Question

我有一个设置视图来更改个人资料图片以及封面图片，我把它设置成这样：

- (IBAction)coverPressed:(id)sender
{
    buttonPressed = 1;
    if (self.image == nil) {
        self.imagePicker = [[UIImagePickerController alloc] init];
        self.imagePicker.delegate = self;
        self.imagePicker.allowsEditing = NO;

        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
            [self performSelector:@selector(takePhoto) withObject:nil];
        } else {
            [self performSelector:@selector(chooseFromLibrary) withObject:nil];
        }

        self.imagePicker.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:self.imagePicker.sourceType];
        [self presentViewController:self.imagePicker animated:NO completion:nil];
    }
}

- (void) avatarPressed:(id)sender
{
    buttonPressed = 2;
    if (self.image == nil) {
        self.imagePicker = [[UIImagePickerController alloc] init];
        self.imagePicker.delegate = self;
        self.imagePicker.allowsEditing = NO;

        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
            [self performSelector:@selector(takePhoto) withObject:nil];
        } else {
            [self performSelector:@selector(chooseFromLibrary) withObject:nil];
        }

        self.imagePicker.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:self.imagePicker.sourceType];
        [self presentViewController:self.imagePicker animated:NO completion:nil];
    }
}

-(void)takePhoto
{
    UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
    {
        [imagePickerController setSourceType:UIImagePickerControllerSourceTypeCamera];
    }

    // image picker needs a delegate,
    [imagePickerController setDelegate:self];

    // Place image picker on the screen
    [self presentViewController:imagePickerController animated:YES completion:nil];
}



-(void)chooseFromLibrary
{
    UIImagePickerController *imagePickerController= [[UIImagePickerController alloc]init];
    [imagePickerController setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];

    // image picker needs a delegate so we can respond to its messages
    [imagePickerController setDelegate:self];

    // Place image picker on the screen
    [self presentViewController:imagePickerController animated:YES completion:nil];
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    if (buttonPressed == 2) {
        [self dismissViewControllerAnimated:YES completion:nil];
        image = [info objectForKey:UIImagePickerControllerOriginalImage];

        avatar = [image thumbnailImage:200 transparentBorder:0 cornerRadius:0 interpolationQuality:kCGInterpolationMedium];
        avatarSmall = [image thumbnailImage:40 transparentBorder:0 cornerRadius:0 interpolationQuality:kCGInterpolationMedium];
    }
    if (buttonPressed == 1) {
        [self dismissViewControllerAnimated:YES completion:nil];
        image = [info objectForKey:UIImagePickerControllerOriginalImage];

        cover = [image thumbnailImage:320 transparentBorder:0 cornerRadius:0 interpolationQuality:kCGInterpolationMedium];
    }

}

但如果按下＆＃34;更改个人资料图片＆＃34; UIButton并选择一张图片，我再也无法按下＆＃34;更改封面图片＆＃34;或者反之，我在我的代码中做了什么以使它只出现一次有什么不对吗？

Answer 1

在这些方法中......

- (void) avatarPressed:(id)sender
{
    buttonPressed = 2;
    if (self.image == nil) {
        self.imagePicker = [[UIImagePickerController alloc] init];
        self.imagePicker.delegate = self;
        self.imagePicker.allowsEditing = NO;

        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
             [self performSelector:@selector(takePhoto) withObject:nil];
        } else {
             [self performSelector:@selector(chooseFromLibrary) withObject:nil];
        }

        self.imagePicker.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:self.imagePicker.sourceType];
        [self presentViewController:self.imagePicker animated:NO completion:nil];
     }
 }

您正在执行几个选择器，它们自己呈现一个图像选择器，然后直接在那些if语句之后呈现另一个图像选择器。

认为你的方法应该是这样的

- (void) avatarPressed:(id)sender
{
    buttonPressed = 2;

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        [self performSelector:@selector(takePhoto) withObject:nil];
    } else {
        [self performSelector:@selector(chooseFromLibrary) withObject:nil];
    }

 }

UIImagePicker只出现一次

1 个答案: