使用 Objective C/Cocoa 从 NSDate 对象中删除时间组件

发布于 2024-09-26 19:43:01 字数 863 浏览 2 评论 0原文

我正在尝试使用 Objective C 编写一个简单的函数，该函数接受 NSDate 对象并返回一个包含相同日期值但已从日期中删除任何时间组件的 NSDate 对象。

例如，如果我要传递值为“2010-10-12 09:29:34”的 NSDate，该函数将返回 2010-10-12 00:00:00。

我正在使用的功能似乎工作正常。然而，当我测试使用 Instruments 开发的 iPhone 应用程序时，它报告我正在使用的函数存在内存泄漏。看看我下面的函数。哪里有内存泄漏？有没有更好的方法来实现我想要的功能？

提前致谢！！

-(NSDate *)dateWithOutTime:(NSDate *)datDate
{
    if (datDate == nil)
    {
        datDate = [NSDate date];
    }

    unsigned int      intFlags   = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit;
    NSCalendar       *calendar   = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
    NSDateComponents *components = [[[NSDateComponents alloc] init] autorelease];

     components = [calendar components:intFlags fromDate:datDate];

     return [calendar dateFromComponents:components];
}

原文

I'm trying to write a simple function using Objective C that accepts an NSDate object and returns an NSDate object that contains the same date value but has removed any time components from the date.

For example if I were to pass an NSDate with a value of '2010-10-12 09:29:34' the function would return 2010-10-12 00:00:00.

The I'm using function seems to work properly. However, when I test the iPhone app I'm developing with Instruments it reports there is a memory leak in the function I'm using. Take a look at my function below. Where is there a memory leak? Is there a better way to achieve the functionality I desire?

Thanks in advance!!

-(NSDate *)dateWithOutTime:(NSDate *)datDate
{
    if (datDate == nil)
    {
        datDate = [NSDate date];
    }

    unsigned int      intFlags   = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit;
    NSCalendar       *calendar   = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
    NSDateComponents *components = [[[NSDateComponents alloc] init] autorelease];

     components = [calendar components:intFlags fromDate:datDate];

     return [calendar dateFromComponents:components];
}

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桃扇骨 2024-10-03 19:43:01

试试这个：

-(NSDate *)dateWithOutTime:(NSDate *)datDate {
    if( datDate == nil ) {
        datDate = [NSDate date];
    }
    NSDateComponents* comps = [[NSCalendar currentCalendar] components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:datDate];
    return [[NSCalendar currentCalendar] dateFromComponents:comps];
}

Try this:

-(NSDate *)dateWithOutTime:(NSDate *)datDate {
    if( datDate == nil ) {
        datDate = [NSDate date];
    }
    NSDateComponents* comps = [[NSCalendar currentCalendar] components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:datDate];
    return [[NSCalendar currentCalendar] dateFromComponents:comps];
}

回复收藏 0 原文

め七分饶幸 2024-10-03 19:43:01

-(NSDate *)dateWithOutTime:(NSDate *)datDate{
    if( datDate == nil ) {
        datDate = [NSDate date];
    }
    NSDateComponents* comps = [[NSCalendar currentCalendar] components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit fromDate:datDate];
    [comps setHour:00];
    [comps setMinute:00];
    [comps setSecond:00];
    [comps setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];

    return [[NSCalendar currentCalendar] dateFromComponents:comps];
}

-(NSDate *)dateWithOutTime:(NSDate *)datDate{
    if( datDate == nil ) {
        datDate = [NSDate date];
    }
    NSDateComponents* comps = [[NSCalendar currentCalendar] components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit fromDate:datDate];
    [comps setHour:00];
    [comps setMinute:00];
    [comps setSecond:00];
    [comps setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];

    return [[NSCalendar currentCalendar] dateFromComponents:comps];
}

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