Question

#!/usr/bin/env python3

from http.server import SimpleHTTPRequestHandler, test
import argparse


class InlineHandler(SimpleHTTPRequestHandler):

    def end_headers(self):
        mimetype = self.guess_type(self.path)
        is_file = not self.path.endswith('/')
        # This part adds extra headers for some file types.
        if is_file and mimetype in ['text/plain', 'application/octet-stream']:
            self.send_header('Content-Type', 'text/plain')
            self.send_header('Content-Disposition', 'inline')
        super().end_headers()

# The following is based on the standard library implementation 
# https://github.com/python/cpython/blob/3.6/Lib/http/server.py#L1195
if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('--bind', '-b', default='', metavar='ADDRESS',
                        help='Specify alternate bind address '
                             '[default: all interfaces]')
    parser.add_argument('port', action='store',
                        default=8000, type=int,
                        nargs='?',
                        help='Specify alternate port [default: 8000]')
    args = parser.parse_args()
    test(InlineHandler, port=args.port, bind=args.bind)

在这一行中，我将null传递给需要非空参数警告的被调用者。有什么想法解决这个问题吗？

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
[self presentViewController:viewController animated:YES completion:nil];
UIImage* image = [info objectForKey:UIImagePickerControllerOriginalImage];
NSData *imageData = UIImageJPEGRepresentation (image, 0.5);
[_webView loadData:imageData MIMEType:@"image/jpeg" textEncodingName:@"UTF-8" baseURL:nil];
}

Answer 1

查看UIWebView的界面。该方法中的所有参数都没有标记为可为空，因此为baseURL传递nil会导致该警告。

虽然，我猜它应该被标记为可以为空，这对Apple来说是个错误。

Image Picker - null传递给需要非null参数的被调用者

1 个答案: