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] initwithrootviewcontroller:vc0];Because the current view is not managed by navigation, you cannot use the push method to jump, only use the present method to jump[Self Presentviewcontroller:navcontroller animated:yes completion:nil];Self.navigationcontroller PropertyIf the current view controller is already managed by the navigation controller, this property has a roleThis property is not used if the current view controller is not managed by the navigation controller (value nil)[Self.navigatio

Nything is object, objects are objects, an object is an instance of a class in memory,Property @propertyAttribute Concept OC Language There is no in C languageSelf calls the method of the current object, and the object method uses the object name of the instance to tuneThe Access property in the class is a point, and the access method is with a space.Basic data types, such as int,float,double, are stored in the stack memory when they declare negative values.Global variables not initialized defau

Yi Meng tcp file upload download and Automatic Update system introduction (TCP File Transfer)The system is based on the open source Networkcomms communication framework, which was previously charged, is now free and Kaiyuan, the author is the United Kingdom, the development time of more than 5 years, the framework is very stable.Project Address: https://item.taobao.com/item.htm?spm=686.1000925.0.0.AjdBGPid=537538462790Consulting qq:286275658Demo Progr

1 implementation of a single case see previous written article Quick implementation of iOS single exampleStatic Instanceclass *instance; + (Instanceclass *) defaultinstance{ @synchronized (self) { if (instance = = Nil) { instance = [[Instanceclass ALLOC] init]; } } return instance;}2 A review of the concept of a single caseThe singleton pattern means that there is

Today is the practice day, after the formal start of the week to Saturday Tuesday are practice days, there is no corresponding rest day, so that the main arrangement is to allow you to timely review the content of the study, will not accumulate more, from the two days of learning content, such arrangements are reasonable, the formal start of the classroom capacity is very large, For those of us who are 0 basic students, the evening self-study is not enough, need extra time to learn the content o

And every Saturday, I feel the recent 3 days to learn a lot of things, but today to study the people just feel just about half, perhaps because of the two weeks we have no time to rest the reason for it! However, I am not particularly sure of what I have learned these days, and today I have not been able to master the whole system without reading the book. Let's talk about what we are going to review today: 1, mainly review the string of some basic content: Create, splice, intercept, address sp

This morning most of the time to review the contents of the study since the beginning of the school and explain yesterday's homework, yesterday's work in the realization of different Zomb scored different this function when the teacher skillfully use the value of self.speed to achieve different points, instead of assigning different tag last case The method of tag value to judge different zombies plus different scores is not usedif ([Z ISMEMBEROFCLASS:[ZOMBC class]]) method to judge different

currently displayed cell in the Jumppage method14. Let Item+1 get a new position based on the current position and let CollectionView scroll to a new location15. Protocol method for implementing scrollviewdelegate the timer stops when you start dragging16. The timer starts again at the end of the drag-(void) Viewdidload {[Super Viewdidload];Uicollectionviewflowlayout *layout=[[uicollectionviewflowlayout Alloc]init];Layout.scrolldirection=uicollectionviewscrolldirectionhorizontal;Uicollectionvie

I. Using OC1. First, to add a proxy uitextfielddelegate2. Set proxy textfield.delegate = self;3. Implementing the methods in the ProtocolClick Return to retract the keyboard-(BOOL) Textfieldshouldreturn: (Uitextfield *) TextField{Recycle keyboard, cancel first responder[TextField Resignfirstresponder];return YES;}Click on the empty space to retract the keyboard-(void) touchesended: (Nsset *) touches withevent: (Uievent *) Event {[TextField Resignfirstresponder];}Two. Using SwiftSteps 1, 2 and OC

*P1 = [[Person alloc]init]; P1.name = @ "Zhangsan"; P1.age = 22; P1.gender = ' F '; Person *P2 = [person new]; P2.name = @ "Lisi"; P2.age = 23; P2.gender = ' M '; Nsmutabledictionary *dic = [Nsmutabledictionary dictionarywithcapacity:30]; [DiC setobject:p1 forkey:@ "Person1"]; [DiC setobject:p2 forkey:@ "Person2"]; To deposit the contents of a dictionary into a file if ([Nskeyedarchiver archiverootobject:dic tofile:@ "/users/mac/desktop/a.plist"]) { NSLog (@ "Che

shutter switch effectTask 2.4 making web images floating effectTask 2.5 making a Web calendarTask 2.6 making flashing effect textTask 2.7 making text box typing effectTask 2.8 Password Strength detectionItem 2 exercisesComprehensive Training 2Item 3 jQuery page EffectsTask 3.1 making Web site swipe menuTask 3.2 making normal drop -down menuTask 3.3 making multi-level drop-down menuTask 3.4 Making a horizontal focus shift menuTask 3.5 Mouse Click the picture pageTask 3.6 Creating a text color Pi

cause the performance of the Web page, in IE may cause memory leaks. The workaround is to remove all unused local variables before exiting the function.2) The closure changes the value of the inner variable of the parent function outside the parent function. So, if you use the parent function as an object, and the closure as its public method, and the internal variable as its private property (private value), be careful not to arbitrarily change the value of the inner variable of the parent fun

And deeply understand again prim and Dijkstra algorithm, feel pretty good ~The first time I write with the adjacency table, just soso~ AH ~First by priority queue, overloaded operator to get stuck ~ Egg ache ~1#include 2#include 3#include 4#include 5#include string>6#include 7#include 8#include 9#include Ten#include One#include string.h> A#include -#include - #defineINF 1e7 the #defineMAXN 111111 - using namespacestd; - - + structnode{ - intV, W; + BOOL operatorConstnode a)Const { A

= 0; } Test (); alert (x); 0 Scenario Two: Invocation as an object methodA function can also act as a method call to an object, at which point this is the ancestor object. function Test () { alert (this.x); } var o = {}; o.x = 1; O.M = test; O.M (); 1 Scenario three is called as a constructor functionThe so-called constructor is to generate a new object by this function (object). At this point, this is the new object. function Test

. NET Framework | notes | procedure | Design 13th Zhang Yi type and bit mark One, enum type 1, the use of enumerated types of reasons: L enumeration type is to make the program easier to write, read, maintain, in the code in the use of symbolic names to replace the number is a consistent idea of programming. L strongly typed, easy to type test 2, Attention matters: L Enum type inherits from System.enum,system.enum and inherits from System.valurt

height of the iphone4s screen is 480, when the screen size is greater than iPhone4, Autosizescalex and Autosizescaley are the aspect ratios of the current screen and iPhone5 dimensions. Like whatIf it is 5,autosizescalex=1,autosizescaley=1;If it is 6,autosizescalex=1.171875,autosizescaley=1.17429577;If it is 6plus,autosizescalex=1.29375,autosizescaley=1.2957;Now that we have the proportional relationship, let's take a look at how to solve the code-setting interface compatibility.CGRectMake (CGF

performance. If the speed is not fast enough, Python will need an external force: analyze and run outside code. We'll cover this in part two of this article.www.qytang.com/http://www.qytang.com/cn/list/29/http://www.qytang.com/cn/list/28/358.htmhttp://www.qytang.com/cn/list/41/http://www.qytang.com/cn/list/37/http://www.qytang.com/cn/list/46/http://www.qytang.com/cn/page/19.htmhttp://www.qytang.com/cn/list/32/http://www.qytang.com/cn/list/28/http://www.qytang.com/cn/list/25/http://www.qytang.co

When crawling site content, the most common problem is: the site has limited IP, there will be anti-grab function, the best way is IP rotation crawl (plus agent)Here's how scrapy Configure the agent for crawling1. Create a new "middlewares.py" under the Scrapy project 1234567891011121314 #Importingbase64librarybecausewe‘llneeditONLYincaseiftheproxywearegoingtouserequiresauthentication importbase64 #Startyourmiddlewareclass classProxyMiddleware(object): #overwriteprocessrequest d

{Public declarations}EndVarFrmusers:tfrmusers;ConstM_title= ' Operation Tip ';//title of all prompt dialogsImplementation{$R *.DFM}function Tobjusers:tiusermaintclass;External ' UserSvr.dll ';Procedure Tfrmusers.btnupdateclick (Sender:tobject);VarNerr:integer;BeginIf Cdsusermaint.state=dsedit then cdsusermaint.post;if (Cdsusermaint.changecount > 0) ThenBeginObjusers.updateuserdata (Cdsusermaint.delta,nerr);If Nerr>0 ThenApplication. MessageBox (' update failed ', m_title,mb_iconwarning)ElseBegin

30th use enum instead of intIn all, there are several advantages to using enum1. Compile-time type safety,2. Can be guaranteed to be the value of their own definition, there is no monthly risk,3. Each enum type has its own namespace4. Enumeration can add arbitrary methods and fields5. The enumeration type is final and cannot be instantiated, that is, the instance is controllable.31st Replace ordinal with instance fieldThat is, do not rely on enumerations to specify their values in order to defin