主要由于 UIImage 转Base64 字符串方法造成
-(NSString*)UIImageToBase64Str:(UIImage *img)
{
NSData*data =UIImageJPEGRepresentation(img,1.0f);
NSString*encodedImageStr = [database64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
//ios base64字符串存在 “+” 需要替换成 "%2B"
encodedImageStr = [encodedImageStrstringByReplacingOccurrencesOfString:@"+"withString:@"%2B"];
returnencodedImageStr;
}