IOS

The Error domain=nscocoaerrordomain code=3840 "The operation couldn ' t be completed. (Cocoa error 3840.) " (unescaped control character around character 1419.) userinfo=0x1563cdd0 {nsdebugdescription=unescaped control character around character 1419

[Reading Notes] iOS-saving information using SQL database, ios-SQL Whether the BLOB field can be used to save images is a good method is still controversial, except for small images. A more common method is to save an image as a file, and then only

Core Animation-1: layer tree, coreanimation-1Tree Structure of Layers > The giant demon has layers, and the onion also has layers. Do you understand? We all have layers -- Shrek Core Animation is a misunderstanding. You may think it is only used for

[Reading Notes] iOS-handle memory warnings, Reading Notes ios-warning -(Void) didReceiveMemoryWarning { [Super didReceiveMemoryWarning]; } Here, you need to release all objects that occupy a large amount of memory. If you ignore this warning,

[Reading Notes] iOS-attributes, Reading Notes ios- Assign: simple assignment. Retain: After a value is assigned, the new retain method and the release method of the old value are called. Copy: copy the value first, and assign the copy value to

OC learning-object-oriented personal understanding, oc learning-object-oriented   1. What is object-oriented? The following is my explanation on Baidu: Object Oriented (OO) is a software development method. Object-oriented concepts and applications

[Reading Notes] memory management parameters in iOS-attributes, and ios-memory management I. assign It indicates that the value is directly assigned during the setting, instead of copying or retaining it. 2. retain. The new value is retained

A three-year or five-year IOS engineer must possess the following qualities and skills: What skills should a three-year IOS engineer possess? If you are confused, you can take a look at this article, which is a general direction. I started my

Objective-C type conversion and objective-c type conversion Type conversion usually refers to a variable, which is converted from one type to another. For example, to convert a long type to an int type Use the following method: (type_name)

Problems encountered during cocoapods installation and installation, cocoapods Process 1. $ ruby-v // check the current ruby version. My version is ruby 2.0.0p648 and earlier than 2.2. Therefore, problems may occur when installing cocoapods below. 2

IOS: iOS6 Passbook application development details, ios6passbookPassbook is a new function of iOS6 and can only be used in iPhone and iPod touch devices. It can help manage e-membership cards, credit card, and coupons issued by sellers. 1. Passbook

PCH file, pch File 1. Introduction The PCH file is a global reference shared file in Xcode programming. The header file or macro definition can be introduced here to facilitate access to multiple files in the program.   2. Create a PCH File

The scrollview layout is shifted down on iOS 11 Scrollview layout down offset on iOS 11 //// ViewController. m // # import "ViewController. h "@ interface ViewController () @ property (nonatomic, strong) UIScrollView * scrollView; @ end @

How does WebDriverAgent remotely control iOS devices ?, WebdriveragentiosStep 1 download GitHub composer topstep 2 install WebDriverAgent // Card .... // Environment variable settings ,,,, // 3 h   Note: 1. environment variables are not

IOS copies a UIView object implementation method, and iosuiview object implementation IOS copies a UIView object. A new user guide is required in the project, that is, a mask is added to a page, and a view is highlighted. My idea is to add an

IOS-UITableviewcell split line location, In the past few days, when I had to adjust the position of the split line in the list, I remembered my previous practice: Hide the split line and add a UIView by myself. Haha, but I have not done that for a

IOS-FMDB transaction [batch update database], ios-fmdb transaction database Open a database (sqlite) /// Open the database + (BOOL) openDataBase {_ TYDatabase = [[FMDatabase alloc] initWithPath: [self databasePath]; if ([_ TYDatabase open]) {return

IOS development Note 18: detailed compilation, development, debugging, and packaging, ios181. Reference a third-party library as a chain library In some special scenarios, you may need to use a third-party library using the blockchain library. The

Content Hugging Priority and Content Compression Resistance Priority resolution in AutoLayout for iOS development, autolayouthugging The content of this blog is not too complex.AutoLayout. This blog is mainly used for some

Zoom in View-> rotate-> restore animation, view animationTake UIButton as an example to create a class that inherits from UIButton. /* Create a storyboard for the page */ . H file @ Interface PTSRecommendButton: UIButton -(Void) viewTransform; @ End