设置minuteInterval时UIDatePicker奇怪的行为

Question

以下代码显示了iOS 4.3下的奇怪行为(也许是其他版本).在此示例中,显示UIDatePicker其日期设置为的日期4 Aug 2011 2:31 PM.在UILabel下面UIDatePicker显示的时间以供参考.UIButtons下面的三个,标记为1,5,10,设置minuteInterval为UIDatePicker.

攻丝1 -在显示选择的日期UIDatePicker是4 Aug 2011 2:31 PM,与微小间隔是1,这是可以预料的.

攻丝5 -在显示选定的日期UIDatePicker是4 Aug 2011 2:35 PM,和分钟间隔为5,这是可以预料的(有人会说时间应该四舍五入,但是这不是一个巨大的问题).

攻丝10 -示出了在所选择的日期UIDatePicker是4 Aug 2011 2:10 PM,与微小间隔10好微小间隔是正确的,但所选择的时间是2:10？人们可能会预期2:40(如果向上舍入)或2:30(如果向下舍入).

BugDatePickerVC.h

#import <UIKit/UIKit.h>

@interface BugDatePickerVC : UIViewController {
    NSDateFormatter *dateFormatter;
    NSDate *date;
    UIDatePicker *datePicker;
    UILabel *dateL;
    UIButton *oneB;
    UIButton *fiveB;
    UIButton *tenB;
}

- (void) buttonEventTouchDown:(id)sender;

@end

BugDatePickerVC.m

导入"BugDatePickerVC.h"

@implementation BugDatePickerVC

- (id) init
{
    if ( !(self = [super init]) )
    {
        return self;
    }

    dateFormatter = [[NSDateFormatter alloc] init];
    dateFormatter.dateFormat = @"d MMM yyyy h:mm a";

    date = [[dateFormatter dateFromString:@"4 Aug 2011 2:31 PM"] retain];

    // = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
    // Date picker
    datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 216.0f)];
    datePicker.date = date;
    datePicker.minuteInterval = 1;
    [self.view addSubview:datePicker];

    // = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
    // Label with the date.
    dateL = [[UILabel alloc] initWithFrame:CGRectMake(10.0f, 230.0f, 300.0f, 32.0f)];
    dateL.text = [dateFormatter stringFromDate:date];
    [self.view addSubview:dateL];

    // = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
    // Button that set the date picker's minute interval to 1.
    oneB = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    oneB.frame = CGRectMake(10.0f, 270.0f, 100.0f, 32.0f);
    oneB.tag = 1;
    [oneB setTitle:@"1" forState:UIControlStateNormal];
    [oneB   addTarget:self
               action:@selector(buttonEventTouchDown:)
     forControlEvents:UIControlEventTouchDown];
    [self.view addSubview:oneB];

    // = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
    // Button that set the date picker's minute interval to 5.
    fiveB = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    fiveB.frame = CGRectMake(10.0f, 310.0f, 100.0f, 32.0f);
    fiveB.tag = 5;
    [fiveB setTitle:@"5" forState:UIControlStateNormal];
    [fiveB  addTarget:self
               action:@selector(buttonEventTouchDown:)
     forControlEvents:UIControlEventTouchDown];
    [self.view addSubview:fiveB];

    // = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
    // Button that set the date picker's minute interval to 10.
    tenB = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    tenB.frame = CGRectMake(10.0f, 350.0f, 100.0f, 32.0f);
    tenB.tag = 10;
    [tenB setTitle:@"10" forState:UIControlStateNormal];
    [tenB   addTarget:self
               action:@selector(buttonEventTouchDown:)
     forControlEvents:UIControlEventTouchDown];
    [self.view addSubview:tenB];

    return self;
}

- (void) dealloc
{
    [dateFormatter release];
    [date release];
    [datePicker release];
    [dateL release];
    [oneB release];
    [fiveB release];
    [tenB release];

    [super dealloc];
}

- (void) buttonEventTouchDown:(id)sender
{
    datePicker.minuteInterval = [sender tag];
}

Answer 1

好的,我可以通过UIDatePicker使用以下代码将日期值显式设置为舍入到分钟间隔的日期来更改行为:

- (void) handleUIControlEventTouchDown:(id)sender
{
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    // Set the date picker's minute interval.
    NSInteger minuteInterval  = [sender tag];

    // Setting the date picker's minute interval can change what is selected on
    // the date picker's UI to a wrong date, it does not effect the date
    // picker's date value.
    //
    // For example the date picker's date value is 2:31 and then minute interval
    // is set to 10.  The date value is still 2:31, but 2:10 is selected on the
    // UI, not 2:40 (rounded up) or 2:30 (rounded down).
    //
    // The code that follow's setting the date picker's minute interval
    // addresses fixing the date value (and the selected date on the UI display)
    // .  In the example above both would be 2:30.
    datePicker.minuteInterval = minuteInterval;

    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    // Calculate the proper date value (and the date to be selected on the UI
    // display) by rounding down to the nearest minute interval.
    NSDateComponents *dateComponents = [[NSCalendar currentCalendar] components:NSMinuteCalendarUnit fromDate:date];
    NSInteger minutes = [dateComponents minute];
    NSInteger minutesRounded = ( (NSInteger)(minutes / minuteInterval) ) * minuteInterval;
    NSDate *roundedDate = [[NSDate alloc] initWithTimeInterval:60.0 * (minutesRounded - minutes) sinceDate:date];

    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    // Set the date picker's value (and the selected date on the UI display) to
    // the rounded date.
    if ([roundedDate isEqualToDate:datePicker.date])
    {
        // We need to set the date picker's value to something different than
        // the rounded date, because the second call to set the date picker's
        // date with the same value is ignored. Which could be bad since the
        // call above to set the date picker's minute interval can leave the
        // date picker with the wrong selected date (the whole reason why we are
        // doing this).
        NSDate *diffrentDate = [[NSDate alloc] initWithTimeInterval:60 sinceDate:roundedDate];
        datePicker.date = diffrentDate;
        [diffrentDate release];
    }
    datePicker.date = roundedDate;
    [roundedDate release];
}

注意UIDatePicker日期设置两次的部分.这很有意思.

任何人都知道如何关闭动画来关闭动画minuteInterval？点击5然后点击10时的幻像滚动有点不雅观.

Answer 2

我使用mmoris的上述解决方案并创建了一个返回舍入日期的方法..(对于ARC)

- (NSDate *)getRoundedDate:(NSDate *)inDate{

    NSDate *returnDate;
    NSInteger minuteInterval = 10;
    NSDateComponents *dateComponents = [[NSCalendar currentCalendar] components:NSMinuteCalendarUnit fromDate:inDate];
    NSInteger minutes = [dateComponents minute];
    NSInteger minutesRounded = ( (NSInteger)(minutes / minuteInterval) ) * minuteInterval;
    NSDate *roundedDate = [[NSDate alloc] initWithTimeInterval:60.0 * (minutesRounded - minutes) sinceDate:inDate];

    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    // Set the date picker's value (and the selected date on the UI display) to
    // the rounded date.
    if ([roundedDate isEqualToDate:inDate])
    {
       // We need to set the date picker's value to something different than
       // the rounded date, because the second call to set the date picker's
       // date with the same value is ignored. Which could be bad since the
       // call above to set the date picker's minute interval can leave the
       // date picker with the wrong selected date (the whole reason why we are
       // doing this).
       NSDate *diffrentDate = [[NSDate alloc] initWithTimeInterval:60 sinceDate:roundedDate];
       returnDate = diffrentDate;
       //[diffrentDate release];
    }

    returnDate = roundedDate;
    return returnDate;
}