应用程序在加载模式窗口时崩溃

Question

所以我刚开始使用Xcode并试图修复现有的应用程序。我遇到的麻烦是将HTML文件加载到模态窗口中。

这是我认为相关的代码：

-(void) loadScreen
{
    [super loadScreen];


    formView = [[ontracHazardsFormSheetViewController alloc] init];
    [formView setModalPresentationStyle:UIModalPresentationFormSheet];
    formView.urlToLoad = [self.urlToLoadstringByAppendingString:@"/redzone"];
    formView.cookieValue = self.cookieValue;
    formView.dataObject = self.dataObject;
    formView.htmlString = self.redzoneHTMLString;
    [formView loadScreen];


}
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.


    NSMutableArray *array = [self.navigationItem.rightBarButtonItems mutableCopy];

    UIBarButtonItem *redZoneButton = [[UIBarButtonItem alloc] initWithTitle:@"Red Zones" style:UIBarButtonItemStylePlain target:self action:@selector(displayRedZones:)];
    redZoneButton.tintColor = [UIColor redColor];
    [array addObject:redZoneButton];
    self.navigationItem.rightBarButtonItems = array;

}
-(IBAction)displayRedZones:(id)sender
{
    NSLog(@"red zones");


    [self presentViewController:formView animated:NO completion:nil];


    //ontracWebViewController

}

我有一个启动displayRedZones的按钮，当我使用它时会产生以下崩溃报告：

2016-03-30 14:05:55.539 eCoss[3680:1292033] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', 
reason: '-[_UIAlertControllerActionSheetRegularPresentationController _defaultAnimationController]: unrecognized selector sent to instance 0x15710d10'
*** First throw call stack:
(0x2265c10b 0x21e02e17 0x22661925 0x2265f559 0x2258fc08 0x26b05e03 0x267a7651 0x26b05d69 0x2689a979 0x268c631d 0x268c50b1 0x22e697bd 0x2261fe1f 0x2261fa51 0x2261d89d 0x22570bf9 0x225709e5 0x237bcac9 0x26800ba1 0xd1ac1 0x2221f873)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) 

当应用程序崩溃时，Xcode也会显示：

就像我说的那样，我完全不习惯使用Xcode和IOS开发，所以如果我没有包含一些关键的内容请原谅我并让我知道。

感谢

Answer 1

使用以下代码：

适用于iPhone：

[self presentViewController: formView animated:YES completion:nil];

适用于iPad：

UIPopoverController *popup = [[UIPopoverController alloc] initWithContentViewController:formView];

    [popup presentPopoverFromRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

像，

if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
    [self presentViewController:formView animated:YES completion:nil];
}
else {
    // Change Rect to position Popover
    UIPopoverController *popup = [[UIPopoverController alloc] initWithContentViewController:formView];
    [popup presentPopoverFromRect:CGRectMakeCGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}

注意：根据需求进行修改。