iOS檔案下載功能

/**
下載檔案
*/

• (IBAction)downLoadDoc:(id)sender {
  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
  NSString *documentsDirectory = [paths lastObject];

  NSFileManager *fileManager = [NSFileManager defaultManager];

  NSString *filePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@",@“檔案名字”]]; //docPath為檔案名

  if ([fileManager fileExistsAtPath:filePath]) {
  //檔案已經存在,直接打開
  UIAlertController * alertController = [UIAlertController alertControllerWithTitle:@“是否打開檔案?”.localized message:nil preferredStyle:UIAlertControllerStyleAlert];
  UIAlertAction * cancelAction =[UIAlertAction actionWithTitle:@“取消”.localized style:UIAlertActionStyleCancel handler:nil];
  [alertController addAction:cancelAction];
  [alertController addAction:[UIAlertAction actionWithTitle:@“確定”.localized style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
  [self openDocxWithPath:filePath];
  }]];
  [self presentViewController:alertController animated:YES completion:nil];

  }else {
  //檔案不存在,要下載
  UIAlertController * alertController = [UIAlertController alertControllerWithTitle:@“是否下載并打開檔案?”.localized message:nil preferredStyle:UIAlertControllerStyleAlert];
  UIAlertAction * cancelAction =[UIAlertAction actionWithTitle:@“取消”.localized style:UIAlertActionStyleCancel handler:nil];
  [alertController addAction:cancelAction];
  [alertController addAction:[UIAlertAction actionWithTitle:@“確定”.localized style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
  [self downloadDocxWithDocPath:documentsDirectory fileName:[NSString stringWithFormat:@"%@",@“檔案名字”]];
  }]];
  [self presentViewController:alertController animated:YES completion:nil];

  }
  }

#pragma mark - 下載檔案
-(void)downloadDocxWithDocPath:(NSString *)docPath fileName:(NSString *)fileName{

// fileStr即介面回傳的鏈接
[SVProgressHUD show];
//創建 Request
NSURLRequest* request = [NSURLRequest requestWithURL:[NSURL URLWithString:@“url”]];
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
NSURLSessionDownloadTask *task = [manager downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) {
[SVProgressHUD dismiss];
} destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
[SVProgressHUD dismiss];
NSString *path = [docPath stringByAppendingPathComponent:fileName];
return [NSURL fileURLWithPath:path];
} completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
[SVProgressHUD dismiss];
NSString *name = [filePath path];
[self openDocxWithPath:name];
}];
[task resume];//開始下載 要不然不會進行下載的
}

-(void)openDocxWithPath:(NSString *)filePath {
[self pushSafariWithTitle:@“報價書”.localized urlString:self.model.offer];//用網頁打開
// UIDocumentInteractionController *doc= [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:filePath]];
// doc.delegate = self;
// [doc presentPreviewAnimated:YES];

}

• (UIViewController *)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController *)controller{

  return self;
  }

• (UIView*)documentInteractionControllerViewForPreview:(UIDocumentInteractionController*)controller {

  return self.view;
  }

• (CGRect)documentInteractionControllerRectForPreview:(UIDocumentInteractionController*)controller {

  return CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
  }
  /**
  網路請求
  */

• (nullable NSURLSessionDataTask*)POSTWithURL:(NSString )urlString parameters:(id)parameters success:(nonnull RequestCompletionBlock)success failure:(nonnull RequestFailureBlock)failure{
  [SVProgressHUD show];
  NSURLSessionDataTasktask=nil;
  AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
  AFHTTPResponseSerializer *responseSerializer = [AFHTTPResponseSerializer serializer];
  manager.responseSerializer = responseSerializer;
  //創建你得請求url、設定請求頭
  NSString *URL = urlString;
  NSMutableURLRequest * request = [[AFHTTPRequestSerializer serializer] requestWithMethod:@“post” URLString:URL parameters:parameters error:nil];

  [[manager dataTaskWithRequest:request uploadProgress:^(NSProgress * _Nonnull uploadProgress) {
  NSLog(@"%@",uploadProgress);
  } downloadProgress:^(NSProgress * _Nonnull downloadProgress) {
  NSLog(@"%@",downloadProgress);
  } completionHandler:^(NSURLResponse * _Nonnull response, id _Nullable responseObject, NSError * _Nullable error) {
  [SVProgressHUD dismiss];
  if (!error) {
  NSDictionary*Dic;
  if ([responseObject isKindOfClass:[NSDictionary class]]) {
  Dic=responseObject;
  }else if ([responseObject isKindOfClass:[NSData class]]){
  NSString *result=[[NSString alloc]initWithData:responseObject encoding:NSUTF8StringEncoding];
  result = [result stringByReplacingOccurrencesOfString:@"\r\n" withString:@""];
  result = [result stringByReplacingOccurrencesOfString:@"\n" withString:@""];
  result = [result stringByReplacingOccurrencesOfString:@"\t" withString:@""];
  NSError *error2=nil;
  Dic = [NSJSONSerialization JSONObjectWithData:[result dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingMutableContainers error:&error2];
  }
  if (success) {
  success(Dic);
  }
  }else{//網路出錯
  if (failure) {
  failure(error);
  }
  }
  }]resume];

  return task;
  }

• (void)requestWithUrl:(NSString *)url params:(NSDictionary *)params success:(void(^)(id json))success {
  [RequestViewController POSTWithURL:url parameters:params success:^(NSDictionary * _Nullable request) {
  if (success) {
  success(request);
  }
  } failure:^(NSError * _Nullable error) {
  NSLog(@“錯誤資訊%@”,error);
  }];
  }
• (void)test1{
  [self requestWithUrl:@“http://tankaquan.host5.liuniukeji.net/index.php/Api/IndexApi/homePage” params:@{@“can”:@2} success:^(id _Nonnull json) {
  }];
  }