[Reading Notes] iOS-memory management, ios-memory management

[Reading Notes] iOS-memory management, ios-memory management Cocoa memory management: retain, release and autorelease. Each object maintains a reserved counter. When an object is created, its reserved counter value is 1; when the object is

UIButon controls zoom in and out (you can also think of them as image zoom in and out, the idea is the same)-learning notes, uibuton zoom in and out

UIButon controls zoom in and out (you can also think of them as image zoom in and out, the idea is the same)-learning notes, uibuton zoom in and out A simple implementation of the Image zoom-in and zoom-out function (taking a simple guess image

What does copy mean?

What does copy mean? 1) For non-container objects such as NSString and NSNumber NSString * str1 = @ "abc ";NSString * str2 = [str1 copy]; // The address is the same as that of Str1.NSString * str3 = [str1 mutableCopy]; // The address is different

IOS-Address Book, ios Address Book Development

IOS-Address Book, ios Address Book Development1. Overview: * For every mobile device, there is a built-in database ----- address book. * On IOS, the address book is stored in the SQLite3 database. * Because different applications cannot access the

[Reading Notes] iOS-object initialization, Reading Notes ios-

[Reading Notes] iOS-object initialization, Reading Notes ios- 1. Allocate objects. Allocation is the process of the birth of an object. The best time is to get a piece of memory from the operating system and specify it as the location of the

Use UIScrollView to switch between several pages.

Use UIScrollView to switch between several pages. This example shows how to use UIScrollView and the table and page Jump content; Original Author address: http://www.cocoachina.com/bbs/read.php? Tid = 323514 As follows:   1: use of the knowledge

Third-party map of iOS-AMAP (navigation sdk Path Planning), ios AMAP

Third-party map of iOS-AMAP (navigation sdk Path Planning), ios AMAP AMapNaviManager class is used to obtain travel information through Path Planning of amapapnavimanager. Then, call the following method: /*! @ Brief: calculates the coordinates of

IOS open-source projects and githubios open-source projects worth attention on GitHub

IOS open-source projects and githubios open-source projects worth attention on GitHub 1. AFNetworkingAddress: https://github.com/AFNetworking/AFNetworkingUsed for network requests 2. JSONKitAddress: https://github.com/johnezang/JSONKitParse JSON 3.

UIStepper, iosuistepper

UIStepper, iosuistepper // Initialize stpper with a fixed sizeUIStepper * step = [[UIStepper alloc] initWithFrame: CGRectMake (100,100, 0, 0)];// Set the minimum and maximum valuesStep. minimumValue = 1;Step. maximumValue = 30;// Set the value

Free bridging in iOS and free bridging in iOS

Free bridging in iOS and free bridging in iOS Excerpted from iOS 6 programming practices. Unlike the Objective-C library, the standard C language and Core Foundation Class Library (CF * method) in Objective-C do not follow those naming conventions.

There is no NavigationBar to a pitfall when there is a NavigationBar view switch, navigationbar View

There is no NavigationBar to a pitfall when there is a NavigationBar view switch, navigationbar View NavigationController is the most common in iOS apps. It can be said that it is essential for every App. Since iOS7, the system's built-in

IOS-MVC design mode, iosmvc

IOS-MVC design mode, iosmvc MVC design pattern Overview: Model-View-Controller (MVC), that is, Model-View-Controller. It divides the software system into three parts: Model, View, and Controller. MVC Functions M (model) The core of an application,

Review-singleton mode, review-Mode

Review-singleton mode, review-Mode 1. Singleton) * Ensure that only one object is created for a class. 2. Role * Saves memory overhead. * If some data is used in the entire program, you only need to use the same resource (ensure that the data

IOS --- loadView Use Cases in UIViewController

IOS --- loadView Use Cases in UIViewControllerProblem First read the code and create a subclass TestViewController (including the nib file) of UIViewController. imageViewCourse and lbCourse are two attributes of this class, which are added through

OS --- display the Splash page with scheduled tasks in Swift

OS --- display the Splash page with scheduled tasks in Swift We use Swift to display the Splash page, but it is not enough to only display the Splash page. We need to display the Splash page for 2 seconds and then jump to the next page. Therefore,

Differences between nil, Nil, and NULL in iOS, iosnil

Differences between nil, Nil, and NULL in iOS, iosnil 1. Description Nil: a null pointer to an object in oc Nil: NULL pointer to class in oc NULL: pointing to other types of NULL pointers, such as a c-type memory pointer NSNull: an object that

IOS development diary 18-runtime advanced, ios diary 18-runtime

IOS development diary 18-runtime advanced, ios diary 18-runtime Today, the blogger has an advanced runtime requirement and encountered some difficulties. I would like to share with you the hope to make common progress. I believe that after reading

Mac iOS Json operation Model to JSON, iosjson

Mac iOS Json operation Model to JSON, iosjson In the mobile Internet era, json has become the mainstream data exchange format. It is essential for developers to easily and quickly create, convert, and transmit json files. Fortunately, we live in the

Custom tabbar label bar and custom tabbar label

Custom tabbar label bar and custom tabbar label Since I learned iOS, I feel that custom things are easier to operate than those that come with the system, and there is more space for modification and execution. The following describes how to use

Chapter 52 API and API design notes and api52 notes

Chapter 52 API and API design notes and api52 notes Chapter 52 API and API design notes Article 15th: Use a prefix to avoid namespace conflicts Objective-C does not have the built-in namespace mechanism in other languages. In view of this, we should

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