[英]UIImagePicker allowsEditing stuck in center
我有一個 UIImagePicker 非常適合一種 UIImagePickerControllerSourceTypePhotoLibrary，但是當我使用 UIImagePickerControllerSourceTypeCamera 時，編輯框無法從圖像的中心移動。 因此，如果圖像的高度大於寬度，則用戶無法將編輯框移動到圖像的頂部正方形。
有誰知道為什么會這樣？ 僅當源來自相機而不是庫時才會發生。
編輯：一些代碼！！！
if (actionSheet.tag == 2) {
if (buttonIndex == 0) { // Camera
// Check for camera
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera] == YES) {
// Create image picker controller
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
// Set source to the camera
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
imagePicker.allowsEditing = YES;
// Delegate is self
imagePicker.delegate = self;
// Show image picker
[self presentViewController:imagePicker
animated:YES
completion:^(void) {
}];
}
}
else if (buttonIndex == 1) { // Photo Library
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary] == YES) {
// Create image picker controller
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
// Set source to the camera
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
imagePicker.allowsEditing = YES;
// Delegate is self
imagePicker.delegate = self;
// Show image picker
[self presentViewController:imagePicker
animated:YES
completion:^(void) {
}];
}
}
如您所見，我將它們顯示為完全相同，但相機編輯的行為與照片庫編輯不同。
看起來這種行為只是iOS 6中的一個錯誤......基本上你不能移動編輯框，除非你放大一點，否則它總是彈回中間。 希望他們能盡快解決這個問題。
謝謝你。 此擴展程序有效。 除了我在viewDidLayoutSubviews中添加了方法調用，這樣我就不必每次想要打開圖像選擇器時都調用它。
這是完整的擴展
extension UIImagePickerController {
open override var childForStatusBarHidden: UIViewController? {
return nil
}
open override var prefersStatusBarHidden: Bool {
return true
}
open override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
fixCannotMoveEditingBox()
}
func fixCannotMoveEditingBox() {
if let cropView = cropView,
let scrollView = scrollView,
scrollView.contentOffset.y == 0 {
var top: CGFloat = 0.0
if #available(iOS 11.0, *) {
top = cropView.frame.minY + self.view.safeAreaInsets.top
} else {
// Fallback on earlier versions
top = cropView.frame.minY
}
let bottom = scrollView.frame.height - cropView.frame.height - top
scrollView.contentInset = UIEdgeInsets(top: top, left: 0, bottom: bottom, right: 0)
var offset: CGFloat = 0
if scrollView.contentSize.height > scrollView.contentSize.width {
offset = 0.5 * (scrollView.contentSize.height - scrollView.contentSize.width)
}
scrollView.contentOffset = CGPoint(x: 0, y: -top + offset)
}
DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) { [weak self] in
self?.fixCannotMoveEditingBox()
}
}
var cropView: UIView? {
return findCropView(from: self.view)
}
var scrollView: UIScrollView? {
return findScrollView(from: self.view)
}
func findCropView(from view: UIView) -> UIView? {
let width = UIScreen.main.bounds.width
let size = view.bounds.size
if width == size.height, width == size.height {
return view
}
for view in view.subviews {
if let cropView = findCropView(from: view) {
return cropView
}
}
return nil
}
func findScrollView(from view: UIView) -> UIScrollView? {
if let scrollView = view as? UIScrollView {
return scrollView
}
for view in view.subviews {
if let scrollView = findScrollView(from: view) {
return scrollView
}
}
return nil
}
}
重置contentInset的scrollview ：
extension UIImagePickerController {
func fixCannotMoveEditingBox() {
if let cropView = cropView,
let scrollView = scrollView,
scrollView.contentOffset.y == 0 {
let top = cropView.frame.minY + self.view.safeAreaInsets.top
let bottom = scrollView.frame.height - cropView.frame.height - top
scrollView.contentInset = UIEdgeInsets(top: top, left: 0, bottom: bottom, right: 0)
var offset: CGFloat = 0
if scrollView.contentSize.height > scrollView.contentSize.width {
offset = 0.5 * (scrollView.contentSize.height - scrollView.contentSize.width)
}
scrollView.contentOffset = CGPoint(x: 0, y: -top + offset)
}
DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) { [weak self] in
self?.fixCannotMoveEditingBox()
}
}
var cropView: UIView? {
return findCropView(from: self.view)
}
var scrollView: UIScrollView? {
return findScrollView(from: self.view)
}
func findCropView(from view: UIView) -> UIView? {
let width = UIScreen.main.bounds.width
let size = view.bounds.size
if width == size.height, width == size.height {
return view
}
for view in view.subviews {
if let cropView = findCropView(from: view) {
return cropView
}
}
return nil
}
func findScrollView(from view: UIView) -> UIScrollView? {
if let scrollView = view as? UIScrollView {
return scrollView
}
for view in view.subviews {
if let scrollView = findScrollView(from: view) {
return scrollView
}
}
return nil
}
}
然后調用它
imagePickercontroller.fixCannotMoveEditingBox()
這是 Image Picker Controller 的默認行為，您無法更改它。 唯一的其他選擇是創建自己的裁剪實用程序。 查看下面的鏈接以獲取示例：
我知道，這不是一個好的解決方案，但它確實有效。
我在iOS8+iPhone5、iOS9+iPhone6sPlus、iOS10+iPhone6、iOS10+iPhone6sPlus上進行了測試。
注意： PLImageScrollView和PLCropOverlayCropView是UNDOCUMENTED類。
- (void)showImagePickerControllerWithSourceType:(UIImagePickerControllerSourceType)sourceType {
UIImagePickerController *imagePickerController = [UIImagePickerController new];
imagePickerController.sourceType = sourceType;
imagePickerController.mediaTypes = @[(NSString *)kUTTypeImage];
imagePickerController.allowsEditing = YES;
imagePickerController.delegate = self;
[self presentViewController:imagePickerController animated:YES completion:^{
[self fxxxImagePickerController:imagePickerController];
}];
}
- (void)fxxxImagePickerController:(UIImagePickerController *)imagePickerController {
if (!imagePickerController
|| !imagePickerController.allowsEditing
|| imagePickerController.sourceType != UIImagePickerControllerSourceTypeCamera) {
return;
}
// !!!: UNDOCUMENTED CLASS
Class ScrollViewClass = NSClassFromString(@"PLImageScrollView");
Class CropViewClass = NSClassFromString(@"PLCropOverlayCropView");
[imagePickerController.view eachSubview:^BOOL(UIView *subview, NSInteger depth) {
if ([subview isKindOfClass:CropViewClass]) {
// 0. crop rect position
subview.frame = subview.superview.bounds;
}
else if ([subview isKindOfClass:[UIScrollView class]]
&& [subview isKindOfClass:ScrollViewClass]) {
BOOL isNewImageScrollView = !self->_imageScrollView;
self->_imageScrollView = (UIScrollView *)subview;
// 1. enable scrolling
CGSize size = self->_imageScrollView.frame.size;
CGFloat inset = ABS(size.width - size.height) / 2;
self->_imageScrollView.contentInset = UIEdgeInsetsMake(inset, 0, inset, 0);
// 2. centering image by default
if (isNewImageScrollView) {
CGSize contentSize = self->_imageScrollView.contentSize;
if (contentSize.height > contentSize.width) {
CGFloat offset = round((contentSize.height - contentSize.width) / 2 - inset);
self->_imageScrollView.contentOffset = CGPointMake(self->_imageScrollView.contentOffset.x, offset);
}
}
}
return YES;
}];
// prevent re-layout, maybe not necessary
@weakify(self, imagePickerController);
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
@strongify(self, imagePickerController);
[self fxxxImagePickerController:imagePickerController];
});
}
編輯： eachSubview:方法遍歷所有子視圖樹。
如果您在 info.plist 中將“查看基於控制器的狀態欄外觀”設置為 NO 並將狀態欄外觀設置為淺色，請使用
UIApplication.shared.statusBarStyle = .lightContent
或使用任何其他方法，然后只需在呈現圖像選擇器之前將樣式設置為 .default 即可。 例如：
imagePicker.allowsEditing = true
imagePicker.sourceType = .photoLibrary
UIApplication.shared.statusBarStyle = .default
present(imagePicker, animated: true, completion: nil)
根據您的需要將源類型更改為photoLibrary 或相機，並在您的didFinishPickingMediaWithInfo的完成塊中將以下內容添加到完成塊中。
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
//let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage
var pickedImage : UIImage?
if let img = info[UIImagePickerControllerEditedImage] as? UIImage
{
pickedImage = img
}
else if let img = info[UIImagePickerControllerOriginalImage] as? UIImage
{
pickedImage = img
}
dismiss(animated: true, completion: {
UIApplication.shared.statusBarStyle = .lightContent
})}
顯然這是相同的解決方法。希望這會有所幫助。
這是我最終使用的一個擴展，它在缺口和非缺口設備上都可以正常工作。 在 iOS 15 上完美運行！
extension UIImagePickerController {
open override var childForStatusBarHidden: UIViewController? {
return nil
}
open override var prefersStatusBarHidden: Bool {
return true
}
open override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
fixCannotMoveEditingBox()
}
private func fixCannotMoveEditingBox() {
if let cropView = cropView, let scrollView = scrollView, scrollView.contentOffset.y == 0 {
let top: CGFloat = cropView.frame.minY + self.view.frame.minY
let bottom = scrollView.frame.height - cropView.frame.height - top
scrollView.contentInset = UIEdgeInsets(top: top, left: 0, bottom: bottom, right: 0)
var offset: CGFloat = 0
if scrollView.contentSize.height > scrollView.contentSize.width {
offset = 0.5 * (scrollView.contentSize.height - scrollView.contentSize.width)
}
scrollView.contentOffset = CGPoint(x: 0, y: -top + offset)
}
DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) { [weak self] in
self?.fixCannotMoveEditingBox()
}
}
private var cropView: UIView? {
return findCropView(from: self.view)
}
private var scrollView: UIScrollView? {
return findScrollView(from: self.view)
}
private func findCropView(from view: UIView) -> UIView? {
let width = UIScreen.main.bounds.width
let size = view.bounds.size
if width == size.height, width == size.height {
return view
}
for view in view.subviews {
if let cropView = findCropView(from: view) {
return cropView
}
}
return nil
}
private func findScrollView(from view: UIView) -> UIScrollView? {
if let scrollView = view as? UIScrollView {
return scrollView
}
for view in view.subviews {
if let scrollView = findScrollView(from: view) {
return scrollView
}
}
return nil
}
}
ps：與其他類似答案的唯一變化是：
解決它的一種解決方法是在 info.plist 中添加一個條目，並將“基於控制器的狀態欄外觀”設置為 NO
如果UIImagePickerControllerSourceTypePhotoLibrary允許編輯NO
[英]if UIImagePickerControllerSourceTypePhotoLibrary allowsediting NO
UIImagePickerController allowEditing = YES不起作用
[英]UIImagePickerController allowsEditing = YES not working
即使allowsEditing為true，EditingInfo中也沒有UIImagePickerControllerEditedImage
[英]There is no UIImagePickerControllerEditedImage in editingInfo even when allowsEditing is true
使用'UIImagePickerController'和'allowEditing'處理以獲得完美的正方形
[英]Handle with 'UIImagePickerController' and 'allowsEditing' to get perfect square
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