iPhone SDK中文本字段的內存泄漏

Question

我在文本字段中遇到內存泄漏，請建議我如何解決它。

我在init（）中編寫的代碼為：

            eventTextField = nil;
    eventTextField = [[UITextField alloc]initWithFrame:CGRectMake(10, 15, 300, 50)];
    eventTextField.placeholder = @"Event Name";
    [eventTextField setFont:[UIFont boldSystemFontOfSize:14]];
    eventTextField.returnKeyType = UIReturnKeyDone;
    eventTextField.keyboardAppearance  = UIKeyboardAppearanceDefault;//Showing leak at this line
    eventTextField.keyboardType = UIKeyboardTypeDefault;
    eventTextField.delegate=self;

我用dealloc方法釋放了它

在cellForRowIndex中，我將其添加為子視圖。

- (UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"MasterViewIdentifier"];
if (cell == nil) 
{
    cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:@"MasterViewIdentifier"] autorelease];
    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    UIView* elementView =  [[UIView alloc] initWithFrame:CGRectMake(20,170,320,280)];
    elementView.tag = 0;
    elementView.backgroundColor=[UIColor clearColor];
    [cell.contentView addSubview:elementView];
    [elementView release];
}
UIView* elementView  = [cell.contentView viewWithTag:0];
elementView.backgroundColor=[UIColor clearColor];
for(UIView* subView in elementView.subviews)
{
    [subView removeFromSuperview];
}
if(indexPath.section == 0 && indexPath.row == 0)
{
    CorkItAppDelegate* appDelegate = (CorkItAppDelegate*)[[UIApplication sharedApplication] delegate];
    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    wineNameTitleLabel.numberOfLines = 0;
    [wineNameTitleLabel setFont:[UIFont boldSystemFontOfSize:14]];

    if(appDelegate.isNewWine == YES)
    {
        wineNameTitleLabel.textColor = [UIColor blackColor] ;
        wineNameTitleLabel.text = appDelegate.getNewWineName;
    }
    else
    {
        if([event.eventWineName length]>0)
        {
            wineNameTitleLabel.textColor = [UIColor blackColor] ;
            wineNameTitleLabel.text = event.eventWineName;
        }
        else
        {
            wineNameTitleLabel.text = @"Wine Name";
        }
    }
        [elementView addSubview:wineNameTitleLabel];
}

else if(indexPath.section == 1)
{

    if(isRightButton == YES)
    {
        eventTextField.enabled = NO;
    }
    else
    {
        eventTextField.enabled = YES;
    }
    if([event.eventName length] > 0)
    {
        eventTextField.text = event.eventName;
    }
    else
    {
        eventTextField.text = @"";
    }
    [elementView addSubview:eventTextField];
    cell.accessoryType = UITableViewCellAccessoryNone;
}
       return cell;
 }

希望我能從您的身邊得到wucik的回應。 預先感謝Monish。

Answer 1

您應該在將UITextField添加到子視圖后釋放它

[foo addSubview:eventTextField];
[eventTextField release];

eventTextField = nil; 不需要的順便說一句，因為eventTextField是一個ivar已被清零（指針設置為0x0（nil））

Answer 2

如果您仍然需要eventTextField。 您應該為其創建一個屬性和實例變量。 這樣，您可以讓您的類擁有eventTextField並將其釋放到dealloc中。 像這樣：

@interface A {
  UITextField *eventTextField;
}

@property (nonatomic, retain) UITextField *eventTextField;

@end

@implementation A
@synthesize eventTextField;

- (id)init {
  eventTextField = [[UITextField alloc]init];
}

- (void)dealloc {
  [eventTextField release];
}
@end