ios - 在打开的相机上呈现相机胶卷 UIImagePickerController

Question

在我的应用程序中，我在打开的相机上有一个 cameraOverlayView，带有相机按钮的自定义控件。该应用允许用户在关闭相机之前拍摄多张照片，因此快门按钮不会调用 dismissViewControllerAnimated，而是在您完成拍摄时调用关闭按钮。

现在，相机覆盖层上的按钮之一是画廊按钮，允许用户选择保存的图像而不是拍摄新图像。我尝试了两种不同的方法来完成这项工作，但都失败了。

第一种方法

使用当前呈现叠加层的相同 UIImagePickerController 实例并将 sourceType 切换为库。它确实显示了画廊，但是当点击一张照片时，我不能在不关闭整个叠加层的情况下关闭厨房。

第二种方法

创建一个单独的 UIImagePickerController 实例，将 sourceType 设置为 gallery 并尝试调用 presentViewController，然后失败并显示警告:

"Warning: Attempt to present on whose view is not in the window hierarchy!"

有人能解决这个问题吗？这可能吗？

Answer 1

试试这个~~我认为这是你的目标。

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, strong) UIImagePickerController *imagePicker;

@end

@implementation ViewController

@synthesize imagePicker = _imagePicker;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

}


- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:YES];

    sleep(2);

    _imagePicker = [[UIImagePickerController alloc] init];
    [_imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
    [_imagePicker setDelegate:self];

    UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(10, 50, 100, 30)];
    [button setTitle:@"Library" forState:UIControlStateNormal];
    [button setBackgroundColor:[UIColor darkGrayColor]];
    [button addTarget:self action:@selector(gotoLibrary:) forControlEvents:UIControlEventTouchUpInside];

    [_imagePicker.view addSubview:button];

    [self presentViewController:_imagePicker animated:YES completion:nil];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(IBAction)gotoLibrary:(id)sender
{
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    [imagePicker.view setFrame:CGRectMake(0, 80, 320, 350)];
    [imagePicker setSourceType:UIImagePickerControllerSourceTypeSavedPhotosAlbum];
    [imagePicker setDelegate:self];

    [_imagePicker presentViewController:imagePicker animated:YES completion:nil];
}


- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [picker dismissViewControllerAnimated:YES completion:nil];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [picker dismissViewControllerAnimated:YES completion:nil];
}
@end