How do we clear out contents in NSMutableData

If you want an empty buffer:

[data setLength:0];

If you want to keep its size but set all the bytes to zero:

[data resetBytesInRange:NSMakeRange(0, [data length])];

objective-c iphone nsdata

Swift version of the setting all the bytes to zero:

data.resetBytes(in: NSRange(location:0, length:data.length))

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