相关疑难解决方法(0)

我得到以下代码:

- (id)init {
  if (self = [super init]) {
      self.title = @"please wait";
      UIBarButtonItem *favorite = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"star.png"] style:UIBarButtonItemStylePlain target:self action:@selector(buttonFavoriteClicked:)];
      self.navigationItem.rightBarButtonItem = favorite;
  }

  return self;
}

但我的按钮看起来仍像一个带有UIBarButtonItemStyleBordered替换文字的按钮 http://img693.imageshack.us/img693/1632/bildschirmfoto20100227ui.png

有没有办法在这个位置设置一个朴素的按钮？