xcode swift tutorial

start with a number, and you cannot define the same name repeatedly.letπ= 3.14159Let's Hello = "Hello World"Let???? = "Dogcow"//Head of dog and cowvar friendlywelcome = "Hello!"Friendlywelcome = "bonjour!"1.2 statements, semicolons, and annotations (Comment)The general line is a statement with no semicolon at the end.Single-line Comment/* */Multi-line comments, can be nested. By using nested multiline annotations, you can quickly and easily comment out a large piece of code, even though the cod

starts when the player in the No. 0 grid, Board[0] or 0, no impact:Do {The code checks the ladder or snake and then moves through the dice. And then a round of loops ends.The loop condition is the same as the previous one, but this time, when the loop condition is only completed the first cycle will be the first calculation. For this game, the Do-while cycle is more appropriate than the while period. On the Do-while loop, when the loop condition is determined squre but on the blackboard, he sta

optionalname:string?= "John Appleseed"var gretting = "Hello!"If let name = optionalname {gretting = "Hello, \ (name)"}Flexible switchThe switch in Swift supports a wide variety of operations:Let vegetable = "red pepper"Switch Vegetable {Case "Celery":Let vegetablecomment = "Add some raisins and make ants on a log."Case "cucumber", "watercress":Let vegetablecomment = "so would make a good tea sandwich."Case Let X where X.hassuffix ("Pepper"):Let veget

the task and execute the task. First open Xcode to build a new project, select the Swift language, then just modify the default created Viewcontroller(1) Define an abstract implementation scheme (protocol), which follows the implementation of two eventsProtocol hwcsleepdelegate{func Willstarttosleep ()func Didfinishedsleep ()}(2) Define function classes to simulate long-time tasksclass hwcsleep{ var dele

Apple Swift programming language Introductory Tutorial "Chinese version"Directory1 Introduction2 Getting Started with Swift3 Simple values4 Control Flow5 Functions and closures6 Objects and classes7 Enumerations and structsNext: Apple Swift programming language Introductory Tutorial "Chinese version", the last time to

guarantees that the object is not freed in memory, when its reference count is 1. The ⑩ line Code REF2 = Ref1 is to assign a reference to the object to Ref2,ref2 and to establish a "strong reference" relationship with the object, when its reference count is 2. The first line of code REF3 = Ref1 is to assign a reference to an object to REF3,REF3 also to establish a "strong reference" relationship with the object, when its reference count is 3.The reference count of the employee object is then br

[National debut] Swift video tutorial-(Video continuous update-2014.6.13 update) The download and playback addresses of all videos are http://www.iphonetrain.com/video_list/86/87.html. all codes and courseware are included in the bread! URL mentioned in the Tutorial: Mac OS X system 10.10,: http://pan.baidu.com/s/1eQj94jg Xcode6-Beta,: http://pan.baidu.com/

of the employee object is then broken by the REF1 = Nil statement in the code line, when it is referenced by 2. And so on, Ref2 = nil when its reference count is 1,REF3 = nil when its reference count is 0, when the reference count is 0, the employee object is freed.We can test to see the effect, if you set a breakpoint to step through debugging, you will find that the code runs out of line ⑨ after the console output:Employee Blake has been constructed successfully.The contents of the destructor

Swift Tutorial _swift FAQ (0001) _coredata:warning:unable to load class named ' xxx ' for entity ' xxx 'Swift Tutorial _swift FAQ (0002) _ Perfect handling of Sourcekitservice crashed exceptions. Most of the 6.1.1 have been repairedSwift Tutorials _swift Frequently asked questions (0003) _storyboard changes do not take

Implementation of the list of Swift development iOS apps (1) Hardware and Software Environment OS X EI Capitan Xcode 7.0.1 Brief introduction list, which can be said to be the most important one in the control, is UITableView in iOS, and this section will learn how to implement a list, as shown below Implementation steps UI section Create a new project, project named Uitableviewdemo, template

After a week of preparation, the swift online weather forecast video tutorial met with you. This set of video cases requires a certain language base learner.Knowledge points involve many aspects.For example: Swift location location corelocation, how Swift calls OC components, installation of afnetworking, etc. also inv

circumstances. Moving is legal and will not allow you to cross the border.You move in accordance with the number of dice, and then check that the current position is not a snake head or ladder can move.Then the current loop ends and returns to the while conditional statement to infer whether the next loop is required.NOTE that the break statement above does not work with the gameloop tag. That break simply jumps out of the switch without terminating the entire while loop. Using the Gameloop tag

out;It's just a simple jump and a partial proxy in the controller.Comparing with the MVVM development Framework is the controller using TableView; Cell customization; define the desired model; define the corresponding interface for the ViewModel callHere's an MVVM framework development, demo with network requestCatalogue Description:Resourse: Storing pictures, audio video files, IB filesControllers: Storing the View controllerVender: Open source Framework, or components of your own packageUtilt

Process Control 1 counting loops within a specific range, structure forFor Loopvar in Startnumber...endnumberThe keyword in is followed by a starting number, three periods, and an ending number, as an example:var loopcount:int=0for loopcount in 1...10 {print ("#\ (Loopcount)")}2 variants syntaxFor Loopcount in 1..3 Vintage for loopFor loopcount=0;loopcountGetting Started with playgroundProcess Control is decision makingif (true/false) {//do sth}else{//do other thing}

can get all the keys and values by knowing the following two properties var keys:lazybidirectionalcollectionHow to use:var mydic:dictionaryOutput:Swift.LazyBidirectionalCollectionSwift.LazyBidirectionalCollectionYou can see that the output is a collection type, and if we want to see its value, we can put it in the array:var mydic:dictionaryOutput, all keys values[Maths, Chinese] [100, 99]7. Several ways to delete a dictionary element(1) Deleting a single array elementYou can use Dic[key] = n

Some basic attributes that need to be instantiated can be defined in the protocol. here, let's take a look at the protocol (protocol) tutorial in Swift. For more information, see I. INTRODUCTION The protocol defines some attributes and methods. Their functions are similar to abstract classes in Java. the types in Swift comply with the protocol to implement some

This is a translation of the article, the original source: http://www.raywenderlich.com/82706/working-with-json-in-swift-tutorialHow to use the JSON data tutorial in the Swift languageJSON (full name: JavaScript Object Notation) is a common method of transmitting data in Web services, and JSON is very popular because it is easy to use and readable.Here is a snipp

Original blog, reproduced please indicate the sourceBlog.csdn.net/hello_hwcDefinition of a generic typeSimilar to C + +, generics define a kind of reusable code for any type that implements code in an abstract way. Both the array and the dictionary of Swift are implemented with generics, because arrays can hold variables of type string, or they can be of type int.As an example,Func swaptwoints (inout a:int, inout b:int) {let Temporarya = a a=b

Swift development Tutorial: Using Generics to facilitate the loading process of xib, swiftxib Swift development tutorials facilitate the xib loading process with generics. /// UIView + Extension. swift // BasicSwift /// Created by CoderZYWang on. // Copyright©2017 hc. All rights reserved. // import UIKit // load the x

"; str.drawatpoint (CGPointMake (100, , withattributes:nil); //Picture cgcontextsetshadow (Context,cgsizemake (3,3), ten) varimg:uiimage=uiimage ( named: "8")!; nBsp;img.drawatpoint ( Cgpointmake (50,250)); //cgcontextdrawimage (context, CGRectMake (100,NBSP;250,NBSP;100,NBSP;100), IMG. Cgimage) Cgcontextsetshadow (Context,cgsizemake (0,0), 0) //Using path Paint letp1:cgmutablepathref=cgpathcreatemutable (); cgpathmovetopoint (p1,nil,50,250) cgpathadDlinetopoint (p1,nil,50,350) cgcontextad