IOS-network requests

IOS-network requests

Network requests include GET. POST. The steps are as follows: 1> get url. 2> GET request. 3> create a link. 4> return data (proxy ).

1> get the URL.

NSString * urlStr = @ "http://api.zbw.vc/api/vip/GetPhonePadTagMsg"; // when the parameter is Chinese, UTF8 encoding // urlStr = [urlStr encoding: NSUTF8StringEncoding]; NSURL * url = [NSURL URLWithString: urlStr];

2> GET request.

NSURLRequest *request=[NSURLRequest requestWithURL:url];

By default, parameters of the get method only need URL concatenation.

When creating the post method, perform the following operations on the request:

NSString *dataStr=[NSString stringWithFormat:@"UserName=%@&LoginPwd=%@",self.QQField.text,self.pwdField.text];NSData *data=[dataStr dataUsingEncoding:NSUTF8StringEncoding];[request setHTTPBody:data];[request setHTTPMethod:@"POST"];[request setTimeoutInterval:5.0];

3> create a link.

In this case, the created proxy is the class, so the class must inherit the Protocol

NSURLConnection *conn=[NSURLConnection connectionWithRequest:request delegate:self];

4> return data (proxy ). To implement proxy, you must implement the following methods:

// Network return data start-(void) connection :( NSURLConnection *) connection didReceiveResponse :( NSURLResponse *) response // call repeatedly, return data processing-(void) connection :( NSURLConnection *) connection didReceiveData :( NSData *) data // return data end-(void) connectionDidFinishLoading :( NSURLConnection *) connection // handle an error-(void) connection :( NSURLConnection *) connection didFailWithError :( NSError *) error

IOS provides another method for data return.

1. Synchronization>

NSData * data = [NSURLConnection sendSynchronousRequest: request returningResponse: & resp error: & error];

2. asynchronous>

[NSURLConnection sendAsynchronousRequest: request queue: [NSOperationQueue mainQueue] completionHandler: ^ (block)];

The Code is as follows:

# Import "CSZViewController. h "@ interface CSZViewController () @ property (nonatomic, strong) NSMutableData * mutableData; @ end @ implementation CSZViewController-(void) viewDidLoad {[super viewDidLoad];}-(NSURLRequest *) getRequest {NSString * urlStr = @ "http://api.zbw.vc/api/vip/GetPhonePadTagMsg"; // when the parameter is Chinese, UTF8 encoding // urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding]; NSURL * url = [NSURL URLWithString: urlStr]; NSURLRequest * request = [NSURLRequest requestWithURL: url]; return request;}-(IBAction) getLogin {NSURLRequest * request = [self getRequest]; NSURLConnection * conn = [NSURLConnection connectionWithRequest: request delegate: self]; [conn start];}-(NSMutableURLRequest *) getAsyncRequest {NSString * urlStr = @ "http://api.zbw.vc/api/Vip/PostUserInfo "; NSURL * url = [NSURL URLWithStr Ing: urlStr]; NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL: url]; NSString * dataStr = [NSString stringWithFormat: @ "UserName =%@ & LoginPwd =%@", self. QQField. text, self. pwdField. text]; NSData * data = [dataStr dataUsingEncoding: NSUTF8StringEncoding]; [request setHTTPBody: data]; [request setHTTPMethod: @ "POST"]; [request setTimeoutInterval: 5.0]; return request;}-(IBAction) postLogin {[UIAppl Ication sharedApplication]. networkActivityIndicatorVisible = YES; NSMutableURLRequest * request = [self getAsyncRequest]; NSURLConnection * conn = [NSURLConnection connectionWithRequest: request delegate: self]; [conn start) connection :( NSURLConnection *) connection didReceiveResponse :( NSURLResponse *) response {NSLog (@ "% @", @ "Network returned data starts");}-(void) connection :( NSURLConnection *) connection didReceiveData :( NSData *) data {if (_ mutableData = nil) {_ mutableData = [NSMutableData data];} [_ mutableData appendData: data];}-(void) connection :( NSURLConnection *) connection didFailWithError :( NSError *) error {_ mutableData = nil;}-(void) connectionDidFinishLoading :( NSURLConnection *) connection {NSString * str = [[NSString alloc] initWithData: _ mutableData encoding: NSUTF8StringEncoding]; NSLog (@ "% @", str); if (_ mutableDat A! = Nil) {_ mutableData = nil;} [UIApplication sharedApplication]. response = NO;}-(IBAction) clickSync {NSURLRequest * request = [self getRequest]; NSURLResponse * resp = nil; NSError * error = nil; NSData * data = [NSURLConnection sendSynchronousRequest: request returningResponse: & resp error: & error]; if (error! = Nil) {NSLog (@ "% @", error. localizedDescription); return;} if (data! = Nil) {// decodes NSString * respStr = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding]; NSLog (@ "% @", respStr );} else {NSLog (@ "unable to obtain Network Data") ;}}-(IBAction) clickAsync {NSURLRequest * request = [self getAsyncRequest]; [NSURLConnection sendAsynchronousRequest: request queue: [NSOperationQueue mainQueue] completionHandler: ^ (NSURLResponse * response, NSData * data, NSError * connectionError) {if (ConnectionError! = Nil) {NSLog (@ "% @", connectionError. localizedDescription);} else if (response! = Nil) {// decodes NSString * res = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding]; NSLog (@ "% @", res );} else {NSLog (@ "network data not obtained") ;}}] ;}@ end