我之前从未遇到过这个错误，有人能告诉我如何修复它。 我在模拟和ios设备上运行时出现此错误。
ld: file not found: -fobjc-link-runtime
clang: error: linker command failed with exit code 1 (use -v to see invocation)
(null): File not found: -fobjc-link-runtime
(null): Linker command failed with exit code 1 (use -v to see invocation)