Lessons learned from eaGeier #7

Creating a Done Button

As described before, the eaGeier needs a doneButton e.g. to close the date picker.

As it is needed on several occasions, it is best to create it lazily in its getter method. To do that create a custom button, set its frame and its font. To get the “button-style feeling” set the background using a gradient image. Setting its alpha to 0.8 shows what is below but still keeps the text of the button readable. And finally set the action which should be fired when the the button is touched:
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cs106a – Lecture #2: Programming & Control Structures

Prerequisites to the second lecture is reading the chapters 1 to 3 of “Karel the Robot learns Java”.

Karel knows four basic commands (or methods):

move()
turnLeft()
pickBeeper()
putBeeper()

To run feed Karel commands, first import Karels basic commands, create a class derived from Karel and put the commands into a run() method:
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cs106a – Lecture #1: Introduction

The first lecture mainly provides administrative details about the course. Two text books are named to be required for the course:

Karel the Robot Learns Java, which is included in the iTunes stream and
Roberts, Eric: The Art and Science of Java with slides and code available for free at Stanford.

It also refers to the Stanford Honor Code states:

Rule 3: You must not look at solution sets or program code from other years.
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cs106a – Programming Methodology

The course cs106a Programming Methodology teaches the widely-used Java programming language along with software engineering principles. Its lectures from Fall 2007 are provided as streams via iTunes. While the iTunes feed includes the handouts and assignments from 2007, its homepage at Stanford provides the material of the recent course.

Lessons learned from eaGeier #6

Creating a Date Picker

The eaGeier needs the possibility to enter a date e.g. to specify the purchase date for a voucher. Just providing a simple text field seems a little bit tedious. Thus – instead of opening a normal keyboard – the eaGeier provides a date picker, when a date field is selected, but at the same time keeps the possibility of entering a date via a hardware keyboard.

First the class handling the text fields needs to be the <UITextFieldDelegate>, and to implement the <UIPickerViewDelegate, UIPickerViewDataSource> protocols.
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Final Project: eaGeier available at App Store

The eaGeier, developed as final project for the Coding Together course, is now available at the eaGeier - m2m server software gmbh .

It’s an tool for accounting on cash basis mainly used for small companies in Austria (Einnahmen-Ausgaben-Rechnung) and Germany (Einnahmenüberschussrechnung).

The app is a local port from the server application at www.ea-geier.at.

A demo of the app is available at YouTube.

Lessons learned from eaGeier #5

Setting Background Color of Table Views

While setting the background color of a table view in grouped style works on the iPhone as intended, it does not show on the iPad:

        self.tableView.backgroundColor = [UIColor yellowColor];

Table Background Color @ iPhone — iPhone

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