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What is Segue ? Each line on the storyboard for interface jumps is a Uistoryboardsegue object (abbreviated segue)Segue of the Properties? Each of the Segue objects has 3 propertiesuniquely identifies@ Property (nonatomic,readonly) nsstring*identifier;Source Controller@ Property (nonatomic,readonly) IDsourceviewcontroller;Target Controller@ Property (nonatomic,readonly) IDdestinationviewcontroller;Segue of type? According to Segue's execution (jump)

First, why use the block callback in some third-party SDK does not need to use weakself, for example AFN AFN in the package, rewrite the setCompletionblock method, after the callback directly to the Completionblock to nil, breaking the circular reference Second, why should block use Copy to modify By default, the block is archived in the stack, the scope is reclaimed, and then the call is crash, and the copy operation allows it to keep a copy in the heap, guaran

IOS Study Notes: (2) c language-2.3 identifier 1. What is an identifier is some of the symbols and names customized in the program. To distinguish it from keywords: keywords are the default symbols provided by C language, and identifiers are customized by programmers. identifier 1) identifier, literally used to identify something, the purpose of the identifier i

corresponding city of the corresponding province Nsarray *cities = province.cities; //3. Returns the number of cities return Cities.count; } } #pragma mark-Proxy methodTell the system what each line shows-(NSString *) Pickerview: (Uipickerview *) Pickerview Titleforrow: (nsinteger) Row forcomponents: (Nsinteger) component{if (0 = = component) {Provincesreturn [Self.provinces[row] name];} else {//City0. Get the row selected in column No. 0Nsinteger

XMPP protocol for instant messaging underlying writing (2) -- IOS XMPPFramework Demo + analysis, xmppxmppframework I hope This is a new day! Before reading the code, I think you should first sort out your mood and let me say a few words: First, I hope that you will read this blog in the morning and then start to operate it. If you only read the blog and do not compare the project yourself, it will not be ve

independent of their types and creation methods. The class to be instantiated is determined at runtime. Do not want the factory level that corresponds to the product level. The differences between instances of different classes are only several combinations of States. (Copying the corresponding number of prototypes is more convenient than manual instantiation) Class is not easy to create. (It is easier to copy existing composite objects and modify copies) Knowledge mainly involved: copy and c

ReuseIdentifier:nil]; Wscargroup *cg=self.cargroups[indexpath.section]; Cell.textlabel.text=cg.cars[indexpath.row]; return cell;} -(NSString *) TableView: (UITableView *) TableView titleforheaderinsection: (nsinteger) section{Wscargroup *cg= Self.cargroups[section]; return cg.title;} -(NSString *) TableView: (UITableView *) TableView titleforfooterinsection: (nsinteger) section{Wscargroup *cg= Self.cargroups[section]; return CG.DESC;}--of course, to show convenience, hide the top st

value and the return value of the object; 4. Initialization method: No matter what method can take parameters and return values,The initialization of some of the content needs to be changed with the parameter variables, so that each generation of the object name and age have to call simultaneous incoming name and age decision;5, Inheritance: The subclass of some similar behavior with a parent class to initialize these properties and methods, the sub-

Document directory Initialization Problems Implementation Initialization Method Next, take the Cocoa framework summary For iOS (1) and continue to summarize the Cocoa objects.1. We all know that there are two steps to create a Cocoa object: alloc and init (Object allocation and initialization. Initialization is usually followed by object allocation, but the two operations have different functions. Allocation object: Cocoa allocates a block of me

represents the control's refusal to compress the built-in space. The higher the priority, the less likely the control's built-in space will be compressed. And here's the built-in space, that's what it says UIView intrinsicContentSize .So, if we set a higher value for the content hugging priority of view1 (in the view above), then when AutoLayout encounters such a decision about who to stretch, View1 will not be stretched, View2 with a lower priority

I am a little flattered to see so many replies and encouragement. Thank you for your support. I will try my best to record the process of learning iOS and share it with you. Today I read the second chapter of the book, which mainly introduces how to use xcode and some necessary instructions. Finally, I made a "Hello world !" Is to display "Hello World!" with a label on the screen !", I did not write a line of code, drag the control, change the label f

IOS RunLoop Analysis 2. iosrunloop Analysis In the previous article, we talked about several runloop modes. What do we need to do in the mode ??? There are three modules in the Mode:Event Source (Input Source) Source Source: By Official Document Port-Based Custom Input Cocoa Perform Selector By function call stack and Source Source0: Non-Port-based Source1: Port-

The office machines were originally used by others, while Xcode was also downloaded by another user's account. When I tried to upgrade Xcode yesterday, I found that there was no password. In order not to disturb others, but to make it easier for me to upgrade it, I just uninstalled the old version and downloaded the new version 4.6. After the download is complete, the problem occurs. Some previously configured Xcode settings are missing, so you have to reset the settings. Your memory is not good

IOS development and learning # reminder processing # (2) Response Action Form In the action form, we use a lot of buttons for implementation. Here we use the actionSheet: clickedButtonAtIndex: method implementation in the UIActionsheetDelegate Protocol. Its syntax is as follows: -(Void) actionSheet :( UIActionSheet *) actionSheet clickedButtonAtIndex :( NSInteger) buttonIndex; (UIActionSheet *) The actionSh

It is one o'clock in the morning, ready to go to bed, daytime learning efficiency is not high, you have to work overtime.Today I studied TableView Navigationcontroller navigation controller Tableviewcontroller night but the job is to use these controls plus a few days ago to learn the positive and negative values to achieve a simple address book.Because the knowledge of the day learning points are not mastered well, so at night do homework need to look at the knowledge points of the day, while w

Parsing Document");} 1.2.2 second format (written in attribute) Data_xml2.txt//Parsing XML//1.SAX Progressive Parsing (System-provided) data is used in large numbers.//1.1 Providing a file path string//Get file 2NSString * Filepath2=[[nsbundle Mainbundle]pathforresource:@"DATA_XML2"OfType:@"txt"]; NSData* data2=[NSData Datawithcontentsoffile:filepath2]; //1.2XML ParserNsxmlparser*parser2=[[Nsxmlparser alloc]initwithdata:data2]; //Set up proxyParser2.Delegate=Self ; //1.3 Starting the parse

Meteclass;Common Runtime methods: 123 objc_setassociatedobject --- Set Association class_addproperty ( [someclass class , "name" , attrs, 3) ; ---> Add property class_addmethod ( [someclass class] , @selector (setname:) (imp) namesetter, "[email protected]:@ ") ; ---> Add method RunloopRunloop is the concept of a loop, or, to be precise, a loop in a thread is actually an object that inherits NSObject.Nsrunloop's role is to have something

difference between declaring Zodiac in a header file and an implementation file (*.M)Properties and methods declared in the header file are visible externally and are not visible to the external part declared in the implementation fileViewcontroller A Viewcontroller view is created only when it needs to be displayed on the screen, and this lazy loading method can save memory and lift performance .Viewcontroller has two ways to create its view tree:1. Loadview method to overwrite Uiviewcontrolle

IOS AutoLayout (2)-dynamic diagram (iosautolayout) Original Blog, reprinted, please indicate the sourceBlog.csdn.net/hello_hwc Preface: The previous article introduced some preparations for AutoLayout. This article continues to explain how to use Storyboard to create AutoLayout. The next article will explain how to use Code to create a Storyboard. Use Control + Drag to create -For the constraints of a

network programming model in Java and AIO in LinuxNIO framework entry (1): Demonstration of netty4-based UDP bidirectional communication on the serverNIO framework entry (II): demo of UDP two-way communication on the server based on mina2Introduction to NiO framework (III): cross-platform UDP bidirectional communication between iOS, mina2, and netty4Introduction to NiO framework (iv): cross-platform UDP bidirectional communication between Android, mi