AHTabBarController与Swift不兼容

Question

我想在swift项目中使用“AHTabBarController”。

我不知道为什么这个代码不工作：

 var tabBarController = self.window?.rootViewController as AHTabBarController 

     var tab1 = AHTabView() 
     tab1.image = UIImage(named: "") 
     tab1.title = "Tab 1" 

     var tab1_subItem = AHSubitemView(frame: UIScreen.mainScreen().bounds) 
     tab1_subItem.image = UIImage(named: "") 
     tab1_subItem.title = "Tab 1 Title" 
     tab1_subItem.viewControllerIdentifier = "channelsListSB" 

     tab1.addSubitem(tab1_subItem) 


     tabBarController.tabs.addObjectsFromArray([tab1]) 

     self.window?.rootViewController = tabBarController 

Objective-C的代码是：

AHTabBarController *tabBarController = (AHTabBarController*)self.window.rootViewController; 

/******* PURUS *******/ 
AHTabView *purus = [AHTabView new]; 
[purus setImage:[UIImage imageNamed:@"persondot"]]; 
[purus setTitle:@"Purus"]; 

AHSubitemView *pFirst = [AHSubitemView new]; 
[pFirst setImage:[UIImage imageNamed:@"persondot"]]; 
[pFirst setTitle:@"First"]; 
[pFirst setViewControllerIdentifier:@"PurusFirst"]; 
[purus addSubitem:pFirst]; 

// … 

AHSubitemView *fFirst = [AHSubitemView new]; 
[fFirst setImage:[UIImage imageNamed:@"photos"]]; 
[fFirst setTitle:@"First"]; 
[fFirst setViewControllerIdentifier:@"FringillaFirst"]; 
[fringilla addSubitem:fFirst]; 
//Don't forget to add your AHTabView instances to the AHTabBarController! 
[tabBarController.tabs addObjectsFromArray:@[purus, fringilla, ipsum]]; 

的错误是：

fatal error: unexpectedly found nil while unwrapping an Optional value

Answer 1

你不要指定一条线，所以我只是猜测问题在这里：

tab1.image = UIImage(named: "") 

这是返回nil，但您将它分配给image，这是一个隐式解包可选。您需要指定一个确保返回图像的实际图像名称。或者，你可以有条件地这样做：

if let image = UIImage(named: "") { 
    tab1.image = image 
} else { 
    // handle failure 
}