系统自带输入法没有换行，需要使用第三方输入法才能换行。
工具：iPhone4、讯飞输入法。
1、打开手机桌面上的微信图标。
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https://iknow-pic.cdn.bcebos.com/d01373f082025aaf32cb0724f5edab64024f1a67"/>
2、进入聊天界面，点击下方的输入法选择图标。
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https://iknow-pic.cdn.bcebos.com/d8f9d72a6059252d23ee64eb3a9b033b5ab5b960"/>
3、再选择菜单上的讯飞输入法。
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https://iknow-pic.cdn.bcebos.com/a8ec8a13632762d02594dd50aeec08fa503dc6b3"/>
4、输入文字后，点击菜单上的换行按钮。
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https://iknow-pic.cdn.bcebos.com/8326cffc1e178a8211db064ff803738da877e87e"/>
5、可以看到输入框中的文字就完成换行了。
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https://iknow-pic.cdn.bcebos.com/0b7b02087bf40ad1a871be0c592c11dfa8ecce4c"/>