How can I center image in custom cell

In my custom cel开发者_开发百科l I want to center an image but this does not work.

    self.leftImage = [[[UIImageView alloc] initWithImage:cry] autorelease] ;
    float h=cell.frame.size.height;
    float w=cell.frame.size.width;

    CGRect r = leftImage.frame;
    r.origin = cell.frame.origin;
    r.origin.x = w/ 2  - r.size.width / 2;
    r.origin.y = h / 2  - r.size.height / 2 + 12;
    leftImage.frame = r;
            [self.contentView addSubview:leftImage];

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I think You tried to do this in - (UITableViewCell *)tableView:(UITableView *)tableViewRef cellForRowAtIndexPath:(NSIndexPath *)indexPath when creating new cell or in cell itself in init section. At this moments cell don't have correct frame and you can't rely on it.

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Try setting the leftImage's autoresizingMask:

self.leftImage.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleBottomMargin

When the cell is created, you're never sure what its dimensions are. Mostly, a cell will be initialized with a CGRectZero frame and later on, the UITableView will resize the cell appropriately.