透明UIToolBar与不透明的UIBarButtonItem

Question

我有一个透明的UIToolbar通过设置半透明真实和改变背景alpha。我怎样才能使工具栏按钮不透明？我尝试添加非透明的形象是这样的：

CGRect rect = CGRectMake(0, 0, ([AppDelegate isInIPad])?768:320, 20); 
UIGraphicsBeginImageContext(rect.size); 
CGContextRef context = UIGraphicsGetCurrentContext(); 
CGContextSetFillColorWithColor(context, [[UIColor redColor] CGColor]); 
CGContextFillRect(context, rect); 

UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); 
UIGraphicsEndImageContext(); 

[self.filterButton setBackgroundImage:image forToolbarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault]; 

Answer 1

试试这个：

[yourToolbar setBackgroundImage:[UIImage new] forToolbarPosition:UIToolbarPositionAny barMetrics:UIBarMetricsDefault];  
[yourToolbar setBackgroundColor:[UIColor clearColor]];  
[yourToolbar setShadowImage:[UIImage new] forToolbarPosition:UIToolbarPositionAny];