objective c ios 11

original class produce name conflicts, the class overrides the original method because the category has a higher priority. 14. There are 3 main functions of the category: 1). Spread the implementation of the class across multiple different files or multiple different frameworks. 2). Create a forward reference to the private method. 3). Add an informal agreement to the object. Inheritance can add, modify, or Delete methods, and can add properties. For the understanding of the s

IOS 11 Development Tutorials (vii) write the first iOS11 code Hello,worldCode is a collection of command sequences that are written in a computer language to implement a particular function. Now it's time to implement the function of displaying the "Hello,world" string in the text box by code, as follows:(1) Use the three view mode icon in the Settings editor, 1.25 to adjust the Xcode interface to the effec

IOS 11 Development Tutorials (14) IOS11 App code add viewWhat if the developer wants to add views to the main view using code? The following will solve this problem for developers. To add views to the main view using code, you need to implement 3 steps.(1) Materialized View objectEach view is a specific class. In Swift, it is often said that a class is an abstract concept, not a specific thing, so you insta

IOS 11 Development Tutorials (20) iOS11 The status of the Settings button of the Apply View Beautification buttonIn example 2-2, when you set the caption and color of a button, you need to set the state of the button to indicate what the button's title and title color look like in a certain state. For example, Uicontrolstate.normal represents a state of a button. For such a view like a button, a view that c

IOS 11 Development Tutorial (22) IOS11 Application View Implementation button Response (2)At this point, when the user taps the button, a method called Tapbutton () is triggered.Note: This is done in conjunction with an action declaration and an association, and a way to first declare an action-related association. Declaring an action can use the keyword ibaction. The keyword can tell the interface of the s

Today's file Manager recursive recursion is the way the method calls itself a few lines of code function is very powerful.Determine if it is a folderBOOL isdir = NO;Nsfilemanager *FM = [Nsfilemanager Defaultmanager];if ([FM Fileexistsatpath:filepath isdirectory:isdir]isdir) {Cell.accessorytype = Uitableviewcellaccessorydisclosureindicator;}return cell;And there's a little misunderstanding that's been overlooked before.An initial value of int i is required; iLan Yi

attached, and the dictionary common key is as follows:? Uikeyboardframebeginuserinfokey / / the keyboard just started. Frame ? Uikeyboardframeenduserinfokey / / the final keyboard FRAME ( after the animation has finished executing ) ? Uikeyboardanimationdurationuserinfokey // time of keyboard animation ? Uikeyboardanimationcurveuserinfokey / / Rhythm of keyboard animation execution ( speed ) selection of notifications and proxies? Common Ground? Communication between objects can be accomplished

IOS development features 11: Inter-thread communication (3 methods) and ios3 All three methods are implemented by monitoring the touch of the screen through touchesBegin. 1. performSelector Mode 1 # import "ViewController. h "2 @ interface ViewController () 3 @ property (weak, nonatomic) IBOutlet UIImageView * imageView; 4 @ end 5 @ implementation ViewController 6-(void) touchesBegan :( NSSet Ii. GCD Mode

IOS miscellaneous pen-11 (the size of UIView cannot be changed externally), iosuiview I may not be very clear about the question. Now I will introduce this article in detail. The size of the UIVIew control cannot be changed externally. This is UIView, but in fact, most controls are not only UIView. What should I do if the size cannot be changed externally. First, rewrite setFrame to set its own size, as sho

IOS network analysis-(Introduction to third-party AFNetworking3.0 on November 11), iosafnetworking3.0 AFNetworking3.0 is the latest version. I was going to introduce it to 2.6, but I decided not to introduce it soon. Interested friends can check it online. Now I start to get started. Currently, no third-party network library is used most frequently. From the beginning of NSURLConnection to the current NSURL

UITextField Memory leakage on iOS 11, uitextfieldios MLeaksFinder is used for project optimization and performance check. When the memory leakage of interface elements is checked, memory leakage occurs when you exit the logon interface. The print log is as follows: In case that UITextField shocould not be dealloced, override-willDealloc in UITextField by returning NO. View-ViewController stack: (DLTLogin

IOS review Note 11: Protocol and proxy1. FunctionMethods can be declared in the Protocol (variables cannot be declared ),As long as a class complies with this Protocol, it is equivalent to having all the method declarations in the Protocol.The parent class is subject to the Protocol, and the subclass also has methods in the Protocol.The protocol can also be bound to another protocol.The Base protocol NSObje

Ios multi-thread operations (11)-advanced NSOperation operationsNSOperation can call the start method to execute tasks. By default, NSOperation is executed synchronously. If you add NSOperation to NSOperationQueue, the system automatically performs operations in the queue asynchronously. The operation can be canceled in NSOperationQueue. The pause and resume cancellation functions are as follows: - (void)ca

iOS Development errorLd:can ' t link with a main executable file '/users/apple/library/developer/xcode/deriveddata/ Lepaidemo-ftsuwgzvjdjwzghgkuefbzvdkvey/build/products/debug-iphoneos/lepaidemo.app/lepaidemo ' for architecture ARMv7Clang:error:unable to execute command:segmentation fault:11Clang:error:linker command failed due to signal (use-v to see invocation)The solution is to change architectures's debug to No.IOS Development Error Clang:error:un

Ios development diary 11-http and socket, ios11-httpsocket Today, the blogger has a need for network development and encountered some difficulties. I would like to share with you the hope to make common progress. Today, I would like to share with you the differences between http and socket. For specific network protocols, please refer to Baidu 1. http connection: an http connection is a short connection. A

write:data.bytes maxLength:data.length];4. You should close the stream when it is not needed[Stream Close];```(2) Settings for the network request header (you can set a part of the request download file)"' OBJC1. Set the Request object1.1 Create Request PathNsurl *url = [Nsurl urlwithstring:@ "Http://120.25.226.186:32812/resources/videos/minion_01.mp4"];1.2 Creating a Mutable Request objectNsmutableurlrequest *request = [Nsmutableurlrequest Requestwithurl:url];1.3 Get the remaining data size of

iOS Development multithreaded article-Custom nsoperationFirst, to achieve a simple tableview display effectImplementation results show:code example (using a previous way of doing business with the host controller)1. Create a new project to inherit the controller from Uitableviewcontroller.1//2// YYViewController.h 3// 01-Custom Operation 4//5// Created by Apple on 14-6-26.6// Copyright (c ) 2014 itcase. All rights reserved. 7//8 9 #import 2. Hand

Course Catalogue:The overall directory, the folder contains a multi-section video tutorial, please review post.00-Basic Class Video01 HD-ui Basics02 HD-ui Advanced03 HD-Multi-threaded network04 HD-Source code management tools05 HD-Combat Technology06 HD-OC Project07 HD-swift Project08 HD-Practical Technology09 HD-HTML510 HD-Cross-platform development11 HD-Instant Messaging: http://www.feixueteam.net/thread-851-1-1.html 2016 latest iOS video

*tmpstr2 = [str1 substringfromindex:3]; // from the beginning of the string to the index position, not including the indexnsstring *tmpstr3 = [str1 substringtoindex:5]; //Nsrange is a struct, takes the range of a string, the first parameter starts from which index value, and the second parameter indicates how long it takesNsrange s = {6,3};nsstring *TMPSTR4 = [str1 substringwithrange: s];NSLog (@ "TMPSTR2 =%@", TMPSTR2);NSLog (@ "TMPSTR3 =%@", TMPSTR3);NSLog (@ "TMPSTR4 =%@", TMPSTR4);//4. Ge

Nsurlsesstion-(void) Setsessiondidbecomeinvalidblock: (Nullable Void (^) (nsurlsession *session, Nserror *error)) block;-(void) Setsessiondidreceiveauthenticationchallengeblock: (Nullable Nsurlsessionauthchallengedisposition (^) (NSURLSession *session, Nsurlauthenticationchallenge *challenge, nsurlcredential * _nullable __autoreleasing * _Nullable credential)) Block, .....-(void) Setsessiondidbecomeinvalidblock: (void (^) (nsurlsession *session, Nserror *error)) block { Self.sessiondidbecome