KVO的实现机理,随便解释一下isa-swizzling

isa-swizzlingapp   isa, is a kind ofide swizzling, 混合,搅合。ui   KVO的基础KVC。spa   KVC主要经过isa-swizzling,来实现。指针   [site setValue:@"sitename" forKey:@"name"]; code   编译器处理成:server   SEL sel = sel_get_uid ("s
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