I'm currently messing with ticking Tile Entities and try to learn them.

I try to copy the furnace code as best as I can. First I tried to spawn an item after a certain amount of time which worked great. Then I added the same Progress Bar of the GUI as the furnace. Works also great. But now I noticed that if I quit my single player world and rejoin, the GUI isn't in sync with the spawning anymore, the GUI Progress Bar gets reset every time I rejoin. I think this means that the Server and the Client aren't in sync. I think I'm missing some background info here. Can anyone help me?

 

Here's part of my TileEntity Code:

    @Override
    public void update() {
        if( !hasFaery() ){
            time = 0;
            flag = false;
        }
        if( time <= 0 && hasFaery() ){
            if( flag && !worldObj.isRemote ){
                EntityItem produce = new EntityItem( worldObj, pos.getX(), pos.getY()+1, pos.getZ(), new ItemStack( Items.STICK ) );
                worldObj.spawnEntityInWorld( produce );
            }
            time = MAX_TIME;
            flag = true;
        }
        time--;
        if( hasFaery() ){
            markDirty();
        }
    }

    @Override
    public void readFromNBT( NBTTagCompound compound ){
        super.readFromNBT( compound );
        if( compound.hasKey( "input" ) ){
            inputStack.deserializeNBT( (NBTTagCompound) compound.getTag( "input" ) );
        }
        if( compound.hasKey( "output" ) ){
            outputStack.deserializeNBT( (NBTTagCompound) compound.getTag( "output" ) );
        }
        if( compound.hasKey( "time" ) ){
            time = compound.getInteger( "time" );
        }
    }

    @Override
    public NBTTagCompound writeToNBT( NBTTagCompound compound ){
        super.writeToNBT( compound );
        compound.setTag( "input", inputStack.serializeNBT() );
        compound.setTag( "output", outputStack.serializeNBT() );
        compound.setInteger( "time", time );
        return compound;
    }

    public int getTime(){
        return time;
    }

    public boolean hasFaery(){
        return ( inputStack.getStackInSlot(0) != null );
    }

 

and here my GUI code:

 

   

@Override
    protected void drawGuiContainerBackgroundLayer( float partialTicks, int mouseX, int mouseY ){
        mc.getTextureManager().bindTexture( background );
        drawTexturedModalRect( guiLeft, guiTop, 0, 0, xSize, ySize );
        if( te.hasFaery() ){
            float progress = 22 - ( te.getTime() * 22 / te.MAX_TIME );
            drawTexturedModalRect( guiLeft + 43, guiTop + 7, 180, 0, Math.round( progress ), 15 );
        }
    }

You need to override and implement

getUpdateTag

Cool thanks, I'll try that.