cocoa objective c

running test code appears red bar; Modify the product code, and then run the test code to appear green bar(ii) Object-oriented three elements1 , abstract(1) The abandonment of the appearance factors of things and the extraction of essential factors(2) The abstract ability of "refine, simplifying, Youbiaojili and seeking for the same" determines programmer's program design ability(3) Taking out the essential features of things and not considering their details for the time being(4) Abstraction i

capabilities. Abstraction is a matter of extracting the essential features of things and not considering their details for the time being. For complex system problems, we can solve problems by means of hierarchical abstraction. At the highest level of abstraction, the solution of the problem is described in a generalized way, using the language of the problem environment. In the lower layers of abstraction, they are described in a procedural way. When describing a problem solution, use a proble

conditionstestException,We add a use case to test the boundary condition testBoundary ,How to get JUnit gree bar out and try it out, such as:Regardless of TDD, writing high-quality test cases is the most important, how to do unit testing, you can refer to the "Unit test of the road" this book. In addition, "Agile Java Chinese version" shows how to integrate Java and TDD effectively, through TDD Drive project development, interested can be consulted.(2) encapsulation, inheritance and polymorphis

being. For complex system problems, we can solve problems by means of hierarchical abstraction. At the highest level of abstraction, the solution of the problem is described in a generalized way, using the language of the problem environment. In the lower layers of abstraction, they are described in a procedural way. When describing a problem solution, use a problem-oriented and implementation-oriented terminology.In program design, abstraction consists of two aspects, one is process abstractio

coding rhythm of TDD is:• Add test code, JUnit appears red bar• Modify the Product codeJUnit appears green bar, mission accomplished(ii) Object-oriented three elements1. Abstract(1) The ability of "refine, Youbiaojili and seeking for the same in different"(2) Process abstraction, data abstraction2. Encapsulation, inheritance and polymorphism(1) Object-oriented three elements: encapsulation, inheritance, polymorphism.(2) Object-oriented thinking involves all aspects of software development, such

(50,30) 7. Check whether the rectangle contains a point CGRect enemyrect = CGRectMake (0, 0, MB); Cgpoint hitPoint = Cgpointmake (m); if (Cgrectcontainspoint (Enemyrect, hitPoint)) { //yes! } 8. Check whether the two rectangles intersect CGRect playerrect = Ccrectmake (in); CGRect Minerect = CGRectMake (a); if (Cgrectintersectsrect (Playerrect, minerect)) { //ouch! } 9. CGRect and NSString conversion CGRect rect = CGRectMake (0, 0, MB); NSString *rects

find that the information you need is exhausted, but you cannot obtain the information again because you didn't reference the OBject, even if you reference an object, the information is not public. Obviously, you will spend several days identifying code changes. UML helps you get rid of the following dilemmas: the code accumulates with the increase of details, so you can find out which are the basic elements of the system, it is difficult to understand the relationships between objects and how

determine the object of communication between the message; (4) The message pattern of the design object, the message pattern and the processing ability together constitute the external characteristics of the object; (5) Analyze the external characteristics of each object, classify objects with the same external characteristics into one class, and determine the required classes; (6) To determine the inheritance relationship between the classes, the public nature of the objects in the upper class

) Determining the operation to be applied to each object, i.e. the inherent processing power of the object;(3) Analysis of the relationship between the objects, to determine the object of communication between the message;(4) The message pattern of the design object, the message pattern and the processing ability together constitute the external characteristics of the object;(5) Analyze the external characteristics of each object, classify objects with the same external characteristics into one

development, such as object-oriented analysis (OOA), Object-oriented design (OOD), and object-oriented programming (OOP). OOA decomposes The system according to the abstract key problem domain and focuses on what. The main line that runs through OOA, Ood, and OOP is abstraction.Ood Modeling uses the graphical Modeling language UML (Unified Modeling Language), UM

, abstraction consists of two aspects, one is process abstraction and the other is data abstraction .Example:Can print out "1,2,3,4", want to hit "the" How to do? Most of the practice is to copy the above code and add one more line:Want to print out "1..100" what to do? These two pieces of code have three lines of duplicate code, violating a common programming principle dry (Don ' t Repeat yourself), the solution is to process the abstraction , write a function printn:The previous two-segment co

. According to this point of view, the details about object attributes and services are not considered in OOA, and they are put into the West Lake in the OOD stage, such as the Berard method and Rumbaugh method both adopt this division of labor. Another point of view is that the analysis only targets problems and system responsibilities, and establishes an OOA model independent of implementation without con

Software engneering Computer Aided Software EngineeringUIMS = User Interface Management SystemDSC = demo-support center Decision Support CenterSmop = Small natter of progamming Units small program UnitNote: 1 smop = half a programming Day (4 hours); 1 week = 32 programming hours. OOA = Object Oriented Analysis Object-Oriented AnalysisEvaluate user needs and problems to be solved. The output provides a conceptual design for the static, dynamic, and fu