如何设置普通UIBarButtonItem的背景图像？

Question

如果我的UIBarButtonItem（lightButton）具有Bordered样式，则以下任一行都会更改背景图像：

[lightButton setBackgroundImage:resizeableImage forState:UIControlStateNormal style:UIBarButtonItemStyleBordered barMetrics:UIBarMetricsDefault];
[lightButton setBackgroundImage:resizeableImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

如果按钮的样式为Plain，则以下两行均不会更改背景图像：

[lightButton setBackgroundImage:resizeableImage forState:UIControlStateNormal style:UIBarButtonItemStylePlain barMetrics:UIBarMetricsDefault];
[lightButton setBackgroundImage:resizeableImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

除了使用initWithCustomView:之外，是否可以更改Plain UIBarButtonItem的背景图像？

Answer 1

你可以使用它。

UIButton *modalViewButton = [UIButton buttonWithType:UIButtonTypeCustom];
UIImage* imagex = [UIImage imageNamed:@"xxxx.png"];
[modalViewButton addTarget:self action:sel forControlEvents:UIControlEventTouchUpInside];
[modalViewButton setImage:btnImage forState:UIControlStateNormal];
//modalViewButton setBackImage......
[modalViewButton setFrame:CGRectMake(0, 0, imagex.size.width, imagex.size.height)];
UIBarButtonItem *modalBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:modalViewButton];