Swift Bridging Header and visibility of Obj-C clas

问题:

I've aded bridging header, specified in build settings the full path to it, bridging header was created automatically. After this, i've included my obj-c header files in it. But every attempt of calling constructor of object fails : "Use of undeclared identifier".

The list of things i've done :

1. Created .m file and Xcode proposed to create bridging header
2. Added obj-c files to project and imported them in header
3. In build setting provided the FULL path to bridging header file

4. Used Obj-C type in code... But it doesn't builds.
5. Then, i provided not the full path to the header, but the path from the folder in which project is - no result.

I double-checked all the steps according to apple documentation, but no result. Why? Any help would be appreciated.

回答1:

Follow these steps:

1. Create a Swift project
2. Add a test class as Cocoa Class instead of .m and .h separately. Xcode prompt add bridging header.
3. Import test class header in bridging header, which you already did. Should have no issue instantiate test class in Swift.
4. Copy BL_KeyChainWrapper .m and .h to project directory in finder.
5. Drag BL_KeyChainWrapper files to project and make sure Add to Targets.
6. Import BL_KeyChainWrapper header in bridging header.
7. Instantiate BL_KeyChainWrapper class in Swift.

If followed the above steps, and still have the error. It is probably that you didn't declare a class named BL_KeyChainWrapper in BL_KeyChainWrapper.h. Make sure in your BL_KeyChainWrapper.h, you have code like following:

@interface BL_KeyChainWrapper : BaseClass

回答2:

Well, after creating a test project with bridging header, I found out the following:

1. I added .m file, Xcode proposed me to create bridging header.

2. I added .h file, named it as class and created Obj-C class in this way.

AND:

In build settings - code generation section looks like this:

Bridging file located at the following path:

ProjName / BridgHeader.h

At the same level as .xcodeproj file exists.

BUT:

When I added already created Obj-C class to project and added header import in bridging header, I couldn't use it:

So, I guess, Xcode 6 beta 2 cannot add existing files to swift project. Did anyone face this trouble? Cause I don't want to paste all existing libraries, that I was developing for 5 years to created files.

P.S:

Bridging header: