如何将Objective-c中的数据类型与Swift协议匹配？

Question

Trying to port Objective-c code to Swift and I'm pretty new to Swift. I added bridging header and included all the necessary headers to it. In my Swift class I need to use the following protocol below:

@protocol MyProtocolDelegate

- (void)doSomeStuff:(NSDictionary *)stuff;

@end

In my Swift class I have the following code:

func doSomeStuff(stuff:Dictionary<String,String>)
{
...
}

I get an error here:

class ViewController: UIViewController,MyProtocolDelegate  <-- Type ViewController doesn't conform to protocol MyProtocolDelegate

Any ideas why I'm getting this error?

Any kind of help is highly appreciated!

Answer 1

As you've discovered, a plain NSDictionary * is bridged to [NSObject: AnyObject]! .

To get Dictionary<String,String> , you would have to declare it in Objective-C as

- (void)doSomeStuff:(nonnull NSDictionary<NSString *, NSString *> *)stuff;

Answer 2

func doSomeStuff(stuff: NSDictionary)

如果不想，则无需指定类型。