网络：NSURLSession 上传文件和代理的选择

#import "ViewController.h"#define CZBoundary @"itcast"// NSURLSessionDataDelegate 接收服务器返回的数据// NSURLSessionTaskDelegate  -> NSURLSessionDelegate 上传进度以及HTTPS相当的代理// NSURLSessionDownloadDaskDelegate 下载进度@interface ViewController ()<NSURLSessionTaskDelegate,NSURLSessionDataDelegate>@property (weak, nonatomic) IBOutlet UIProgressView *progressView;@property (nonatomic, strong) NSURLSession *session; // 自定义会话@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.}- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    // NSURL    NSURL *url = [NSURL URLWithString:@"http://localhost/post/upload.php"];    // 创建请求    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];    // http请求方法使用POST    [request setHTTPMethod:@"POST"];    // 告诉服务器我是上传二进制数据    [request setValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@",CZBoundary] forHTTPHeaderField:@"Content-Type"];    // 图片路径    NSString *path = [[NSBundle mainBundle] pathForResource:@"01.mp4" ofType:nil];    // 图片数据    NSData *imageData = [NSData dataWithContentsOfFile:path];    // 拼接好的二进制数据    NSData *uploadData = [self dataWithFileData:imageData fieldName:@"userfile" fileName:@"abc.mp4"];    // 不使用block让代理返回进度    [[self.session uploadTaskWithRequest:request fromData:uploadData]resume];}// 上传进度- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didSendBodyData:(int64_t)bytesSent totalBytesSent:(int64_t)totalBytesSent totalBytesExpectedToSend:(int64_t)totalBytesExpectedToSend {    CGFloat progress = (CGFloat)totalBytesSent / totalBytesExpectedToSend;    NSLog(@"%f",progress);    // 回到主线程刷新UI    dispatch_async(dispatch_get_main_queue(),^{        self.progressView.progress = progress;    });}// 接收到数据- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask    didReceiveData:(NSData *)data {    NSLog(@"接收到数据%zd",data.length);//{}}// 完成了- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error {    NSLog(@"完成了");}- (void)uploadData {    // NSURL    NSURL *url = [NSURL URLWithString:@"http://localhost/post/upload.php"];    // 创建请求    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];    // http请求方法使用POST    [request setHTTPMethod:@"POST"];    // 告诉服务器我是上传二进制数据    [request setValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@",CZBoundary] forHTTPHeaderField:@"Content-Type"];    // 图片路径    NSString *path = [[NSBundle mainBundle] pathForResource:@"image.png" ofType:nil];    // 图片数据    NSData *imageData = [NSData dataWithContentsOfFile:path];    // 拼接好的二进制数据    NSData *uploadData = [self dataWithFileData:imageData fieldName:@"userfile" fileName:@"abc.png"];    [[[NSURLSession sharedSession] uploadTaskWithRequest:request fromData:uploadData completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {        NSLog(@"%@ -- %@",response,[NSJSONSerialization JSONObjectWithData:data options:0 error:NULL]);    }] resume];}/** 返回上传需要的二进制数据 1. 文件的数据 2. 后台给的字段名 3. 上传的文件名 */- (NSData *)dataWithFileData:(NSData *)fileData fieldName:(NSString *)fieldName fileName:(NSString *)fileName {    // 可变的二进制数据    NSMutableData *dataM = [NSMutableData data];    // 可变字符串用来拼接数据    NSMutableString *strM = [NSMutableString stringWithFormat:@"--%@\r\n",CZBoundary];    [strM appendFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\" \r\n",fieldName,fileName];    // application/octet-stream 代表上传所有的二进制格式都支持    [strM appendString:@"Content-Type: application/octet-stream \r\n\r\n"];    //    NSLog(@"%@",strM);    // 把前面一部份数据先拼接    [dataM appendData:[strM dataUsingEncoding:NSUTF8StringEncoding]];    // 拼接文件的二进制数据    [dataM appendData:fileData];    // 清空可变字符串之后，再设置内容为\r\n    [strM setString:@"\r\n"];    [strM appendFormat:@"--%@--",CZBoundary];    // 把最后一部份加到二进制数据中    [dataM appendData:[strM dataUsingEncoding:NSUTF8StringEncoding]];    //    NSLog(@"%@",strM);    return dataM.copy;}- (NSURLSession *)session {    if (_session == nil) {        _session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:nil];    }    return _session;}@end