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iphone - 用于后退按钮的自定义UIBarButtonItem

我想在导航栏中使用自定义项目作为后退按钮.

UIImage *backButtonImage = [UIImage imageNamed:@"backbutton.png"];
UIBarButtonItem *customItem = [[UIBarButtonItem alloc] initWithImage:backButtonImage style:UIBarButtonItemStylePlain target:nil action:nil];
[self.navigationItem setBackBarButtonItem: customItem];
[customItem release];

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我最终得到的是我周围有边框的图像.它看起来像这样(我的图像是后退按钮):

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