Objective-C

1 "Set method memory management related parametersRetain//release old value, retain new value (for OC pair image type)Assign//Direct Assignment (default parameter, for non-OC objects)Copy//release old value, copy new value2 "whether to generate

The Uitextfield class does not have a maximum length attribute and needs to be set through delegate.1. Inherit the Uitextfielddelegate interface.@interfaceMYClass () @end2. Set the interface.// timesField: 初始化的UITextField[timesField setDelegate:self/

Overview NSNumber and Nsvalue are used for boxing purposes, and the basic types of data are loaded into objects. The information given in the official documentation is clearly stated:/*nsvalue.hcopyright (c) 1994-2014, Apple Inc. All rights

Createfileatpath//Create File Nsfilemanager *FM = [Nsfilemanager Defaultmanager]; NSString *strpath = [NSString stringwithformat:@ "%@/file1.txt", Nshomedirectory ()]; NSString *strdata = @ "Test"; BOOL BRET = [FM

In fact, with the C language and Java,oc is also a switch multi-branch statements, can also be called switch statements. The syntax is also very similar. Let's take a slow look at switch.(a) Code one:int main (int argc, const char * argv[]) {

Description method#import "Person.h"@implementation Person- (void) Setage: (int) Age {_age=Age ;}/** Determines the output result of the instance object **/-(NSString *) Description {return[NSString stringWithFormat:@"age=%i", _age];}/** Determines

Article Source: http://onevcat.com/2012/04/objective-c-runtime/If reproduced please specify the source, the ultimate original copyrightIn-depth objective-c dynamic characteristicsObjective-c has quite a lot of dynamic characteristics, basic, is also

In the Cocoa Foundation, nsdictionary and Nsmutabledictionary are used for an ordered collection of objects, Nsdictionary and Nsmutabledictionary and Nsarray and Nsmutablearray are not the same, the former can hold several different types of data,

Nsdictionary *daiwei = @{@ "name": @ "David Beckham",@ "Age": @ "38",@ "Gender": @ "true",@ "Wife": @{@ "name": @ "Victoria Beckham",@ "Age": @ (39),@ "Team": @ "Spice Girls"},@ "Children": @[@ "Brooklyn", @ "Romeo", @ "Cruz", @ "Harper"]};from

First, the concept:Object-oriented provides inheritance syntax that can greatly simplify code. The common methods and instance variables are written in the parent class, and the subclass words need to write their own unique instance variables and

Example one (similar to c)//1. Code Writing//like the C language, the entrance to the OC program is still the main function, except that it is written in a. m file. For example, here is a main.m file (the file name can be Chinese)#include intMain ()

Http://www.cocoachina.com/ios/20150617/12148.htmlOverviewSince the launch of the WWDC 2015 and the Open source Swift 2.0, everyone's enthusiasm for Swift has soared again, while the envious startups ' friends talk about Swift's new features, as well

OBJECTIVE-C code block multiple concurrency1. The code block object is an extension of a function in the C language, except for the code in the function, which also contains a variable binding, and the code block is sometimes called a closure2. The

Protocol (@protocol): interface equivalent to JavaProtocol methods are not necessarily implemented, you can use @required and @optional to set, the default is @required (ob is weak syntax, even if you do not implement the required method compile run

Artifice refers to a skill and a product that is too kit and useless.Reprint please specify the source http://blog.csdn.net/uxyheaven/article/details/46391771We can define basic operators and types with macros.#define 加 +#define 减 -#define 乘

It is well known that memory management in Objective-c is managed through a mechanism called "reference counters".For example, when I declare a new instanceNSData *data = [[NSData alloc] init]Now, there is an object of type NSData in memory called

Inheritance, initialization method, convenience builderToday we are going to learn to inherit the initialization method and Traverse The constructor first we have to understand some conceptual things . Inheritance : In oc , inheritance is a single

Objective-c, usually writing OBJC and less used Objective C or OBJ-C, is an object-oriented programming language that expands C. It is mainly used in Mac OS X and GNUstep, which use the OpenStep standard system, and it is the basic language in

1. How to create a controller1.1. There are several common ways to create a controller:1.1.1: Created by storyboard1.1.2: directly create *viewcontroller = [[Yhviewcontroller alloc] init]; //1.1.3: Specify the Xib file to create *viewcontroller= [[

In the previous article, we introduced the class-and object-related content in runtime, and from this chapter we will discuss the content of class implementation details, including the implementation of member variables, properties, methods,