Cordova Plugin File Transfer - CDVFileTransfer.m:107:49: No known instance method for selector 'userAgent' - Swift

Introduction

Cordova Plugin File Transfer is a plugin that allows you to transfer files to and from a server using Cordova/Phonegap. However, you may encounter an error message that says "CDVFileTransfer.m:107:49: No known instance method for selector 'userAgent'". This error message occurs when you try to access the userAgent property which does not exist in the current version of the plugin.

In this article, we will discuss why this error message occurs and how to resolve it.

Why this error message occurs

This error message occurs when you try to call a property or method that does not exist in the current version of Cordova Plugin File Transfer. The userAgent property was removed in a recent update of the plugin, which is why you may encounter this error message.

How to resolve this error message

To resolve the "No known instance method for selector 'userAgent'" error message, you will need to update your code to use an alternative method. The userAgent property was removed in version 1.7.0 of the plugin, so you can use the setValue:forHTTPHeaderField: method to set the user agent header instead.

Here is an example of how to set the user agent header using the setValue:forHTTPHeaderField: method:

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://example.com"]];
[request setValue:@"My User Agent" forHTTPHeaderField:@"User-Agent"];

In the above code, we create a new NSMutableURLRequest object and set the NSURL to the URL we want to request. We then use the setValue:forHTTPHeaderField: method to set the user agent header to "My User Agent".

With this change, you should no longer encounter the "No known instance method for selector 'userAgent'" error message.

Conclusion

In conclusion, we have discussed why the "No known instance method for selector 'userAgent'" error message occurs in Cordova Plugin File Transfer and how to resolve it. By using the setValue:forHTTPHeaderField: method to set the user agent header, you can avoid this error message and ensure that your code is up to date with the latest version of the plugin.