KVO的實現機理，隨便解釋一下isa-swizzling

isa-swizzlingapp   isa, is a kind ofide swizzling, 混合，攪合。ui   KVO的基礎KVC。spa   KVC主要經過isa-swizzling，來實現。指針   [site setValue:@"sitename" forKey:@"name"]; code   編譯器處理成：server   SEL sel = sel_get_uid ("s

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