iPhone App Development using iOS 4 SDKs

iPhone SDKs are designed for apps where software portability across a range of different platforms is desired. This is important if you are writing an app or service that a network provider plans to deploy to a selected set of platforms (iPhone, Ipad etc).  To achieve this portability, the SDKs use a high level of abstraction. The trade-off is that the high-level SDKs limit the amount of control the dev has over the human interface's look and feel. This enables the underlying implementation of the UI SDKs, which is done by the Apple, to be adapted appropriately to the human interface on the device's hardware and native user interface style, ensuring a consistent user experience between the native apps and the Apple store profile apps. The actual drawing to the MIDs display is performed by the device implementation. The implementation also controls the visual appearance (e.g., shape, colour, font, etc.) of the components and encapsulates navigation, scrolling, and other basic interactions. Typical apps using a highlevel SDK are stock transactions, travel reservations, online purchase of concert tickets, news headlines, weather updates, and traffic information.