This is unlikely (read: almost impossible). The iPhone SDK and Xcode development tools are designed to run on Mac OS X with Intel x86 processors. The iPad processor is an 1 GHz ARM processor. This is a different architecture and inadequate for the effective use of these tools. (This may change if Apple can and wants to develop a version of these developer tools initially for iPhone OS with sufficient performance).
You can use a text editor on the iPad to write code, but you can hardly compile, test, and debug it.
, , gcc iPhone OS ( iPhone iPod touch). Apple, Interface Builder, Objective-C .