I am trying to follow a tutorial for using a stylesheet from Nick Kuh's book "iPhone App Development". The stylesheet header file is throwing:
"Expected a type"
errors which I think normally reflects a circular problem. However, in this case the only import is to Foundation.h. (The implementation file, btw, does not throw any errors and seems to be fine.) Here is the header file in its entirety.
#import <Foundation/Foundation.h>
typedef enum : int {
IDLabelTypeName = 0,
IDLabelTypeBirthdayDate,
IDLabelTypeDaysUntilBirthday,
IDLabelTypeDaysUntilBirthdaySubText,
IDLabelTypeLarge
}
IDLabelType;
#interface IDStyleSheet : NSObject
+(void)initStyles;
+(void)styleLabel:(UILabel *)label withType:(IDLabelType)labelType;//throws red error
+(void)styleTextView:(UITextView *)textView;//throws red error
+(void)styleRoundCorneredView:(UIView *)view;//throws red error
#end
Can anyone see why these errors are occurring?
UILabel, UITextView ... are defined in the UIKit framework, therefore you have to
#import <UIKit/UIKit.h>
(which then implicitly imports Foundation). You can also use the
more modern "module" syntax:
#import UIKit;
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 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'm trying to build and test an app with the xcode simulator, but during the building I get errors in ACAccount.h, ACAccountType.h, etc.
The "strange thing" (at least for me as i'm completely new in using xcode) is that if I click on the .h files with errors they do not appear under the project code but under
Simulator - iOS 7.1-> Frameworks -> Accounts -> ACAccount.h
which is unmodifiable.
Examples of the errors are:
line:
#class ACAccountType,ACAccount Credential; --> Illegal interface qualifier
ACCOUNTS_CLASS_AVAILABLE(NA, 5_0)
#interface ACAccount : NSObject -->Objective-C declarations may only appear in global scope
If the .h are predefined files.. How can I solve these errors?
Many thanks in advance!
Generally when you encounter items like the 'illegal interface qualifier' in system provided headers it indicates that you've placed the #import statement within an #interface block, like:
#interface foo ()
#import <Accounts/ACAccount.h>
#end
This generates errors about the content in the file being imported (e.g. your illegal interface qualifier error), while the actual issue is that putting #import statements within an #interface block is invalid.
You should put #import statements together at the top of the file, outside of any #interface or #implementation blocks.
If you put it into the #implementation section, the error becomes:
error: Objective-C declarations may only appear in global scope
I'm trying to use Novocaine in an iPhone application I'm building. I can't figure out how to get around this error I'm getting:
Unknown type name 'RingBuffer'
Here's my file structure:
...with those files under Novocaine being the ones pulled from the Github repo for Novocaine. Here's my header file for DDViewController.
#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
#import "UICoordButton.h"
#import "Novocaine.h"
#import "RingBuffer.h"
#import "AudioFileReader.h"
#import "AudioFileWriter.h"
#interface DDViewController : UIViewController
{
RingBuffer *ringBuffer;
Novocaine *audioManager;
AudioFileReader *fileReader;
AudioFileWriter *fileWriter;
}
- (IBAction)changeColor:(id)sender;
- (IBAction)changeColor2:(id)sender;
#end
I've tried a solution that I found on another question, which suggests that this should work:
#class RingBuffer;
#interface DDViewController : UIViewController
{
...
But that just gives me Redefinition of 'RingBuffer' as a different kind of symbol.
How can I fix this problem and use RingBuffer?
RingBuffer is a C++ class. I recommend you change the extension of your Objective-C files from .m to .mm which will make them Objective-C++
Found the answer (or I guess a combination of answers):
Follow coryalder's advice for setting the compiler default to Objective-C++ as described here.
Also, change all .m files to .mm files, and finally add -fno-objc-arc compiler flags to all the .mm files -- which is described in detail here.
I have pch-file with this code:
#import "ServerModel.h"
enum {
SAVE = 1,
REMOVE = 2,
REMOVE_ALL = 3
};
typedef NSInteger RequestType;
and I'm trying to use RequestType in ServerModel.h but compiler doesn't know nothing about my enum. I tried to create header file for my enums and import this file in pch-file but nothing have changed.
So basic problem is: I can't use enums from .pch file in files, that are #imported in this pch-file.
Is there some way to handle this problem? And is pch-file good place to put enums there?
UPD:
I tried to put all this enums in one header file and #import this file in the end of all #imports in pch-file and it doesn't work.
But then I put
#import "Enums.h" // my file with enums
in the beginning of pch-file, before all other #imports and it's working.
I will be glad if somebody will explain the difference in the placement of #import before or after some other #import.
UPD2:
I'll try to make it more clearly:
I have Enums.h with enum:
enum {
SAVE = 1,
REMOVE = 2,
REMOVE_ALL = 3
};
typedef NSInteger RequestType;
MyProject-Prefix.pch with:
#import "ServerModel.h"
#import "Enum.h"
and ServerModel.h with following code:
- (void)unlinkAccountWithRequestType:(RequestType)requestType;
I'm getting an error: Expected a type on this method. I've cleaned my project and getting same error.
When I'm switching #imports like this:
#import "Enums.h"
#import "ServerModel.h"
Everything is good
Case1 : If you import like this
#import "ServerModel.h"
#import "Enums.h"
Then compiler will check ServerModel.h file before Enums.h when it encounters #import "ServerModel.h" statement. And while checking you ServerModel.h it finds a token RequestType and says WTF is RequestType?? and throws error on your face.
Case 2: If you write this
#import "Enums.h"
#import "ServerModel.h"
Then compiler compiles Enums.h successfully and then compiles ServerModel.h and again it finds a token RequestType and says yeah I know this is a typedef of NSInteger which is defined in Enums.h. And finally it moves on happily.