Iphone iPad上的弹出控制问题！

我试图通过UIPopover加载视图，但我的应用程序在点击popover按钮后崩溃，我试图解决它，但我不明白！这是我的密码：

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我想你应该把

inView:self

改为

inView:self.view

检查图片：

(IBAction)calendarPopUp:(id)sender {

 PopViewController *cal = [[PopViewController alloc]init];
//The compiler tells me the problem comes from this line :
 UIPopoverController *popOver = [[UIPopoverController alloc] initWithContentViewController:cal];
 [popOver setDelegate:self];
 [popOver presentPopoverFromRect:CGRectMake(113, 64, 226, 129) inView:self permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES];
 [popOver setPopoverContentSize:CGSizeMake(226, 129)];
}