应用程序崩溃时setBackButtonBackgroundImage

Question

我正在尝试使用以下代码全局设置UINavigationBar的外观：

[[UINavigationBar appearance] setBarStyle:UIBarStyleBlack];
[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"bg_daohang"] forBarMetrics:UIBarMetricsDefault];
[[UINavigationBar appearance] setBackButtonBackgroundImage:[UIImage imageNamed:@"btn_fanhui_1"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

我成功设置了barStyle和backGroundImage，但是当我设置backButtonBack（第三行）的外观时。应用程序崩溃，我收到如下错误：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[_UIAppearance     setBackButtonBackgroundImage:forState:barMetrics:]: unrecognized selector sent to instance 0x1dd7ea00'

如何全局正确设置backButtonBack的外观？

Answer 1

setBackButtonTitlePositionAdjustment:forBarMetrics:属于UIBarButtonItem。

使用：

[[UIBarButtonItem appearance] setBackButtonBackgroundImage:[UIImage imageNamed:@"btn_fanhui_1"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];