3. Development language : As a C# developer, you may already know that the so-called "#" actually represents four plus signs, that is, C# is equivalent to C++++. So C# is closely related to C and C++, but there are many improvements in genes. And Objective-C, literally speaking, belongs to the same family as C, but when you read a section of Objective-C source code yourself, you will find the gap between ideal and reality. Because in fact, Objective-C is an evolution of Smalltalk 80, which you have rarely heard of.
4. Framework class library : As C# developers, we are algeria mobile phone number list happier than C/C++ developers. Because .NET Framework has provided us with a rich class library. For example, processing XML, HTTP requests, etc. can be done very simply by calling the API in the relevant class library. In iPhone, we also have a class library, namely Cocoa Touch (to develop applications on Mac OS X, we need to use the class library Cocoa, and on iPhone/iPad, we use Cocoa Touch. The relationship between the two is similar to that between .NET Framework and .NET Compact Framework). Quickly mastering the functions provided by the framework class library is also an obstacle we must overcome.
5. Deployment Platform : I believe that some readers of this book have experience in Windows Mobile development. Although the deployment platform of this book is also a mobile operating system, it is very different from Windows Mobile. The biggest difference is its single-task processing mechanism, which may drive you crazy in the early stage. For those readers who have not been exposed to Windows Mobile development, iPhone development is also very different from your original deployment platform.