iOS 图片和字符串的相互转化

//图片转字符串
-(NSString *)UIImageToBase64Str:(UIImage *) image
{
NSData *data = UIImageJPEGRepresentation(image, 1.0f);
NSString *encodedImageStr = [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
return encodedImageStr;
}

//字符串转图片
-(UIImage *)Base64StrToUIImage:(NSString *)_encodedImageStr
{
NSData *_decodedImageData   = [[NSData alloc] initWithBase64Encoding:_encodedImageStr];
UIImage *_decodedImage      = [UIImage imageWithData:_decodedImageData];
return _decodedImage;
}