Xcode 7.3，iOS 9.3.1
我想在用户即将拍照时以及在编辑照片后使用两个自定义叠加视图。要更改叠加层，我想知道是否有UIImagePickerControllerDelegate的回调方法可以让我知道用户何时开始编辑图片，或者用户点击了拍照按钮。
我所知道的唯一方法是：
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
我看过这里：UIImagePickerController with cameraOverlayView focusses when button in overlay is tapped，How to know I tap "taking photo button" with UIImagePicker和iOS - Taking A Picture After Button Tap in UIImagePickerController CustomOverlayView。
或许有一种方法可以通过添加观察者来从标准按钮获取点击事件。
请帮忙！提前谢谢。
答案 0 :(得分：2)
您可以使用UINavigationControllerDelegate来使用UIImagePickerController时必须实施的[...]didShowViewController[...]。像这样实现委托方法- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
NSLog(@"%@", [viewController class]);
}
UIImagePickerControllerSourceTypePhotoLibrary生成以下输出（使用模拟器，选择sourceType作为template <int S, int E, int step>
struct iter {
auto next() { return iter<std::min(E, S+step), E, step>{}; }
};
并导航如下：相册概述＆gt;特定相册＆gt;编辑特定照片）：
2016-04-08 00：19：36.882 ImagePicker [44578：4705834] PUUIAlbumListViewController
2016-04-08 00：19：41.341 ImagePicker [44578：4705834] PUUIMomentsGridViewController
2016-04-08 00：19：47.929 ImagePicker [44578：4705834] PUUIImageViewController
答案 1 :(得分：1)
Xcode 8.2.1，iOS10.2.1
在实施之前，请阅读早期版本的解决方案以了解基础知识。谢谢！问题是各种子视图的一些名称已从iOS 9.3.1更改为iOS 10.2.1。
以下是完整代码（请参阅下面的插入位置），替换下面的“// Code goes here”：
for (UIView *subviewImagePickerControllerView in self.imagePickerController.view.subviews)
{
if ([subviewImagePickerControllerView.class.description isEqualToString:@"UINavigationTransitionView"])
{
for (UIView *subviewUINavigationTransitionView in subviewImagePickerControllerView.subviews)
{
if ([subviewUINavigationTransitionView.class.description isEqualToString:@"UIViewControllerWrapperView"])
{
for (UIView *subviewUIViewControllerWrapperView in subviewUINavigationTransitionView.subviews)
{
if ([subviewUIViewControllerWrapperView.class.description isEqualToString:@"CAMCameraViewControllerContainerView"])
{
for (UIView *subviewCAMCameraViewControllerContainerView in subviewUIViewControllerWrapperView.subviews)
{
if ([subviewCAMCameraViewControllerContainerView.class.description isEqualToString:@"CAMViewfinderView"])
{
for (UIView *subviewCAMViewfinderView in subviewCAMCameraViewControllerContainerView.subviews)
{
if ([subviewCAMViewfinderView.class.description isEqualToString:@"CAMBottomBar"])
{
for (UIView *subviewCAMBottomBar in subviewCAMViewfinderView.subviews)
{
if ([subviewCAMBottomBar.class.description isEqualToString:@"CUShutterButton"] && [subviewCAMBottomBar.class isSubclassOfClass:[UIButton class]])
{
UIButton *shutterButton = (UIButton *)subviewCAMBottomBar;
[shutterButton addTarget:self action:@selector(touchUpInsideCMKShutterButton) forControlEvents:UIControlEventTouchUpInside];
}
else
{
nil;
}
}
}
}
}
else if ([subviewCAMCameraViewControllerContainerView.class.description isEqualToString:@"PLCropOverlay"])
{
for (UIView *subviewPLCropOverlay in subviewCAMCameraViewControllerContainerView.subviews)
{
if ([subviewPLCropOverlay.class.description isEqualToString:@"PLCropOverlayBottomBar"])
{
for (UIView *subviewPLCropOverlayBottomBar in subviewPLCropOverlay.subviews)
{
if ([subviewPLCropOverlayBottomBar.class.description isEqualToString:@"PLCropOverlayPreviewBottomBar"])
{
for (UIView *itemPLCropOverlayPreviewBottomBar in subviewPLCropOverlayBottomBar.subviews)
{
if ([itemPLCropOverlayPreviewBottomBar.class isSubclassOfClass:[UIButton class]])
{
UIButton *buttonPLCropOverlay = (UIButton *)itemPLCropOverlayPreviewBottomBar;
if ([buttonPLCropOverlay.titleLabel.text isEqualToString:@"Retake"])
{
UIButton *retakeButton = buttonPLCropOverlay;
[retakeButton addTarget:self action:@selector(touchUpInsideButtonRetake) forControlEvents:UIControlEventTouchUpInside];
}
else
{
nil;
}
}
else
{
nil;
}
}
}
else
{
nil;
}
}
}
else
{
nil;
}
}
}
else
{
nil;
}
}
}
else
{
nil;
}
}
}
else
{
nil;
}
}
}
else
{
nil;
}
}
Xcode 7.3，iOS9.3.1
我必须让这个工作，所以我花了很多时间搞清楚这一点。
它的要点是，我在显示UIImagePickerController后查看视图层次结构，查找CMKShutterButton和重新标记按钮，标题为“重新拍摄”，然后我附加一个选择器按钮的动作，就像这样......
[shutterButton addTarget:self action:@selector(touchUpInsideCMKShutterButton) forControlEvents:UIControlEventTouchUpInside];
[retakeButton addTarget:self action:@selector(touchUpInsideButtonRetake) forControlEvents:UIControlEventTouchUpInside];
将下面的代码放入显示图像选择器后调用的完成块中：
[self presentViewController:self.imagePickerController animated:true completion:^(void){
//Code goes here
}
以下是完整的代码，替换上面的“// Code goes here”：
for (UIView *subviewImagePickerControllerView in self.imagePickerController.view.subviews)
{
if ([subviewImagePickerControllerView.class.description isEqualToString:@"UINavigationTransitionView"])
{
for (UIView *subviewUINavigationTransitionView in subviewImagePickerControllerView.subviews)
{
if ([subviewUINavigationTransitionView.class.description isEqualToString:@"UIViewControllerWrapperView"])
{
for (UIView *subviewUIViewControllerWrapperView in subviewUINavigationTransitionView.subviews)
{
if ([subviewUIViewControllerWrapperView.class.description isEqualToString:@"PLImagePickerCameraView"])
{
for (UIView *subviewPLImagePickerCameraView in subviewUIViewControllerWrapperView.subviews)
{
if ([subviewPLImagePickerCameraView.class.description isEqualToString:@"CMKBottomBar"])
{
for (UIView *itemCMKBottomBar in subviewPLImagePickerCameraView.subviews)
{
if ([itemCMKBottomBar.class.description isEqualToString:@"CMKShutterButton"] && [itemCMKBottomBar.class isSubclassOfClass:[UIButton class]])
{
UIButton *shutterButton = (UIButton *)itemCMKBottomBar;
[shutterButton addTarget:self action:@selector(touchUpInsideCMKShutterButton) forControlEvents:UIControlEventTouchUpInside];
}
else
{
nil;
}
}
}
else if ([subviewPLImagePickerCameraView.class.description isEqualToString:@"PLCropOverlay"])
{
for (UIView *subviewPLCropOverlay in subviewPLImagePickerCameraView.subviews)
{
if ([subviewPLCropOverlay.class.description isEqualToString:@"PLCropOverlayBottomBar"])
{
for (UIView *subviewPLCropOverlayBottomBar in subviewPLCropOverlay.subviews)
{
if ([subviewPLCropOverlayBottomBar.class.description isEqualToString:@"PLCropOverlayPreviewBottomBar"])
{
for (UIView *itemPLCropOverlayPreviewBottomBar in subviewPLCropOverlayBottomBar.subviews)
{
if ([itemPLCropOverlayPreviewBottomBar.class isSubclassOfClass:[UIButton class]])
{
UIButton *buttonPLCropOverlay = (UIButton *)itemPLCropOverlayPreviewBottomBar;
if ([buttonPLCropOverlay.titleLabel.text isEqualToString:@"Retake"])
{
UIButton *retakeButton = buttonPLCropOverlay;
[retakeButton addTarget:self action:@selector(touchUpInsideButtonRetake) forControlEvents:UIControlEventTouchUpInside];
}
else
{
nil;
}
}
else
{
nil;
}
}
}
else
{
nil;
}
}
}
else
{
nil;
}
}
}
else
{
nil;
}
}
}
else
{
nil;
}
}
}
else
{
nil;
}
}
}
else
{
nil;
}
}
这是我附加的方法，它位于呈现图像选择器控制器的视图控制器中：
- (void)touchUpInsideCMKShutterButton
{
NSLog(@"Take");
}
- (void)touchUpInsideButtonRetake
{
NSLog(@"Re-take");
}
希望这有助于某人！感谢。
答案 2 :(得分：1)
UIImagePickerControllerDelegate很差，但您可以通过添加观察者来处理它：
斯威夫特3：
NotificationCenter.default.addObserver(forName: NSNotification.Name(rawValue: "_UIImagePickerControllerUserDidCaptureItem"), object:nil, queue:nil, using: { note in
//Do something
})
目标-C：
[[NSNotificationCenter defaultCenter] addObserverForName:@"_UIImagePickerControllerUserDidCaptureItem" object:nil queue:nil usingBlock:^(NSNotification * _Nonnull note) {
//Do something
}];