IPad 模拟器正常但 IPad 使用 WKWebview 上传图像时应用程序崩溃
IPad Simulator fine but IPad crashes app when uploading image using WKWebview
背景和简短摘要
我正在使用 WkWebview 来显示我的应用程序的网页。我有它，以便您可以从相机或照片库中选择图像。但是，应用程序在选择图像时崩溃似乎存在问题。
规格
我 运行 在 IOS 10.0.2 平板电脑上，IOS 10.0 在模拟器上使用 Swift 3。我都是 运行来自 XCode 8.
在模拟器上，我在尝试上传图像时收到 "error"
我收到以下消息：
2016-10-19 02:15:36.150670 z4[31561:14708540] [Generic]
Creating an image format with an unknown type is an error
图片很好，我可以用它来上传。我认为这种行为很奇怪，但我读到它与 IOS
上的内存管理有关
在平板电脑上我得到以下信息
Terminating app due to uncaught exception 'NSGenericException',
reason: 'Your application has presented a
UIAlertController (<UIAlertController: 0x151e80350>)
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.'
应用程序似乎在 AppDelegate 中崩溃。我不知道如何去做他们的建议。我也不知道这是否是更深层次问题的一部分，或者我是否遗漏了一些非常简单的东西。
我有与 UIAlerts 相关的代码
以下是我与 UIAlertController 相关的 3 个函数
func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping () -> Void) {
let alertController = UIAlertController(title: nil, message: message, preferredStyle: .actionSheet)
alertController.addAction(UIAlertAction(title: "Ok", style: .default, handler: { (action) in
completionHandler()
}))
self.popoverPresentationController?.sourceView = self.view
self.popoverPresentationController?.sourceRect = self.view.bounds
self.present(alertController, animated: true, completion: nil)
}
func webView(_ webView: WKWebView, runJavaScriptConfirmPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping (Bool) -> Void) {
let alertController = UIAlertController(title: nil, message: message, preferredStyle: .actionSheet)
alertController.addAction(UIAlertAction(title: "Yes", style: .default, handler: { (action) in
completionHandler(true)
}))
alertController.addAction(UIAlertAction(title: "No", style: .default, handler: { (action) in
completionHandler(false)
}))
self.popoverPresentationController?.sourceView = self.view
self.popoverPresentationController?.sourceRect = self.view.bounds
self.present(alertController, animated: true, completion: nil)
}
func webView(_ webView: WKWebView, runJavaScriptTextInputPanelWithPrompt prompt: String, defaultText: String?, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping (String?) -> Void) {
let alertController = UIAlertController(title: nil, message: prompt, preferredStyle: .actionSheet)
alertController.addTextField { (textField) in
textField.text = defaultText
}
alertController.addAction(UIAlertAction(title: "Yes", style: .default, handler: { (action) in
if let text = alertController.textFields?.first?.text {
completionHandler(text)
} else {
completionHandler(defaultText)
}
}))
alertController.addAction(UIAlertAction(title: "No", style: .default, handler: { (action) in
completionHandler(nil)
}))
self.popoverPresentationController?.sourceView = self.view
self.popoverPresentationController?.sourceRect = self.view.bounds
self.present(alertController, animated: true, completion: nil)
}
我该如何处理这个异常并解决这个问题，这样我的应用程序才不会崩溃？如果需要，我可以提供更多详细信息和代码。提前感谢您的帮助。
您必须对代码做一些小改动才能在 iPad 中工作。我正在添加您的代码中缺少的行。
self.popoverPresentationController = alertController.popoverPresentationController
alertController.modalPresentationStyle = .Popover
将这两行代码添加到您的 3 个函数中。
请使用以下 Objective-C 代码作为参考。所以它可能适合你。
- (void)showAlertWithTitle:(NSString *)title withMessage:(NSString *)message withStyle:(UIAlertControllerStyle) alertStyle andActions:(NSArray *)actions andSource:(UIView *)sourceView{
UIAlertController *alertController= [UIAlertController
alertControllerWithTitle:title
message:message
preferredStyle:alertStyle];
for (UIAlertAction *action in actions) {
[alertController addAction:action];
}
UIWindow *alertWindow = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
alertWindow.rootViewController = [[UIViewController alloc]init];
alertWindow.windowLevel = UIWindowLevelAlert + 1;
[alertWindow makeKeyAndVisible];
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
[alertController setModalPresentationStyle:UIModalPresentationPopover];
UIPopoverPresentationController *popPresenter = [alertController
popoverPresentationController];
popPresenter.sourceView = sourceView;
popPresenter.sourceRect = sourceView.bounds;
}
[alertWindow.rootViewController presentViewController:alertController animated:YES completion:nil];
}
- (void)dismissAlertController{
UIWindow *topWindow = [UIApplication sharedApplication].windows.lastObject;
[topWindow.rootViewController dismissViewControllerAnimated:YES completion: nil];}
要使用以上方法，这里是示例。
__weak typeof(self) weakSelf = self;
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
// Cancel button tappped.
[weakSelf dismissAlertController];
}];
UIAlertAction *removeAction = [UIAlertAction actionWithTitle:@"Remove" style:UIAlertActionStyleDestructive handler:^(UIAlertAction *action) {
[weakSelf dismissAlertController];
//Do your actions
}];
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
[self showAlertWithTitle:@"Are you sure you want to remove?" withMessage:nil withStyle:UIAlertControllerStyleActionSheet andActions:@[removeAction,cancelAction]];
}
else if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad){
[self showAlertWithTitle:@"Are you sure you want to remove?" withMessage:nil withStyle:UIAlertControllerStyleActionSheet andActions:@[removeAction,cancelAction] andSource:sender];
}
背景和简短摘要
我正在使用 WkWebview 来显示我的应用程序的网页。我有它，以便您可以从相机或照片库中选择图像。但是，应用程序在选择图像时崩溃似乎存在问题。
规格
我 运行 在 IOS 10.0.2 平板电脑上，IOS 10.0 在模拟器上使用 Swift 3。我都是 运行来自 XCode 8.
在模拟器上，我在尝试上传图像时收到 "error"
我收到以下消息：
2016-10-19 02:15:36.150670 z4[31561:14708540] [Generic]
Creating an image format with an unknown type is an error
图片很好，我可以用它来上传。我认为这种行为很奇怪，但我读到它与 IOS
上的内存管理有关在平板电脑上我得到以下信息
Terminating app due to uncaught exception 'NSGenericException',
reason: 'Your application has presented a
UIAlertController (<UIAlertController: 0x151e80350>)
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.'
应用程序似乎在 AppDelegate 中崩溃。我不知道如何去做他们的建议。我也不知道这是否是更深层次问题的一部分，或者我是否遗漏了一些非常简单的东西。
我有与 UIAlerts 相关的代码
以下是我与 UIAlertController 相关的 3 个函数
func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping () -> Void) {
let alertController = UIAlertController(title: nil, message: message, preferredStyle: .actionSheet)
alertController.addAction(UIAlertAction(title: "Ok", style: .default, handler: { (action) in
completionHandler()
}))
self.popoverPresentationController?.sourceView = self.view
self.popoverPresentationController?.sourceRect = self.view.bounds
self.present(alertController, animated: true, completion: nil)
}
func webView(_ webView: WKWebView, runJavaScriptConfirmPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping (Bool) -> Void) {
let alertController = UIAlertController(title: nil, message: message, preferredStyle: .actionSheet)
alertController.addAction(UIAlertAction(title: "Yes", style: .default, handler: { (action) in
completionHandler(true)
}))
alertController.addAction(UIAlertAction(title: "No", style: .default, handler: { (action) in
completionHandler(false)
}))
self.popoverPresentationController?.sourceView = self.view
self.popoverPresentationController?.sourceRect = self.view.bounds
self.present(alertController, animated: true, completion: nil)
}
func webView(_ webView: WKWebView, runJavaScriptTextInputPanelWithPrompt prompt: String, defaultText: String?, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping (String?) -> Void) {
let alertController = UIAlertController(title: nil, message: prompt, preferredStyle: .actionSheet)
alertController.addTextField { (textField) in
textField.text = defaultText
}
alertController.addAction(UIAlertAction(title: "Yes", style: .default, handler: { (action) in
if let text = alertController.textFields?.first?.text {
completionHandler(text)
} else {
completionHandler(defaultText)
}
}))
alertController.addAction(UIAlertAction(title: "No", style: .default, handler: { (action) in
completionHandler(nil)
}))
self.popoverPresentationController?.sourceView = self.view
self.popoverPresentationController?.sourceRect = self.view.bounds
self.present(alertController, animated: true, completion: nil)
}
我该如何处理这个异常并解决这个问题，这样我的应用程序才不会崩溃？如果需要，我可以提供更多详细信息和代码。提前感谢您的帮助。
您必须对代码做一些小改动才能在 iPad 中工作。我正在添加您的代码中缺少的行。
self.popoverPresentationController = alertController.popoverPresentationController
alertController.modalPresentationStyle = .Popover
将这两行代码添加到您的 3 个函数中。
请使用以下 Objective-C 代码作为参考。所以它可能适合你。
- (void)showAlertWithTitle:(NSString *)title withMessage:(NSString *)message withStyle:(UIAlertControllerStyle) alertStyle andActions:(NSArray *)actions andSource:(UIView *)sourceView{
UIAlertController *alertController= [UIAlertController
alertControllerWithTitle:title
message:message
preferredStyle:alertStyle];
for (UIAlertAction *action in actions) {
[alertController addAction:action];
}
UIWindow *alertWindow = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
alertWindow.rootViewController = [[UIViewController alloc]init];
alertWindow.windowLevel = UIWindowLevelAlert + 1;
[alertWindow makeKeyAndVisible];
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
[alertController setModalPresentationStyle:UIModalPresentationPopover];
UIPopoverPresentationController *popPresenter = [alertController
popoverPresentationController];
popPresenter.sourceView = sourceView;
popPresenter.sourceRect = sourceView.bounds;
}
[alertWindow.rootViewController presentViewController:alertController animated:YES completion:nil];
}
- (void)dismissAlertController{
UIWindow *topWindow = [UIApplication sharedApplication].windows.lastObject;
[topWindow.rootViewController dismissViewControllerAnimated:YES completion: nil];}
要使用以上方法，这里是示例。
__weak typeof(self) weakSelf = self;
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
// Cancel button tappped.
[weakSelf dismissAlertController];
}];
UIAlertAction *removeAction = [UIAlertAction actionWithTitle:@"Remove" style:UIAlertActionStyleDestructive handler:^(UIAlertAction *action) {
[weakSelf dismissAlertController];
//Do your actions
}];
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
[self showAlertWithTitle:@"Are you sure you want to remove?" withMessage:nil withStyle:UIAlertControllerStyleActionSheet andActions:@[removeAction,cancelAction]];
}
else if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad){
[self showAlertWithTitle:@"Are you sure you want to remove?" withMessage:nil withStyle:UIAlertControllerStyleActionSheet andActions:@[removeAction,cancelAction] andSource:sender];
}