问题1
Type 'ChartDataSet' does not conform to protocol 'RangeReplaceableCollection'
Unavailable instance method 'replaceSubrange(_:with:)' was used to satisfy a requirement of protocol 'RangeReplaceableCollection'
解决方法：
在 extension ChartDataSet: RangeReplaceableCollection 添加一下方法
public func replaceSubrange<C>(_ subrange: Swift.Range<Index>, with newElements: C) where C : Collection, Element == C.Element {
fatalError()
}
问题2
The compiler is unable to type-check this expression in reasonable time; try breaking up the expression into distinct sub-expressions
解决方法：
查看代码中是否带有很长的算式，尽可能简化
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