设置NavigationBar的背景为透明

In Objective-C

 

[self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];

    self.navigationController.navigationBar.shadowImage = [UIImage new];

    self.navigationController.navigationBar.translucent = YES;

 

 

In swift 3 (iOS 10)

 

1. self.navigationBar.setBackgroundImage(UIImage(), for: .default)  
2. self.navigationBar.shadowImage = UIImage()  
3. self.navigationBar.isTranslucent = true  

 

In swift 2

 

1. self.navigationBar.setBackgroundImage(UIImage(), forBarMetrics: .Default)  
2. self.navigationBar.shadowImage = UIImage()  
3. self.navigationBar.translucent = true