iphone - 进入 UIImagePickerController 编辑模式

Question

我使用 UIImagePickerController (photoPicker) 用相机拍照，然后编辑这些照片 (allowEditing = YES)。用户可以使用 photoPicker.view 中的按钮在相机和库之间切换，但我想在 photoPicker 处于编辑模式时删除此按钮。

在 photoLibrarySourceType 中，选择器使用推送来显示编辑模式，因此它适用于此方法:

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if (navigationController == photoPicker) {
        NSLog(@"navigation ");
        if ([navigationController.viewControllers indexOfObject:viewController] == 1)
        {
            // If second UIViewController, set your overlay.
            NSLog(@"editing");
        }
    }
}

但是在cameraSourceType中，相机和编辑模式之间没有导航。

Answer 1

我想出了一个小技巧，它对我有用。我还是有点新，所以请随意优化，因为我找不到其他方法。

基本思想是在默认相机按钮上创建一个不可见按钮，该按钮执行调用 [uiimagepickercontroller takePicture] 的方法

这是我的示例代码

@implementation myViewController
{
    UIImagePickerController *myImagePickerController; 
    UIButton * fakeCameraButton;


}

- (IBAction)showImagePicker:(id)sender{

    // accessible camera validations implied
    myImagePickerController = [[UIImagePickerController alloc]init];
    myImagePickerController.sourceType=UIImagePickerControllerSourceTypeCamera;       
    myImagePickerController.showsCameraControls = YES;
    myImagePickerController.delegate=self;
    myImagePickerController.allowsEditing=YES; 

    CGFloat myViewHeight = 100; // you play around with the positions to get your desired frame size. This worked for me
    UIView * myView = [[UIView alloc] initWithFrame:CGRectMake(0, myImagePickerController.view.frame.size.height - myViewheight, picker.view.frame.size.width, myViewheight)];

   fakeCameraButton = [[UIButton alloc] initWithFrame:CGRectMake(myView.frame.size.width / 2 - 30, myView.frame.size.height/2-15, 60, 60)];// position it over the default camera button
   [fakeCameraButton addTarget:self action:@selector(cameraButtonPressed) forControlEvents:UIControlEventTouchUpInside];
   [fakeCameraButton setTitle:@"" forState:UIControlStateNormal];

   [myView addSubview:fakeCameraButton];
   myImagePickerController.cameraOverlayView = myView;
   [self presentViewController:myImagePickerController animated:YES completion:nil];


}

-(void)cameraButtonPressed{

    // Make sure you check if camera is ready before this method. 
   [myImagePickerController takePicture];

    // you are in editing/preview mode here if allowsEditing = YES

    // you can remove all your custom overlay views by
    myImagePickerController.cameraOverlay = nil



} 

就像我之前说的，请确保检查相机是否准备就绪。您可以在 stackoverflow 上找到有关如何操作的答案。

此代码可能很糟糕，因此欢迎编辑或替代解决方案。

我需要开发伙伴帮助我了解有关 ios 开发的更多信息并提出问题。有人感兴趣吗？