The Error I am getting is:
Cannot convert value of type '(NSError!) -> Void' to expected argument type '((Error?) -> Void)!
The code that is causing this error is
RevMobAds.startSessionWithAppID("<YOUR_APP_ID>",
withSuccessHandler: completionBlock,
andFailHandler: failureBlock)
Has anybody had this error when using RevMob before or have any ideas on how to fix? Thanks
The error that I am getting:
You are probably using the new Xcode and Swift 3.0. There have been a few changes on how Objective-C is converted to swift.
You only have to change the errorBlock code from what we have in our documentation to this:
let errorBlock: ((Error?) -> Void)! = {error in // <== only this line changed
// check the error
print(error)
}
and add the parameter name to the startSession call:
RevMobAds.startSession(withAppID: "<YOUR_APP_ID>", // only this line changed
withSuccessHandler: completionBlock,
andFailHandler: errorBlock);
Related
I created a promise which gets some data from API and returns it. Now what i am stuck is after getting the json data i need to store them on device storage (realm). After calling the promise when i try with then i get some error stating Cannot convert value of type '(Any) -> Void' to expected argument type '(_) -> _' . But when i try with done it works perfectly. But i need to use then to save the data on realm.
Following approch works fine
Translator().translators().done { data -> Void in
print(data[0].name)
}.catch { error in
print(error)
}
But following two approach fails
Translator().translators().then() { data -> Void in
print(data)
}.catch() {
(e: Error) in
print(e)
}
Above gives an error that says
Cannot convert value of type '(Any) -> Void' to expected argument type '(_) -> _'
and following approach gives another similar error
Translator().translators().then() {
(data: [Translator]) -> Void in
print(data[0].name)
}.catch() {
(e: Error) in
print(e)
}
error message:
Cannot convert value of type '([Translator]) -> Void' to expected argument type '([Translator]) -> _'
Promise i created:
func translators() -> Promise<[Translator]> {
return firstly {
Alamofire.request("http://192.168.0.107:3000/translatdors", method: .get).responseData()
}.map {
try JSONDecoder().decode([Translator].self, from: $0.data)
}
}
Image of my code and error
You have to return a promise when you do .then because until .done you are not finished. I don't see any issue in saving realm data in .done as your method has no return type.
Incase you still want to use .then, it can be done this way.
Translator().translators().then({ data -> Promise<[Translator]> in
return Promise.value(data)
}).done({ data in
// Save to realm
}).catch({ error in
print(error.localizedDescription)
})
In an iOS app using parse-server (on Heroku/mLab), I am having the following issue with a cloud function.
Here is the relevant code:
PFCloud.callFunction(inBackground: "myCloudFunction",
withParameters: ["lastTouch" : theLastTouchStamp]) {
(any: Any, error: Error) in
print("Now Inside Block (myCloudFunction)")
}
Here is the error message I get from the compiler:
Cannot convert value of type '(Any, Error) -> ()' to expected argument type 'PFIdResultBlock?'
I have browsed the net in search for some information, but eventhough I found a couple of related post; nothing led me to a solution.
Does anybody know how to solve this?
Remove the types from the closure:
PFCloud.callFunction(inBackground: "myCloudFunction", withParameters: ["lastTouch" : theLastTouchStamp]) {
(value, error) in
print("Now Inside Block (myCloudFunction)")
}
I converted my project to swift 3 and am having issue with the kinvey conversion. I had this before but it now gives me this error: "Cannot convert value of type '(AnyObject!, NSError!) -> Void' to expected argument type 'KCSCustomEndpointBlock!'". How could I fix this issue?
KCSCustomEndpoints.callEndpoint("endpointName", params: params, completionBlock: {
(results: AnyObject!, error: NSError!) -> Void in
if results != nil {
}
})
Mitch94,
This has been escalated to the engineering team for adding Swift 3 example of invoking custom endpoint to the Kinvey documentation.
I will get back to you once I have more information on it.
Thanks,
Pranav
Kinvey Support
I have working project in Xcode 7.3 with swift 2.2 version. Now I have updated Xcode 8 and migrated to swift 3. Now my project contains errors specially for blocks like success block of afnetworking.
Which gives error as
Cannot convert value of type '() -> ()' to expected argument type '((URLSessionDataTask, Any?) -> Void)?'
I don't understand how to solve this to work as per swift 3.
And there is also same like error in Facebook login.
Which gives error as
Cannot convert value of type '(FBSDKLoginManagerLoginResult!, NSError!) -> Void' to expected argument type 'FBSDKLoginManagerRequestTokenHandler!'
and
Cannot convert value of type '(_, _, NSError!) -> Void' to expected argument type 'FBSDKGraphRequestHandler!'
This all errors are related to handler blocks in swift 3. I don't understand the errors and so that can't able to solve. Any help will be appreciated. Thanks in advance.
For facebook - the problem is in new Swift rules about converting objective-c function parameters into Swift.
Previously, if parameters in objective-c code did not have nullability attributes(like nonnull or nullable), Swift converts it with ! making them non optional(forced unwrapping). Now it convert it with ? making them optional. That why you are getting an error. Before you were putting as a callback for login:
(FBSDKLoginManagerLoginResult!, NSError!) -> Void
Now you need to put:
(FBSDKLoginManagerLoginResult?, Error?) -> Void
Also, as you see, now you will not see NSError class. Instead of that Swift will put Error.This is also new rule. Now all "NS" prefixed in class names is removed in Swift(NSObject -> Object; NSError -> Error).
Example of working code for facebook login in Swift 3.0:
let manager = FBSDKLoginManager()
manager.logIn(withReadPermissions: ["public_profile"], from: self.controller) {
(loginResult: FBSDKLoginManagerLoginResult?, error: Error?) in
}
Example of working code for facebook request in Swift 3.0:
let request = FBSDKGraphRequest()
request.start {
(connection: FBSDKGraphRequestConnection?, result: Any?, error: Error?) in
}
As you see, now it is using Any type instead of objective-c id. In Swift 2.2 it was using AnyObject. It is also new Swift converting rule.
You do not need to specify callback parameters type. I did that in code for highlighting their real types. So you can just write code without them:
let manager = FBSDKLoginManager()
manager.logIn(withReadPermissions: ["public_profile"], from: self.controller) { (loginResult, error) in }
let request = FBSDKGraphRequest()
request.start { (connection, result, error) in }
But you need to remember that they are optional now.
In conclusion some converting rules that may affect you callback code:
Closure parameters are optional if in objective-c are not specified nullability attributes
All "NS" prefixes is removed for objective-c classes in Swift
If objective-c function had id parameter, in Swift 3.0 it will have type Any instead of AnyObject
Though I didn't know the error before that what Xcode want to inform me about the error, but I have removed type specification with object and it worked.
As
manager.post(methodname, parameters: param, progress: nil, success:{ (dataTask, responseObj) in
if let dict : NSDictionary = responseObj as? NSDictionary {
print("Response of \(methodname) : \(dict)")
if dict.object(forKey: "response") as? String == "success" {
CompletionHandler(true, dict)
} else {
CompletionHandler(false, dict)
}
}
})
Here with respect to question error is given at dataTask and responseObj which are with type specified. After removing type it worked fine.
Same as with facebook login
#IBAction func fbLoginClicked(_ sender: AnyObject) {
let app = UIApplication.shared.delegate as! AppDelegate
app.fbLoginManager = FBSDKLoginManager()
app.fbLoginManager.logOut()
app.fbLoginManager.loginBehavior = FBSDKLoginBehavior.native
app.fbLoginManager.logIn(withReadPermissions: ["email"], from: self, handler: { (result, error) -> Void in
if error != nil {
print(error?.localizedDescription)
} else {
if (result! as FBSDKLoginManagerLoginResult).isCancelled == true {
} else {
self.fetchFacebookUserDetail()
}
}
})
}
Here also I have removed type specification of result and error and problem solved. And followed this in whole app and it worked. I can run the project without error and also it is working. Thanks.
So I'm just trying to set up my new app with parse. I've downloaded their SDK and I've pasted my applicationID. The problem is in push notifications (which I didn't even touch). Can someone please help me?
Thanks
ERROR CODE:
PFPush.subscribeToChannelInBackground("") { (succeeded: Bool, error: NSError?) in
if succeeded {
print("ParseStarterProject successfully subscribed to push notifications on the broadcast channel.\n");
} else {
print("ParseStarterProject failed to subscribe to push notifications on the broadcast channel with error = %#.\n", error)
}
}
}
It says:
Cannot invoke 'subscribeToChannelInBackground' with an argument list
of type '(String, (Bool, NSError?) -> ())'
The code you are showing is to subscribe to notification channel...and it is complaining that it doesn't expect these arguments type.
To set up Parse SDK follow this: https://www.parse.com/apps/quickstart#parse_data/mobile/ios/swift/existing
from the parse getting started guide, this is how they tested the installation was good to go (swift)
let testObject = PFObject(className: "TestObject")
testObject["foo"] = "bar"
testObject.saveInBackgroundWithBlock { (success: Bool, error: NSError?) -> Void in
print("Object has been saved.")
}
Clearly the syntax of the function call is wrong. Follow the function (right click on the function in Xcode and "Jump to definition") to find out which arguments exactly the function expects. I don't know the SDK, but I guess the function takes two arguments - a string and a closure (block). Then you need to use that in your call instead of whatever you are using now.