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Dependency Inversion Principle Previous Principle: Interface Segregation Principle High-level modules should not depend on low-level modules. Both should depend on abstractions. When designing a system we have low level classes (classes which implement primary operation like: Network access, Disk access, Database access) and high level classes which have business logic. High level classes are dependent on Continue Reading »
Interface Segregation Principle Previous Principle: Liskov’s Substitution Principle A client should never be forced to implement an interface that it doesn’t use or clients shouldn’t be forced to depend on methods they do not use. In OOD we provide abstraction to module using interfaces, so we create an interface for a module and an implementation class. Continue Reading »
Liskov’s Substitution Principle Previous Principle: Open Close Principle Let q(x) be a property provable about objects of x of type T. Then q(y) should be provable for objects y of type S where S is a subtype of T. All it is saying that, Any method which is using a reference of base class can use Continue Reading »
Open Close Principle If you have not read Single Responsibility Principle Start from here Single Responsibility Principle Classes should be open for extension, but closed for modification This principle states that any new functionality can be added in a system with minimum modification in the current code. Means the system should be open to additions but it should Continue Reading »
Object Oriented Design Principles A good design is most important step of Software Development life cycle, and to have a good design we must follow some set of guidelines. According to Robert Martin in “Agile Software Development: Principles, Patterns, and Practices” there are 3 main reasons of bad design that should be avoided: Rigidity – System Continue Reading »
Hello, folks. In this post we are going to implement a reusable component for freehand drawing. We will see how to use `UIGestureRecognizer` for drawing and using linear polarization to make our drawing smooth. We will also create a method to draw an arrow with respect to two points. So let’s start with creating a Continue Reading »
The brand new iOS 7 is about to release (18th Sep) and are some major User Interface changes. In fact, Engineers at Apple completely re-did the user interface. The new UI is clean, simple yet amazingly efficient. The animations are subtle yet intuitive. The use of translucency gives user the sense of the context. New Continue Reading »
In this world of “quick app” development, the importance of ‘user experience design’ is undermined. Mobile solutions are all about experiences, and we design experiences at InnovationM. Anybody can create a set of screens on mobile (there is an SDK available!) but when that app goes in the hand of the user, is it simple, intuitive and pleasing enough for the user Continue Reading »