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去除 NavigationBar 下面的黑线

if ([self.navigationController.navigationBar respondsToSelector:@selector( setBackgroundImage:forBarMetrics:)]){
        
        NSArray *list=self.navigationController.navigationBar.subviews;
        
        for (id obj in list) {
            
            if ([obj isKindOfClass:[UIImageView class]]) {
                
                UIImageView *imageView=(UIImageView *)obj;
                
                NSArray *list2=imageView.subviews;
                
                for (id obj2 in list2) {
                    
                    if ([obj2 isKindOfClass:[UIImageView class]]) {
                        
                        UIImageView *imageView2=(UIImageView *)obj2;
                        
                        imageView2.hidden=YES;
                        
                    }
                    
                }
                
            }
            
        }
        
    }