IOS

Graph in iOS development-Quartz2D-  What is Quartz2D? Quartz 2D is a two-dimensional Drawing Engine that supports both iOS and Mac systems.Function Quartz 2D can complete the work of drawing graphics: line, triangle, rectangle, arc, draw text draw

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

(Conversion) in Xcode, configure ARC support for some files, xcodearc What is ARC? ARC is a new feature launched by iOS 5, which is called Automation Reference Counting ). Simply put, the retain/release is automatically added to the Code. The Code

IOS development pull-down refresh and pull-up loading more, ios LoadingIOS development pull-down refresh and pull-up loading more 1. Introduction to common pull-down refresh and pull-up loading more implementation methods (1) UIRefreshControl (2)

Daily and weekly iOS reminders // Update the prompt at every day -(Void) alertByDay { NSDate * date = [NSDate date]; NSCalendar * calendar = [NSCalendar currentCalendar]; NSDateComponents * comp = [calendar components :( NSHourCalendarUnit |

Common iOS design patterns-Observer Design PatternsObserver Design Patterns Observer Design Pattern description basic concepts nsicationicationcenter use add listener receive message deletion monitoring KVO use basic concepts register observer

IOS development-Stage 3-Weibo (2) (Weibo MVC) and iosmvc   MVC design pattern Design Model: Experience, methods, and tools summarized by the predecessors Delegate, observer, Singleton Factory Model-View-Controller Design Patterns widely used in iOS

Object-c SQLite database memory overflow problem, object-csqlite An application is being developed recently. There are many places in the application that use the SQLite database. Some downloaded content is cached in the SQLite database. A serious

C language basics of iOS development Lesson-07 structure class notes and exam exercises, ioslesson-07 1 /////////// Lesson 07 structure class notes ///////// // 2 // struct function: 1. is a custom data type, which can be used to define variable 3 //

Ios multi-thread operation-GCD scheduling GroupThere is such a need to execute two time-consuming asynchronous operations, and then return to the main thread to execute the operation after the two asynchronous operations are completed. If you want

# Define collection commonly used in iOS1. When defining constants and defining constants, it is best to start with a lower-case letter k to let people know what they mean. (1) Navigation Bar Height: We all know that the height of the navigation bar

IOS can obtain the network type in four ways, and ios can obtain the network type in four ways. ReachabilityOnly the WIFI and WWAN types can be distinguished, but the 2G and 3G networks cannot be distinguished. There are also some methods on the

--- Using SQLite in Swift, --- swiftsqlite SQLite. swift is an operating framework that uses the pure Swift language to encapsulate SQLite3. Features: Simple query and parameter binding Interfaces Secure and Automatic Data Access Implicit commit

IOS development and learning processThe following is a brief introduction of how I feel about iOS development. It is also an architecture for learning iOS development. 1 iOS development environment 1.1 The standard configuration of the development

IOS/Swift pause and resume layer animation, iosswift Code for starting layer Animation: // MySuperLayer parent layer CFTimeInterval pausedTime = [self. mySuperLayer timeOffset]; if (pausedTime> 0) // you can use {self. mySuperLayer. speed = 1.0;

Sandbox mechanism of IOS, iossandbox Every App in IOS has a separate closed folder called sandbox, and Apple requires that no App can access the sandbox of other apps. Sandbox directory FOUNDATION_EXPORT NSString * NSHomeDirectory (void ); Or

Fingerprint Recognition for ios developmentFingerprint Recognition is released for iPhone 5s. The most important application area of the fingerprint recognition SDK for iOS 8.0 apple is that the fingerprint recognition function should be used for

Mac cannot ssh localhost, error prompt: bash:/usr/local/bin/ssh_session: Permission denied, sshssh_session After searching for a long time on the Internet, I did not find a solution. Finally, I tried the following as prompted: 1. Edit the/etc/sshd_

Basic iOS control (lower) and basic ios Control The previous section describes UIButton, UILabel, UIImageView, and UITextField. This section briefly introduces UIScrollView and UIAlertView.UIScrollView As the name implies, we also know that this is

The secondary expansion function of the [original] list. Extends the implementation on native UITableView ., UitableviewOr directly paste the code. Step 1: @ Interface TodoViewController () {// declare an array to store cell information