iOS 调H5方法不执行没反应的坑

调用H5的方法需要给H5传一些参数，参数中包括图片的base64字符串。

错误一：

图片转base64，后面参数不能随便写，正确做法如下

NSData *imageData = UIImageJPEGRepresentation(img,0.1);
    NSString *strImgBase64 = [imageData base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed];

把NSDataBase64EncodingEndLineWithLineFeed换成枚举中的其他值转成的base64，然后拼到json字符串中时，校验根本不通过，所以调H5没反应。

错误二：

把参数拼成json字符串时，字典转json字符串作为参数调H5根本没反应

//第一层
    NSMutableDictionary *mDicBack = [NSMutableDictionary new];
    mDicBack[@"msg"] = @"success";
    mDicBack[@"code"] = @"0";
    
    //第二层
    NSMutableDictionary *mDic2 = [NSMutableDictionary new];
    mDic2[@"fromserver"] = dic;
    mDic2[@"base64"] = [NSString stringWithFormat:@"data:image/jpg;base64,%@",strImgBase64];
    
    mDicBack[@"data"] = mDic2;
    
　　//字典转json字符串
    if ([NSJSONSerialization isValidJSONObject:mDicBack])
    {
        NSData * jsonData = [NSJSONSerialization dataWithJSONObject:mDicBack options:NSJSONWritingPrettyPrinted error:nil];
        jsonStr = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];
    }

NSString *backJson = [NSString stringWithFormat:@"callBack('%@')", jsonStr];
    [self.h5View stringByEvaluatingJavaScriptFromString:backJson];

只能换下面手工拼接方法才行。

jsonStr = [NSString stringWithFormat:@"{"msg":"success","code":"0","data":{"fromserver":{"result":%@,"message":"%@","path":"%@","serverpath":"\%@"},"base64":"data:image/png;base64,%@"}}",dic[@"result"],dic[@"message"],dic[@"path"],dic[@"serverpath"],strImgBase64];