iphone - 更改 UIBarButtonItem UIButton 的图像

Question

我有一个 UIBarButtonItem ，它带有一个带有图像的 UIbutton 的自定义 View ，我希望有一个不同的 UIImage 用于不同的方向，所以这是我的代码:

 UIButton * backButton = (UIButton *) ((UIBarButtonItem *) self.navBar_.topItem.leftBarButtonItem).customView;
        if (UIInterfaceOrientationIsLandscape([[UIApplication sharedApplication] statusBarOrientation]) && IS_IPAD) {        
            [backButton setBackgroundImage:[UIImage imageNamed:@"back-landscape.png"] forState:UIControlStateNormal];  
            [backButton setFrame: CGRectMake(0, 0, 46, 35)]; 
        } else {
            [backButton setBackgroundImage:[UIImage imageNamed:@"back-reading.png"] forState:UIControlStateNormal];  
            [backButton setFrame: CGRectMake(0, 0, 23, 19)]; 
        }

但是，这不会改变 UIButton 图像，这是为什么呢？

Answer 1

试试这个:-

UIButton * backButton ;
if (UIInterfaceOrientationIsLandscape([[UIApplication sharedApplication] statusBarOrientation]) && IS_IPAD) 
{ 
    backButton = [[UIButton alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 66.0f, 36.0f)];       
    [backButton setImage:[UIImage imageNamed:@"back-landscape.png"] forState:UIControlStateNormal];  

} 
else 
{
    backButton = [[UIButton alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 23, 19)];     
    [backButton setImage:[UIImage imageNamed:@"back-reading.png"] forState:UIControlStateNormal];  
    [backButton setFrame: CGRectMake(0, 0, 23, 19)]; 
}

[backButton addTarget:self action:@selector(goToHome) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *HomeButton = [[UIBarButtonItem alloc] initWithCustomView: backButton];
[self.navigationItem setLeftBarButtonItem:HomeButton];