Ios 如何在代码中制作图像选择器

如何在代码中创建图像选择器

我使用iOS 6.0和ARC

我希望能够选择图片并以某种方式获取所选图像的UIImage。

要显示它：

UIImagePickerController *picker;
picker = [[UIImagePickerController alloc] init];
[picker setDelegate:self];
[picker setSourceType:type];

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

要获取UIImage，请执行以下操作：

- (void)imagePickerController:(UIImagePickerController *)thePicker didFinishPickingMediaWithInfo:(NSDictionary *)info
{   
    // Do something with "image"
    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

    // users typically expect that if they took a photo it will be saved
    if (thePicker.sourceType == UIImagePickerControllerSourceTypeCamera) {
        UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
    }

}

在

.h

文件的

@interface ViewController

行中添加代理

如果要将模拟器用作调试器，请确保模拟器中有PIC 然后调用以下方法

- (void)showImagePicker
{
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    imagePicker.delegate = self;
    imagePicker.modalPresentationStyle = UIModalPresentationOverFullScreen;
    [self presentModalViewController:imagePicker animated:YES];
}
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    // Get the selected image.
    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

    [picker dismissModalViewControllerAnimated:YES];
}
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [picker dismissModalViewControllerAnimated:YES];
}

---

基本的实例化如下所示

UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
[imagePicker setDelegate:self];
imagePicker.modalPresentationStyle = UIModalPresentationOverFullScreen;
[self presentViewController:imagePicker animated:YES completion:nil];

有三种方法可以获得图像

//Pick from Camera
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;//Make sure to enable permission for this in info.plist; see: https://stackoverflow.com/a/44690117/2057171

//Pick from all folders in the gallery
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

//Pick from PhotosAlbum(camera roll)
imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;

然后检查源是否存在

//Check Camera available or not
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])

//Check PhotoLibrary available or not
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) 

//Check front Camera available or not
if ([UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront])

您应该实现委托协议以获取用户选择的映像

//Tells the delegate that the user picked a still image or movie.
 (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
  UIImage *selectedImage = [info objectForKey:UIImagePickerControllerOriginalImage];
  [imagepicker dismissModalViewControllerAnimated:YES];
}

//Tells the delegate that the user cancelled the pick operation.
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
}

使用UIImagePickerController的简单教程

---

为了增加这一点，您需要实现

UIImagePickerControllerDelegate

，其中包括在.h文件中声明。您好，我了解到，此错误在该设备上不可用。2013-01-22 21:37:27.745 Grapher2[52960:11303]***由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因是：“在iPad上，UIImagePickerController必须通过UIPopoverController显示”，这是崩溃的线路[self-presentModalViewController:imagePicker动画：是]；你没有指定你在iPad上。这段代码适用于iPhone。你应该看一下UIPopoverController的文档，或者就这个主题发表一个单独的问题。谢谢，我知道它不一样。谢谢，我想这是错的！这是一个普遍的问题，我们都可以得到！