小编Jon*_*han的帖子

在使用jCart时,我注意到它在iPhone上无效.经过一些测试(并在jcart论坛上与开发人员交谈),似乎单击提交按钮时无法调用提交处理程序:

$('form.jcart').submit(function(){...});

我试过将其更改为:

$("form.jcart input[type='submit']").click(function(){...});
// There were some other code changes needed to make this change work,
// but they are omitted for brevity (they don't impact the problem).

这也行不通.我在iPhone上发现了其他有关.submit/onsubmit问题的报告,但似乎没有人找到解决办法吗？

我正在尝试裁剪包含PDF的NSImage.在打印时我正在使用NSImage的drawInRect来让它只绘制我需要的东西 - 而且效果很好.

但是,现在我正试图创建一个仅裁剪区域的新NSImage.我玩了一段时间,然后在CocoaBuilder上找到了这个代码:

- (NSImage *) imageFromRect: (NSRect) rect
{
  NSAffineTransform * xform = [NSAffineTransform transform];

  // translate reference frame to map rectangle 'rect' into first quadrant
  [xform translateXBy: -rect.origin.x
                  yBy: -rect.origin.y];

  NSSize canvas_size = [xform transformSize: rect.size];

  NSImage * canvas = [[NSImage alloc] initWithSize: canvas_size];
  [canvas lockFocus];

  [xform concat];

  // Get NSImageRep of image
  NSImageRep * rep = [self bestRepresentationForDevice: nil];

  [rep drawAtPoint: NSZeroPoint];

  [canvas unlockFocus];
  return [canvas autorelease];
}

这样可行,但返回的NSImage模糊,不再适合打印.有任何想法吗？