ios - UIImagePicker 被选中后重新出现

Question

我有一个 UIImagePicker，它在我选择图像后不断出现。我的代码正在检查摄像头，然后根据模拟器中没有摄像头的事实显示 UIImagePicker。

- (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;
    }
    else {
        self.imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    }
    self.imagePicker.mediaTypes = [NSArray arrayWithObjects:(NSString *)kUTTypeImage, nil];
    [self presentViewController:self.imagePicker animated:NO completion:nil];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [self clear];
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    UIImage *chosenImage = info[UIImagePickerControllerEditedImage];
    self.imageView.image = chosenImage;
    [self dismissViewControllerAnimated:YES completion:nil];
}

我需要强制重新加载我的初始 View 吗？有没有更聪明的方法来做到这一点？

编辑

我向导航栏添加了一个栏按钮，并在该操作上触发了我的代码。这解决了问题，似乎是一种更好的方法。

Answer 1

可能 viewWillAppear 每次 UIImagePickerController 消失时都会被调用 - 因为您放置代码的 View Controller 再次变得可见。

您可以尝试在 viewDidLoad 中创建 UIImagePickerController，或者使用 bool 属性来检查它是否是第一次调用它。