关闭按钮单击时的 UIImagePickerView答案

【问题标题】：Dismiss the UIImagePickerView on button click关闭按钮单击时的 UIImagePickerView
【发布时间】：2014-12-19 17:43:46
【问题描述】：

我正在使用图像选择器拍摄照片并将其保存到数据库中。一旦我将它保存在数据库中，我会放置一个警告视图，说图像已保存，当我单击确定时，我需要关闭图像选择器视图并且我需要呈现另一个视图。

这就是我所拥有的

-(void)viewDidAppear:(BOOL)animated{

[super viewDidAppear:animated];

[self takePic];


}

-(void)takePic{

UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate =self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;

[self presentViewController:picker animated:YES completion:NULL];

}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{

if (alertView.tag==1) {

    if (buttonIndex==0) {
        UIImagePickerController *picker;
         [picker dismissViewControllerAnimated:YES completion:NULL]; // here i am not able to dismiss the image picker view
        Tab *vc=[self.storyboard instantiateViewControllerWithIdentifier:@"Tabbar"];
        [self presentViewController:vc animated:YES completion:nil];

    }
}


}

如果我没有在视图中放置 [self takepic]，我可以关闭选择器视图。

我也试过了

        [picker dismissViewControllerAnimated:YES completion:^{
            [self presentViewController:vc animated:YES completion:NULL];
        }];

但我无法关闭选择器视图。我收到警告：“警告：尝试显示不在窗口层次结构中的视图！”

谁能告诉我，如何关闭选择器视图

【问题讨论】：

标签： ios uiimagepickercontroller

【解决方案1】：

试试这个。我想它会帮助你在您的代码中，您正在通过UIImagePickerController *picker; 获取 UIImagePicker 的新引用您应该关闭相同的图像选择器

-(void)takePicture{

    picker = [[UIImagePickerController alloc] init];
    picker.delegate =self;
    picker.allowsEditing = YES;
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    [self presentViewController:picker animated:YES completion:NULL];

}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{

    if (alertView.tag==1) {

        if (buttonIndex==0) {
            [picker dismissViewControllerAnimated:YES completion:NULL]; // here i am not able to dismiss the image picker view

        }
    }
}

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

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"Hello" delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
    alert.tag = 1;
    [alert show];
}

【讨论】：

【解决方案2】：

您需要创建一个属性来打开和关闭相机

@property (assign) BOOL *makeCameraOff;


-(void)viewDidAppear:(BOOL)animated{


if (makeCameraOff==NO) {

    [self performSelector:@selector(takePic) withObject:nil afterDelay:0.3];
}
}

-(void)takePic{

UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate =self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;

[self presentViewController:picker animated:YES completion:NULL];

}


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

  //here change the BOOL value to YES,so that you can dismiss the camera view
makeCameraOff=YES;

[picker dismissViewControllerAnimated:YES completion:NULL];


 }


- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {


// your code to present the view controller you need;
 }

【讨论】：