xcode how to call dylib

mac os in xcode how to call dylib, even white, the more detailed the better, the best step by step, or presentation materials, I do not find some great detail
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And c as c language calling directly on the line
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No friends? ? ?
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Does not support it.
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dlopen
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Is not also specify the path where? ? ? Whether it is an absolute path or a relative path, dlopen returns are empty
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dylib xcode where to put the files? ? ?
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Originally compiler option i386 x86_64 and dynamic library calls that do not match the reason, change overnight, but the success of open dlopen, dlsym but returned empty, where else did a good job? ? ?