It's an unfortunate limitation of id-as-Any that we can't dynamically bridge ObjC blocks back and forth between closures if we don't statically know that the elements are closures at compile time. You can make the dictionary have [String: PSPDFRenderDrawBlock] type instead of [String: Any] type, or if it needs to be Any, assign explicitly @convention(block) values into it as you noted.

Is it possible, in any way to import ObjC block type as @convention(block) automatically without declaring additional type?

@belkadan might be a better person to answer that question.

Hm, not at the moment, but it fits into some existing requests we have not to bridge classes to values. I'll keep this in mind.

Comment by Hovhannes (JIRA)

for this header:

```

#import <Foundation/Foundation.h>

typedef void (^ExperimentBlock)(void);

NS_ASSUME_NONNULL_BEGIN

@interface MyClass : NSObject

+ (void)f:(NSDictionary<NSString *, ExperimentBlock> *)experimentVariant;

@EnD

NS_ASSUME_NONNULL_END

```

generated swift code is:

```

import Foundation

public typealias ExperimentBlock = () -> Void

open class MyClass : NSObject {

open class func f(experimentVariant: \[String : @convention(block) () -\> Void\])

}

```

f function swift version is not accepting `ExperimentBlock` .

Is there a way to fix it?