ios development classes nyc

; Writes the data of the binary stream into the file.NSData * data2 = [str1 datausingencoding:nsutf8stringencoding]; string to data stream [data2 writetofile:@ "/users/file path secrecy/data2.txt" Atomically:yes];Both of the above data written to the file are finally read directly in the production Str1.txt and data2.txt documents. Find it in the target path, just as we open the ordinary txt document and we can see it, in fact it is a common txt document. This is the final effect.Two concepts of

); Replaced.Is it more convenient? The key is that you don't have to declare the agent, implement, set up the agent, maintain the protocol and so on complex process.The agent also has a restriction is to have to object, if a tool class is an instance of a class method, you want to call back the data to the C layer after some operations, this time the agent can not be implemented, but the block is not an object only, like NSString, to help you achieve.The above is just the magic of block syntax i

An analysis of the use of Block syntax in ios development and the use of iosblockIn fact, the development of any application is inseparable from multithreading. Block and GCD are the core of multithreading in Apple OC. 1. the internal structure of a block is in oc. The block syntax exists in the form of a closure. Each Objective-C object occupies a certain memory

Recently want to learn the development of iOS, in NetEase Open class to find a course, ready to listen to this course, as a primer.The course's name is: Stanford University Open Class: ipad and iphone App development (IOS5)Links: http://open.163.com/special/opencourse/ipadandiphoneapplication.htmlToday, I listened to the first lesson and probably said something l

variable var age = 20 or var x = 0.0, y = 0.0, z = 0.02. You can basically use any character you like as a constant and variable name(1) letπ= 3.14159(2) Let URL = "http://ios.itcast.cn"(3) Let???? = "Puppy and cow"// ?? And?? It's a emoji expression, a special Unicode character.You can use shortcut keys on your Mac: Control + COMMAND + space, pop-up emoji keyboard3. Note Points for constants and variable namesCannot contain mathematical symbols (e.g. + 、-、 *, \)Cannot contain arrows (e.g. ↑, ↓

iOS Development Swift Chapter-(ii) Variables and constantsFirst, the performance of the language(1) According to WWDC's displayOBJECTIVE-C has 2.8 times times the performance of Python when it comes to sorting complex objects, and Swift has 3.9 times times the performance of PythonThe performance of objective-c is 127 times times that of Python when implementing the RC4 encryption algorithm, and Swift's per

=[Icocostagmodel Objectarraywithkeyvaluesarray:responer]; + -Icocoslog (@"iOS-----Success"); theIcocoslog (@"%@", self.tags); * $ //Refresh TablePanax Notoginseng [Weakself.tableview Reloaddata]; - the //Hide Cue box + [Svprogresshud dismiss]; A the} failure:^void(Nsurlsessiondatatask *data, Nserror *error) { + - /** $ * Status code after request failed $ */ - -

1 PrefaceConcurrency is everywhere in programming. How to better utilize concurrency in IOS development has become a key issue. Today we will briefly introduce concurrency. 2 Text Concurrent Execution occurs when two or more tasks are executed simultaneously. Even if there is only one CPU, the modern operating system can execute multiple tasks at the same time. Grand Central Dispatch, or GCD (Central schedu

Someone asked, under the arc, Iboutlets should be defined as strong or weak? The answer is supported by the largest number of people, with only one excerpt from an official document:from A practical perspective, in IOS and OS X outlets should is defined as declared properties. Outlets should generally is weak, except for those from File's Owner to top-level objects in a nib File (or, in IOS, a sto Ryboard s

iOS development of embedded advertising, commonly used advertising framework to achieve, commonly used by Apple's official: iad and the three-party image: InMobi, etc. The following are described separately: iad framework IOS 4.0 introduced the IAD Framework (iad.framework) support program to display banner ads. Ads are made up of standard view, you can insert

In iOS development learning, I often cannot figure out the iOS development mode. Today we will make a simple summary and discussion ~ (1) proxy Mode Application Scenario: when some functions of a class need to be implemented by another class, but you are not sure which class will be implemented.Advantage: decoupling Ag

Recorded, aggregated data IOS project development Combat: Barcode Finder: Video address: http://www.jikexueyuan.com/course/324.htmlBarcode Query API:HTTPS://WWW.JUHE.CN/DOCS/API/ID/52Core content:1. Barcode Finder structure analysis.2. How to add the aggregation data SDK to the project.3. Encapsulation of models and business classes.4. Data transfer between contr

Original link: Http://liuyanwei.jumppo.com/2015/07/17/ios-BLE-1.html iOS bluetooth development (i) Bluetooth related basics:Bluetooth common names and abbreviations MFI ======= make for ipad, iphone, itouch devices for Apple devices ble = buletouch Low energy, Bluetooth 4.0 devices because of the power consumption, so also

. Of course, the topic itself is ambiguous, if it is not our qualitative thinking of Uiviewcontroller,Instead of a macro representation of the view controller, we can think of it as a view control that can control multiple view controllers, such as TabbarcontrollerThat kind of feeling.20.Can we use one tableview with different datasources? How are you would achieve this?Can a tableview be associated with two different data sources? What would you do with it?Answer: First of all, from the code po

. Initialize a cgimageref output Picture object merge Filter output image5. Assign to UIImage object for display6. If you want to use a filter chain, you can add effects again四、一个 Instance resolution filter filter Chain save picturecode example:#import "ViewController.h"//macro Definition screen width # screen_width cgrectgetwidth ([UIScreen mainscreen].bounds)// Note Hang up Agent @interface Viewcontroller () The 2015 Apple WWDC conference brought some good news to developers fascinated

IOS development network-basic use of NSURLConnection, iosnsurlconnection IOS development network-basic use of NSURLConnection I. Common NSURLConnection classes (1) NSURL: request address (2) NSURLRequest: encapsulates a request and stores all the data sent to the server, inc

A brief analysis of the use of Block syntax in ios developmentIn fact, the development of any application leaves multithreading. Block and GCD are the core of multithreading in Apple OC. 1. the internal structure of a block is in oc. The block syntax exists in the form of a closure. Each Objective-C object occupies a certain memory area. The block itself is also an object. In the memory area of the object s

Recommended by blue ou iOS Training Instructors: we hope that more and more people will learn the OC content and learn the iOS development courses. As a senior iOS development engineer required by major enterprises, this is an essential talent for enterprises, so the introdu

1. MantleMantle allows us to simplify the model layer of COCOA and Cocoa Touch applications. To put it simply, a network request is often made in the program, and the request is generally a JSON string, and we typically build a model class to hold the data. This requires that we write a series of serialization code to convert the JSON to Model. This is time-consuming, error-prone, and not easy to modify. Mantle is a good solution to this problem and is easier to use. Github:https://gith

1. MantleMantle allows us to simplify the model layer of COCOA and Cocoa Touch applications. Simply put. A network request is often made in the program, and the request is usually a JSON string. We usually build a model class to hold the data. This requires that we write a series of serialization code to convert the JSON to Model. This is a very time-consuming, easy mistake. Not easy to change. Mantle was very good at overcoming this problem. and easier to use. Github:https://github.com