相关疑难解决方法(0)

我正在创建一个UIBarButtonItem并将其添加到我的导航栏,如下所示:

(void)viewDidLoad { 

   ...

   // Add the refresh button to the navigation bar
   UIButton *refreshButton = [UIButton buttonWithType:UIButtonTypeCustom];
   [refreshButton setFrame:CGRectMake(0,0,30,30)];
   [refreshButton setImage:[UIImage imageNamed:@"G_refresh_icon.png"] forState:UIControlStateNormal];
   [refreshButton addTarget:self action:@selector(refreshData) forControlEvents:UIControlEventTouchUpInside];
   UIBarButtonItem *refreshBarButton = [[[UIBarButtonItem alloc] initWithCustomView:refreshButton] autorelease];
   self.navigationItem.leftBarButtonItem = refreshBarButton;
}

它在我运行时看起来是正确的,但我可以通过点击导航栏从x = 0到大约100来选择条形按钮项目.如何调整可选区域的宽度为30像素？