Iphone 如何检查userdefaults中数组的每个对象

我正在将从数组中的选择器中选择的日期保存到userdefaults中。因此，当我选择一个特定日期并单击“保存”时，该特定日期将保存在userdefaults中。这是正确的。但现在我遇到了问题。我需要将userdefaults的每个日期和时间与当前时间进行比较。如果某个对象与当前日期和时间相等，则应显示通知。这是如何实现的可能，谢谢。这是我的密码 在这里，我通过日期选择器选择日期，并将日期保存在userdefaults中

this is my timepickercontroller.m

- (void)viewDidLoad {
     time = [[NSString alloc] init]; 
    CGRect pickerFrame = CGRectMake(0,40,0,0); 

    datePicker = [[UIDatePicker alloc] initWithFrame:pickerFrame]; 
    datePicker.datePickerMode = UIDatePickerModeTime; 
    datePicker.date = [NSDate date];
    [datePicker addTarget:self action:@selector(convertDueDateFormat) forControlEvents:UIControlEventValueChanged]; 
    [self.view addSubview:datePicker]; 

    [datePicker release];


 }

-(void)convertDueDateFormat{

    app = (StopSnoozeAppDelegate*)[[UIApplication sharedApplication]delegate];
    app.timerdate = [self.datePicker date];
    NSLog(@"picker date:%@",selecteddate);  
    if ([[NSUserDefaults standardUserDefaults] valueForKey:@"time"]==nil)
    {
        [[NSUserDefaults standardUserDefaults] setObject:[NSDate date] forKey:@"time"];
        [[NSUserDefaults standardUserDefaults] synchronize];
        NSLog(@"%@",[[NSUserDefaults standardUserDefaults] objectForKey:@"time"]);
    }
    else
    {
        NSArray *array = [[NSUserDefaults standardUserDefaults] objectForKey:@"time"];
        NSMutableArray *array_dates = [[NSMutableArray alloc] init];
        for(int i =0;i<[array count];i++)
        {
            [array_dates addObject:[array objectAtIndex:i]];
        }
        [array_dates addObject:app.timerdate];
        [[NSUserDefaults standardUserDefaults] setObject:array_dates forKey:@"time"];
        [[NSUserDefaults standardUserDefaults] synchronize];
        NSLog(@"%@",[[NSUserDefaults standardUserDefaults] objectForKey:@"time"]);
    }   

   }


this is the controller where i am setting notification


-(IBAction)save{

    dateFormatter = [[NSDateFormatter alloc]init];
    [dateFormatter setDateFormat:@"hh:mm a"];
    NSDate *currentime = [NSDate date];
    currentcheck = [NSString stringWithFormat:@"%@",[dateFormatter stringFromDate:currentime] ];
    NSLog(@"currenttime:%@",currentcheck);

    timepicker = [[TTimePickerController alloc]init];
        if (app.timerdate == NULL && interval == NULL && newsound == NULL)
    {
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"UIAlertView" message:@"Set Date,interval,sound for alarm" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        [alert release];
        alert = nil;
    }
    else
    {
                    [self scheduleNotification];
        [self saveInDatabase];

    }

}



-(void)scheduleNotification
{
    [[UIApplication sharedApplication]cancelAllLocalNotifications];


    timepicker = [[TTimePickerController alloc]init];
        NSDate *newtestdate = [[NSUserDefaults standardUserDefaults]objectForKey:@"time"];

    NSLog(@"fireDate=%@", newtestdate);

    NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar];
    NSDateComponents *dateComponents = [calendar components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:newtestdate];
    NSDateComponents *timeComponents = [calendar components:NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit fromDate:newtestdate];


    NSDateComponents *dateComps = [[NSDateComponents alloc]init];
    [dateComps setDay:[dateComponents day]];
    [dateComps setMonth:[dateComponents month]];
    [dateComps setYear:[dateComponents year]];
    [dateComps setHour:[timeComponents hour]];
    [dateComps setMinute:[timeComponents minute]];
    [dateComps setSecond:[timeComponents second]];

    itemDate = [calendar dateFromComponents:dateComps];
    [dateComps release];



    Class cls = NSClassFromString(@"UILocalNotification");
    if (cls!= nil) {

        UILocalNotification *notif = [[cls alloc]init];
            notif.fireDate = itemDate;
        [app.dateFormatter setDateFormat:@"hh:mm a"];
        newstring = [app.dateFormatter stringFromDate:notif.fireDate];
        NSLog(@"new fire date:%@",newstring);

        notif.timeZone = [NSTimeZone defaultTimeZone];
        notif.alertBody = @"Alarm";
        notif.alertAction = @"View";
        notif.soundName = UILocalNotificationDefaultSoundName;
        notif.applicationIconBadgeNumber=1;
        notif.repeatInterval = 0;
        [[UIApplication sharedApplication]scheduleLocalNotification:notif];
        [notif release];
    }
}

这是我的timepickercontroller.m
-（无效）viewDidLoad{
时间=[[NSString alloc]init]；
CGRect pickerFrame=CGRectMake（0,40,0,0）；
datePicker=[[UIDatePicker alloc]initWithFrame:pickerFrame]；
datePicker.datePickerMode=UIDatePickerModeTime；
datePicker.date=[NSDate-date]；
[datePicker addTarget:self action:@selector（convertDueDateFormat）for ControlEvents:UIControlEventValueChanged]；
[self.view addSubview:datePicker]；
[日期选择器发布]；
}
-（void）convertDueDateFormat{
app=（StopSnoozeAppDelegate*）[[UIApplication sharedApplication]委托]；
app.timerdate=[self.datePicker date]；
NSLog（@“选取者日期：%@”，选择日期）；
如果（[[NSUserDefaults standardUserDefaults]valueForKey:@“time”]==nil）
{
[[NSUserDefaults standardUserDefaults]设置对象：[NSDate date]forKey:@“time”]；
[[NSUserDefaults standardUserDefaults]同步]；
NSLog（@“%@，[[NSUserDefaults standardUserDefaults]objectForKey:@“time”]）；
}
其他的
{
NSArray*数组=[[NSUserDefaults standardUserDefaults]objectForKey:@“time”]；
NSMutableArray*数组_dates=[[NSMutableArray alloc]init]；
对于（int i=0；i
}
我怀疑您真正想做的不是比较日期，而是将通知的触发日期设置为从阵列中获取的日期

为此，请枚举阵列并为每个timerDate启动NSNotification：


    NSArray *timerDates = [NSUser Defaults standardUserDefaults] objectforKey:@"time"];
    NSDate *now = [NSDate date];

    UILocalNotification *localNotif = [[UILocalNotification alloc] init];  
    // .... general setup of all notifs here.

    for (NSDate * aDate in timerDates) {  

       localNotif.fireDate = aDate;  
        //... further setup of each individual notif here....
        [[UIApplication sharedApplication] scheduleLocalNotification:localNotif];  
    }

    [localNotif release]; 
但是，从您的代码来看，您似乎从默认值中获得了一个日期：

NSDate *newtestdate = [[NSUserDefaults standardUserDefaults]objectForKey:@"time"];

但是您在方法中保存了一个数组

-(void)convertDueDateFormat{
        ...
        [[NSUserDefaults standardUserDefaults] setObject:array_dates forKey:@"time"];

那是哪一个呢？
如果有数组，则可以将其值作为日期进行测试：

NSArray *timerDates = [NSUser Defaults standardUserDefaults] objectforKey:@"time"];
NSDate *now = [NSDate date];
_block int timerIndex;  // can be changed inside the block

// use a block to enumerate the array
[timerDates enumerateObjectsUsingBlock:^(id obj,NSUInteger index, BOOL *stop){
    if(fabs([(NSDate *)obj timeIntervalSinceDate:now])< 1.0) {
       *stop=YES;
       timerIndex = index;
    }
} ]; 

当然，也可以查看用于比较日期的文档（NSDate的Apple类文档很好）。这只是一种方法，可能不是最好的方法。

（对我的格式设置很抱歉。我对这个有点陌生）
为什么要直接检查设置本地通知的时间？使用objectForKey方法和NSUserDefaults检索数组。然后可以使用简单的for循环将当前时间与数组中的每个对象进行比较。希望如此helps@booleanBoy请你详细解释一下或者提供一些代码，因为我从来没有这样做过习惯于nsuserdefaults@booleanBoy如何将当前时间与arraybut suz中的每个对象进行比较我有点困惑。例如，如何设置与arrayStep匹配的日期步骤1：检查文档中的NSNotification！！firedate不是NSString，而是NSDate。步骤2：检查文档中的NSDate。NSDate是自格林威治标准时间2001年1月1日00:00:00以来的秒数。这是一个数字，与时区无关。NSDate将在NSDate发送通知。当您将NSDate保存为默认值时，它与用户默认时区在日期选择器中显示的日期相关。如果不是，请将firedate设置为中的值阵列。
NSArray *timerDates = [NSUser Defaults standardUserDefaults] objectforKey:@"time"];
NSDate *now = [NSDate date];
_block int timerIndex;  // can be changed inside the block

// use a block to enumerate the array
[timerDates enumerateObjectsUsingBlock:^(id obj,NSUInteger index, BOOL *stop){
    if(fabs([(NSDate *)obj timeIntervalSinceDate:now])< 1.0) {
       *stop=YES;
       timerIndex = index;
    }
} ]; 

localNotif.firedate = [timerDates objectAtIndex:timerIndex];