关于内存优化，人云亦云 各有己见。本文将通过设置Strpping Level ，减少内存使用。
先看三幅图：
1、没做任何优化，默认选项 
2、设置Stripping level 为 Use micro mscorlib; 设置 script call Optimization为Fast but no exceptions
因为本demo用到jsonFX json解析器，牵扯到system.dll 里面的东西，所以程序直接崩掉。（Don't use anything that lives in System.dll or System.Xml.dll in your code. Those two are not compatible with micro mscorlib.）
3、解决了以上bug，优化后的效果：
内存基本减少了8.5MB 左右
如何解决第二部的残留问题呢：官方给了这么一个说法
How to Deal with Stripping when Using Reflection
Stripping heavily depends on static code analysis and sometimes it fails to do the job right, especially when dynamic features (like reflection) are used. In such cases some hinting what classes shouldn't be touched is needed. Unity iOS supports per project custom stripping black list. The process is simple:
1. Create link.xml file and place it directly into Assets (project root) folder.
2. link.xml sample structure is as follows:
<linker>
<assembly fullname="System.Web.Services">
<type fullname="System.Web.Services.Protocols.SoapTypeStubInfo" preserve="all"/>
<type fullname="System.Web.Services.Configuration.WebServicesConfigurationSectionHandler" preserve="all"/>
</assembly>
<assembly fullname="System">
<type fullname="System.Net.Configuration.WebRequestModuleHandler" preserve="all"/>
<type fullname="System.Net.HttpRequestCreator" preserve="all"/>
<type fullname="System.Net.FileWebRequestCreator" preserve="all"/>
</assembly>
</linker>
结合本例：需要如下link.xml文件
<linker>
<assembly fullname="System">
<type fullname="System.ComponentModel.TypeConverter" preserve="all"/>
<type fullname="System.ComponentModel.ArrayConverter" preserve="all"/>
<type fullname="System.ComponentModel.BaseNumberConverter" preserve="all"/>
<type fullname="System.ComponentModel.BooleanConverter" preserve="all"/>
<type fullname="System.ComponentModel.ByteConverter" preserve="all"/>
<type fullname="System.ComponentModel.CharConverter" preserve="all"/>
<type fullname="System.ComponentModel.CollectionConverter" preserve="all"/>
<type fullname="System.ComponentModel.ComponentConverter" preserve="all"/>
<type fullname="System.ComponentModel.CultureInfoConverter" preserve="all"/>
<type fullname="System.ComponentModel.DateTimeConverter" preserve="all"/>
<type fullname="System.ComponentModel.DecimalConverter" preserve="all"/>
<type fullname="System.ComponentModel.DoubleConverter" preserve="all"/>
<type fullname="System.ComponentModel.EnumConverter" preserve="all"/>
<type fullname="System.ComponentModel.ExpandableObjectConverter" preserve="all"/>
<type fullname="System.ComponentModel.Int16Converter" preserve="all"/>
<type fullname="System.ComponentModel.Int32Converter" preserve="all"/>
<type fullname="System.ComponentModel.Int64Converter" preserve="all"/>
<type fullname="System.ComponentModel.NullableConverter" preserve="all"/>
<type fullname="System.ComponentModel.SByteConverter" preserve="all"/>
<type fullname="System.ComponentModel.SingleConverter" preserve="all"/>
<type fullname="System.ComponentModel.StringConverter" preserve="all"/>
<type fullname="System.ComponentModel.TimeSpanConverter" preserve="all"/>
<type fullname="System.ComponentModel.UInt16Converter" preserve="all"/>
<type fullname="System.ComponentModel.UInt32Converter" preserve="all"/>
<type fullname="System.ComponentModel.UInt64Converter" preserve="all"/>
</assembly>
</linker>
第二步的错误得出 JsonFX需要依赖System.dll中的类型转化函数，所以通过以上link文件 保留system.dll中的类型转换函数。
另附：反射的link如下：
<linker>
<assembly fullname="mscorlib">
<type fullname="System.Reflection"preserve="all"/>
<type fullname="System.Security.Cryptography"preserve="all"/>
</assembly>
</linker>
参考资料：http://www.rbcafe.com/Softwares/Unity/Documentation/Manual/iphone-playerSizeOptimization.html