Iphone 在iPad上选择图像
我正试图编写代码，从iPad上的照片库中选择一幅图像。下面是我正在使用的代码（取自苹果网站），但它一直给我一个错误，即在iPad上，UIImagePickerController必须通过UIPopoverController来显示。我尝试更改这一行：Iphone 在iPad上选择图像,iphone,objective-c,ios,xcode,ipad,Iphone,Objective C,Ios,Xcode,Ipad,我正试图编写代码，从iPad上的照片库中选择一幅图像。下面是我正在使用的代码（取自苹果网站），但它一直给我一个错误，即在iPad上，UIImagePickerController必须通过UIPopoverController来显示。我尝试更改这一行：UIImagePickerController*mediaUI=[[UIImagePickerController alloc]init]使用UIPopoverController，但显然我做错了什么，因为它不工作 - (BOOL) selectIm
UIImagePickerController*mediaUI=[[UIImagePickerController alloc]init]- (BOOL) selectImage: (UIViewController*) controller
usingDelegate: (id <UIImagePickerControllerDelegate,
UINavigationControllerDelegate>) delegate {
if (([UIImagePickerController isSourceTypeAvailable:
UIImagePickerControllerSourceTypeSavedPhotosAlbum] == NO)
|| (delegate == nil)
|| (controller == nil))
return NO;
UIImagePickerController *mediaUI = [[UIImagePickerController alloc] init];
mediaUI.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
// Displays saved pictures and movies, if both are available, from the
// Camera Roll album.
mediaUI.mediaTypes =
[UIImagePickerController availableMediaTypesForSourceType:
UIImagePickerControllerSourceTypeSavedPhotosAlbum];
// Hides the controls for moving & scaling pictures, or for
// trimming movies. To instead show the controls, use YES.
mediaUI.allowsEditing = NO;
mediaUI.delegate = delegate;
[controller presentModalViewController: mediaUI animated: YES];
return YES; }
-（BOOL）选择图像：（UIViewController*）控制器
usingDelegate:（id）delegate{
如果（（[UIImagePickerController]资源类型可用：
UIImagePickerControllerSourceTypeSavedPhotosAlbum]==否）
||（委托==零）
||（控制器==零）
返回否；
UIImagePickerController*mediaUI=[[UIImagePickerController alloc]init]；
mediaUI.sourceType=UIImagePickerControllerSourceTypeSavedPhotosAlbum；
//从中显示保存的图片和电影（如果两者都可用）
//相机卷相册。
mediaUI.mediaTypes=
[UIImagePickerController可用于源类型的中间类型：
UIImagePickerControllerSourceTypeSavedPhotosAlbum]；
//隐藏用于移动和缩放图片的控件，或用于
//剪辑电影。若要显示控件，请使用“是”。
mediaUI.allowsdediting=否；
mediaUI.delegate=委托；
[控制器显示ModalViewController:mediaUI动画：是]；
返回YES；}
苹果开发者页面还说：“在iPad上，你可以选择使用一个popover来显示浏览器界面，如initWithContentViewController:中所述，以及UIPopoOverController类参考中的“显示和取消popover”中所述。”我已经读过了，但仍然无法让它工作。任何帮助都将不胜感激。像这样的方法应该可以：
// create an image picker controller
UIImagePickerController *imagePickerController = [[[UIImagePickerController alloc] init] autorelease];
imagePickerController.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
imagePickerController.delegate = self;
// present it in a popover
self.popoverController = [[[UIPopoverController alloc] initWithContentViewController:imagePickerController] autorelease];
self.popoverController.delegate = self;
// I was presenting the popover from a button, but you would set the rect to whatever is appropriate for your app
[self.popoverController presentPopoverFromRect:((UIButton *)sender).bounds inView:sender permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
像这样的方法应该会奏效：
// create an image picker controller
UIImagePickerController *imagePickerController = [[[UIImagePickerController alloc] init] autorelease];
imagePickerController.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
imagePickerController.delegate = self;
// present it in a popover
self.popoverController = [[[UIPopoverController alloc] initWithContentViewController:imagePickerController] autorelease];
self.popoverController.delegate = self;
// I was presenting the popover from a button, but you would set the rect to whatever is appropriate for your app
[self.popoverController presentPopoverFromRect:((UIButton *)sender).bounds inView:sender permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
声明ivar，例如：
UIPopoverController *imagePopover;
[controller presentModal...];
声明ivar，例如：
UIPopoverController *imagePopover;
[controller presentModal...];
我经历了很多痛苦，终于想出了一个既适用于iPad又适用于iPhone的解决方案，这是最后的代码，其中一些代码来自其他人的评论： 代码有一些bug，但这是一个很好的起点：） 它涵盖了所需的权限以及如何管理在ipad上弹出的ViewController 需要以下导入：
#import <AVFoundation/AVFoundation.h>
#import <AssetsLibrary/AssetsLibrary.h>
__weak IBOutlet UIButton *attachButton;
UIImage *image;
- (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;
}
我经历了很多痛苦，终于想出了一个既适用于iPad又适用于iPhone的解决方案，这是最后的代码，其中一些代码来自其他人的评论： 代码有一些bug，但这是一个很好的起点：） 它涵盖了所需的权限以及如何管理在ipad上弹出的ViewController 需要以下导入：
#import <AVFoundation/AVFoundation.h>
#import <AssetsLibrary/AssetsLibrary.h>
__weak IBOutlet UIButton *attachButton;
UIImage *image;
- (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;
}