如何将NSString转换为字节

Question

NSString *test = @"ABCDEFGHIJKLMNOPQRSTUVWXYZ";

如何将此字符串转换为字节？

Answer 1

NSData *bytes = [test dataUsingEncoding:NSUTF8StringEncoding];

Answer 2

你想要这样的东西：

NSString *test=@"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
NSUInteger bytes = [test lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"%i bytes", bytes);

Answer 3

extension String {
    var byteArray : [Byte] {
        return Array(utf8)
    }
}

更新： Xcode 7.2.1•Swift 2.1.1

extension String {
    var byteArray : [UInt8] {
        return Array(utf8)
    }
}

测试：

"ABCDEFGHIJKLMNOPQRSTUVWXYZ".byteArray  // [65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90]