Failed to emit precompiled header because Loop condition

Question

Let said I have Swift and Objc classes, and a MyProject-Bridging.h

BazSwiftClass.swift

public class BazSwiftClass: NSObject {
    public let foo: String
    @objc init(foo: String) {
        self.foo = foo
    }
}

FooClass.h

#import "MyProject-Swift.h"
@interface FooClass : NSObject {
     - (BazSwiftClass)bazMethod;
}

I want to access the FooClass.h in another Swift Class (let said BarSwiftClass)

public class BarSwiftClass {
     public hello() -> BazSwiftClass {
          return FooClass().bazMethod()
     } 
}

I need FooClass.h in my swift file, so I added FooClass in my MyProject-Bridging.h

#import "FooClass.h"

So the Flow is like BarSwiftClass -> FooClass -> BazSwiftClass

It can't work because the compiler show "failed to emit precompiled header" and I think it is because of #import "FooClass.h" in MyProejct-Bridging.h

Please help.

Thank you.

you need to import only .h files in bridging header and not .m files so remove reference to .m file clean and rebuild — Sandeep Bhandari, Jun 12 '18 at 08:09
I have import only in .h file, but it still causing the error. I edit my question to avoid confusion. — Jefferson Setiawan, Jun 12 '18 at 08:12
Did you check this link @JeffersonSetiawan https://stackoverflow.com/questions/46293028/xcode-9-failed-to-emit-precompiled-header — Quoc Nguyen, Jun 12 '18 at 08:13
Yes, I know the problem from that link (I use bridging and in the MyProject-bridging, I import that objc file too), but I want to know can I keep using this method? — Jefferson Setiawan, Jun 12 '18 at 08:21
`#import "MyProject-Swift.h"` Should be in **.m** File will solve your issue — Prashant Tukadiya, Jun 12 '18 at 08:22
See my answer https://stackoverflow.com/questions/50507433/objective-c-bridging-header-file-not-found/50508804#50508804 — Prashant Tukadiya, Jun 12 '18 at 08:22
@PrashantTukadiya if I didn't import in the .h file, I got error in this `- (BazSwiftClass)bazMethod;`, it showed BazSwiftClass is not a type. — Jefferson Setiawan, Jun 12 '18 at 08:26

score 4 · Accepted Answer · answered Jun 12 '18 at 08:28

4

Replace your code

#import "MyProject-Swift.h"
@interface FooClass : NSObject {
     - (BazSwiftClass)bazMethod;
}

With

@class BazSwiftClass
@interface FooClass : NSObject {
     - (BazSwiftClass)bazMethod;
}

and in FooClass.m File you can import #import "MyProject-Swift.h"

answered Jun 12 '18 at 08:28

Prashant Tukadiya

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Thank you @PrashantTukadiya !! After use (@)class BazSwiftClass I can make it compiled. – Jefferson Setiawan Jun 12 '18 at 08:44
In general import as few things as possible in your `.h` files and try to use only forward class and protocol references. – Alper Jun 12 '18 at 09:29
In general import as few things as possible in your `.h` files and try to use only forward class and protocol references. – Alper Jun 12 '18 at 09:29

Failed to emit precompiled header because Loop condition

1 Answers1