Objective-C

Swift Project Mixed OBJECTIVE-C Create a swift project:650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M00/7C/C2/wKiom1bXsLexFGl7AAD9_MjfQos724.png "title=" screen shot 2016-03-03 a.m. 11.34.16.png "alt="

The first type: (The simplest nsdate)NSDate* tmpStartData = [NSDate date];//You code here...double deltaTime = [[NSDate date] timeIntervalSinceDate:tmpStartData];NSLog(@"cost time = %f", deltaTime);The second type: (Put the running code in the block

What is a composite relationship? The compound relationship of a class is the most common one in the relationship of a class.A composite is a relationship with a, such as a person class that contains a member property, a book object, and

Warm so know new, continue to review.In OC, the setter and getter can be omitted by declaring attributes, which makes the code concise. When using attributes, it is not necessary to declare the instance variables in the interface and M files and to

Tip: The previous more commonly used 1, the creation of String instance method:?-(Instancetype) Initwithformat: (nsstring*) format formatted to generate a string object? This method is more commonly used, powerful, and uses: [[NSString

　　 Compounding : Combining multiple components together to form a whole and then work with the whole, which is called a compositeThe overall function is more powerful after compoundingWrite a house class, composed of doors, windows and so on, doors

------Android Training, Java training, look forward to communicating with you! ----------1. Strong pointer: By default all pointers are strong pointers, keyword __strongWeak pointers: __week keyword-decorated pointers2.ARC: The compiler will

Original address:http://tech.glowing.com/cn/objective-c-runtime/Hara GupengIf there is infringement, please contact me to deleteObjective-cObjective-c extends the C language and joins the object-oriented and Smalltalk messaging mechanisms. The core

Classes are the core of objective-c, and objective-c programs are all around classes. The OBJECTIVE-C program consists of at least the following three parts:1. Class Interface: Defines the data and methods of the class, but does not include the

Can you send a message to CGRect? The answer is no, can only send messages to Objective-c object,CGRect is a struct, so no! define several conceptsreceiver(message receiver): Pointer to the object that executes the methodselector(selector): Method

1. Trigonometric FunctionsDouble sin (double); sineDouble cos (double); cosineDouble tan (double); tangent2, Inverse trigonometric functionDouble asin (double); Results between [-PI/2, PI/2]Double ACOs (double); Results between [0, PI]Double Atan

#import int main (int argc, const char * argv[]){/** below is a basic type literal example */int a = 10; 10 is an integer literalfloat F = 0.5f; 0.5f is a single-precision floating-point number literalDouble d = 3.14; 3.14 is a double-precision

Dynamic bindingDynamic Typing Dynamics CheckDynamic linking dynamically linked#import int main (int argc, const char *argv[]) {@autoreleasepool {//auto-free poolNSLog (@ "Hello world!"); Want the console output string}return 0;}1 Import header file

Chain programming thought chain programming is whatChained programming is to connect calls to multiple methods using DOT syntax to make the code more concise and more readableFirst Contact chain programming is masonry, it's really cool to use.

Contrast with C # references: ? C# Objective-c file . CS is the source file Band. Designer is view . h is the header file .

Protocol protocolProtocol: Used to declare a method1. Definition of the Agreement@protocol Agreement name Method declaration List ....@end2. How to comply with the agreement1> Class Compliance Agreement@interface Class Name: Parent class name @end2>

As alocal variable:returnType (^blockName)(parameterTypes) = ^returnType(parameters) {...};As a Property:@property (nonatomic, copy) returnType (^blockName)(parameterTypes);As amethod Parameter:-

Special types of wrapper classes: arrays, structs (internal OC, custom), pointers1 //2 //main.m3 //05-nsvalue4 //5 //Created by Ma C on 15/8/17.6 //Copyright (c) 2015 BJSXT. All rights reserved.7 //8 9 #importTentypedefstruct One { A Char*name; -

The difference between atomic and nonatomic: Atomic: When setting the @property property of a member variable, the default is atomic, which provides multithreading security. Because of multithreading, all objects in the operation of the member

1 //Complex.h2 //03-Dynamic binding3 //4 //Created by Ma C on 15/8/11.5 //Copyright (c) 2015 BJSXT. All rights reserved.6 //7 8 #import9 Ten @interfaceComplex:nsobject One@property (nonatomic,assign) cgfloat real;//Real Department A@property