ios7 tableViewCell 图片显示不居中

@interface MyProfileViewCell : UITableViewCell

@end

@implementation MyProfileViewCell

- (void)layoutSubviews
{
    [super layoutSubviews];
    CGRect frame = self.imageView.frame;
    CGFloat y = frame.origin.y;
    y += 1;
    frame.origin.y = y;
    self.imageView.frame = frame;
}

@end