[iOS] 單例 (Singleton)
單例 (Singleton) 或稱單一實體，也就是程式運行時，此Class永遠只有一個實體。
原本生成一個實體寫法：
HappyClass *class = [[HappyClass alloc] init];
程式每次執行到此，都會重新生成一個實體。若有多重執行緒，很有可能不小心生成多個實體；或是操作流程多變，也是可能會生成多個實體。
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