IQKeyboardManagerSwift 3.3.7与ios 7

Question

IQKeyboardManagerSwift说＆＃34; 3.3.7 is the last iOS 7 supported version＆＃34;。

在我的podfile中，我有：

platform :ios, '7.0'
...
pod 'IQKeyboardManagerSwift', '3.3.7'

但是当我运行pod install时，我得到了：

[!] Unable to satisfy the following requirements:
- `IQKeyboardManagerSwift (= 3.3.7)` required by `Podfile`
Specs satisfying the `IQKeyboardManagerSwift (= 3.3.7)` dependency were found, but they required a higher minimum deployment target.

文档说3.3.7适用于7，但在我的代码中似乎并非如此。我错过了什么吗？