iphone - 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 此处泄漏内存。

- (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

更改这些行

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

按这些行

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

所选日期也是保留类型的属性，因此不要对其直接调用保留。它增加了保留计数。