NSDateFormatter 内存泄漏

Question

在 Instrument 的帮助下，我发现以下代码段存在内存泄漏。 仪器显示 NSDateFormatter 此处内存泄漏。

- (NSDate*) dateSelected{
if(selectedDay < 1 || selectedPortion != 1) return nil;

TKDateInformation info = [monthDate dateInformationWithTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
info.hour = 0;
info.minute = 0;
info.second = 0;
info.day = selectedDay;
NSDate *d = [NSDate dateFromDateInformation:info timeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];


HolidayAppDelegate *delegatObj = (HolidayAppDelegate *)[UIApplication sharedApplication].delegate;

NSDateFormatter  *formatter = [[[NSDateFormatter alloc] init] autorelease];
[formatter setDateFormat:@"MMMM-dd-yyyy"];

    // below line getting leak
NSString *message = [[formatter stringFromDate:d] retain];
delegatObj.selecteddate=message;
NSLog(@" selectd %@ ",delegatObj.selecteddate);
[delegatObj getholiday_forcalnder];

return d;

}

谢谢

Answer 1

这些行更改

NSString *message = [[formatter stringFromDate:d] retain];
delegatObj.selecteddate=message;

通过

 NSString *message = [formatter stringFromDate:d];
  [message retain];
delegatObj.selecteddate=message;
[message release];

这些行还选择了日期是保留类型的属性，因此不要对其直接调用保留。它增加了保留计数。

Answer 2

您不需要保留消息。它将由代表拥有。

Answer 3

试试这个：

- (NSDate*) dateSelected
{
if(selectedDay < 1 || selectedPortion != 1) return nil;

TKDateInformation info = [monthDate dateInformationWithTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];

info.hour = 0;

info.minute = 0;

info.second = 0;

info.day = selectedDay;

NSDate *d = [NSDate dateFromDateInformation:info timeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];


HolidayAppDelegate *delegatObj = (HolidayAppDelegate *)[UIApplication sharedApplication].delegate;

NSDateFormatter  *formatter = [[NSDateFormatter alloc] init];

[formatter setDateFormat:@"MMMM-dd-yyyy"];

NSString *message = [formatter stringFromDate:d];

delegatObj.selecteddate=message;

NSLog(@" selectd %@ ",delegatObj.selecteddate);

[delegatObj getholiday_forcalnder];

[formatter release];

return d;
}