1 TodoViewController *contentViewController = [[TodoViewController alloc] init];
2
3 UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:contentViewController];
4
5 navigationController.contentSizeForViewInPopover = CGSizeMake(100, 100); //内容大小
6
7 UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:navigationController];
8
9 popover.popoverContentSize = CGSizeMake(300, 300); //弹出窗口大小，如果屏幕画不下，会挤小的。这个值默认是320x1100
10
11
12
13 CGRect popoverRect = CGRectMake(200, 700, 10, 10);
14
15 [popover presentPopoverFromRect:popoverRect //popoverRect的中心点是用来画箭头的，如果中心点如果出了屏幕，系统会优化到窗口边缘
16
17 inView:self.view //上面的矩形坐标是以这个view为参考的
18
19 permittedArrowDirections:UIPopoverArrowDirectionDown //箭头方向
20
21 animated:YES];
22
23
24
25 [contentViewController release];
26
27 [navigationController release];
