@interfaceNSData (Base64)
/**
?*? @brief? 字符串base64后轉data
?*/
+ (NSData*)dataWithBase64EncodedString:(NSString*)string
{
? ? if(![string length])returnnil;
? ? NSData *decoded =nil;
#if __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_9 || __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0
? ? if(![NSData instancesRespondToSelector:@selector(initWithBase64EncodedString:options:)])
? ? {
#pragma clang diagnostic push
#pragma clang diagnostic ignored"-Wdeprecated-declarations"
? ? ? ? decoded = [[selfalloc] initWithBase64Encoding:[string stringByReplacingOccurrencesOfString:@"[^A-Za-z0-9+/=]"withString:@""options:NSRegularExpressionSearch range:NSMakeRange(0, [string length])]];
#pragma clang diagnostic pop
? ? }
? ? else
#endif
? ? {
? ? ? ? decoded = [[selfalloc] initWithBase64EncodedString:string options:NSDataBase64DecodingIgnoreUnknownCharacters];
? ? }
? ? return[decoded length]? decoded:nil;
}
/**
?*? @brief? NSData轉string
?*? @param wrapWidth 換行長度? 76? 64
?*/
- (NSString *)base64EncodedStringWithWrapWidth:(NSUInteger)wrapWidth
{
? ? if(![selflength])returnnil;
? ? NSString *encoded =nil;
#if __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_9 || __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0
? ? if(![NSData instancesRespondToSelector:@selector(base64EncodedStringWithOptions:)])
? ? {
#pragma clang diagnostic push
#pragma clang diagnostic ignored"-Wdeprecated-declarations"
? ? ? ? encoded = [selfbase64Encoding];
#pragma clang diagnostic pop
? ? }
? ? else
#endif
? ? {
? ? ? ? switch(wrapWidth)
? ? ? ? {
? ? ? ? ? ? case64:
? ? ? ? ? ? {
? ? ? ? ? ? ? ? return[selfbase64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
? ? ? ? ? ? }
? ? ? ? ? ? case76:
? ? ? ? ? ? {
? ? ? ? ? ? ? ? return[selfbase64EncodedStringWithOptions:NSDataBase64Encoding76CharacterLineLength];
? ? ? ? ? ? }
? ? ? ? ? ? default:
? ? ? ? ? ? {
? ? ? ? ? ? ? ? encoded = [selfbase64EncodedStringWithOptions:(NSDataBase64EncodingOptions)0];
? ? ? ? ? ? }
? ? ? ? }
? ? }
? ? if(!wrapWidth || wrapWidth >= [encoded length])
? ? {
? ? ? ? returnencoded;
? ? }
? ? wrapWidth = (wrapWidth /4) *4;
? ? NSMutableString *result = [NSMutableString string];
? ? for(NSUInteger i =0; i < [encoded length]; i+= wrapWidth)
? ? {
? ? ? ? if(i + wrapWidth >= [encoded length])
? ? ? ? {
? ? ? ? ? ? [result appendString:[encoded substringFromIndex:i]];
? ? ? ? ? ? break;
? ? ? ? }
? ? ? ? [result appendString:[encoded substringWithRange:NSMakeRange(i, wrapWidth)]];
? ? ? ? [result appendString:@"\r\n"];
? ? }
? ? returnresult;
}
/**
?*? @brief? NSData轉string 換行長度默認64
?*/
- (NSString *)base64EncodedString
{
? ? return[selfbase64EncodedStringWithWrapWidth:0];
}
