可以免费商用，必须在app启动页加上 (由OpenIM提供技术支持)
OpenIMSDK
中文文档
Example
To run the example project, clone the repo, and run pod install from the Example directory first.
Requirements
Installation
Open-IM-SDK-iOS is available through CocoaPods. To install it, simply add the following line to your Podfile:
pod 'OpenIMSDK'已知的几个问题
问题1: The 'Pods-xxx' target has transitive dependencies that include statically linked binaries: (xxx/Pods/OpenIMSDKCore/Framework/OpenIMCore.xcframework)
处理Podfile内容（a、b选择其一， 升级2.0.7.4不需要处理）:
a. 删除
use_frameworks!
b. 增加
pre_install do |installer|
Pod::Installer::Xcode::TargetValidator.send(:define_method, :verify_no_static_framework_transitive_dependencies) {}
end问题2: SDK 不支持amrv7架构，注意Xcode的设置。问题3: 升级2.0.7.4后恢复问题1的原有内容。问题4: 有开发者发现使用swift实现sdk的代理API未传递到业务层，需要使用@objc符号修饰。
例如： @objc public func onFriendApplicationAdded:License
OpenIMSDK is available under the MIT license. See the LICENSE file for more info.