Get,post synchronous and asynchronous all-in-code method

#pragma get synchronization:

Synchronous network requests are not recommended in development

-(Ibaction) Gett: (ID) Sender {//the method obtained through storyboard association

Address string

NSString *urlstring = @ "http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date= 20131129&startrecord=1&len=5&udid=1234567890&terminaltype=iphone&cid=213 ";

Uniform Resource Locator (URL)

Nsurl *url = [Nsurl urlwithstring:urlstring];

First parameter: Uniform Resource Locator (URL)

Second parameter: Cache policy

Third parameter: Time-out

Nsurlrequest *request = [Nsurlrequest requestwithurl:url cachepolicy: (nsurlrequestreloadignoringlocalcachedata) TIMEOUTINTERVAL:60.0F];

Nsurlconnection is not recommended after iOS 9.0

First parameter: object of type Nsurlrequest

The second parameter: the information stored is some network request, generally nil (package body)

Third parameter: Error message

NSData *data = [nsurlconnection sendsynchronousrequest:request returningresponse:nil Error:nil];

NSLog (@ "data=====%@", data);

Parsing data

Nsdictionary *dic = [nsjsonserialization jsonobjectwithdata:data options: (nsjsonreadingallowfragments) Error:nil];

NSLog (@ "dic===%@", DIC);

}

/*

Nsurlrequestuseprotocolcachepolicy

: underlying cache policy

* Nsurlrequestreloadignoringlocalcachedata

: Ignore local cache

* Nsurlrequestreloadignoringlocalandremotecachedata

: Ignore local cache, regardless of local cache, are downloaded from the network

Nsurlrequestreloadignoringcachedata=nsurlrequestreloadignoringlocalcachedata,

: If the local cache is valid, do not download it.

Nsurlrequestreturncachedataelseload

: Prefer to use local cache, if there is no cache locally, go to download

* Nsurlrequestreturncachedatadontload

: Never download, only use local cache, if not, the request fails. More for offline environments

* * Nsurlrequestreloadrevalidatingcachedata

: Verify that local data and network data are the same, if different, go to download, if same, use local cache

*/

#pragma post synchronization:

-(Ibaction) POSTT: (ID) Sender {

NSString *urlstring = @ "Http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx";

Nsurl *url = [Nsurl urlwithstring:urlstring];

Nsmutableurlrequest *urlrequest = [Nsmutableurlrequest Requestwithurl:url];

Create a string

NSString *datastring = @ "Date=20131129&startrecord=1&len=5&udid=1234567890&terminaltype=iphone &cid=213 ";

Convert this string to an object of type NSData

NSData *postdata = [datastring datausingencoding:nsutf8stringencoding];

Set the request way in uppercase such as: POST GET

The GET request can not be set, but the POST request must be set

[URLRequest sethttpmethod:@ "POST"];

Put the data you need to upload into urlrequest.

[URLRequest Sethttpbody:postdata];

NSData *resultdata = [nsurlconnection sendsynchronousrequest:urlrequest returningresponse:nil Error:nil];

Nsdictionary *dic1 = [nsjsonserialization jsonobjectwithdata:resultdata options: (nsjsonreadingallowfragments) Error: NIL];

NSLog (@ "dic1====%@", Dic1);

}

#pragma get async:

The first type:

-(Ibaction) GetY: (ID) Sender {

NSString *string = @ "Http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?";

Nsurl *url = [Nsurl urlwithstring:string];

Nsurlrequest *request = [Nsurlrequest Requestwithurl:url];

Call a method with a block callback to perform a network request

First parameter: nsurlrequest

Second parameter: in which thread the code inside the block blocks executes

[Nsurlconnection sendasynchronousrequest:request queue:[nsoperationqueue Mainqueue] completionHandler:^ ( Nsurlresponse * _nullable response, NSData * _nullable data, Nserror * _nullable connectionerror) {

Response is carrying some information about the interface.

Data that is requested to be used by the

Connectionnnerror error message

if (Connectionerror = = nil) {

Nsdictionary *dic2 = [nsjsonserialization jsonobjectwithdata:data options: (nsjsonreadingallowfragments) Error:nil];

NSLog (@ "dic2====%@", Dic2);

The UI should be refreshed here

1. Assigning a value to an array of data sources

2; Refresh UI ([Self.tableview Reloaddata]) after assignment ends

}

}];

}

The second method of

-(Ibaction) Get: (ID) Sender {

How to use block callbacks

Using the system-provided global Nsurlsession object, is a single case

Nsurlsession *session = [Nsurlsession sharedsession];

NSString *string = @ "http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date= 20131129&startrecord=1&len=5&udid=1234567890&terminaltype=iphone&cid=213 ";

Nsurl *url = [Nsurl urlwithstring:string];

Nsurlsession is task-based, so everything is put into the task, Nsurlsessiontask is Nsurlsession's task execution object

Nsurlsessiontask *task = [Session Datataskwithurl:url completionhandler:^ (NSData * _nullable data, Nsurlresponse * _Nulla BLE response, Nserror * _nullable error) {

if (Error = = nil) {

Nsdictionary *dic = [nsjsonserialization jsonobjectwithdata:data options: (nsjsonreadingallowfragments) Error:nil];

NSLog (@ "dic===%@", DIC);

}

}];

All nsurlsession tasks are suspended by default, so be sure to call the Resume method to start the task

[Task resume];

}

//The third method follows Nsurlsessiondatadelegate nsurlsession the proxy protocol for obtaining network data

Asynchronous operation of the nsurlsession agent

The properties of the Nsurlsession agent are read-only

First parameter: Session mode

Second parameter: Agent

Third argument: The proxy method is in that thread.

Nsurlsession *session1 = [Nsurlsession sessionwithconfiguration:[nsurlsessionconfiguration Defaultsessionconfiguration] delegate:self delegatequeue:[nsoperationqueue Mainqueue]];

Nsurl *url = [Nsurl urlwithstring:@ "http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/ Apinewslist.ashx?date=20131129&startrecord=1&len=5&udid=1234567890&terminaltype=iphone&cid =213 "];

Sub-class object for Nsurlsessiondatatask

Nsurlsessiondatatask *datatask = [Session1 Datataskwithurl:url];

[Datatask resume];

}

Server starts responding

-(void) Urlsession: (Nsurlsession *) session Datatask: (Nsurlsessiondatatask *) Datatask Didreceiveresponse: ( Nsurlresponse *) Response Completionhandler: (void (^) (nsurlsessionresponsedisposition)) Completionhandler {

Completionhandler (Nsurlsessionresponseallow);

Self.resultdata = [Nsmutabledata data];

}

Receive the data

-(void) Urlsession: (Nsurlsession *) session Datatask: (nonnull nsurlsessiondatatask *) datatask didreceivedata: (nonnull NSData *) Data {

[Self.resultdata Appenddata:data];

}

End response

-(void) Urlsession: (Nsurlsession *) session Task: (Nsurlsessiontask *) Task Didcompletewitherror: (Nserror *) Error {

if (Error = = nil) {

Nsdictionary *dict = [nsjsonserialization JSONObjectWithData:self.resultdata options: (nsjsonreadingallowfragments) Error:nil];

NSLog (@ "Dictionary =%@", dict);

}

}

//Fourth method : Follow the Nsurlconnectiondatadelegate protocol

#pragma post async:

//The first type : follow the Nsurlconnectiondatadelegate protocol

-(Ibaction) Posty: (ID) Sender {

NSString *string = @ "Http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?";

Nsurl *url = [Nsurl urlwithstring:string];

Nsmutableurlrequest *request = [Nsmutableurlrequest Requestwithurl:url];

[Nsurlconnection connectionwithrequest:request delegate:self];

NSString *datastr = @ "date=20131129&startrecord=1&len=5&udid=1234567890&terminaltype=iphone& cid=213 ";

NSData *postdata = [Datastr datausingencoding:nsutf8stringencoding];

[Request sethttpmethod:@ "POST"];

[Request Sethttpbody:postdata];

}

-(void) connection: (Nsurlconnection *) connection didreceiveresponse: (Nsurlresponse *) response{

Self.resultdata = [Nsmutabledata data];

}

-(void) connection: (Nsurlconnection *) connection didreceivedata: (NSData *) data{

[Self.resultdata Appenddata:data];

}

-(void) connectiondidfinishloading: (nsurlconnection *) connection{

Nsdictionary *dic = [nsjsonserialization jsonobjectwithdata:_resultdata options: (nsjsonreadingallowfragments) Error: NIL];

NSLog (@ "%@", DIC);

}

//second type : Session

-(Ibaction) post: (ID) Sender {

Nsurlsession *session = [Nsurlsession sharedsession];

NSString *str = @ "Http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?";

Nsurl *url = [Nsurl urlwithstring:str];

Nsmutableurlrequest *urlrequest = [Nsmutableurlrequest Requestwithurl:url];

NSString *datastring = @ "Date=20131129&startrecord=1&len=5&udid=1234567890&terminaltype=iphone &cid=213 ";

NSData *pdata = [datastring datausingencoding:nsutf8stringencoding];

[URLRequest sethttpmethod:@ "POST"];

[URLRequest Sethttpbody:pdata];

Nsurlsessiontask *task = [Session datataskwithrequest:urlrequest completionhandler:^ (NSData * _Nullable data, Nsurlresponse * _nullable response, Nserror * _nullable error) {

if (Error = = nil) {

Nsdictionary *dic1 = [nsjsonserialization jsonobjectwithdata:data options: (nsjsonreadingallowfragments) Error:nil];

NSLog (@ "%@", Dic1);

}

}];

[Task resume];

}

The third type:

-(Ibaction) POSTT: (ID) Sender {

NSString *urlstring = @ "Http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx";

Nsurl *url = [Nsurl urlwithstring:urlstring];

Nsmutableurlrequest *urlrequest = [Nsmutableurlrequest Requestwithurl:url];

Create a string

NSString *datastring = @ "Date=20131129&startrecord=1&len=5&udid=1234567890&terminaltype=iphone &cid=213 ";

Convert this string to an object of type NSData

NSData *postdata = [datastring datausingencoding:nsutf8stringencoding];

Set the request way in uppercase such as: POST GET

The GET request can not be set, but the POST request must be set

[URLRequest sethttpmethod:@ "POST"];

Put the data you need to upload into urlrequest.

[URLRequest Sethttpbody:postdata];

NSData *resultdata = [nsurlconnection sendasynchronousrequest:urlrequest returningresponse:nil Error:nil];

Nsdictionary *dic1 = [nsjsonserialization jsonobjectwithdata:resultdata options: (nsjsonreadingallowfragments) Error: NIL];

NSLog (@ "dic1====%@", Dic1);

}

//Fourth: Agent protocol for obtaining network data following Nsurlsessiondatadelegate nsurlsession

Get,post synchronous and asynchronous all-in-code method