Category

最新推荐文章于 2025-05-06 09:20:12 发布
原创 最新推荐文章于 2025-05-06 09:20:12 发布 · 502 阅读 · 0 ·
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本文深入探讨了Objective-C中的类别（Category）机制，解释了它如何为现有类添加新方法，以及其在实现类扩展时的局限性，特别是无法添加实例变量和名称冲突的问题。

二、category是什么

类别是一种为现有的类添加新方法的方式。

利用Objective-C的动态运行时分配机制，Category提供了一种比继承（inheritance）更为简洁的方法来对class进行扩展，无需创建对象类的子类就能为现有的类添加新方法


二、类别的局限性

有两方面局限性：

(1)无法向类中添加新的实例变量，类别没有位置容纳实例变量。

(2)名称冲突，即当类别中的方法与原始类方法名称冲突时，类别具有更高的优先级。类别方法将完全取代初始方法从而无法再使用初始方法。


成功解决TypeError: data type ‘category‘ not understood
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category="IOZ_VDDL"/> <category expression="1ms" category="VIHL_VDDH"/> <category expression="1ms" category="VIHL_VDDL"/> <category expression="1ms" category="VOHL_VDDL"/> <category expression="1ms" category="VOH_VDDL"/> <category expression="1ms" category="VOL_VDDL"/> <category expression="1ms" category="default"/> </dcspec> <dcspec name="Setupdelay_DVDD18_IO" comment=""> <category expression="9ms" category="POWER_OSD"/> <category expression="9ms" category="OS_PS"/> <category expression="9ms" category="OS_VDD"/> <category expression="9ms" category="OS_VSS"/> <category expression="9ms" category="IOZ_VDDH"/> <category expression="9ms" category="IOZ_VDDL"/> <category expression="9ms" category="VIHL_VDDH"/> <category expression="9ms" category="VIHL_VDDL"/> <category expression="9ms" category="VOHL_VDDL"/> <category expression="9ms" category="VOH_VDDL"/> <category expression="9ms" category="VOL_VDDL"/> <category expression="9ms" category="default"/> </dcspec> <dcspec name="Setupdelay_AVDD075_FNPLL" comment=""> <category expression="1ms" category="POWER_OSD"/> <category expression="1ms" category="OS_PS"/> <category expression="1ms" category="OS_VDD"/> <category expression="1ms" category="OS_VSS"/> <category expression="1ms" category="IOZ_VDDH"/> <category expression="1ms" category="IOZ_VDDL"/> <category expression="1ms" category="VIHL_VDDH"/> <category expression="1ms" category="VIHL_VDDL"/> <category expression="1ms" category="VOHL_VDDL"/> <category expression="1ms" category="VOH_VDDL"/> <category expression="1ms" category="VOL_VDDL"/> <category expression="1ms" category="default"/> </dcspec> <dcspec name="Setupdelay_AVDD12_FNPLL" comment=""> <category expression="5ms" category="POWER_OSD"/> <category expression="5ms" category="OS_PS"/> <category expression="5ms" category="OS_VDD"/> <category expression="5ms" category="OS_VSS"/> <category expression="5ms" category="IOZ_VDDH"/> <category expression="5ms" category="IOZ_VDDL"/> <category expression="5ms" category="VIHL_VDDH"/> <category expression="5ms" category="VIHL_VDDL"/> <category expression="5ms" category="VOHL_VDDL"/> <category expression="5ms" category="VOH_VDDL"/> <category expression="5ms" category="VOL_VDDL"/> <category expression="5ms" category="default"/> </dcspec> <dcspec name="Trise_VDD" comment=""> <category expression="2ms" category="POWER_OSD"/> <category expression="2ms" category="OS_PS"/> <category expression="2ms" category="OS_VDD"/> <category expression="2ms" category="OS_VSS"/> <category expression="2ms" category="IOZ_VDDH"/> <category expression="2ms" category="IOZ_VDDL"/> <category expression="2ms" category="VIHL_VDDH"/> <category expression="2ms" category="VIHL_VDDL"/> <category expression="2ms" category="VOHL_VDDL"/> <category expression="2ms" category="VOH_VDDL"/> <category expression="2ms" category="VOL_VDDL"/> <category expression="2ms" category="default"/> </dcspec> <dcspec name="Trise_VDDC" comment=""> <category expression="2ms" category="POWER_OSD"/> <category expression="2ms" category="OS_PS"/> <category expression="2ms" category="OS_VDD"/> <category expression="2ms" category="OS_VSS"/> <category expression="2ms" category="IOZ_VDDH"/> <category expression="2ms" category="IOZ_VDDL"/> <category expression="2ms" category="VIHL_VDDH"/> <category expression="2ms" category="VIHL_VDDL"/> <category expression="2ms" category="VOHL_VDDL"/> <category expression="2ms" category="VOH_VDDL"/> <category expression="2ms" category="VOL_VDDL"/> <category expression="2ms" category="default"/> </dcspec> <dcspec name="Trise_DVDD18_IO" comment=""> <category expression="1ms" category="POWER_OSD"/> <category expression="1ms" category="OS_PS"/> <category expression="1ms" category="OS_VDD"/> <category expression="1ms" category="OS_VSS"/> <category expression="1ms" category="IOZ_VDDH"/> <category expression="1ms" category="IOZ_VDDL"/> <category expression="1ms" category="VIHL_VDDH"/> <category expression="1ms" category="VIHL_VDDL"/> <category expression="1ms" category="VOHL_VDDL"/> <category expression="1ms" category="VOH_VDDL"/> <category expression="1ms" category="VOL_VDDL"/> <category expression="1ms" category="default"/> </dcspec> <dcspec name="Trise_AVDD075_FNPLL" comment=""> <category expression="2ms" category="POWER_OSD"/> <category expression="2ms" category="OS_PS"/> <category expression="2ms" category="OS_VDD"/> <category expression="2ms" category="OS_VSS"/> <category expression="2ms" category="IOZ_VDDH"/> <category expression="2ms" category="IOZ_VDDL"/> <category expression="2ms" category="VIHL_VDDH"/> <category expression="2ms" category="VIHL_VDDL"/> <category expression="2ms" category="VOHL_VDDL"/> <category expression="2ms" category="VOH_VDDL"/> <category expression="2ms" category="VOL_VDDL"/> <category expression="2ms" category="default"/> </dcspec> <dcspec name="Trise_AVDD12_FNPLL" comment=""> <category expression="2ms" category="POWER_OSD"/> <category expression="2ms" category="OS_PS"/> <category expression="2ms" category="OS_VDD"/> <category expression="2ms" category="OS_VSS"/> <category expression="2ms" category="IOZ_VDDH"/> <category expression="2ms" category="IOZ_VDDL"/> <category expression="2ms" category="VIHL_VDDH"/> <category expression="2ms" category="VIHL_VDDL"/> <category expression="2ms" category="VOHL_VDDL"/> <category expression="2ms" category="VOH_VDDL"/> <category expression="2ms" category="VOL_VDDL"/> <category expression="2ms" category="default"/> </dcspec> <dcspec name="Vil_gIO_Digital_All" comment=""> <category expression="0" category="POWER_OSD"/> <category expression="0" category="OS_PS"/> <category expression="0" category="OS_VDD"/> <category expression="0" category="OS_VSS"/> <category expression="0*DVDD18_IO*Vcoef*Vcoef_IO" category="IOZ_VDDH"/> <category expression="0*DVDD18_IO*Vcoef*Vcoef_IO" category="IOZ_VDDL"/> <category expression="0.35*DVDD18_IO*Vcoef*Vcoef_IO" category="VIHL_VDDH"/> <category expression="0.35*DVDD18_IO*Vcoef*Vcoef_IO" category="VIHL_VDDL"/> <category expression="0*DVDD18_IO*Vcoef*Vcoef_IO" category="VOHL_VDDL"/> <category expression="0*DVDD18_IO*Vcoef*Vcoef_IO" category="VOH_VDDL"/> <category expression="0*DVDD18_IO*Vcoef*Vcoef_IO" category="VOL_VDDL"/> <category expression="0*DVDD18_IO*Vcoef*Vcoef_IO" category="default"/> </dcspec> <dcspec name="Vih_gIO_Digital_All" comment=""> <category expression="0" category="POWER_OSD"/> <category expression="0" category="OS_PS"/> <category expression="0" category="OS_VDD"/> <category expression="0" category="OS_VSS"/> <category expression="1*DVDD18_IO*Vcoef*Vcoef_IO" category="IOZ_VDDH"/> <category expression="1*DVDD18_IO*Vcoef*Vcoef_IO" category="IOZ_VDDL"/> <category expression="0.65*DVDD18_IO*Vcoef*Vcoef_IO" category="VIHL_VDDH"/> <category expression="0.65*DVDD18_IO*Vcoef*Vcoef_IO" category="VIHL_VDDL"/> <category expression="1*DVDD18_IO*Vcoef*Vcoef_IO" category="VOHL_VDDL"/> <category expression="1*DVDD18_IO*Vcoef*Vcoef_IO" category="VOH_VDDL"/> <category expression="1*DVDD18_IO*Vcoef*Vcoef_IO" category="VOL_VDDL"/> <category expression="1*DVDD18_IO*Vcoef*Vcoef_IO" category="default"/> </dcspec> <dcspec name="Vol_gIO_Digital_All" comment=""> <category expression="0" category="POWER_OSD"/> <category expression="0" category="OS_PS"/> <category expression="0.05" category="OS_VDD"/> <category expression="-1" category="OS_VSS"/> <category expression="0.45" category="IOZ_VDDH"/> <category expression="0.45" category="IOZ_VDDL"/> <category expression="0.4*DVDD18_IO*Vcoef*Vcoef_IO" category="VIHL_VDDH"/> <category expression="0.4*DVDD18_IO*Vcoef*Vcoef_IO" category="VIHL_VDDL"/> <category expression="0.45" category="VOHL_VDDL"/> <category expression="0.4*DVDD18_IO*Vcoef*Vcoef_IO" category="VOH_VDDL"/> <category expression="0.45" category="VOL_VDDL"/> <category expression="0.4*DVDD18_IO*Vcoef*Vcoef_IO" category="default"/> </dcspec> <dcspec name="Voh_gIO_Digital_All" comment=""> <category expression="0" category="POWER_OSD"/> <category expression="0" category="OS_PS"/> <category expression="0.95" category="OS_VDD"/> <category expression="-0.05" category="OS_VSS"/> <category expression="DVDD18_IO*Vcoef*Vcoef_IO-0.45" category="IOZ_VDDH"/> <category expression="DVDD18_IO*Vcoef*Vcoef_IO-0.45" category="IOZ_VDDL"/> <category expression="0.6*DVDD18_IO*Vcoef*Vcoef_IO" category="VIHL_VDDH"/> <category expression="0.6*DVDD18_IO*Vcoef*Vcoef_IO" category="VIHL_VDDL"/> <category expression="DVDD18_IO*Vcoef*Vcoef_IO-0.45" category="VOHL_VDDL"/> <category expression="DVDD18_IO*Vcoef*Vcoef_IO-0.45" category="VOH_VDDL"/> <category expression="0.6*DVDD18_IO*Vcoef*Vcoef_IO" category="VOL_VDDL"/> <category expression="0.6*DVDD18_IO*Vcoef*Vcoef_IO" category="default"/> </dcspec> <dcspec name="Vt_gIO_Digital_All" comment=""> <category expression="0" category="POWER_OSD"/> <category expression="0" category="OS_PS"/> <category expression="1" category="OS_VDD"/> <category expression="-1.1" category="OS_VSS"/> <category expression="0.5*DVDD18_IO*Vcoef*Vcoef_IO" category="IOZ_VDDH"/> <category expression="0.5*DVDD18_IO*Vcoef*Vcoef_IO" category="IOZ_VDDL"/> <category expression="0.5*DVDD18_IO*Vcoef*Vcoef_IO" category="VIHL_VDDH"/> <category expression="0.5*DVDD18_IO*Vcoef*Vcoef_IO" category="VIHL_VDDL"/> <category expression="0.5*DVDD18_IO*Vcoef*Vcoef_IO" category="VOHL_VDDL"/> <category expression="0.5*DVDD18_IO*Vcoef*Vcoef_IO" category="VOH_VDDL"/> <category expression="0.5*DVDD18_IO*Vcoef*Vcoef_IO" category="VOL_VDDL"/> <category expression="0.5*DVDD18_IO*Vcoef*Vcoef_IO" category="default"/> </dcspec> <dcspec name="Iol_gIO_Digital_All" comment=""> <category expression="0" category="POWER_OSD"/> <category expression="0" category="OS_PS"/> <category expression="0.0008" category="OS_VDD"/> <category expression="0.6mA" category="OS_VSS"/> <category expression="3mA" category="IOZ_VDDH"/> <category expression="2mA" category="IOZ_VDDL"/> <category expression="2mA" category="VIHL_VDDH"/> <category expression="2mA" category="VIHL_VDDL"/> <category expression="2mA" category="VOHL_VDDL"/> <category expression="2mA" category="VOH_VDDL"/> <category expression="2mA" category="VOL_VDDL"/> <category expression="10mA" category="default"/> </dcspec> <dcspec name="Ioh_gIO_Digital_All" comment=""> <category expression="0" category="POWER_OSD"/> <category expression="0" category="OS_PS"/> <category expression="0.0008" category="OS_VDD"/> <category expression="0.6mA" category="OS_VSS"/> <category expression="3mA" category="IOZ_VDDH"/> <category expression="2mA" category="IOZ_VDDL"/> <category expression="2mA" category="VIHL_VDDH"/> <category expression="2mA" category="VIHL_VDDL"/> <category expression="2mA" category="VOHL_VDDL"/> <category expression="2mA" category="VOH_VDDL"/> <category expression="2mA" category="VOL_VDDL"/> <category expression="10mA" category="default"/> </dcspec> <dcspec name="Vch_gIO_Digital_All" comment=""> <category expression="1.5" category="POWER_OSD"/> <category expression="1.5" category="OS_PS"/> <category expression="1.5" category="OS_VDD"/> <category expression="1.5" category="OS_VSS"/> <category expression="0" category="IOZ_VDDH"/> <category expression="0" category="IOZ_VDDL"/> <category expression="0" category="VIHL_VDDH"/> <category expression="0" category="VIHL_VDDL"/> <category expression="0" category="VOHL_VDDL"/> <category expression="0" category="VOH_VDDL"/> <category expression="0" category="VOL_VDDL"/> <category expression="0" category="default"/> </dcspec> <dcspec name="Vcl_gIO_Digital_All" comment=""> <category expression="-1" category="POWER_OSD"/> <category expression="-1" category="OS_PS"/> <category expression="-1.5" category="OS_VDD"/> <category expression="-1.5" category="OS_VSS"/> <category expression="0" category="IOZ_VDDH"/> <category expression="0" category="IOZ_VDDL"/> <category expression="0" category="VIHL_VDDH"/> <category expression="0" category="VIHL_VDDL"/> <category expression="0" category="VOHL_VDDL"/> <category expression="0" category="VOH_VDDL"/> <category expression="0" category="VOL_VDDL"/> <category expression="0" category="default"/> </dcspec> </dcspectable> </dcspecfile> 使用python 转换上述xml 为excel, 其中categorys为行标题，在第一行，dcspectable中各dcspec 的name 为列标题，其中的category子项中的category值对应上述行标题，expression为值，我需要你转换计算expression的值，其中会有表达式，表达式中的变量对应dcspec name里category 对应的expression值，但是有些有电流或者电压的单位，计算时需要注意，我需要你输出一个计算后的excel
最新发布
08-27
数据结构：根据描述，XML中应包含多个category（作为行），每个category下可能有多个dcspec（作为列），每个dcspec有name和表达式（expression）以及可能涉及到的变量。 3. 表达式计算：表达式可能包含变量和单位...
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