iPhone SDK:如何将图像添加到UIBarButton? [英] iPhone SDK: How to add an image to a UIBarButton?

问题描述

我已使用下面的代码在导航栏上创建带有图像的按钮.

I have used the code below to create a button on the nav bar with an image.

我可以看到该图像，但也可以看到其周围的按钮边框.我的问题是，如何摆脱按钮边框.我只想看一下导航栏上的图像，没有边框.

I can see the image but I can also see the border of the button around it. My question is, how can I get rid of the button border. All I want to see is the image on the nav bar, no border.

UIBarButtonItem *settingsBtn = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"icon_prefs.png"] style:UIBarButtonItemStylePlain target:self action:@selector(openSettings:)];
[[self navigationItem] setLeftBarButtonItem:settingsBtn];
[settingsBtn release];

先谢谢了.任何指针，进一步阅读的链接或示例都值得赞赏.

Thanks in advance. Any pointers, links to read further or examples appreciated.

推荐答案

这是我当前项目之一的代码片段.它为UIBarButtonItem:

Here's a code fragment from one of my current projects. It loads an image with transparency for a UIBarButtonItem:

UIImage* image = [UIImage imageNamed:@"some-image.png"];
CGRect frame = CGRectMake(0, 0, image.size.width, image.size.height);
UIButton* someButton = [[UIButton alloc] initWithFrame:frame];
[someButton setBackgroundImage:image forState:UIControlStateNormal];
[someButton setShowsTouchWhenHighlighted:YES];
UIBarButtonItem* someBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:someButton];
[self.navigationItem setRightBarButtonItem:someBarButtonItem];
[someBarButtonItem release];
[someButton release];

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