iOS
NSData

Observaciones

Creando objetos NSData

Usando un archivo

Rápido

let data = NSData(contentsOfFile: filePath) //assuming filePath is a valid path

C objetivo

NSData *data = [NSData dataWithContentsOfFile:filePath]; //assuming filePath is a valid path

Usando un objeto String

Rápido

let data = (string as NSString).dataUsingEncoding(NSUTF8StringEncoding) //assuming string is a String object

C objetivo

NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding]; //assuming string is a String object

Convertir NSData a otros tipos

Encadenar

Rápido

let string = String(NSString(data: data, encoding: NSUTF8StringEncoding)) //assuming data is a valid NSData object

C objetivo

NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; //assuming data is a valid NSData object
[string release];

A Array

Rápido

let array = data.bytes as! NSMutableArray //assuming data is a valid NSData object

C objetivo

NSMutableArray *array = (NSMutableArray *)[data bytes]; //assuming data is a valid NSData object

A la matriz de bytes

Rápido

let bytesArray = data.bytes as! UInt8 //assuming data is a valid NSData object

C objetivo

UInt8 *bytesArray = (UInt8 *)data.bytes; //assuming data is a valid NSData object

Convertir NSData a cadena HEX

NSData se puede representar como una cadena hexadecimal, similar a lo que produce en su método de description .

Rápido

extension NSData {

    func hexString() -> String {
        return UnsafeBufferPointer<UInt8>(start: UnsafePointer<UInt8>(bytes), count: length)
            .reduce("") { $0 + String(format: "%02x", $1) }
    }

}

C objetivo

@implementation NSData (HexRepresentation)

- (NSString *)hexString {
    const unsigned char *bytes = (const unsigned char *)self.bytes;
    NSMutableString *hex = [NSMutableString new];
    for (NSInteger i = 0; i < self.length; i++) {
        [hex appendFormat:@"%02x", bytes[i]];
    }
    return [hex copy];
}

@end