IOS-網路請求

IOS-網路請求

網路請求包括GET.POST兩種方式，其步驟為：1>擷取URL。 2>擷取請求。 3>建立連結。 4>返回資料（代理）。

1>擷取URL。

NSString *urlStr=@"http://api.zbw.vc/api/vip/GetPhonePadTagMsg";//當參數為中文時，用UTF8編碼//urlStr=[urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];NSURL *url=[NSURL URLWithString:urlStr];

2>擷取請求。

NSURLRequest *request=[NSURLRequest requestWithURL:url];

預設get方法的參數只需要URL拼接。

當建立post方法的時候，對request進行如下操作

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>建立連結。

此時，建立的 代理為本類，所以該類必須繼承協議

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

4>返回資料（代理）。實現代理必須實現如下方法

//網路返回資料開始-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response//重複調用，返回資料處理-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data//返回資料結束-(void)connectionDidFinishLoading:(NSURLConnection *)connection//發生錯誤處理方法-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error

IOS提供另一種方法實現資料回傳

1.同步>>

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

2.非同步>>

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

具體代碼如下：

#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";    //當參數為中文時，用UTF8編碼    //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(@"%@",@"網路返回資料開始");}-(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) {        //解碼        NSString *respStr=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];        NSLog(@"%@",respStr);    }    else    {        NSLog(@"擷取不到網路資料");    }    }- (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) {            //解碼            NSString *res=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];            NSLog(@"%@",res);        }else{            NSLog(@"擷取不到網路資料");        }    }];        }@end