Asynchronous GEi (2) thread

Initializes the URL to an OC string object.

NSString * urlstring = @ "Http://image.zcool.com.cn/56/13/1308200901454.jpg";
NSString * newurlstring = [urlstring stringbyaddingpercentescapesusingencoding:nsutf8stringencoding];

Building a Network URL object

Nsurl * URL = [Nsurl urlwithstring:newurlstring];

Create a network request

Nsurlrequest * request = [Nsurlrequest Requestwithurl:url cachepolicy:nsurlrequestreloadignoringlocalcachedata TIMEOUTINTERVAL:10];

Set up Proxy

[Nsurlconnection connectionwithrequest:request delegate:self];

Obey the agreement

@interface Viewcontroller () <NSURLConnectionDataDelegate>
@end

To implement the Proxy method:

triggered when a server response is received
-(void) connection: (Nsurlconnection *) connection didreceiveresponse: (Nsurlresponse *) response
{
Receive File size
length = [Response expectedcontentlength];
NSLog (@ "%lld", length);

When a server response is received, space is opened for data, and then the server returns
Self.data = [Nsmutabledata data];
}

Triggered when a server returns data, possibly a resource fragment (the method repeats at this time)
-(void) connection: (Nsurlconnection *) connection didreceivedata: (NSData *) data
{
Stitching data
[Self.data Appenddata:data];

CGFloat rate = self.data.length * 1.0/LENGTH;
NSLog (@ "%g", rate);
}

triggered when the server returns all data. Data return complete
-(void) connectiondidfinishloading: (nsurlconnection *) connection
{
self.data;//is all the data returned by the server

Analytical
Nsdictionary * dic = [nsjsonserialization JSONObjectWithData:self.data options:nsjsonreadingmutablecontainers Error: NIL];
NSLog (@ "%@", DIC);

At this point the data has been fully obtained, if the data is Tableviewcell set the contents of the cell, you need to refresh the cell

[TableView Reloaddata];

}

triggered when a server connection error occurs
-(void) connection: (Nsurlconnection *) connection didfailwitherror: (Nserror *) error
{
NSLog (@ "%d", 4);
}

Asynchronous GEi (2) thread