ios - 自定义iOS6中的导航栏按钮

更新-一种可能的解决方案
根据Alexander Merchi在这篇文章(UIBarButtonItem Custom view in UINavigationBar)中给出的答案，找到了一个解决方案。但是仍然不知道如何正确更改图像的位置。

UIButton *btn =  [UIButton buttonWithType:UIButtonTypeCustom];
        [btn setFrame:CGRectMake(0, 0, 28.0f, 28.0f)]; // 28 points is the width or height of the button image
        [btn setBackgroundImage:[UIImage imageNamed:@"button.png"] forState:UIControlStateNormal];
        [btn addTarget:self action:@selector(onClickMenuButton) forControlEvents:UIControlEventTouchUpInside];
        btnMenu = [[UIBarButtonItem alloc] initWithCustomView:btn];

原始帖子
在iOS 6中，目标是这样的:

而当前结果是这样的:

我的代码是

btnMenu = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"button.png"]
                                           style:UIBarButtonItemStylePlain
                                          target:self
                                          action:@selector(onClickMenuButton)];

button.png是一个白色圆圈，里面带有白色的三个横条，背景为透明。

最佳答案

UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeCustom];
rightButton.frame = CGRectMake(0, 0, 30, 30);
[rightButton setImage:[UIImage imageNamed:@"Button-normal"] forState:UIControlStateNormal];
[rightButton setImage:[UIImage imageNamed:@"logout-hover"] forState:UIControlStateHighlighted];
[rightButton addTarget:self action:@selector(logOut) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:rightButton];
self.navigationItem.leftBarButtonItem = rightBarButtonItem;