[iOS] atomic和nonatomic
已經開發iOS App超過五年的我，在宣告Property Attributes一直以來都是用nonatomic，尚未使用到預設的atomic。
@property (strong, nonatomic) UIWindow *window;
現在有個情況是有好幾個Thread有機會同時存取（set和get）同一個Property，此時就有必要使用atomic。可是了解後發現，atomic不能保證我存取的值是正確的，到底是怎麼一回事呢？
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