I have swift method which adds a block in Dictionary and when i get the block in other swift class i am getting the block addes and it works fine. But when i try to get the block from the dictionary in Objective C it returns Nil.
If i pass the block as parameter in a method then it work fine in Objective C.
Sample Code.
Objective C Methods
-(void)workingCodeMethod:(void (^)(void))completionHandler {
if (completionHandler) {
completionHandler();
}
}
-(void)crashCodeMethod:(NSDictionary *)loginData {
void (^completionHandler)(void) = [loginData objectForKey:@"callback"];
if (completionHandler) {
completionHandler();
}
}
Swift Methods
@IBAction func workingCodeAction(_ sender: Any) {
// Block in Dictionary is passed to Objective C class.
viewController?.crashCodeMethod(getAuthorizationData())
}
@IBAction func crashCodeAction(_ sender: Any) {
viewController?.workingCodeMethod({
print("Its working")
})
}
// Block is added in Dictionary.
private func getAuthorizationData() -> [String: Any] {
var data: [String: AnyObject] = [String: AnyObject]()
data["callback"] = {
print("Its crashing")
} as AnyObject
return data
}
When you cast Swift closure to AnyObject directly, Swift does not make an Objective-C block.
Try something like this:
private func getAuthorizationData() -> [String: Any] {
var data: [String: AnyObject] = [String: AnyObject]()
data["callback"] = {
print("Its NOT crashing")
} as (@convention(block) ()->Void) as AnyObject
return data
}