UIImagePickerController 未出现在 iOS 8 中
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/24942282/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
UIImagePickerController not presenting in iOS 8
提问by Dave
Is anyone else having an issue with UIImagePickerControllerin iOS 8? The method below works perfectly well in iOS 7 on an iPad, but I get the following error when I run this in XCode 6 (Beta 3 or 4) when I try to present the picker (last line). If it matters, the selection of the sourceType is coming from an alertView that is presented in the same place.
有没有其他人UIImagePickerController在 iOS 8 中遇到问题？下面的方法在 iPad 上的 iOS 7 中运行良好，但是当我在 XCode 6（Beta 3 或 4）中运行此方法时，当我尝试显示选择器（最后一行）时出现以下错误。如果重要的话，sourceType 的选择来自出现在同一位置的 alertView。
Warning: Attempt to present <UIImagePickerController: 0x7c0ae400> on <CAGUCreateContactViewController: 0x7bf61a00> which is already presenting (null)
Method to open imagePicker.
打开 imagePicker 的方法。
- (void)openPhotoPicker:(UIImagePickerControllerSourceType)sourceType
{
if ([UIImagePickerController isSourceTypeAvailable:sourceType]) {
NSArray *availableMediaTypes = [UIImagePickerController availableMediaTypesForSourceType:sourceType];
if ([availableMediaTypes containsObject:(NSString *)kUTTypeImage]) {
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.modalPresentationStyle = UIModalPresentationFullScreen;
imagePickerController.sourceType = sourceType;
imagePickerController.mediaTypes = @[(NSString *)kUTTypeImage];
imagePickerController.delegate = self;
self.imagePickerController = imagePickerController;
if (sourceType == UIImagePickerControllerSourceTypeCamera) {
[self presentViewController:self.imagePickerController animated:YES completion:nil];
} else {
if (self.popoverVC) {
[self.popoverVC dismissPopoverAnimated:YES];
self.popoverVC = nil;
}
self.popoverVC = [[UIPopoverController alloc] initWithContentViewController:imagePickerController];
[self.popoverVC presentPopoverFromRect:self.nameAndPicCell.picture.frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
}
}
}
}
回答by Ben Lings
I think this is because in iOS 8, alert views and action sheets are actually presented view controllers (UIAlertController). So, if you're presenting a new view controller in response to an action from the UIAlertView, it's being presented while the UIAlertControlleris being dismissed. I worked around this by delaying the presentation of the UIImagePickerControlleruntil the next iteration of the runloop, by doing this:
我认为这是因为在 iOS 8 中，警报视图和操作表实际上是呈现视图控制器 ( UIAlertController)。因此，如果您正在呈现一个新的视图控制器以响应 来自 的操作UIAlertView，则它会在UIAlertController被解除的同时呈现。我通过将 的呈现延迟UIImagePickerController到 runloop 的下一次迭代来解决这个问题，方法是：
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self openPhotoPicker:sourceType];
}];
However, the proper way to fix this is to use the new UIAlertControllerAPI on iOS 8 (i.e. use if ([UIAlertController class])... to test for it). This is just a workaround if you can't use the new API yet.
然而，解决这个问题的正确方法是UIAlertController在 iOS 8 上使用新的API（即使用if ([UIAlertController class])... 来测试它）。如果您还不能使用新 API，这只是一种解决方法。
回答by vedrano
I agree with Ben Lings issue detection. I would suggest a simpler solution in case when using UIActionSheet. I simply moved my code that reacts on Action Sheet selection from:
我同意 Ben Ling 的问题检测。如果使用 UIActionSheet，我会建议一个更简单的解决方案。我只是移动了对操作表选择做出反应的代码：
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex;
{
// my code
}
into:
进入：
- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex; // after animation
{
// my code
}
This way app is guarantied that code will be executed AFTER UIActionSheet animation finishes.
这样应用程序就可以保证在 UIActionSheet 动画完成后执行代码。
Since UIAlertView has similar delegate method:
由于 UIAlertView 有类似的委托方法：
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex; // after animation
{
// my code
}
I suppose that similar solution may apply.
我想类似的解决方案可能适用。
回答by Tunvir Rahman Tusher
Here is a solution that worked for me
这是一个对我有用的解决方案
if([[[UIDevice currentDevice] systemVersion] floatValue]>=8.0)
{
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self presentViewController:cameraUI animated:NO completion:nil];
}];
}
else{
[controller presentViewController:cameraUI animated:NO completion:nil];
}
Remember to alloc cameraUI
记得分配 cameraUI
UIImagePickerController *cameraUI = [[UIImagePickerController alloc] init];
cameraUI.sourceType = UIImagePickerControllerSourceTypeCamera;
Build and Go!
建造并开始！
回答by Piyush Mathur
I was facing the same problem in iOS 8. Then I saw the change log of the latest update to iOS i.e. 8.0.2 on the device.
我在 iOS 8 中遇到了同样的问题。然后我在设备上看到了 iOS 8.0.2 最新更新的更改日志。
It is mentioned in this update that_
本次更新中提到_
"Fixes an issue that prevented some apps from accessing photos from Photo Library"
“修复了阻止某些应用访问照片库中照片的问题”
So test your app using XCode 6 on device with iOS 8.0.2 version it will work fine Don't test it on iOS 8.0 simulator.
因此，在装有 iOS 8.0.2 版本的设备上使用 XCode 6 测试您的应用程序会正常工作 不要在 iOS 8.0 模拟器上测试它。
This helped me, hope the same for you.
这帮助了我，希望同样的话。
回答by Nirav Gadhiya
UIImagePickerController *imagePickerController= [[UIImagePickerController alloc] init];
[imagePickerController setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
// image picker needs a delegate so we can respond to its messages
[imagePickerController setDelegate:self];
self.shouldCallViewWillAppear = NO;
if(IS_IOS8)
{
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
// Place image picker on the screen
[self presentViewController:imagePickerController animated:YES completion:nil];
}];
}
else
{
[self presentViewController:imagePickerController animated:YES completion:nil];
}
回答by Ritu
You can dismiss the presented view controller (if any) by using
您可以通过使用关闭呈现的视图控制器（如果有）
[self.presentedViewController dismissViewControllerAnimated:YES completion:nil];
This worked for me.
这对我有用。
回答by Nikolay Krasnov
All you need to do is dismiss already presented ViewController:
您需要做的就是关闭已经呈现的 ViewController：
if (self.presentedViewController) {
[self.presentedViewController dismissViewControllerAnimated:YES completion:nil];
}
[self openPhotoPicker:sourceType];
If it still produces error, put openPhotoPicker: to completion handler
如果它仍然产生错误，将 openPhotoPicker: 放入完成处理程序
回答by Sebastian Dwornik
I simply did this:
我只是这样做了：
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND,
(unsigned long)NULL), ^(void) {
[self retractActivePopover];
dispatch_async(dispatch_get_main_queue(), ^ {
_activePopover=imagePickerPopover;
UIBarButtonItem *callingButton = (UIBarButtonItem*) sender;
[imagePickerPopover presentPopoverFromBarButtonItem:callingButton permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
});
});
回答by Omid S.
I went through a lot of pain coming up with a solution which works on both iPad and iPhone, this is the final code which some of it comes from comments of other people: the code has some bugs but it's a very good place to start :)
我经历了很多痛苦，想出了一个适用于 iPad 和 iPhone 的解决方案，这是最终的代码，其中一些来自其他人的评论：代码有一些错误，但这是一个很好的起点： )
definitions :
定义：
__weak IBOutlet UIButton *attachButton;
UIImage *image;
button's action :
按钮的动作：
- (IBAction)doAttach:(id)sender {
UIActionSheet *action = [[UIActionSheet alloc] initWithTitle:@"Select image from" delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"From library",@"From camera", nil] ;
[action showInView:self.view];
}
#pragma mark - ActionSheet delegates
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
if( buttonIndex == 1 ) {
AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
if(authStatus == AVAuthorizationStatusAuthorized)
{
NSLog(@"%@", @"You have camera access");
}
else if(authStatus == AVAuthorizationStatusDenied)
{
NSLog(@"%@", @"Denied camera access");
[AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
if(granted){
NSLog(@"Granted access to %@", AVMediaTypeVideo);
} else {
[self.presentedViewController dismissViewControllerAnimated:YES completion:nil];
UIAlertController* alert = [UIAlertController alertControllerWithTitle:@“no camera access“
message: @“if you need to use camera in this application go to settings -> appName -> and turn on camera.”
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:@“ok” style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {
}];
[alert addAction:defaultAction];
[self presentViewController:alert animated:YES completion:nil];
NSLog(@"Not granted access to %@", AVMediaTypeVideo);
return ;
}
}];
}
else if(authStatus == AVAuthorizationStatusRestricted)
{
[self.presentedViewController dismissViewControllerAnimated:YES completion:nil];
UIAlertController* alert = [UIAlertController alertControllerWithTitle:@“no camera access“
message: @“if you need to use camera in this application go to settings -> appName -> and turn on camera.”
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:@“ok” style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {
}];
[alert addAction:defaultAction];
[self presentViewController:alert animated:YES completion:nil];
NSLog(@"%@", @"Restricted, normally won't happen");
}
else if(authStatus == AVAuthorizationStatusNotDetermined)
{
NSLog(@"%@", @"Camera access not determined. Ask for permission.");
[AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
if(granted){
NSLog(@"Granted access to %@", AVMediaTypeVideo);
} else {
NSLog(@"Not granted access to %@", AVMediaTypeVideo);
return ;
}
}];
}
else
{
[self.presentedViewController dismissViewControllerAnimated:YES completion:nil];
UIAlertController* alert = [UIAlertController alertControllerWithTitle:@“No camera access“
message: @“error accusing camera”
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:@“ok” style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {
}];
[alert addAction:defaultAction];
[self presentViewController:alert animated:YES completion:nil];
return;
//NSLog(@"%@", @"Camera access unknown error.");
}
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
UIImagePickerController *pickerView =[[UIImagePickerController alloc]init];
pickerView.allowsEditing = YES;
pickerView.delegate = self;
pickerView.sourceType = UIImagePickerControllerSourceTypeCamera;
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
[ self.presentedViewController dismissViewControllerAnimated:YES completion:nil ];
pickerView.modalPresentationStyle = UIModalPresentationPopover;
UIPopoverPresentationController *popPC = pickerView.popoverPresentationController;
popPC.sourceView = attachButton;
popPC.permittedArrowDirections = UIPopoverArrowDirectionAny;
[self presentViewController:pickerView animated:YES completion:nil];
} else {
[self presentModalViewController:pickerView animated:YES ];
}
}
}else if( buttonIndex == 0 ) {
ALAuthorizationStatus status = [ALAssetsLibrary authorizationStatus];
switch (status) {
case ALAuthorizationStatusRestricted:
case ALAuthorizationStatusDenied:
{
[self.presentedViewController dismissViewControllerAnimated:YES completion:nil];
UIAlertController* alert = [UIAlertController alertControllerWithTitle:@“no access to library”
message: @“if you wish to access photos in this app go to settings -> appName-> and turn on photos .”
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:@“ok” style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {
}];
[alert addAction:defaultAction];
[self presentViewController:alert animated:YES completion:nil];
}
break;
default:
{
UIImagePickerController *pickerView = [[UIImagePickerController alloc] init];
pickerView.allowsEditing = YES;
pickerView.delegate = self;
[pickerView setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
[ self.presentedViewController dismissViewControllerAnimated:YES completion:nil ];
pickerView.modalPresentationStyle = UIModalPresentationPopover;
UIPopoverPresentationController *popup = pickerView.popoverPresentationController;
popup.sourceView = attachButton;
popup.permittedArrowDirections = UIPopoverArrowDirectionAny;
[self presentViewController:pickerView animated:YES completion:nil];
} else {
[self presentModalViewController:pickerView animated:YES ];
}
}
break;
}
}
}
#pragma mark - PickerDelegates
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
[self dismissModalViewControllerAnimated:true];
UIImage * img = [info valueForKey:UIImagePickerControllerEditedImage];
image = img;
}
回答by Vito Ziv
On iOS 8 you should use the new API:
在 iOS 8 上你应该使用新的 API：
if (SYSTEM_VERSION_IOS_8) {
self.imagePickerController.modalPresentationStyle = UIModalPresentationPopover;
UIPopoverPresentationController *popPC = self.imagePickerController.popoverPresentationController;
popPC.barButtonItem = self.popoverItem;
popPC.permittedArrowDirections = UIPopoverArrowDirectionAny;
[self presentViewController:self.imagePickerController animated:YES completion:nil]
}
I recommend you watch the 2014 WWDC session 228 a look in side presentation controllers
