我有一个UIPickerView显示在a内UIPopoverController。尺寸UIPickerView are: 320x216。由于某种原因，UIPickerView似乎是适当高度的 3/5，并且UIPopoverController一直延伸到屏幕底部。
请参阅下面的代码。
Thanks!
self.picker = [[[UIPickerView alloc] initWithFrame:CGRectMake(0, self.view.bounds.size.height+44, 320, 216)] autorelease];
self.picker.backgroundColor = [UIColor clearColor];
self.picker.showsSelectionIndicator = YES;
self.picker.delegate = self;
self.picker.dataSource = self;
self.picker.transform = CGAffineTransformMakeScale(-1, 1);
UIViewController *pickerController = [[UIViewController alloc] init];
[pickerController setView:self.picker];
UIPopoverController *pickerPopover = [[UIPopoverController alloc] initWithContentViewController:pickerController];
[pickerPopover presentPopoverFromBarButtonItem:sender permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
pickerPopover.delegate = self;
self.popover = pickerPopover;
[pickerController release];
[pickerPopover release];
“压扁”选择器视图的原因似乎是这一行：
[pickerController setView:self.picker];
相反，将选取器视图添加为子视图：
[pickerController.view addSubview:picker];
接下来，要固定弹出窗口高度，请设置popoverContentSize在介绍之前：
pickerPopover.popoverContentSize = picker.frame.size;
另外，修复选择器视图的框架：
CGRectMake(0, self.view.bounds.size.height+44, 320, 216)
to this:
CGRectMake(0, 0, 320, 216)
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