像Apple的iPad Mail App一样显示UIBarButtonItem

Question

Apple的iPad 邮件应用程序在 navigationItem 的 setRightBarButtonItems 区域中显示了一些 embedded 的图标拆分视图控制器的详细视图：

如何将这样的图标添加到navigationItem栏（我已经有了图标）。

我的问题是UIBarButtonItem类引用似乎没有适当的UIBarButtonItemStyle，它允许按钮周围没有边框。我已经尝试通过initWithCustomView配置UIBarButtonItem但是点击该按钮不起作用。

提前感谢任何建议

干杯

编辑：我可以使用UIBarButtonItemStylePlain，但它看起来不像苹果按钮那样“嵌入”，这就是我追求的外观。

Answer 1

我已经解决了，可以产生以下结果：

这是我使用的代码。它可以进行优化，但是为了演示目的，它是好的和重复的：

- (void)setupNavigationItemButtons {

float buttonWidth = 60;
float buttonHeight = 40;

UIImage *imageA = [UIImage imageNamed:@"212-action2.png"]; 
UIImage *imageB = [UIImage imageNamed:@"111-user.png"];
UIImage *imageC = [UIImage imageNamed:@"122-stats.png"];

UIButton *buttonA = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, buttonWidth, buttonHeight)];
UIButton *buttonB = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, buttonWidth, buttonHeight)];
UIButton *buttonC = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, buttonWidth, buttonHeight)];

[buttonA addTarget:self action:@selector(doSomething:)      forControlEvents:UIControlEventTouchUpInside];
[buttonB addTarget:self action:@selector(doSomethingElse:)  forControlEvents:UIControlEventTouchUpInside];
[buttonC addTarget:self action:@selector(doSomethingRandom:)forControlEvents:UIControlEventTouchUpInside];

[buttonA setImage:imageA forState:UIControlStateNormal];
[buttonB setImage:imageB forState:UIControlStateNormal];
[buttonC setImage:imageC forState:UIControlStateNormal];

UIBarButtonItem *buttonItemA = [[UIBarButtonItem alloc] initWithCustomView:buttonA];
UIBarButtonItem *buttonItemB = [[UIBarButtonItem alloc] initWithCustomView:buttonB];
UIBarButtonItem *buttonItemC = [[UIBarButtonItem alloc] initWithCustomView:buttonC];

[self.navigationItem setRightBarButtonItems:[NSArray arrayWithObjects:buttonItemA, buttonItemB, buttonItemC,nil]];

}