I am attempting to use the autogenerated Swift bridging header in an Objective-C class, but when I try to include it, I get many errors in the bridging header. Since the header is automatically generated, its not at all clear what I might have wrong.
In an Objective-C class, if I declare the following line I will get build errors - without this line, no errors and it builds fine:
#import "Oilist-Swift.h"
EDIT: I just moved the #import "Oilist-Swift.h" statement to after all the other headers have been imported, and now I only get errors relating to MFMailComposeViewControllerDelegate and possibly one error relating to PopupStoreControllerDelegate. Here are all the errors now:
Angle brackets contain both a protocol ('PopupStoreControllerDelegate') and a type ('MFMailComposeViewControllerDelegate')
Unknown class name 'MFMailComposeViewControllerDelegate'; did you mean 'MFMailComposeViewController'?
Replace 'MFMailComposeViewControllerDelegate' with 'MFMailComposeViewController'
- (void)mailComposeController:(MFMailComposeViewController * _Nonnull)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError * _Nullable)error;
Expected a type (MFMailComposeResult)
I've looked for circular references and can't find any so far.
Any insights would be greatly appreciated!
Seems really close now - it seems its just not happy with MFMail for some unknown reason.
If I import MessageUI.h it works now. (Despite MessageUI not being used at all in the class importing the Swift header).
I guess I have to import MessageUI because it is referenced in the bridging header and doesn't include a definition for the MessageUI stuff...
Solution:
#import <MessageUI/MessageUI.h>
#import "Oilist-Swift.h"
Related
I am creating Swift framework in which I have to use Objective-C class. So I went through this link. This is the public header of my framework :
#import <UIKit/UIKit.h>
//! Project version number for Test.
FOUNDATION_EXPORT double TestVersionNumber;
//! Project version string for Test.
FOUNDATION_EXPORT const unsigned char TestVersionString[];
// In this header, you should import all the public headers of your framework using statements like #import <Test/PublicHeader.h>
#import <arpa/inet.h>
#import <ifaddrs.h>
#import <netdb.h>
#import <sys/socket.h>
#import <MyTest/MPAppDelegateProxy.h>
Now in class MPAppDelegateProxy, I have to use a Swift class which I have created. This is :
#import "MPAppDelegateProxy.h"
#import "MyTest.h"
#implementation MPAppDelegateProxy
+ (void)proxyAppDelegate {
[MPGlobal MPLog:#"App delegate not set, unable to perform automatic setup." file:#"MPAppDelegateProxy.m" function:#"proxyAppDelegate" line:32];
// rest of code
}
MPGlobal is one of my Swift class. But I am getting :
Use of undeclared identifier 'MPGlobal'
Note : I have added #objC before MPGlobal.
You need to import <Target>-Swift.h file.
This is known as Objective-C Generated Interface Header Name.
You can find it in your Target's build settings.
This file is auto generated by compiler and it needs to be imported in Objective-C files.
change the SWIFT_OBJC_INTERFACE_HEADER_NAME build setting and making it the same across different targets. To do so change the instruction that generates this property from $(SWIFT_MODULE_NAME)-Swift.h to $(PROJECT_NAME)-Swift.h as explained here
After doing this Clean Build Folder by pressing Alt and going into Product menu. Since name of header is shared among targets now it can be imported once in the .m ObjectiveC file and all targets can benefit from Swift classes.
If after building it still shows the error, ensure that the header can be reached from XCode by Cmd clicking on its name. It should open a file that contains code similar to this:
SWIFT_CLASS("_TtC27ProjectName_Summary11MyClass")
#interface MyClass : NSObject
- (nonnull instancetype)init OBJC_DESIGNATED_INITIALIZER;
#end
If need to ensure that those headers are being generated open a terminal and use this command
find ~/Library/Developer/Xcode/DerivedData -name "*Swift.h"
You should see one header for each target
Another issue that happened to me after those changes is that it started giving errors on ObjectiveC code that I didn't touch. The problem was due to the position of the import, as reported here:
Exactly where at the top of a .m file you #import the hidden bridging
header can make a difference. The usual sign of trouble is that you
get an “Unknown type name” compile error, where the unknown type is a
class declared in Objective-C. The solution is to #import the .h file
containing the declaration for the unknown type in your Objective-C
files as well, before you #import the hidden bridging header. Having
to do this can be an annoyance, especially if the Objective-C file in
question has no need to know about this class, but it resolves the
issue and allows compilation to proceed.
At the very end the code compiles and runs on device and simulator!
Original answer
Also you can try this,
You needed to import the -Swift.h for for both the framework and the app target
For Example :
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <Foundation/Foundation.h>
#import "XLPagerTabStrip-Swift.h"
#import "RealmSwift-Swift.h"
...... // Add all frameworks, subclasses, and dependance ios frameworks
#import "MyProject-Swift.h"
You can read this article How to import file header and check paths
I am working on a project where the code is in Objective-C & Swift 3.2,
I am sending mail from Swift file where I need to extend MFMailViewControllerDelgate
but when I Build project I get an error
Can not find protocol declaration for 'MFMailComposeViewControllerDelegate'
at Swift Header file
in below code part
#interface EmailManager (SWIFT_EXTENSION("targetname"))
<MFMailComposeViewControllerDelegate>
- (void)mailComposeController:(MFMailComposeViewController *
_Nonnull)controller didFinishWithResult:(MFMailComposeResult)result
error:(NSError * _Nullable)error;
#end
To resolve error I edit swift header file & add Manually <MessageUI/MessageUI.h>
And everything works fine.
but When new changes are made in Project or ad new Swift file this auto-generated file get reset & I get an error again.
please suggest some permanent solution
FYI:
In Auto generate file there is #import MessageUI
In Build Setting there is MessageUI in Framework
In Build Setting Define Modules set to YES
ignore target name in the code snippet
I have a new Swift project with a few files, I've needed to add some Objc code.
In Build Settings, my Objective-C Generated Interface Header Name is MyProject-Swift.h
Product Module Name and Product Name are both MyProject.
My Objective-C Bridging Header is MyProject/MyProject-Bridging-Header.h
The contents of my Bridging Header are:
#ifndef MyProject_Bridging_Header_h
#define MyProject_Bridging_Header_h
#import "Blakey.h"
#endif
Blakey.h is pretty simple:
#import Foundation;
#import "MyProject-Swift.h"
#class KeyPair;
#interface Blakey: NSObject
- (void)createKeyPairForSeed:(NSString *)seed;
#end
And Blakey.m
#import <Foundation/Foundation.h>
#import "Blakey.h"
#implementation Blakey
- (void)createKeyPairForSeed:(NSString *)seed;
{
}
#end
(side note: I'm aware my function returns a void, that will be changed later once this issue is fixed so it returns an actual value)
Why is Xcode throwing an error at the #import "MyProject-Swift.h" in Blakey.h?
Project-Swift.h is a file auto generated by Xcode on successful compilation of the project. Catch here is the word successful compilation If your project has any compilation error Project-Swift.h file will not be generated. So in a way it becomes a deadlock. Bestway comment out all the lines that have compilation error and then manage to get it compile without any errors. Only after that Project-Swift.h will be generated.
Additional information, Once the Project-Swift.h file is generated if you open it and if you happened to see that your swift class is not imported there thats because Project-Swift.h imports only the classes that extends from NSObject So plain Swift classes will not be imported.
ISSUE:
You need to import Project-Swift.h in .m file and not .h file. So modify your Blakey as
#import <Foundation/Foundation.h>
#import "Blakey.h"
#import "MyProject-Swift.h"
#implementation Blakey
- (void)createKeyPairForSeed:(NSString *)seed;
{
}
Finally remove #import "MyProject-Swift.h" from Blakey.h
#import Foundation;
#class KeyPair;
#interface Blakey: NSObject
- (void)createKeyPairForSeed:(NSString *)seed;
#end
I had similar issue and almost ended up spending a whole day trying to figure out what wrong with my app.
So following the solution that's helped me :
Clear derived data
Create a class in swift with prefix of #objc for example #objc class mySwiftClass{...}
Build the project again
Et voila.. Should work now.
Why to add #objc?
this #objc prefix, tells the compiler to generate to your swift class a header file. it will add it to the "MyModule-Swift.h" file
I realize this is an old thread, but I had similar issues after adding a new target to a project. I solved it by adding a preprocessor macro (Build Settings -> Apple Clang - Preprocessing) only in said target and then importing the Swift.h file conditionally, like this:
#if DEV_VERSION
#import "Project_DEV-Swift.h"
#else
#import "Project-Swift.h"
#endif
My main target is called Project and the new target is Project DEV (the space is replaced with an underscore in the import), and the preprocessor macro is called DEV_VERSION.
After doing this, both targets build just fine.
<product_name>-Swift.h file not found
It is a kind of bridge(adapter) between Swift and Objective-C. This file contains Swift's API for Objective-C which was marked [#objc and #objcMembers].
You can work with types declared in Swift from within the Objective-C code in your project by importing an Xcode-generated header file.
The header's name is generated from a <product_name>-Swift.h
[Mixing Objective-C and Swift ]
I had a similar issue whereby it would have this issue for anything other than live.
I resolved the issue by hardcoding "Product module name" & "Product name" to my project name. This avoids the need to have preprocessor logic in every file that includes swift code as demonstrated in Pauli Kettunen's solution.
I want to use my protocol method of swift class into objective-c class for it I have to import 'ProductModuleName-Swift.h' and declare its protocol in interface but it shows error: 'ProductModuleName-Swift.h' file not found.
But when I import it into test.m file then its fine but when I import it into test.h then it shows the error.
example:
test.h
#import "myProject-Swift.h"
#interface test : UIViewController<mySwiftDelegate>
or There is any way to use protocol method of swift in obj-c class
thanks in advance.
Go to Targets -> Build Settings -> Swift Compiler - Code Generation and make sure the "Objective-C Bridging Header" points to the correct place and the "Objective-C Generated Interface Header Name" is the correct file. My header name for the unit tests defaulted to Module-NameTest-swift.h I needed to remove "Test" from the title.
I'm getting this really weird error when trying to import UIKit in my swift file.
My Code is simply:
import UIKit
class Test: NSObject {
}
The error I get at 'import UIKit' is:
Unknown type name 'import'
Expected ';' after top level declarator
I have added UIKit to my Frameworks folder, the class doesn't contain any code (so therefore there shouldn't be anything wrong with it) and I tried to restart both xCode and my Mac, but the error is still there.
I appreciate any help.
Thanks.
EDIT:
Solved:
I tried to import 'Test.swift' in AppDelegate.
This problem usually happens when you try to import ".swift" file in your Objective-C code, like this: #import "HomeViewController.swift". This is wrong and you should import special, automatically generated Swift header, instead:
#import "ProductModuleName-Swift.h"
where ProductModuleName is the name of your module (or project) containing the Swift code.
Found good Trouble shooting guide - there is great Troubleshooting Tips and Reminders section!
https://developer.apple.com/library/ios/documentation/Swift/Conceptual/BuildingCocoaApps/MixandMatch.html#//apple_ref/doc/uid/TP40014216-CH10-XID_87
The import stuff in swift is case sensitive. Example :
import uikit
will not work. You'll have to type it as
import UIKit
In my case, it was because somehow the selected type in the file inspector was objective-c source instead of Default - Swift Source even though i was using a .swift file.
Changing it to Default - Swift Source solved the issue for me.