Mac上传图片

方式一： 以文件流的方法上传图片

- (void)file {
    NSDictionary *params = @{
                             @"access_token":@"d5a05f9f-34a0-4c48-a7a2-90a5818ca9a2"
                             };
    NSString *url = [NSString stringWithFormat:@"%@1.0/user/photo",kRequestUrl];

    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json",
                                                         @"text/html",
                                                         @"image/jpeg",
                                                         @"image/png",
                                                         @"application/octet-stream",
                                                         @"text/json",
                                                         nil];

    NSURLSessionDataTask *task = [manager POST:url parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {

        // image 需要设置成 nsdata
        NSData *imageData = [self.images TIFFRepresentation];
        NSBitmapImageRep *imageRep = [NSBitmapImageRep imageRepWithData:imageData];
        [imageRep setSize:[[_imageView image] size]];
        NSData *imageDatas = [imageRep representationUsingType:NSPNGFileType properties:nil];
        NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
        formatter.dateFormat = @"yyyyMMddHHmmss";


        NSString *str = [formatter stringFromDate:[NSDate date]];
        NSString *fileName = [NSString stringWithFormat:@"%@.jpg", str];
        [formData appendPartWithFileData:imageDatas
                                    name:@"photo"
                                fileName:fileName
                                mimeType:@"image/png"];

    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nonnull responseObject) {
        NSLog(@"%@", responseObject);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        NSLog(@"%@", error);
    }];
}