Question

我需要在用户进入ViewControllerA时显示图像选择器，并在用户制作照片并按下“使用照片”按钮后停留在那里。

实际上当用户点击“使用照片”按钮时出现问题，在这种情况下，图像选择器会一次又一次地弹出。我知道这是因为viewWillAppear，但viewDidLoad也不是一个好选择，因为在这种情况下，图像选择器不会出现超过1次。

可能有人可以给我一些指导，如何在没有这个问题的情况下关闭图像选择器？我只想在用户每次进入视图控制器时显示它，并在用户选择图像后关闭它。

- (void)viewWillAppear:(BOOL)animated {

    [super viewWillAppear:animated];
    self.imagePicker = [[UIImagePickerController alloc] init];
    self.imagePicker.delegate = self;
    self.imagePicker.allowsEditing = YES;

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        self.imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;  
    } 
    self.imagePicker.mediaTypes = [NSArray arrayWithObject:(NSString *)kUTTypeImage];

    [self presentViewController:self.imagePicker animated:NO completion:nil];
}

- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    UIImage *choosenImage = info[UIImagePickerControllerEditedImage];
    self.placeholderImg.image = choosenImage;
    [self dismissViewControllerAnimated:YES completion:nil];

}

- (void) imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [self dismissViewControllerAnimated:NO completion:nil];
    [self.tabBarController setSelectedIndex:1]; 
}

Answer 1

在您的视图控制器的.m文件中，您可以声明一个BOOL，如果您已经提交了UIImagePickerController，该@interface MyCustomViewController () { BOOL imagePickerHasBeenPresented; } @end会保持不变。

viewWillAppear

然后在你的- (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; if (imagePickerHasBeenPresented == NO) { imagePickerHasBeenPresented = YES; //Code to present imagePicker } }方法中检查bool：

{{1}}

无法在View Controller中关闭图像选择器

1 个答案: