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In the development of iOS client applications, it is often necessary to download pictures from the server. Although the system provides download tools: NSData, NSURLSession and so on, there are many factors to consider in the process of downloading pictures, such as asynchronous download, image caching, error handling, coding and decoding, and ...

Last article Start developing iOS 10 - 21 with Swift using WK WebView and SFSafariViewController Learn how to open a web page. This article learns to use CloudKit. iCloud was originally released by Jobs in WWDC 2011 to allow Apps and games to store data in the cloud and automatically synchronize data between Mac and iOS. In recent years, it ...

background Developer feedback system is particularly slow to execute a stored procedure, which is checked because of the need to insert a large amount of data into the new task table during the execution of the stored procedure. The primary key of the task table is clustered index. Why does clustering index cause slow insertion? How much impa ...

In the process of iOS development, one of the commonly used technologies is APP to upload pictures. Although this knowledge point is not difficult, the needs of uploading pictures are different. For example, sometimes you need to select a specified number of photos at the same time in the album at one time, and the number of selected pictures ...

Baidu Hawk Eye The official integration instructions of Eagle Eye + Map Baidu are very detailed, but there are still several pits that do not know the series. I'm using the Eagle Eye V3.0.3 version here. List a few pits I stepped into in the integration process. Eagle Eye Trajectory itself is only responsible for collecting and displaying th ...

NSFontAttributeName (Font) The value corresponding to this property is a UIFont object.This property is used to change the font of a piece of text.If this property is not specified, it defaults to 12-point Helvetica(Neue). NSParagraph StyleAttributeName (Paragraph) The value corresponding to this property is a NSParagraphStyle object.Thi ...

brief introduction When we have more and more functions, the volume of a single file becomes larger, even bloated. When many people cooperate to develop a document, there will be many conflicts. At this time, we need to use the corresponding solution, that is category. This article will proceed from several directions to understand the implemen ...

This control does not depend on any parent layout, not for Recycler View, ListView, and child View in any ViewGroup can use the Side Slide (Delete) menu.  Simple, 0-coupled, supports any ViewGroup. Summary It has been 7 months since the control came out and has been used in the project. It has been 2 months since the first push ...

Introduction: Review of the previous part: In ARKit( Light and Animation Processing To use Objective-C to open an AR project in a normal project, realize a demo of solar system, realize the rotation and rotation of the sun, including the relationship between each node, who is the child node of each node, set up the Earth-Moon node, then add th ...

chart Basic concepts Subgraph Induced subgraph group Minimum staining Maximum Independent Set Minimum Cluster Coverage Two conclusions Chordal graph concept string Chordal graph Two conclusions Decision of Chord Graph Simple point Perfect elimination sequence algorithm CDQ God's Speech: Chord Diagram and Interval Diagra ...