Question

我不确定，但有时我的if语句会失败并显示错误的内容有什么想法吗？

-(void)updateLabel{



   if (today > Date) {



    [only setHidden:YES];
    [untilRelease setHidden:YES];
    [theLabel setText:@"IS OUT"];


} else {


    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

    int units = NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;

    NSDateComponents *components = [calendar components:units fromDate:[NSDate date] toDate:Date options:0];

    [theLabel setText:[NSString stringWithFormat:@"%d %@, %d %@ \n %d %@, %d %@ %d %@", [components month], @"Months", [components day], @"Days", [components hour], @"Hours", [components minute], @"Minutes and", [components second], @"Seconds"]];


}}

我今天定义为[NSDate date]，Date是一个纪元数字。

任何帮助都会很棒

Answer 1

由于它们都是NSDate个实例，请执行此操作，

NSComparisonResult result = [today compare:Date];
if ( result == NSOrderedDescending ){ //  today > Date
    // After Date
} else {
    // Before Date
}

原始答案

如果today为[NSDate date]且Date为纪元号，则表示您正在比较错误。在比较之前，您应该将today转换为纪元号。

long currentTime = [today timeIntervalSince1970];
if ( currentTime > Date ) {
    // After `Date`
} else {
    // Before `Date`
}

如果声明是气质的

1 个答案: