日期内容的内存泄漏（__NSCFCalendar，icu::GregorianCalendar）

Question

我有一个小方法返回给定日期的第一个工作日：

- (NSDate*) getFirstDayOfTheWeekFor:(NSDate*)date {

NSCalendar *gregorianCalender = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
NSDate *firstDayDate; //This is 100.0% leaking acc. to the Performance Tool Leaks

unsigned yearAndWeek = NSYearCalendarUnit | NSWeekCalendarUnit;

// retrieve the components from the current date
NSDateComponents *compsCurrentDate = [[gregorianCalender components:yearAndWeek fromDate:date] autorelease];

[compsCurrentDate setWeekday:2]; // Monday
[compsCurrentDate setHour:0];
[compsCurrentDate setMinute:0];
[compsCurrentDate setSecond:0];

// make a date from the modfied components
firstDayDate = [[gregorianCalender dateFromComponents:compsCurrentDate] autorelease];   

return firstDayDate;
}

如您所见，我已经在尝试自动释放此处使用的每个变量（这不是我开始追踪之前的样子）泄漏）。最初我想在返回之前显式释放所有变量，除了“firstDayDate”变量，该变量由于返回而必须自动释放。

这些是性能工具发现的泄漏对象：

• icu::GregorianCalendar (1.00 KB)
• icu::SimpleTimeZone (112 字节)
• __NSDate (16 字节)
• icu::NSNumberingSystem (128 字节)
• __NSCFCalendar (48 字节)

错误一定是某些东西完全愚蠢，但我找不到它。你能帮助我吗？谢谢你！！

Answer 1

它应该看起来像这样：

- (NSDate*) getFirstDayOfTheWeekFor:(NSDate*)date
{
    NSCalendar *gregorianCalender = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
    NSDate *firstDayDate; //This is 100.0% leaking acc. to the Performance Tool Leaks

    unsigned yearAndWeek = NSYearCalendarUnit | NSWeekCalendarUnit;

    // retrieve the components from the current date
    NSDateComponents *compsCurrentDate = [gregorianCalender components:yearAndWeek fromDate:date];

    [compsCurrentDate setWeekday:2]; // Monday
    [compsCurrentDate setHour:0];
    [compsCurrentDate setMinute:0];
    [compsCurrentDate setSecond:0];

    // make a date from the modfied components
    firstDayDate = [gregorianCalender dateFromComponents:compsCurrentDate];

    return firstDayDate;
}

如果firstDayDate 泄漏，则它不在这个方法中。检查下游。另外，ICU 部分对我来说看起来有点可疑。这可能是 icu 库周围的 iOS 包装器中的错误/泄漏。

请记住，如果您alloc、init 或copy，则只能release 或autorelease。