[iOS] 消除特定字元 (Eliminate Specific Characters)
有時候我想要消除一段字串裡的某些字元，比如說我要消除「空白字元」、「數字」或是「字母」等等，甚至任何我想消除的多個字元（如：「123xyzˊ_>ˋ<;」），可以怎麼做呢？只要把想消除的字元通通都丟到集合中，呼叫內建的方法即可達成！
學會消除特定字元 (Eliminate Specific Characters)，以後我就不用慢慢刪除空白字元啦～
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