未捕获的异常'NSGenericException：应用程序已呈现样式为 UIAlertControllerStyleActionSheet 的 UIAlertController
uncaught exception 'NSGenericException: application has presented a UIAlertController of style UIAlertControllerStyleActionSheet
我正在开发一个应用程序，我 运行 在 iPhone 上运行良好，但是当我尝试 运行 在 iPad 上时它崩溃了
这是我的代码：
- (void)parseCountryStates:(NSDictionary *)json
{
countryPickerView.hidden = TRUE;
NSDictionary *listing = [json objectForKey:@"country"];
countryArray = [listing allValues];
countryIDArray = [listing allKeys];
[countryPickerView reloadAllComponents];
alertController = [UIAlertController
alertControllerWithTitle:@"Select Service Type"
message:nil
preferredStyle:UIAlertControllerStyleActionSheet];
int count = (int)[countryPickerView numberOfRowsInComponent:0];
for (int i = 0; i < count; i++)
{
UIAlertAction* button = [UIAlertAction
actionWithTitle:[[countryPickerView delegate] pickerView:countryPickerView titleForRow:i forComponent:0]
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
countryField.text = [action title];
countryStr = countryField.text;
if ([countryArray containsObject:countryStr]) {
countryidStr = [countryIDArray objectAtIndex:[countryArray indexOfObject:countryStr]];
NSLog(@"CountryidStr %@",countryidStr);
[self getState];
}
}];
[alertController addAction:button];
}
UIAlertAction* cancel = [UIAlertAction
actionWithTitle:@"Cancel"
style:UIAlertActionStyleCancel
handler:^(UIAlertAction * action)
{
// UIAlertController will automatically dismiss the view
}];
[alertController addAction:cancel];
[self presentViewController:alertController animated:true completion:nil];
}
我正在分享它的崩溃日志
*** Terminating app due to uncaught exception 'NSGenericException', reason: 'Your application has presented a UIAlertController () of
style UIAlertControllerStyleActionSheet. The modalPresentationStyle of
a UIAlertController with this style is UIModalPresentationPopover. You
must provide location information for this popover through the alert
controller's popoverPresentationController. You must provide either a
sourceView and sourceRect or a barButtonItem. If this information is
not known when you present the alert controller, you may provide it in
the UIPopoverPresentationControllerDelegate method
-prepareForPopoverPresentation.
实际上 ipad alertcontrollers 是不允许的，相反你可以使用 pop overs 来显示某种警报
程序化
UIViewController *newViewCont = [[UIViewController alloc] init];
newViewCont.view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 180, 180)];
newViewCont.modalPresentationStyle = UIModalPresentationPopover;
[self presentViewController:newViewCont animated:YES completion:nil];
UIPopoverPresentationController *pop = [newViewCont popoverPresentationController];
pop.permittedArrowDirections = UIPopoverArrowDirectionAny;
[pop setSourceView:myButton];
[pop setSourceRect:myButton.bounds];
使用故事板
// grab the view controller we want to show
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
UIViewController *controller = [storyboard instantiateViewControllerWithIdentifier:@"Pop"];
// present the controller
// on iPad, this will be a Popover
// on iPhone, this will be an action sheet
controller.modalPresentationStyle = UIModalPresentationPopover;
[self presentViewController:controller animated:YES completion:nil];
// configure the Popover presentation controller
UIPopoverPresentationController *popController = [controller popoverPresentationController];
popController.permittedArrowDirections = UIPopoverArrowDirectionUp;
popController.delegate = self;
// in case we don't have a bar button as reference
popController.sourceView = self.view;
popController.sourceRect = CGRectMake(30, 50, 10, 10);
关闭弹出窗口
[self dismissViewControllerAnimated:YES completion:nil];
有一个名为 UIPopoverPresentationControllerDelegate 的新协议，它会在由于旋转或界面更改而导致解雇和位置更改时调用。如果我们愿意，我们甚至可以阻止 Popover 被关闭。以下是我们可以实现的三种方法：
- (void)popoverPresentationControllerDidDismissPopover:(UIPopoverPresentationController *)popoverPresentationController {
// called when a Popover is dismissed
}
- (BOOL)popoverPresentationControllerShouldDismissPopover:(UIPopoverPresentationController *)popoverPresentationController {
// return YES if the Popover should be dismissed
// return NO if the Popover should not be dismissed
return YES;
}
- (void)popoverPresentationController:(UIPopoverPresentationController *)popoverPresentationController willRepositionPopoverToRect:(inout CGRect *)rect inView:(inout UIView *__autoreleasing _Nonnull *)view {
// called when the Popover changes position
}
不要忘记遵守协议，并将委托设置为您的反应 class。
将源视图和源矩形添加到您的 alertController。
[[alertController popoverPresentationController] setSourceView:self.view];
[[alertController popoverPresentationController] setSourceRect:CGRectMake(0,0,1,1)];
[[alertController popoverPresentationController] setPermittedArrowDirections:UIPopoverArrowDirectionUp];
[self presentViewController:alertController animated:true completion:nil];
在 iPads 上不允许使用 UIPopovers，但是有一种方法可以做到这一点，正如其他答案所指出的那样。这是 Swift 5.x 版本。
let ac = UIAlertController(title: "Some title goes here", message: nil, preferredStyle: .actionSheet)
ac.addAction(UIAlertAction(title: "Some button name", style: .default) {
[unowned self] _ in
// stuff to do goes here
self.doSomething()
})
// iPad specific code
ac.popoverPresentationController?.sourceView = self.view
let xOrigin = nil // Replace this with one of the lines at the end
let popoverRect = CGRect(x: xOrigin, y: 0, width: 1, height: 1)
ac.popoverPresentationController?.sourceRect = popoverRect
ac.popoverPresentationController?.permittedArrowDirections = .up
present(ac, animated: true)
将 let xOrigin = nil 行替换为以下行之一将控制弹出窗口出现在导航栏下方的位置。如果您的控件位于 iPad.
上的导航栏下方，您还可以将 x 和 y 更改为不同元素的边界或框架中的正确值
左上角
let xOrigin = 0
中上
let xOrigin = self.view.bounds.width / 2
右上角
let xOrigin = self.view.bounds.width
希望这对您有所帮助。
我正在开发一个应用程序，我 运行 在 iPhone 上运行良好，但是当我尝试 运行 在 iPad 上时它崩溃了
这是我的代码：
- (void)parseCountryStates:(NSDictionary *)json
{
countryPickerView.hidden = TRUE;
NSDictionary *listing = [json objectForKey:@"country"];
countryArray = [listing allValues];
countryIDArray = [listing allKeys];
[countryPickerView reloadAllComponents];
alertController = [UIAlertController
alertControllerWithTitle:@"Select Service Type"
message:nil
preferredStyle:UIAlertControllerStyleActionSheet];
int count = (int)[countryPickerView numberOfRowsInComponent:0];
for (int i = 0; i < count; i++)
{
UIAlertAction* button = [UIAlertAction
actionWithTitle:[[countryPickerView delegate] pickerView:countryPickerView titleForRow:i forComponent:0]
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
countryField.text = [action title];
countryStr = countryField.text;
if ([countryArray containsObject:countryStr]) {
countryidStr = [countryIDArray objectAtIndex:[countryArray indexOfObject:countryStr]];
NSLog(@"CountryidStr %@",countryidStr);
[self getState];
}
}];
[alertController addAction:button];
}
UIAlertAction* cancel = [UIAlertAction
actionWithTitle:@"Cancel"
style:UIAlertActionStyleCancel
handler:^(UIAlertAction * action)
{
// UIAlertController will automatically dismiss the view
}];
[alertController addAction:cancel];
[self presentViewController:alertController animated:true completion:nil];
}
我正在分享它的崩溃日志
*** Terminating app due to uncaught exception 'NSGenericException', reason: 'Your application has presented a UIAlertController () of style UIAlertControllerStyleActionSheet. The modalPresentationStyle of a UIAlertController with this style is UIModalPresentationPopover. You must provide location information for this popover through the alert controller's popoverPresentationController. You must provide either a sourceView and sourceRect or a barButtonItem. If this information is not known when you present the alert controller, you may provide it in the UIPopoverPresentationControllerDelegate method -prepareForPopoverPresentation.
实际上 ipad alertcontrollers 是不允许的，相反你可以使用 pop overs 来显示某种警报
程序化
UIViewController *newViewCont = [[UIViewController alloc] init];
newViewCont.view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 180, 180)];
newViewCont.modalPresentationStyle = UIModalPresentationPopover;
[self presentViewController:newViewCont animated:YES completion:nil];
UIPopoverPresentationController *pop = [newViewCont popoverPresentationController];
pop.permittedArrowDirections = UIPopoverArrowDirectionAny;
[pop setSourceView:myButton];
[pop setSourceRect:myButton.bounds];
使用故事板
// grab the view controller we want to show
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
UIViewController *controller = [storyboard instantiateViewControllerWithIdentifier:@"Pop"];
// present the controller
// on iPad, this will be a Popover
// on iPhone, this will be an action sheet
controller.modalPresentationStyle = UIModalPresentationPopover;
[self presentViewController:controller animated:YES completion:nil];
// configure the Popover presentation controller
UIPopoverPresentationController *popController = [controller popoverPresentationController];
popController.permittedArrowDirections = UIPopoverArrowDirectionUp;
popController.delegate = self;
// in case we don't have a bar button as reference
popController.sourceView = self.view;
popController.sourceRect = CGRectMake(30, 50, 10, 10);
关闭弹出窗口
[self dismissViewControllerAnimated:YES completion:nil];
有一个名为 UIPopoverPresentationControllerDelegate 的新协议，它会在由于旋转或界面更改而导致解雇和位置更改时调用。如果我们愿意，我们甚至可以阻止 Popover 被关闭。以下是我们可以实现的三种方法：
- (void)popoverPresentationControllerDidDismissPopover:(UIPopoverPresentationController *)popoverPresentationController {
// called when a Popover is dismissed
}
- (BOOL)popoverPresentationControllerShouldDismissPopover:(UIPopoverPresentationController *)popoverPresentationController {
// return YES if the Popover should be dismissed
// return NO if the Popover should not be dismissed
return YES;
}
- (void)popoverPresentationController:(UIPopoverPresentationController *)popoverPresentationController willRepositionPopoverToRect:(inout CGRect *)rect inView:(inout UIView *__autoreleasing _Nonnull *)view {
// called when the Popover changes position
}
不要忘记遵守协议，并将委托设置为您的反应 class。
将源视图和源矩形添加到您的 alertController。
[[alertController popoverPresentationController] setSourceView:self.view];
[[alertController popoverPresentationController] setSourceRect:CGRectMake(0,0,1,1)];
[[alertController popoverPresentationController] setPermittedArrowDirections:UIPopoverArrowDirectionUp];
[self presentViewController:alertController animated:true completion:nil];
在 iPads 上不允许使用 UIPopovers，但是有一种方法可以做到这一点，正如其他答案所指出的那样。这是 Swift 5.x 版本。
let ac = UIAlertController(title: "Some title goes here", message: nil, preferredStyle: .actionSheet)
ac.addAction(UIAlertAction(title: "Some button name", style: .default) {
[unowned self] _ in
// stuff to do goes here
self.doSomething()
})
// iPad specific code
ac.popoverPresentationController?.sourceView = self.view
let xOrigin = nil // Replace this with one of the lines at the end
let popoverRect = CGRect(x: xOrigin, y: 0, width: 1, height: 1)
ac.popoverPresentationController?.sourceRect = popoverRect
ac.popoverPresentationController?.permittedArrowDirections = .up
present(ac, animated: true)
将 let xOrigin = nil 行替换为以下行之一将控制弹出窗口出现在导航栏下方的位置。如果您的控件位于 iPad.
左上角
let xOrigin = 0
中上
let xOrigin = self.view.bounds.width / 2
右上角
let xOrigin = self.view.bounds.width
希望这对您有所帮助。