objective-c - iOS:尝试在应用程序中使用相机时 View Controller 崩溃。

Question

我有一个按钮，当用户按下它时，他会导航到相机拍照。

当他拍照时，他按下“完成”并返回到 Controller 。但是，当发生这种情况时，导航栏会在屏幕上升起，低于电话所具有的电池/信号栏。奇怪的是，这种情况发生在 4/4s 上，但在 3gs 上却没有

Answer 1

在不了解更多细节的情况下很难回答这个问题，但这里有一些我用来调出相机，拍照，然后成功关闭相机的代码。一行代码即可调用该方法:[self takePhoto];

- (void) takePhoto {

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        //Clear out the UI first

        UIImagePickerController *picker = [[UIImagePickerController alloc] init];

        picker.delegate = self;

        picker.sourceType = UIImagePickerControllerSourceTypeCamera;
        //picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; -> use this if you want them to select from the library
        [self presentViewController:picker animated:YES completion:nil];
    } else {
        //Device does not support a camera, show a message if desired
    }

}

然后你需要一个委托(delegate)来完成这一切，以便程序知道在拍摄或选择图像时要做什么以及如何关闭，这就是这段代码的内容:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    self.workingImage = nil;

    //I grab the image and store globally, but first I manually scale and rotate it if necessary    
    self.workingImage = [self scaleAndRotateImage:[info objectForKey:UIImagePickerControllerOriginalImage]];

    //I display the image in my UI view, so this chunk of code will size it properly
    CGRect bound;
    bound.origin = CGPointZero;
    bound.size = img.size;
    imageView.bounds = bound;

    //Set the UI image view and dismiss the controller
    [imageView setImage:self.workingImage];
    [picker dismissModalViewControllerAnimated:YES];

}

显然，请确保您的 Controller .h 正确实现委托(delegate)，如下所示:

@interface ViewController : UIViewController<UIImagePickerControllerDelegate> { ... }

希望这有帮助吗？