弹出框的运用

介绍弹出框的用法 - (IBAction)btn:(id)sender { PoPoverViewController * popover = [[[PoPoverViewController alloc]initWithNibName:@"PoPoverViewController" bundle:nil] autorelease]; popover.mainViewController = self; UIPopoverController * pcr = [[[UIPopoverController alloc] initWithContentViewController:popover] autorelease]; popover.popoverCtr = pcr; [pcr retain]; [pcr setPopoverContentSize:CGSizeMake(320, 460)]; [pcr presentPopoverFromRect:button.bounds inView:button permittedArrowDirections:UIPopoverArrowDirectionUp animated:NO]; popover.outbounds = button.bounds; popover.showView = button; } 创建弹出框