UIDatePicker odd behavior when setting minuteInterval

最新推荐文章于 2022-06-27 00:29:58 发布

speedboy007

最新推荐文章于 2022-06-27 00:29:58 发布

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本文介绍了一个针对 UIDatePicker 的 Objective-C 类别，该类别提供了按分钟间隔舍入日期的功能，确保 UIDatePicker 在设定最小日期和当前日期时能够符合指定的分钟间隔。

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http://stackoverflow.com/questions/6948297/uidatepicker-odd-behavior-when-setting-minuteinterval

Here's yet another approach, with an Objective-C category!

I took the spirit of @zurbergram's rounding behavior (up/down to closest) and @mmorris's overall answer and came up with this category:

#import <UIKit/UIKit.h>

@interface UIDatePicker (SetDateRounded)

-(void)setMinimumDateRoundedByMinuteInterval:(NSDate *)minimumDate;
-(void)setDateRoundedByMinuteInterval:(NSDate *)date animated:(BOOL)animatedYesNo;

@end

@implementation UIDatePicker (SetDateRounded)

-(void)setDateRoundedByMinuteInterval:(NSDate *)date animated:(BOOL)animatedYesNo
{
    NSDateComponents *dateComponents = [[NSCalendar currentCalendar] components:NSMinuteCalendarUnit fromDate:date];
    NSInteger minutes = [dateComponents minute];
    NSInteger minutesRounded = roundf((float)minutes / (float)[self minuteInterval]) * self.minuteInterval;
    NSDate *roundedDate = [[NSDate alloc] initWithTimeInterval:60.0 * (minutesRounded - minutes) sinceDate:date];
    [self setDate:roundedDate animated:animatedYesNo];
}

-(void)setMinimumDateRoundedByMinuteInterval:(NSDate *)date
{
    NSDateComponents *dateComponents = [[NSCalendar currentCalendar] components:NSMinuteCalendarUnit fromDate:date];
    NSInteger minutes = [dateComponents minute];
    NSInteger minutesRounded = roundf((float)minutes / (float)[self minuteInterval]) * self.minuteInterval;
    NSDate *roundedDate = [[NSDate alloc] initWithTimeInterval:60.0 * (minutesRounded - minutes) sinceDate:date];
    [self setMinimumDate:roundedDate];
}

@end

Then in your implementation, you can do something like this:

#import "UIDatePicker+SetDateRounded.h"

...

- (void)viewDidLoad
{
    [super viewDidLoad];

    _datePicker.minuteInterval = 15;

    [_datePicker setMinimumDateRoundedByMinuteInterval:[NSDate date]];
    [_datePicker setDateRoundedByMinuteInterval:[NSDate date] animated:YES];
}