Question

我希望在启动app时恢复时间计数器值。首先我的label值是05:00，而不是关闭应用程序后但是当我启动应用程序时，计时器计数开始于05： 00。请帮帮我

int timeSec,timeMin ; 
- (void)viewDidLoad {
    timeSec=0;
    timeMin=0;
    [self StartTimer];
}
-(void) StartTimer
{
    timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerTick:) userInfo:nil repeats:YES];
    [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];


}

//Event called every time the NSTimer ticks.
- (void)timerTick:(NSTimer *)timer
{
    timeSec++;
    if (timeSec == 60)
    {
        timeSec = 0;
        timeMin++;
    }
    //Format the string 00:00
    NSString* timeNow = [NSString stringWithFormat:@"%02d:%02d", timeMin, timeSec];
    //Display on your label
    //[timeLabel setStringValue:timeNow];
    self.lbl_timer.text= timeNow;
}

//Call this to stop the timer event(could use as a 'Pause' or 'Reset')
- (void) StopTimer
{
   // [timer invalidate];
    timeSec = 0;
    timeMin = 0;
    //Since we reset here, and timerTick won't update your label again, we need to refresh it again.
    //Format the string in 00:00
    NSString* timeNow = [NSString stringWithFormat:@"%02d:%02d", timeMin, timeSec];
    //Display on your label
    // [timeLabel setStringValue:timeNow];
    self.lbl_timer.text= timeNow;
}

感谢提前..

Answer 1

在nsuserdefault中尝试此code.store数据

- (void)viewDidLoad {

    timeSec=[[NSString stringWithFormat:@"%ld",(long)[[NSUserDefaults       standardUserDefaults]integerForKey:@"timeSec"]] intValue];
    timeMin=[[NSString stringWithFormat:@"%ld",(long)[[NSUserDefaults standardUserDefaults]integerForKey:@"timeMin"]] intValue];
    [self StartTimer];
}
-(void) StartTimer
{
    timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerTick:) userInfo:nil repeats:YES];
    [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
    self.lbl_timer.text=@"00:00";

}
- (void)timerTick:(NSTimer *)timer
{
    timeSec++;
    if (timeSec == 60)
    {
        [locationManager startUpdatingLocation];
        timeSec = 0;
        timeMin++;
    }
    self.lbl_timer.text= [NSString stringWithFormat:@"%02d:%02d", timeMin, timeSec];;
}

当您回到屏幕时，添加此代码。如后退按钮或关闭按钮操作

[timer invalidate];
                                       [[NSUserDefaults standardUserDefaults]setInteger:timeSec forKey:@"timeSec"];
                                       [[NSUserDefaults standardUserDefaults]setInteger:timeMin forKey:@"timeMin"];

Answer 2

在appdelegate文件中声明两个变量

1）NSUserDefaults * usedefaults; 2）@property（nonatomic，readwrite）int timeSec，timeMin，isBackground;

- (void)applicationDidEnterBackground:(UIApplication *)application 
{
     self.isBackground=1;
     usedefaults=[NSUserDefaults standardUserDefaults];
    [usedefaults setObject:[NSString stringWithFormat:@"%d",self.timeMin] forKey:@"timemin"];
    [usedefaults setObject:[NSString stringWithFormat:@"%d",self.timeSec] forKey:@"timesec"];
    NSLog(@"Enter in back value userdefault %@",usedefaults);
}

- (void)applicationWillEnterForeground:(UIApplication *)application {

    if(self.isBackground==1)
    {
        self.isBackground=0;
        self.timeMin=[[usedefaults objectForKey:@"timemin"] intValue];
        self.timeSec=[[usedefaults objectForKey:@"timesec"] intValue];
        NSLog(@"Foreground value min %d sec %d",self.timeMin,self.timeSec);
    }
}

In ViewDidload in your Timer startpage
app=(AppDelegate *)[[UIApplication sharedApplication] delegate];

最后只需将你的self.timemin替换为app.timemin对timesec。

干杯享受肯定会为你工作..

如何在我启动应用程序时恢复时间计数器值

2 个答案: