IOS-网络请求

来源：互联网发布：png软件下载编辑：程序博客网时间：2024/06/04 23:02

网络请求包括GET.POST两种方式，其步骤为：1>获取URL。 2>获取请求。 3>创建链接。 4>返回数据（代理）。

1>获取URL。

NSString *urlStr=@"http://api.zbw.vc/api/vip/GetPhonePadTagMsg";//当参数为中文时，用UTF8编码//urlStr=[urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];NSURL *url=[NSURL URLWithString:urlStr];

2>获取请求。

NSURLRequest *request=[NSURLRequest requestWithURL:url];

默认get方法的参数只需要URL拼接。

当创建post方法的时候，对request进行如下操作

<span style="font-size:18px;">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];</span>

3>创建链接。

此时，创建的代理为本类，所以该类必须继承协议<NSURLConnectionDataDelegate>

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

4>返回数据（代理）。实现代理必须实现如下方法

<span style="font-size:18px;">//网络返回数据开始-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response//重复调用，返回数据处理-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data//返回数据结束-(void)connectionDidFinishLoading:(NSURLConnection *)connection//发生错误处理方法-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error</span>

IOS提供另一种方法实现数据回传

1.同步>>

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

2.异步>>

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

具体代码如下：

<span style="color:#333333;">#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";    //当参数为中文时，用UTF8编码    //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 URLWithString: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 {        [UIApplication sharedApplication].networkActivityIndicatorVisible=YES;        NSMutableURLRequest *request = [self getAsyncRequest];    NSURLConnection *conn=[NSURLConnection connectionWithRequest:request delegate:self];    [conn start];}-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{    NSLog(@"%@",@"网络返回数据开始");}-(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 (_mutableData!=nil) {        _mutableData=nil;    }    [UIApplication sharedApplication].networkActivityIndicatorVisible=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) {        //解码        NSString *respStr=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];        NSLog(@"%@",respStr);    }    else    {        NSLog(@"获取不到网络数据");    }    }- (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) {            //解码            NSString *res=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];            NSLog(@"%@",res);        }else{            NSLog(@"获取不到网络数据");        }    }];        }@end</span>

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