If I create a new NSData object of a specific size using dataWithBytes:length:, what is the most efficient way to create the input bytes (20 Mb worth) of random characters, preferably without reading the data in from a file? I need a unique buffer of a specific size each time.If I create a new NSData object of a specific s
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生成具有特定长度的随机字节的NSData对象的最佳方法?
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