SWIFT_VERSION '3.0' is unsupport

SWIFT_VERSION '3.0' is unsupported, supported versions are: 4.0, 4.2, 5.0. (in target 'Charts')
解决办法:

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找到pod->在TARGETS里面找到Charts->Build Settings里面找到Swift Compiler - language 改一下Swift Language Version 的版本号即可。

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