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https://github.com/DarielChen/iOSTips/tree/master/Demo/47.%25E7%25BB%2599App%25E7%259A%2584%25E6%259F%2590%25E4%25B8%25AA%25E5%258A%259F%25E8%2583%25BD%25E6%25B7%25BB%25E5%258A%25A0%25E5%25BF%25AB%25E6%258D%25B7%25E6%2596%25B9%25E5%25BC%258F