Question

以下是我要完成的任务：用户触摸按钮，并可以与Facebook分享内容。设置用户触摸按钮的日期，并且用户不能再次与Facebook共享任何内容24秒。 24秒后，用户可以在Facebook上分享另一个帖子。

该错误与facebook无关，但它与elapsedTime有关。重置elapsedTime后，它不会倒数到24.它只会保持一个非常小的数字，如“0.0043”

这是我的代码：

-(void)postToFacebook
{
    if (elapsedTime >= 24) {
        [[CCDirector sharedDirector] pause];
        [[CCDirector sharedDirector] stopAnimation];

        CCAppDelegate *app = (CCAppDelegate*) [[UIApplication sharedApplication] delegate];


        SLComposeViewController *faceBookPost = [SLComposeViewController     composeViewControllerForServiceType:SLServiceTypeFacebook];

        [faceBookPost setInitialText:@"test"];
        [faceBookPost addURL:[NSURL URLWithString:@"http://www.google.com"]];

        [[app navController] presentModalViewController:faceBookPost animated:YES];
        faceBookPost.completionHandler = ^(SLComposeViewControllerResult result)
        {
            [[CCDirector sharedDirector] resume];
            [[CCDirector sharedDirector] startAnimation];
            [[app navController] dismissModalViewControllerAnimated:YES];
            dogeAmount.string = [NSString stringWithFormat:@"%.2LF", _doge];
            [self setDate];
            NSLog(@"Posted to Facebook");
        };
    } else if (elapsedTime < 24) {
        NSLog(@"%f", elapsedTime);
    }
}

以下是上面调用的SetDate：

-(void)setDate {
    NSString *dateString = [NSDateFormatter localizedStringFromDate:[NSDate date]
                                                          dateStyle:NSDateFormatterShortStyle
                                                          timeStyle:NSDateFormatterFullStyle];
    defaults = [NSUserDefaults standardUserDefaults];
    startTime = [NSDate date];
    calendar = [NSCalendar currentCalendar];
    components = [calendar components:(NSHourCalendarUnit | NSMinuteCalendarUnit) fromDate:startTime];
    hour = [components hour];
    minute = [components minute];
    NSNumber *hourNumber = [NSNumber numberWithInteger:hour];
    NSNumber *minuteNumber = [NSNumber numberWithInteger:minute];
    [defaults setObject:startTime forKey:@"startTime"];
    [defaults setObject:hourNumber forKey:@"hour"];
    [defaults setObject:minuteNumber forKey:@"minute"];
    [defaults setInteger:elapsedTime forKey:@"elapsedTime"];
    NSLog(@"%@",dateString);
    elapsedTime = fabs([startTime timeIntervalSinceNow]);
    [defaults synchronize];
}

我无法弄清楚我在这里做错了什么。

Answer 1

·H

@property (strong, nonatomic) NSDate *dateString;

的.m

- (void)share
{
    double dateSinceNow = -[self.dateString timeIntervalSinceNow];

    if (dateSinceNow > 24)
    {
        //share to facebook
    }

    self.dateString = [NSDate date];
}

Answer 2

只需保存日期：

-(void)setStartTime {
    defaults = [NSUserDefaults standardUserDefaults];
    [defaults setObject:[NSDate date] forKey:@"startTime"];
}

稍后检索日期：

- (BOOL)isTimeExpired {
    defaults = [NSUserDefaults standardUserDefaults];
    NSDate *startedDate = [defaults objectForKey:@"startTime"];
    NSTimeInterval elapsedTime = -[startedDate timeIntervalSinceNow];
    return elapsedTime > 24;
}

注意：NSDate只是自2001年1月1日格林威治标准时间第一瞬间以来的秒数。

Answer 3

您不断地将[NSDate date]与现在进行比较，这只是实例化与现在之间的时间。这就是它总是很小的原因。

另外，如果你想禁用一个按钮，为什么不禁用它并安排一个方法在24秒延迟后启用它？

Answer 4

您的基本问题是，您在elapsedTime方法中计算setDate，但在发布Facebook后立即只调用setDate，因此elapsedTime永远不会在初始设定后改变。

我认为您还将发布日期存储在NSUserDefaults中，以便您可以跟踪应用程序启动时的值？如果是这样，你在哪里读取价值？在viewDidLoad？

我会删除elapsedTime变量并创建postDate @property -

@property (strong,nonatomic) NSDate *postDate;

然后，在您的viewDidLoad方法 -

中

self.postDate=[[NSUserdefaults standardUserDefaults] objectForKey:@"postDateKey"];

现在您的postToFaceBook可以 -

-(void)postToFacebook
{
    if (self.postDate ==  nil || [self.postDate timeIntervalSinceNow] > 24) {

        [[CCDirector sharedDirector] pause];
        [[CCDirector sharedDirector] stopAnimation];

        CCAppDelegate *app = (CCAppDelegate*) [[UIApplication sharedApplication] delegate];


        SLComposeViewController *faceBookPost = [SLComposeViewController     composeViewControllerForServiceType:SLServiceTypeFacebook];

        [faceBookPost setInitialText:@"test"];
        [faceBookPost addURL:[NSURL URLWithString:@"http://www.google.com"]];

        [[app navController] presentModalViewController:faceBookPost animated:YES];
        faceBookPost.completionHandler = ^(SLComposeViewControllerResult result)
        {
            [[CCDirector sharedDirector] resume];
            [[CCDirector sharedDirector] startAnimation];
            [[app navController] dismissModalViewControllerAnimated:YES];
            dogeAmount.string = [NSString stringWithFormat:@"%.2LF", _doge];
            self.postDate=[NSDate date];
            [[NSUserDefaults standardDefaults] setObject:self.postDate forKey:@"postDateKey"];
            NSLog(@"Posted to Facebook");
        };
    }
}

Answer 5

这样做的简单方法是从performSelector获取一个空闲计时器：NSObject上的afterDelay：方法，

- (void)disablePosting {
    // set a property that disallows posting, like a bool, or even better
    // do something to the ui that disables, like disabling the button
    self.postingEnabled = NO;
}

- (void)enablePosting {
    self.postingEnabled = YES;
}

然后，要禁用24秒，请执行以下操作：

[self disablePosting];
[self performSelector:@selector(enablePosting) afterDelay:24];

你的FB代码如下：

if (self.postingEnabled) {
    // do the fb request here, without any references to timeout other than

}

现在您可以将所有其他日期和elapsedTime相关代码输出。

一点小问题，记得取消对dealloc的执行请求

- (void)dealloc {
    [NSObject cancelPreviousPerformRequestsWithTarget:self];
}

经过时间和设定日期？

5 个答案: