IOS开发---菜鸟学习之路--（十四）-将BASE64图片转换成Image

1 #import <Foundation/Foundation.h>
2 
3 @interface Base64AndImageHelp : NSObject
4 - (NSString*)encodeURL:(NSString *)string;
5 +(id)mydataWithBase64EncodedString:(NSString *)string ;
6 @end

  1 #import "Base64AndImageHelp.h"
  2 @interface NSData (MBBase64)
  3 
  4 + (id)dataWithBase64EncodedString:(NSString *)string;
  5 - (NSString *)base64Encoding;
  6 
  7 @end
  8 static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  9 
 10 @implementation NSData (MBBase64)
 11 
 12 + (id)dataWithBase64EncodedString:(NSString *)string {
 13     if (string == nil)
 14         [NSException raise:NSInvalidArgumentException format:@""];
 15     
 16     if ([string length] == 0)
 17         return [NSData data];
 18     
 19     static char *decodingTable = NULL;
 20     
 21     if (decodingTable == NULL) {
 22         decodingTable = malloc(256);
 23         if (decodingTable == NULL)
 24             return nil;
 25         memset(decodingTable, CHAR_MAX, 256);
 26         NSUInteger i;
 27         for (i = 0; i < 64; i++)
 28             decodingTable[(short)encodingTable[i]] = i;
 29     }
 30     
 31     const char *characters = [string cStringUsingEncoding:NSASCIIStringEncoding];
 32     if (characters == NULL)
 33         return nil;
 34     char *bytes = malloc((([string length] + 3) / 4) * 3);
 35     if (bytes == NULL)
 36         return nil;
 37     
 38     NSUInteger length = 0;
 39     NSUInteger i = 0;
 40     
 41     while (YES) {
 42         char buffer[4];
 43         short bufferLength;
 44         for (bufferLength = 0; bufferLength < 4; i++) {
 45             if (characters[i] == '