objective-c - 在 UIImagePickerController 之后切换 View

Question

我试图让我的应用程序在用户完成选择图像时切换到另一个 View ，但发生的情况是当用户完成选择图像时，它关闭了选择器并返回到相同的 View 。
这是我的代码:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo
{
    [picker dismissModalViewControllerAnimated:YES];

    DrawingViewController *viewController = [self.storyboard instantiateViewControllerWithIdentifier:@"Drawing"];
    viewController.image.image = image;
    [self presentModalViewController:viewController animated:NO];
}

Answer 1

发生这种情况是因为您使用动画关闭了选择器模态视图 Controller 并立即呈现新的 View Controller 。您只能在前一个 View Controller 被关闭后呈现一个新的模态视图 Controller 。 一个解决方案是在没有动画的情况下关闭选择器模式:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo
{
    [picker dismissModalViewControllerAnimated:NO];

    DrawingViewController *viewController = [self.storyboard instantiateViewControllerWithIdentifier:@"Drawing"];
    viewController.image.image = image;
    [self presentModalViewController:viewController animated:NO];
}

另一种解决方案(仅适用于 iOS 5)是使用 dismissViewControllerAnimated: completion: 方法:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo
{
   [picker dismissViewControllerAnimated:YES completion:^(){
        DrawingViewController *viewController = [self.storyboard instantiateViewControllerWithIdentifier:@"Drawing"];
        viewController.image.image = image;
        [self presentModalViewController:viewController animated:NO];
    }];


}