所示: ¨

#import "SessionApplication.h"

            @implementation SessionApplication

            //here we are listening for any touch. If the screen receives touch, the timer is reset
            -(void)sendEvent:(UIEvent *)event
            {
            [super sendEvent:event];

            if (!mySessionTimer)
            {
                [self resetSessionTimer];
                }

            NSSet *allTouches = [event allTouches];
                if ([allTouches count] > 0)
                {
                UITouchPhase phase = ((UITouch *)[allTouches anyObject]).phase;
                    if (phase == UITouchPhaseBegan)
                    {
                    [self resetSessionTimer];
                }

                }
            }
        //as labeled...reset the timer
        -(void)resetSessionTimer
        {
            if (mySessionTimer)
            {
                [mySessionTimer invalidate];
            }
            //convert the wait period into minutes rather than seconds
            int timeout = SessionTimeoutPeriodMins * 60;
            mySessionTimer = [NSTimer scheduledTimerWithTimeInterval:timeout target:self selector:@selector(sessionTimedOut) userInfo:nil repeats:NO];

        }
        //if the timer reaches the limit as defined in SessionTimeoutPeriodMins, post this notification
            -(void)sessionTimedOut
        {
                [[NSNotificationCenter defaultCenter] postNotificationName:kapplicationDidSessionTimeoutNotification object:nil];
            }


        @end

进入“支持文件”文件夹,将main.m更改为(与以前版本的XCode不同):¨

#import <UIKit/UIKit.h> 
#import "AppDelegate.h"
#import "SessionApplication.h"

int main(int argc, char *argv[])
{
    @autoreleasepool {
        return UIApplicationMain(argc, argv, NSStringFromClass([SessionApplication class]), NSStringFromClass([AppDelegate class]));
    }
 }

在AppDelegate.m文件中写入剩余的代码。我遗漏了与此过程无关的代码。.h文件中没有要进行的更改。

#import "AppDelegate.h"
    #import "SessionApplication.h"

@implementation AppDelegate

    @synthesize window = _window;

    -(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
    {      
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidSessionTimeout:) name:kapplicationDidSessionTimeoutNotification object:nil];

    return YES;
    }

        -(void)applicationDidSessionTimeout:(NSNotification *) notif
   {
    NSLog (@“session timed out!!");
    //Get the controller to login activity

    }

Reference

Sample