相关疑难解决方法(0)

这是快照:

代码在这里:

UIButton *leftButton = [UIButton buttonWithType:UIButtonTypeCustom];
leftButton.frame = CGRectMake(0.0f, 0.0f, 46.0f, 32.0f);
[leftButton setBackgroundImage:[UIImage imageNamed:@"navi_register_up.png"] forState:UIControlStateNormal];
[leftButton addTarget:self action:@selector(doRegister) forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *leftBarItem = [[UIBarButtonItem alloc] initWithCustomView:leftButton];
self.navigationItem.leftBarButtonItem = leftBarItem;
[leftBarItem release];

有没有办法将按钮向上移动一些px？谢谢:)