iOS UIPopOverController的使用问题
今天不经意间发现了UIPopOverController的使用,使用iphone模拟器会出现Crash
crash的原因如下:
'NSInvalidArgumentException', reason: '-[UIPopoverController initWithContentViewController:] called when not running under UIUserInterfaceIdiomPad.'
所以必须使用ipad进行浏览,
所以在代码中使用UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad
所以在viewDidLoad的代码如下:
- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. UIView *container = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 416)]; container.backgroundColor = [UIColor lightGrayColor]; [self.view addSubview:container]; UIButton *tmpButton = [[UIButton alloc] initWithFrame:CGRectMake(10, 50, 100, 50)]; tmpButton.backgroundColor = [UIColor brownColor]; [tmpButton setTitle:@"点击显示" forState:UIButtonTypeCustom]; [tmpButton addTarget:self action:@selector(btnTest:) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:tmpButton]; [tmpButton release]; popTableView = [[PopTableViewController alloc] init]; if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { popOverController = [[UIPopoverController alloc] initWithContentViewController:popTableView]; popOverController.delegate = self; popOverController.popoverContentSize = CGSizeMake(100, 300); } }
在btnTest方法中实现popOverController显示
代码如下:
-(void)btnTest:(UIButton *)sender { CGRect presentFromRect = CGRectMake(sender.frame.origin.x, sender.frame.origin.y, sender.frame.size.width, sender.frame.size.height); [popOverController presentPopoverFromRect:presentFromRect inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES]; }
现在可以使用ipad运行下显示了。在iphone模拟器中不会出现crash,但是不会弹出popOverController,显示不出需要的效果
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