oc cox

Ios development: Memory Analysis of OC objects and oc objects for ios development Recently, I am about to start looking for an intern. I have prepared some pen-based questions, read the interview experience of the experts, and found that I still have many things to learn. Although I have done several projects, however, after reading the pen test, I found that I did ignore the basics, So I recently started

OC learning --- copying objects, oc --- copyingIn the previous article, we talked about how to solve the circular reference problem of objects. However, OC is more inclined to Java. If an object in OC needs to be copied, it needs to implement the Protocol: We can see from the name that a protocol is used for immutable

The first OC class and the first oc class The class only has three relationships: 1. Name (Class Name): the first letter is in upper case. If the name is composed of multiple words, the following words follow the hump principle. 2. attributes: generally starting with an underscore 3. behavior (method): the first letter is lowercase, followed by the hump Principle Class declaration: 1. Role: Declares the at

I. INTRODUCTION of OC(i), the origins of Objective-c and CBorn in the 1980s, Objective-c was invented by Brad Cox to combine the popular, portable C language with the elegant Smalltalk language.Objective-c is an extended set of C languages that, based on the C language, adds subtle but significant features to the language.Apple's iphone platform uses objective-c as the development of native language, Object

[Learning notes] [oc] pointer, learning notes oc 1. Take the value of a variable, either directly or indirectly Direct: Access variable Indirect: obtains the value of the variable through the memory address of the variable. The variable that stores the memory address is the pointer variable. 2. syntax for defining pointer variables: type * variable name : Obtains the address operator and the memory address

OC memory management summary, clear and clear !, Oc Memory Management Summary How can I improve my speech ability? For example, if I want to describe one thing, how can I give a simple and clear description to the other party? I teach you: I rely on it! (Although there are only two words in this reply, it deeply expresses the deep blessings and deep feelings of the respondent. It is concise and concise, w

your plist file less added something, together to send up;　　Here is the choice of one, I have chosen to run in the background, you can choose another property, use time to run, as for key I do not remember. I can find it in Baidu Map Forum.Here incidentally, after the iOS9, Apple opened ATS, the service is actually need to support HTTPS, it is estimated that Apple's goal is to reverse force developers to enhance their security, but sometimes the company does not want to spend money to buy the H

Nil Nil NULL Nsnulnil: null pointer to object in OCNil: null pointer to class in OCnull: Pointer to a different type of null pointer, such as a C -type memory pointerNsnul: An object that represents a null value in a collection objectif obj is nil:[obj message] will return no, not nsexceptionif obj is NSNull:[obj message] Throws an exception NSExceptionOC Exception Handling:cup *cup = [[Cup alloc] init];@try {[Cup fill];}@catch (NSException *exception) {NSLog (@ "Main:caught%@:%@", [exception na

OC reflection --> dynamic creation class, oc -- Create a Class 1-(Class) createNewClass {2 const char * className; 3 className = [@ "Student" UTF8String]; 4 Class kclass = objc_getClass (className ); 5 // determine whether this class already exists. if it exists, it will return. if it does not exist, it will create 6 if (! Kclass) 7 {8 Class superClass = [NSObject class]; 9 kclass = objc_allocateClassPair (

[Oc learning diary] Singleton mode, oc learning Diary First, let's take a look at the concept of Singleton mode. The Singleton mode ensures that only one object (only one address) exists in the system. The following is an example of a student. To ensure that there is only one object in the system, you must override the object creation method and object COPY method. 1 # import Next, let's look at the imple

[OC learning-13] What is a combination and Its Relationship with inheritance ?, Oc-13 Inheritance has two disadvantages: (1) when there are more and more layers, if each level has instance variables, the instance variables inherited by the lower classes will be too many and heavy; (2) when a message is transmitted from a subclass to a higher level, the higher the level, the lower the efficiency. So there i

Class instantiation and method call in oc, oc instance callIn the previous article, we talked about the creation of oop and classes. In the previous article, we will review this article to implement class instantiation and call public parameters and methods in the class. The implementation of the class is in. in the m file, the following is the implementation code: /// HuiTu. m // Test // Created by Cheng Y

One-sentence OC Singleton mode and one-sentence OC Mode Create a new header file and define the following macro: 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495 // Implementation of. h file#define SingletonH(methodName) + (instancetype)shared##methodName;// Implem

IOS development-OC language (5) dictionary, ios-oc Dictionary Key knowledge points: 1. NSDictionary class 2. NSMutableDictionary class 3. Understand the inheritance relationship between NSMutableDictionary and NSDictionary 4. Supplement: Hashed storage: Also known as hash Storage, is a search technique that tries to establish a ing between the storage location of data elements and key codes. The basic idea

Variable string NSMutableString and OC variable string for learning through the "snil-oc" command NSMutableString inherits from NSString, so all NSMutableString methods of NSSting are inherited and can also be used The following two methods are not available in NSString: // Variable string related methods Several small programs on variable string Methods This is the string method. As the teacher sai

Basic OC framework-dictionary type and basic oc framework dictionary Category: NSDictionary (unchangeable data dictionary) and NSMutableDictionary (variable data dictionary) Composition:(1) A data set composed of Key-Value pairs (2) Any object (id type) can be used as a key, but it is generally a string (3) The elements in the dictionary are unordered, and the elements with the same keys cannot be repeated

Reference count for memory management problems in OC and oc Memory Management Define a Person class In fact, the reference count problem can be understood as a house rental problem. If retain alloc is used to represent the person who rented the big house and obtained a key, the reference count indicates the total number of keys in the house, release indicates the return key for check-out Person * p = [[Pe

OC basics -- passing parameters of objects between methods, oc -- Description: U. S. soldiers fought for help after they took Hanyang Building 5 bullet clips (5 bullets in each clip) and carried them together Class: Soldiers: Attribute: name (_ name) height (_ height) weight (_ weight) Action: fire (callForHelp) Gun: Attribute: Number of cartridge clips (_ clip) (_ clipNum) brand (_ model) Behavior: Change

OC basics-encapsulation of member variables, oc-encapsulation of Variables # Import # Import "School. h "@ implementation School-(void) introduction {NSLog (@" School name: % @, School Address: % @, created: % I, % I, % I ", [self name], [self address], [self createTime]. year, [self createTime]. month, [self createTime]. day) ;}@ end # Import If the member variable is public, the value assigned to the me

Implementation of the OC Singleton mode and the OC Mode SingleClass. m # Import Main. m int main(int argc, const char * argv[]) { @autoreleasepool { SingleClass *s1 = [SingleClass shareInstance]; SingleClass *s2 = [SingleClass shareInstance]; SingleClass *s3 = [[SingleClass alloc] init]; SingleClass *s4 = [s1 copy]; NSLog(@"%p",s1); NSLog(@"%p",s2);