UIImage返回nil

3 回答

• 0

  我认为你甚至在设置它之前就试图使用imgView.image属性 .

  正在使用此行设置imageView.image

  imgView.image = [info objectForKey:@"UIImagePickerControllerEditedImage"];
  

  将该行移动到方法的开头 . 像这样

  - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
  
   imgView.image = [info objectForKey:@"UIImagePickerControllerEditedImage"];
  
  if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) {
  
      toolbar.hidden = NO;
  
      UIImage *image1 = imgView.image;
      NSString *cachedFolderPath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];
      NSString *cachedImagePath = [cachedFolderPath stringByAppendingPathComponent:@"image1.png"];
      [UIImagePNGRepresentation(image1) writeToFile:cachedImagePath atomically:YES];
  
  }
  

  回复于 2024-04-20T07:37:58+08:00
• 0

  第一次将 imgView.image 设置为值时，接近 imagePickerController:didFinishPickingMediaWithInfo: 的末尾 . 因此，第一次调用此方法时， imgView.image 将成为 nil ，直到最后设置为：

  imgView.image = [info objectForKey:@"UIImagePickerControllerEditedImage"];
  

  回复于 2024-04-20T07:37:58+08:00
• 1

  对不起，要跳过阅读你的代码，发布对我有用的内容 .

  - (UIImage *) getImage{
  
      NSString *pathAndFileName = [[NSBundle mainBundle] pathForResource:@"somefile.png"  ofType:nil];
      if ([[NSFileManager defaultManager] fileExistsAtPath:pathAndFileName])
      {
          return [UIImage imageNamed:@"somefile.png"];
      }
      else{
          NSString *t = [self pathToImageInCache:@"somefile.png"];
  
          if ([[NSFileManager defaultManager] fileExistsAtPath:t]){
              NSLog(@"fiel exists");
              return [[UIImage alloc]initWithContentsOfFile:t];
          }
          else{
              NSLog(@"fiel does not exists");
          }
      }
  
      return nil;
  }
  
  - (NSString *) pathToImageInCache: (NSString *) imageName{
      NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
      NSString *documentsDirectory = [paths objectAtIndex:0];
      documentsDirectory = [documentsDirectory stringByAppendingPathComponent:@""];
  
      NSString *URLImg = [documentsDirectory stringByAppendingPathComponent:imageName];
      return URLImg;
  }
  

  回复于 2024-04-20T07:37:58+08:00