AFNetWorking的基本使用

如何通过URL获取json数据第一种，利用AFJSONRequestOperation，官方网站上给的例子：    NSString *str=[NSString stringWithFormat:@"https://alpha-api.app.net/stream/0/posts/stream/global"];    NSURL *url = [NSURL URLWithString:[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];    NSURLRequest *request = [NSURLRequest requestWithURL:url];    //    从URL获取json数据    AFJSONRequestOperation *operation1 = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, NSDictionary* JSON) {                NSLog(@"获取到的数据为：%@",JSON);    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id data) {        NSLog(@"发生错误！%@",error);    }];[operation1 start];第二种方法，利用AFHTTPRequestOperation 先获取到字符串形式的数据，然后转换成json格式，将NSString格式的数据转换成json数据，利用IOS5自带的json解析方法：   NSString *str=[NSString stringWithFormat:@"https://alpha-api.app.net/stream/0/posts/stream/global"];    NSURL *url = [NSURL URLWithString:[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];    NSURLRequest *request = [NSURLRequest requestWithURL:url];   AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {        NSString *html = operation.responseString;             NSData* data=[html dataUsingEncoding:NSUTF8StringEncoding];             id dict=[NSJSONSerialization  JSONObjectWithData:data options:0 error:nil];        NSLog(@"获取到的数据为：%@",dict);    }failure:^(AFHTTPRequestOperation *operation, NSError *error) {        NSLog(@"发生错误！%@",error);    }];    NSOperationQueue *queue = [[NSOperationQueue alloc] init];    [queue addOperation:operation];如果发生Error Domain=NSURLErrorDomain Code=-1000 "bad URL" UserInfo=0x14defc80 {NSUnderlyingError=0x14deea10 "bad URL", NSLocalizedDescription=bad URL这个错误，请检查URL编码格式。有没有进行stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding关于其他的各种类型的数据请求就不多说了,大家有兴趣的话可以去这个博客里看看: http://blog.sina.com.cn/s/blog_68661bd80101r1xz.html基于AFDownloadRequestOperation的断点续传整体测试代码如下:#import "RootViewController.h"#import "AFDownloadRequestOperation.h"#define MUSICFile [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/test2.mp4"]//设置文件路径static BOOL a=YES;//控制暂停和下载@interface RootViewController (){    AFDownloadRequestOperation *operation;}@property (strong, nonatomic) IBOutlet UILabel *currtenLabel;//显示当前文件的下载的大小@property (strong, nonatomic) IBOutlet UILabel *totalLabel;//显示整体的文件的大小@property (strong, nonatomic) IBOutlet UILabel *progressLabel;//显示下载的百分比@property (strong, nonatomic) IBOutlet UIProgressView *progressView;//下载的进度条@end@implementation RootViewController- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        // Custom initialization    }    return self;}- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view from its nib.    self.currtenLabel.text = @"CUR : 0 M";    self.totalLabel.text = @"TOTAL : 0 M";}- (IBAction)start:(id)sender {    if (a==YES) {                    NSString * urlStr=@"http://vf1.mtime.cn/Video/2012/04/23/mp4/120423212602431929.mp4";        NSURL *url = [NSURL URLWithString:urlStr];    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:3600];         operation = [[AFDownloadRequestOperation alloc] initWithRequest:request targetPath:MUSICFile shouldResume:YES];        [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {        NSLog(@"下载成功");    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {        NSLog(@"下载失败");    }];        __block RootViewController * this=self;    [operation setProgressiveDownloadProgressBlock:^(NSInteger bytesRead, long long totalBytesRead, long long totalBytesExpected, long long totalBytesReadForFile, long long totalBytesExpectedToReadForFile) {        float percentDone = totalBytesReadForFile/(float)totalBytesExpectedToReadForFile;                this.progressView.progress = percentDone;        this.progressLabel.text = [NSString stringWithFormat:@"%.0f%%",percentDone*100];                this.currtenLabel.text = [NSString stringWithFormat:@"CUR : %lli M",totalBytesReadForFile/1024/1024];        this.totalLabel.text = [NSString stringWithFormat:@"TOTAL : %lli M",totalBytesExpectedToReadForFile/1024/1024];                NSLog(@"------%f",percentDone);        NSLog(@"Operation%i: bytesRead: %d", 1, bytesRead);        NSLog(@"Operation%i: totalBytesRead: %lld", 1, totalBytesRead);        NSLog(@"Operation%i: totalBytesExpected: %lld", 1, totalBytesExpected);        NSLog(@"Operation%i: totalBytesReadForFile: %lld", 1, totalBytesReadForFile);        NSLog(@"Operation%i: totalBytesExpectedToReadForFile: %lld", 1, totalBytesExpectedToReadForFile);    }];    [operation start];        NSLog(@"%@",MUSICFile);    }    else{        [operation pause];    }    a=!a;}//注意:1.如果你的文件已经下载完成过,请更换文件的路径,否则会出现不能断点续传的现象;2.请保证你的下载路径的文件的格式与你保存的路径的文件格式一致;例如 上面的  #define MUSICFile [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/test2.mp4"]//设置文件路径NSString * urlStr=@"http://vf1.mtime.cn/Video/2012/04/23/mp4/120423212602431929.mp4";两者的最后的文件格式都是.mp4基于AFHTTPClient的POST请求代码如下:    NSDictionary *parameters = @{@"key": @"value",                                 @"name": @"pig"};        AFHTTPClient *client= [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:@"http://www.xxxxx.com"]];    [client setParameterEncoding:AFJSONParameterEncoding];    [client postPath:@"xxxxx.php"          parameters:parameters             success:^(AFHTTPRequestOperation *operation, id responseObject) {                 NSLog(@"%@",operation.responseString);                 NSLog(@"%@",operation.request.URL);                                  NSLog(@"提交成功");             }             failure:^(AFHTTPRequestOperation *operation, NSError *error) {                 NSLog(@"%@",operation.request.URL);                 NSLog(@"提交失败");                              }     ];    xxxx代表你要填入的地址,个人把xxxx替换成baidu,结果你成功的.