Question

我正在尝试在iOS应用上创建一个catch，以防止人们访问小窗口之外的内容。

基本上，我需要采取的行动只有在伦敦星期日（BST时区）的12-1：30 PM之间才会开火。我如何检查当前时间，将其转换为该时区，然后查看它是否匹配？

我尝试过以下操作，但它总是显示它在该范围之间：

- (NSDate *)dateByNeutralizingDateComponentsOfDate:(NSDate *)originalDate {
    NSCalendar *gregorian = [[[NSCalendar alloc]
                              initWithCalendarIdentifier:NSGregorianCalendar] autorelease];

    // Get the components for this date
    NSDateComponents *components = [gregorian components:  (NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit) fromDate: originalDate];

    // Set the year, month and day to some values (the values are arbitrary)
    [components setYear:2000];
    [components setMonth:1];
    [components setDay:1];

    return [gregorian dateFromComponents:components];
}

- (BOOL)isTimeOfDate:(NSDate *)targetDate betweenStartDate:(NSDate *)startDate andEndDate:(NSDate *)endDate {
    if (!targetDate || !startDate || !endDate) {
        return NO;
    }

    // Make sure all the dates have the same date component.
    NSDate *newStartDate = [self dateByNeutralizingDateComponentsOfDate:startDate];
    NSDate *newEndDate = [self dateByNeutralizingDateComponentsOfDate:endDate];
    NSDate *newTargetDate = [self dateByNeutralizingDateComponentsOfDate:targetDate];

    // Compare the target with the start and end dates
    NSComparisonResult compareTargetToStart = [newTargetDate compare:newStartDate];
    NSComparisonResult compareTargetToEnd = [newTargetDate compare:newEndDate];

    return (compareTargetToStart == NSOrderedDescending && compareTargetToEnd == NSOrderedAscending);
}
-(void)checkDate {
 NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
        [dateFormatter setDateFormat:@"EEEE HH:mm"];
        NSTimeZone *timeZone = [NSTimeZone timeZoneWithAbbreviation:@"BST"];
        [dateFormatter setTimeZone:timeZone];
        NSDate *openingDate = [dateFormatter dateFromString:@"Sunday 12:00"];
        NSDate *closingDate = [dateFormatter dateFromString:@"Sunday 1:30"];
        NSDate *targetDate = [NSDate date];

        if ([self isTimeOfDate:targetDate betweenStartDate:openingDate andEndDate:closingDate]) {
            NSLog(@"TARGET IS INSIDE!");
        }else {
            NSLog(@"TARGET IS NOT INSIDE!");
        }

}

Answer 1

我假设您想要使用当前在英格兰观察的时间，而不是BST，因为BST是英国夏天时间。我的理解是，在冬季，他们使用UTC（以前称为GMT）。因此，我们应该以一种方式指定时区，该方式将根据一年中的时间从UTC中选择适当的偏移量。

static BOOL dateIsAcceptable(NSDate *date) {
    NSCalendar *calendar = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian];
    calendar.timeZone = [NSTimeZone timeZoneWithName:@"Europe/London"];
    NSDateComponents *components = [calendar
        components:NSCalendarUnitWeekday | NSCalendarUnitHour | NSCalendarUnitMinute
        fromDate:date];
    if (components.weekday != 1) {
        return NO;
    }
    double hour = components.hour + components.minute / 60.0;
    return hour >= 12 && hour < 13.5;
}

当前时间是否匹配一系列时间？

1 个答案: