# 03.ViewBuilder参数10个限制

> 看看下面的代码，发现当`ViewBuilder`中超过10个元素的时候会报错，10个就没问题， 代码逻辑本身是没问题的 具体可以看下下面的文档，其实是将参数的个数做了限制

![01](/files/-MUpQnWD8ZAQhBmhCqP3) ![01](/files/-MUpQnWFthu_lNK8eKuj)

> [Apple文档：ViewBuilder](https://developer.apple.com/documentation/swiftui/viewbuilder)

```swift
static func buildBlock<C0, C1, C2, C3, C4, C5, C6, C7, C8, C9>(C0, C1, C2, C3, C4, C5, C6, C7, C8, C9) -> TupleView<(C0, C1, C2, C3, C4, C5, C6, C7, C8, C9)>
```

> 不清楚苹果这样做的具体原因，但这样可以强迫咱们注意封装拆分。强行解释一波<\_<


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