在 iphone 模拟器上使用 UIImagePickerController

Posted 2023-03-07

【中文标题】在 iphone 模拟器上使用 UIImagePickerController

【英文标题】：Use the UIImagePickerController on a iphone simulator

【发布时间】：2012-02-07 08:14:55

【问题描述】：

我有方法，从画廊或相机拍照

-(IBAction) getPhoto:(id) sender 
  UIImagePickerController * picker = [[UIImagePickerController alloc] init];
  picker.delegate = self;

  if((UIButton *) sender == choosePhotoBtn) 
        picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
   else 
        picker.sourceType = UIImagePickerControllerSourceTypeCamera;
  

  [self presentModalViewController:picker animated:YES];

但是当我在模拟器上运行它时，代码不起作用。它在picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum 和picker.sourceType = UIImagePickerControllerSourceTypeCamera 中不起作用

是模拟器的问题还是代码的问题？

【问题讨论】：

这里是答案：***.com/questions/833210/…

您使用的是 iPhone 模拟器还是 iPad 模拟器。

Iphone 模拟器。我将 'UIImagePickerControllerSourceTypeSavedPhotosAlbum' 更改为 'UIImagePickerControllerSourceTypePhotoLibrary' 但库是空的，应该在哪里添加照片，然后在应用程序中使用它们

是的，因为你使用的是模拟器。

【参考方案1】：

试试这个，

 if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary])
        
            picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        
        else
        
            picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
        
        [self.navigationController presentModalViewController:picker animated:NO];

如果您正在为 iPad 创建应用程序。您必须在 popOver 控件中显示图库。

【讨论】：

[self.navigationController presentModalViewController:picker animated:NO] - 不起作用，但 [self presentModalViewController:picker animated:YES] 没问题。关于 sourceType 我也有同样的问题。为什么 UIImagePickerControllerSourceTypePhotoLibrary 是空的？我应该如何在运行应用程序之前添加照片

【参考方案2】：

Swift 3/4/5 版本：

if UIImagePickerController.isSourceTypeAvailable(.camera) 
    picker.sourceType = .camera

else 
    picker.sourceType = .savedPhotosAlbum // or .photoLibrary

Swift 2 版本：

if UIImagePickerController.isSourceTypeAvailable(.Camera) 
    picker.sourceType = .Camera

else 
    picker.sourceType = .SavedPhotosAlbum // or .PhotoLibrary

在模拟器中，你不能使用cameraCaptureMode和showsCameraControls。

【参考方案3】：

在模拟器中，您的 picker.sourceType = UIImagePickerControllerSourceTypeCamera 不会被调用，因为模拟器中没有可用的相机。检查源类型是否可用以避免崩溃也是一个好习惯。

#import <MobileCoreServices/UTCoreTypes.h>
….
 if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
        
            UIImagePickerController *imagePickerCamera =[[UIImagePickerController alloc] init];
            imagePickerCamera.delegate = self;
            imagePickerCamera.mediaTypes = [NSArray arrayWithObjects:(NSString *) kUTTypeImage,nil];
            imagePickerCamera.allowsEditing = YES;
            imagePickerCamera.sourceType = UIImagePickerControllerSourceTypeCamera;

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

    else if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum])
        
            UIImagePickerController *imagePickerAlbum =[[UIImagePickerController alloc] init];
            imagePickerAlbum.delegate = self;
            imagePickerAlbum.mediaTypes = [NSArray arrayWithObjects:(NSString *) kUTTypeImage,nil];
            imagePickerAlbum.allowsEditing = YES;
            imagePickerAlbum.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

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

【讨论】：

查看此链接 - developer.apple.com/library/ios/#documentation/UIKit/Reference/…

【参考方案4】：

与上述答案类似，但我发现这更容易。如果设备没有摄像头（如模拟器），则显示弹出警报。 Sam 代码，不同用法：

//button if to take a photo
- (IBAction)takePhoto:(id)sender 

//checks if device has a camera
    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) 
        UIAlertView *noCameraAlert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"You don't have a camera for this device" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];

        //shows above alert if there's no camera
        [noCameraAlert show];
    

    //otherwise, show a modal for taking a photo
    else 
        UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
        imagePicker.delegate = self;
        imagePicker.allowsEditing = YES;
        imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

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