隐藏/显示 iPhone 相机光圈/快门动画

Question

我无法隐藏我的应用程序的 iPhone 相机快门打开动画。 我正在使用 UIImagePickerController 访问 iphone 相机并使用我自己的覆盖控制器。 有没有办法在相机启动时删除初始快门（也称为虹膜）动画。 谢谢

[编辑]

对于那些想知道如何更改相机虹膜动画的人。

在相机虹膜动画开始之前调用以下函数。

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    // Here is were I make the camera preview fit the entire screen. 
    // This might violate the "don't change the view hierarchy"-rule. 
    // So I am not sure if it is valid for App Store commitment.
    // However, the NSLogs are used to
    // figure out which subview is the actual Camera Preview which turns out 
    // to be the PLPreviewView. (uncomment to se the printouts).
    // Change it's size to fit the entire screen (and scale it accordingly
    // to avoid distorted image

    NSLog(@"WillShowViewController called...");

    NSLog(@"VC:view:subviews\n %@\n\n", [[viewController view] subviews]);

    NSLog(@"VC:view:PLCameraView:subviews\n %@\n\n", [[[[viewController view] subviews] objectAtIndex: 0] subviews]);

    NSLog(@"VC:view:PLCameraView:PLPreviewView:subviews\n %@\n\n", [[[[[[viewController view] subviews] objectAtIndex: 0] subviews] objectAtIndex: 0] subviews]);
    NSLog(@"VC:view:PLCameraView:PLCropOverLay:subviews\n %@\n\n", [[[[[[viewController view] subviews] objectAtIndex: 0] subviews] objectAtIndex: 1] subviews]);
    NSLog(@"VC:view:PLCameraView:UIImageView:subviews\n %@\n\n", [[[[[[viewController view] subviews] objectAtIndex: 0] subviews] objectAtIndex: 2] subviews]);

}

在上面的函数中，您可以使用普通的 NSMuatableArray 语法（如 objectAtIndex）来遍历每一层，

希望这可以帮助您。

问候，

安库尔

Answer 1

使用这个答案作为起点，我终于解决了这个问题：

注意：这显然不符合 3.3.1 标准。

1. 监听 UIImagePickerController 上的 UINavigationControllerDidShowViewControllerNotification >，以及全局的 PLCameraViewIrisAnimationDidEndNotification。

2. 遍历视图层次结构（从主 UIWindow 开始）寻找 PLCameraView。保存主 UIWindow 视图的索引，因为稍后您将需要它。

3. 从其superView 中删除PLCameraView。如果需要，可在全局索引 0 处插入您自己的视图。

4. 虹膜动画完成后，删除您的视图并在其原始索引处重新添加 PLCameraView。

Answer 2

遇到类似的情况：我希望当我拍摄由 UIImagePickerController 的 self.cameraOverlayView 中的按钮触发的照片时出现快门。到达此页面，做了一些额外的研究并得出了这个解决方案。

概要：

@interface MyController : UIImagePickerController
...    
- (id) init {
...
    self.cameraOverlayView = _my_overlay_;
    self.showsCameraControls = NO;
...
}
... 
- (void) onMyShutterButton {
    [self takePicture]; 
        // You want the shutter animation to happen now.
        // .. but it does not.
}

解决方案：

// Some constants for the iris view and selector
NSString* kIrisViewClassName = @"PLCameraIrisAnimationView";
SEL kIrisSelector = NSSelectorFromString(@"animateIrisOpen");

@implementation MyController {
...
    UIView* iris_;
}
- (void) viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    // Find the iris view in the siblings of your overlay view
    for (UIView* view in self.cameraOverlayView.superview.subviews) {
        if ([kIrisViewClassName isEqualToString:[[view class] description]]) {
            // It will be hidden by 'self.showsCameraControls = NO'.
            view.hidden = false;   
            // Extra precautions - as this is undocumented.  
            if ([view respondsToSelector:kIrisSelector]) {
                iris_ = view;
            }
            break;
        }
    }
}
- (void) animateIrisOpen {
    if (iris_) {
        [iris_ performSelector:kIrisSelector];
    }
}
...
- (void) onMyShutterButton {
    [self takePicture]; 
    [self animateIrisOpen];   // Voila - the shutter happens
}

Answer 3

我对此进行了一些混乱，但将视图生命周期方法的各种组合发送到图像选择器。 （viewWillAppear、viewDidAppear 等）但我不记得哪些最终起作用了。

Answer 4

抱歉这么晚才回复。我找到了解决方案，我玩弄了cameraView的视图层次结构，并在所有内容的顶部添加了我自己的层。动画在那里发生，一旦快门打开，最顶层就被移除。如果有人需要有关代码的任何进一步帮助，请告诉我，我将提供确切的步骤和语法。

-安库尔

Answer 5

joshwa 的答案在虹膜动画期间完全隐藏了整个相机视图。出于我的目的，我需要可见的相机视图，但没有虹膜动画。通过对他的方法进行一些调整，我能够实现这一目标。正如其他人所指出的，这在应用程序商店中可能允许也可能不允许，因为我们正在扰乱视图层次结构并监听未记录的通知。

需要 3 个 ivars：

UIImagePickerController *imagePickerController;
UIView *plCameraIrisAnimationView;  // view that animates the opening/closing of the iris
UIImageView *cameraIrisImageView;  // static image of the closed iris

隐藏关闭的虹膜图像并删除动画视图。我也尝试简单地隐藏动画视图，但动画仍然可见：

- (void)receivedNavigationControllerDidShowViewControllerNotification:(NSNotification *)notification {
    UIView *view = imagePickerController.view;
    [plCameraIrisAnimationView release];
    plCameraIrisAnimationView = nil;
    cameraIrisImageView = nil;
    while (view.subviews.count && (view = [view.subviews objectAtIndex:0])) {
        if ([[[view class] description] isEqualToString:@"PLCameraView"]) {
            for (UIView *subview in view.subviews) {
                if ([subview isKindOfClass:[UIImageView class]]) {
                    cameraIrisImageView = (UIImageView *)subview;
                }
                else if ([[[subview class] description] isEqualToString:@"PLCropOverlay"]) {
                    for (UIView *subsubview in subview.subviews) {
                        if ([[[subsubview class] description] isEqualToString:@"PLCameraIrisAnimationView"]) {
                            plCameraIrisAnimationView = [subsubview retain];
                        }
                    }
                }
            }
        }
    }
    cameraIrisImageView.hidden = YES;
    [plCameraIrisAnimationView removeFromSuperview];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"UINavigationControllerDidShowViewControllerNotification" object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receivedPLCameraViewIrisAnimationDidEndNotification:) name:@"PLCameraViewIrisAnimationDidEndNotification" object:nil];
}

当动画结束时，取消隐藏虹膜图像并重新添加动画视图：

- (void)receivedPLCameraViewIrisAnimationDidEndNotification:(NSNotification *)notification {
    cameraIrisImageView.hidden = NO;

    UIView *view = imagePickerController.view;
    while (view.subviews.count && (view = [view.subviews objectAtIndex:0])) {
        if ([[[view class] description] isEqualToString:@"PLCameraView"]) {
            for (UIView *subview in view.subviews) {
                if ([[[subview class] description] isEqualToString:@"PLCropOverlay"]) {
                    [subview insertSubview:plCameraIrisAnimationView atIndex:1];
                    [plCameraIrisAnimationView release];
                    plCameraIrisAnimationView = nil;
                    break;
                }
            }
        }
    }

    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"PLCameraViewIrisAnimationDidEndNotification" object:nil];
}

Answer 6

在相机虹膜动画开始之前调用以下函数。

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    // Here is were I make the camera preview fit the entire screen. 
    // This might violate the "don't change the view hierarchy"-rule. 
    // So I am not sure if it is valid for App Store commitment.
    // However, the NSLogs are used to
    // figure out which subview is the actual Camera Preview which turns out 
    // to be the PLPreviewView. (uncomment to se the printouts).
    // Change it's size to fit the entire screen (and scale it accordingly
    // to avoid distorted image

    NSLog(@"WillShowViewController called...");

    NSLog(@"VC:view:subviews\n %@\n\n", [[viewController view] subviews]);

    NSLog(@"VC:view:PLCameraView:subviews\n %@\n\n", [[[[viewController view] subviews] objectAtIndex: 0] subviews]);

    NSLog(@"VC:view:PLCameraView:PLPreviewView:subviews\n %@\n\n", [[[[[[viewController view] subviews] objectAtIndex: 0] subviews] objectAtIndex: 0] subviews]);
    NSLog(@"VC:view:PLCameraView:PLCropOverLay:subviews\n %@\n\n", [[[[[[viewController view] subviews] objectAtIndex: 0] subviews] objectAtIndex: 1] subviews]);
    NSLog(@"VC:view:PLCameraView:UIImageView:subviews\n %@\n\n", [[[[[[viewController view] subviews] objectAtIndex: 0] subviews] objectAtIndex: 2] subviews]);

}

在上面的函数中，您可以使用普通的 NSMuatableArray 语法（如 objectAtIndex）来遍历每一层，

希望这可以帮助您。

问候，

安库尔

Answer 7

为了阐述 Catalin 的答案（顺便说一句，这很棒），我发现如果您稍微更改方法“animateIrisOpen”，演示文稿会好一点……但很明显。

- (void) animateIrisOpen {
    if (iris_) {
        iris_.hidden = NO;
        [iris_ performSelector:kIrisSelector];
    }
}