3

現在のアプリケーションでは、ユーザーがオンラインのイメージ サービスにイメージを送信できるようにしています。ユーザーは、フォト アルバムから選択するか、カメラで写真を撮ることができます。

しかし、私には問題があります。使用されているデバイスにカメラがなく、ユーザーが写真を撮ることを選択した場合、アプリケーションはクラッシュします。デバイスが cameraDevice を使用できるかどうかを判断できる必要があります。

以下は、ユーザーがさまざまなオプションを選択できるようにする UIActionSheet を表示するための現在のコードです。

#pragma mark -
#pragma mark UIImagePickerController
- (IBAction)ImagePicker {
UIActionSheet *sheet = [[UIActionSheet alloc] 
                        initWithTitle:@"" delegate:self 
                        cancelButtonTitle:@"Cancel" 
                        destructiveButtonTitle:nil 
                        otherButtonTitles:@"Choose An Existing Photo", @"Take A Photo", nil];
sheet.actionSheetStyle = UIActionSheetStyleDefault;
[sheet showInView:self.view];
[sheet release];
}

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {

if (buttonIndex == 0) {
    //Okay the UIImagePickerControllerSourceTypeSavedPhotosAlbum displays the 
    NSLog(@"Album");
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    [self presentModalViewController:picker animated:YES];
    [picker release];

} else if (buttonIndex == 1) {
    NSLog(@"Camera");
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.sourceType = UIImagePickerControllerSourceTypeCamera;
    [self presentModalViewController:picker animated:YES];
    [picker release];
}
}

前もって感謝します！

4

4 に答える 4

6 
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { NSLog(@"No camera!"); }
于 2010-10-14T10:42:17.720 に答える
1

このようなものも機能します：

NSString* b1 = @"Get from album";
NSString* b2 = nil;

BOOL cameraAvailable = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];

if ( cameraAvailable ) {
     b2 = @"Take a photo";   
}

UIActionSheet * sheet = [[UIActionSheet alloc] initWithTitle: alertTitle
                                                    delegate: self
                                           cancelButtonTitle: @"Cancel"
                                      destructiveButtonTitle: nil
                                           otherButtonTitles: b1, b2, nil];         
[sheet showInView: self.view];
[sheet release];
于 2012-04-05T09:27:30.990 に答える
0

忘れないでください、タグと新しいプロパティ、sheet と呼ばれる UIActionSheet を追加する必要がありました。次のコードは、完全にシームレスにすべてを機能させる方法です。

#pragma mark -
#pragma mark UIImagePickerController
- (IBAction)ImagePicker {

if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
sheet = [[UIActionSheet alloc] 
                        initWithTitle:@"" delegate:self 
                        cancelButtonTitle:@"Cancel" 
                        destructiveButtonTitle:nil 
                        otherButtonTitles:@"Choose An Existing Photo", nil];
sheet.actionSheetStyle = UIActionSheetStyleDefault;
[sheet showInView:self.view];
sheet.tag = 0;
[sheet release];
}

else {
    sheet = [[UIActionSheet alloc] 
                            initWithTitle:@"" delegate:self 
                            cancelButtonTitle:@"Cancel" 
                            destructiveButtonTitle:nil 
                            otherButtonTitles:@"Choose An Existing Photo", @"Take A Photo", nil];
    sheet.actionSheetStyle = UIActionSheetStyleDefault;
    [sheet showInView:self.view];
    sheet.tag = 1;
    [sheet release];
}

}

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {

switch (sheet.tag) {
    case 0:
        if (buttonIndex == 0) {
            //Okay the UIImagePickerControllerSourceTypeSavedPhotosAlbum displays the 
            NSLog(@"Album");
            UIImagePickerController *picker = [[UIImagePickerController alloc] init];
            picker.delegate = self;
            picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
            [self presentModalViewController:picker animated:YES];
            [picker release];

        }
        break;
    case 1:
        if (buttonIndex == 0) {
            //Okay the UIImagePickerControllerSourceTypeSavedPhotosAlbum displays the 
            NSLog(@"Album");
            UIImagePickerController *picker = [[UIImagePickerController alloc] init];
            picker.delegate = self;
            picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
            [self presentModalViewController:picker animated:YES];
            [picker release];

        } else if (buttonIndex == 1) {
            NSLog(@"Camera");
            UIImagePickerController *picker = [[UIImagePickerController alloc] init];
            picker.delegate = self;
            picker.sourceType = UIImagePickerControllerSourceTypeCamera;
            [self presentModalViewController:picker animated:YES];
            [picker release];
        }
        break;
}
}
于 2010-10-14T11:00:10.947 に答える