Objective-C

Build OBJECTIVE-C development environment under Windows environmentFor now, if you really want to use Xcode to run the OBJECTIVE-C program, then you can use the virtual machine to install Mac OS X or a black Apple (installed on the PC on the Apple

Classification:The main is to add some methods to the original class; You cannot add member variablesPerson (person+eat)Informal agreements:The informal agreement is the category, that is, the category that is added to the class in the framework of

Detailed description of UIButton:One, the button has the properties:@property (nonatomic,readonly) Uibuttontype ButtonType; Button type@property (Nonatomic,readonly,retain) NSString *currenttitle; Button Current text@property

The Objective-c class in the core processing string is NSString and nsmutablestring, the biggest difference between the two classes is that the content and length of the string cannot be changed dynamically after nsstring creation of the assignment,

Toolbar: ToolBarToolbar item: Bar Button Itemfixed adjustment of the adjustment button position: fixed Space Bar button Itemflexible adjustment of the adjustment button position: Flexible Space Bar button The toolbar toolbar is a property of the

———————————————————————————————————————————Multiple object memory management (wild pointers & memory leaks)(Note: This part of the knowledge should be combined with "single object memory Management" to understand)This part of the knowledge is

Stepping Uistepper, sliding block UISlider: When they are triggered as events, their values change. Because of this, when the event is triggered, you can flip through a picture,,,Stepping Uistepper:@property (nonatomic) double minimumvalue; Default 0

NSBundle Introduction: It is a singleton class that is used to load resources (2011-09-22 17:51:37)reproduced Tags: gossip Category: IOS A bundle is a directory that contains the resources that the program will use.

First, UIView Common Properties (1) @property (nonatomic,readonly) UIView *superview; Gets its own parent control object (2) @property (nonatomic,readonly,copy) UIView *subviews;//gets all of its child control objects (3) @property (nonatomic) The

Inherited What is inheritance? What are the advantages and disadvantages of inheritance?Inheritance refers to the properties and methods of an object that directly use another object.Inheritance needs to conform to the relationship: is-a (e.g.

The next thing I'm going to talk about is compounding.Learning with questions will be quickerWhat is a compound? What are the advantages? When do you use the compound? What is a dependency relationship? How to solve?Compounding is the combination of

SummaryAs long as we use objective-c, we deal with method calls every day. We all know that the method of OBJECTIVE-C resolution is dynamic, but in the bottom of a method is how to find, how the method cache and how the operation is little known.

Method One:NSString *str = @ "ABCDEFG";nsmutablestring *reversestring = [nsmutablestring string];for (int i = str.length-1; I >= 0; i--) {char c = [Str characteratindex:i];[ReverseString appendformat:@ "%c", c];}NSLog (@ "%@", reversestring);Results:

The content size of the variable group Nsmutablearray is variable, so its common operation is nothing more than adding and removing the check,Some of them are: Create, add, delete, replace, insert, empty, etc...//Main.m02-nsmutablearray//Created by

The primary operation for nsmutablestring mutable strings is to create, add, delete, insert, replaceThe code operates as follows:1 //2 //main.m3 //03-nsmutablestring4 //5 //Created by Ma C on 15/8/17.6 //Copyright (c) 2015 BJSXT. All rights reserved.

Foundation frameworkNSString, Nsmutablestring, NSNumber (Basic data Type wrapper class), Nsvalue (special type wrapper class: pointer, array, struct), Nsarray, Nsmutablearray, Nsdectionary, Nsset and so on. one, immutable string NSString

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

The UI elements (buttons, lists, pictures ...) that we can see on the screen when we use the app, which we call views, are inherited and UIView, they usually have properties such as location, size, background color, and in Appl View and window show

Three ways to import files are compared:@class, import, include in the preceding paragraph of the class:1, the use of @class class name, it will tell the compiler has such a class, currently do not need to know its internal instance variable and

Retention of objects and release of ownership:int main (int agrs,char *argv[]) {@autoreleasepool {Person *person = [[Person alloc]initwithname:@ ' Tom ']; Retaincount=1[Person Setname:name]; Retaincount = 2;[person release];}} @interface