我有一个用于录制视频的UIImagePickerController。现在我想检测用户点击记录按钮的时间。代表不提供任何此类回调。
有没有什么好方法可以找出录制视频的时间？
答案 0 :(得分：6)
你是对的：代表没有收到有关何时发生视频捕获的任何信息。简单的解决方案是简单地滚动您自己的相机控件 - 将showsCameraControls属性设置为NO并在具有cameraOverlayView属性的自定义视图中提供您自己的控件 - 并让您“捕获”按钮调用图像选取器控制器的-startVideoCapture和-stopVideoCapture方法，同时向应用程序的其他部分提供所需的任何通知。
答案 1 :(得分：2)
在一个完美的世界中，你希望Apple只提供几个能够做到这一点的代表。例如：
然而现实（根据苹果文档）是：
文档还指出：“您可以为cameraOverlayView属性分配自定义视图，并使用该视图显示其他信息或管理相机界面与代码之间的交互”。
在我的应用程序中，我需要提供“UIProgressView”来指示视频可以记录多长时间。为了实现这一点，我需要能够检测视频捕获开始的那一刻。
我不想禁用原生相机控制，因为它们很酷而且我很懒，所以我不想花很多时间重新发明轮子。我所需要的只是捕捉到一个巨大的红色按钮被点击以开始或停止录制的事实。
我的解决方案是使用自定义视图“覆盖”原始的“开始/停止”录制按钮，并启用该视图的用户互动，如下所示：
overlayView = [[UIView alloc] initWithFrame:self.view.frame];
// Start/ Stop fake button
UIView *ssView = [[UIView alloc] initWithFrame:CGRectMake(self.view.frame.size.width / 2 - 35, self.view.frame.size.height - 71, 70, 70)];
[ssView setUserInteractionEnabled:YES];
// Background color below is only there to make sure my pseudo-button overlaps native Start/Stop button. Comment out the line below to leave it transparent
[ssView setBackgroundColor:[UIColor colorWithRed:0 green:1 blue:0 alpha:0.5f]];
UITapGestureRecognizer *t = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)];
[ssView addGestureRecognizer:t];
[overlayView addSubview:ssView];
// My own progress bar
UIProgressView *p = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
[p setTintColor:[UIColor redColor]];
[p setCenter:CGPointMake(30, 130)];
[p setTransform:CGAffineTransformMakeRotation( M_PI / 2 )];
[p setProgress:0];
[overlayView addSubview:p];
pickerController.cameraOverlayView = overlayView;
然后，我按照以下步骤定义了一个tap的事件处理程序：
-(void)tapped:(id)sender {
if (isRecording) {
[pickerController stopVideoCapture];
NSLog(@"Video capturing stopped...");
// add your business logic here ie stop updating progress bar etc...
[pickerController.cameraOverlayView setHidden:YES];
isRecording = NO;
return;
}
if ([pickerController startVideoCapture]) {
NSLog(@"Video capturing started...");
// add your business logic here ie start updating progress bar etc...
isRecording = YES;
}
}
接口文件的完整代码：
#import <UIKit/UIKit.h>
#import <MobileCoreServices/MobileCoreServices.h>
@interface ViewController : UIViewController <UIImagePickerControllerDelegate>
- (IBAction)openCamera:(id)sender;
@end
实施档案：
#import "ViewController.h"
@interface ViewController () {
UIImagePickerController *pickerController;
UIView* overlayView;
BOOL isRecording;
}
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
isRecording = NO;
pickerController = [[UIImagePickerController alloc] init];
pickerController.delegate = self;
pickerController.allowsEditing = NO;
pickerController.videoMaximumDuration = 30.0f;
pickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
pickerController.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil];
// I want default controls be available here...
pickerController.showsCameraControls = YES;
overlayView = [[UIView alloc] initWithFrame:self.view.frame];
// Start/ Stop fake button
UIView *ssView = [[UIView alloc] initWithFrame:CGRectMake(self.view.frame.size.width / 2 - 35, self.view.frame.size.height - 71, 70, 70)];
[ssView setUserInteractionEnabled:YES];
// Background color below is only there to make sure myt pseudo-button overlaps native Start/Stop button
[ssView setBackgroundColor:[UIColor colorWithRed:0 green:1 blue:0 alpha:0.5f]];
UITapGestureRecognizer *t = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)];
[ssView addGestureRecognizer:t];
[overlayView addSubview:ssView];
// My own progress bar
UIProgressView *p = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
[p setTintColor:[UIColor redColor]];
[p setCenter:CGPointMake(30, 130)];
[p setTransform:CGAffineTransformMakeRotation( M_PI / 2 )];
[p setProgress:0];
[overlayView addSubview:p];
pickerController.cameraOverlayView = overlayView;
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
// Cancel button tapped
[picker dismissViewControllerAnimated:YES completion:nil];
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
NSLog(@"Got image : %@", info);
[picker dismissViewControllerAnimated:YES completion:nil];
// Do something with video captured
}
-(void)tapped:(id)sender {
if (isRecording) {
[pickerController stopVideoCapture];
NSLog(@"Video capturing stopped...");
// add your business logic here ie stop updating progress bar etc...
[pickerController.cameraOverlayView setHidden:YES];
isRecording = NO;
return;
}
if ([pickerController startVideoCapture]) {
NSLog(@"Video capturing started...");
// add your business logic here ie start updating progress bar etc...
isRecording = YES;
}
}
- (IBAction)openCamera:(id)sender {
[pickerController.cameraOverlayView setHidden:NO];
[self presentViewController:pickerController animated:YES completion:nil];
}
@end
您可能已经注意到，一旦视频捕获停止，我就会隐藏cameraOverlayView。
[pickerController.cameraOverlayView setHidden:YES];
这是为了让“重拍/播放和使用”原生控件在录制视频后正常工作。
答案 2 :(得分：0)
根据ios api，方法“startVideoCapture”给出一个布尔返回值
是表示正在录制
否表示以下其中一项：
[参考：http：//developer.apple.com/library/ios/#documentation/uikit/reference/UIImagePickerController_Class/UIImagePickerController/UIImagePickerController.html]
所以只要'startRecording'返回是，你几乎肯定会说它正在录音。当然，为了检查这一点，你总是可以用NSTimer手动定义你自己的回调（虽然之前有一个关于其准确性的热议辩论。）
答案 3 :(得分：0)
这是一个快速的3 UIImagePickerController类，只允许用户在摄像机处于横向状态时捕获视频。
创建UIImagePickerController时：
var imagePicker = CameraVideo_ViewController()
您还需要在委托中使用此功能：
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
self.imagePicker.isInFinalScreen = false
}
这是班级。我没有时间整理它，它真的很乱......我通过尽我所能创建这个类而不删除默认控件。使用了一堆黑客，所以在删除变量时要非常小心，因为大多数它们都很重要，即使它们看起来没用。我会尝试重新发布一个更干净的版本，当我能找到一些时间，但在那之前，如果有人可以重新发布一个更干净，更新手友好的版本我/我们将不胜感激。
import UIKit
import AVFoundation;
class CameraVideo_ViewController: UIImagePickerController {
var viewMain:UIView!
var lastOrientationWasLandscape:UIDeviceOrientation?
var isForLibrary:Bool! = false
var parentController:UIViewController!
override func viewDidAppear(_ animated: Bool) {
if isForLibrary == true {
return
}
let orientation = UIDevice.current.orientation
if orientation == .landscapeLeft || orientation == .landscapeRight {
lastOrientationWasLandscape = orientation
}
if (self.isInFinalScreen == true){
self.recordBut.frame = CGRect(x: self.view.frame.size.width - 70 - 16, y: self.view.frame.size.height / 2 - 35, width: 70, height: 70)
self.isInFinalScreen = false
}
recordBut.alpha = 1
recordBut.isUserInteractionEnabled = true
retakeBut.alpha = 1
retakeBut.isUserInteractionEnabled = true
UIDevice.current.beginGeneratingDeviceOrientationNotifications()
NotificationCenter.default.addObserver(self, selector: #selector(orientationChanged(_:)), name: NSNotification.Name.UIDeviceOrientationDidChange, object: nil)
let notif = Notification.init(name: NSNotification.Name.UIDeviceOrientationDidChange)
orientationChanged(notif)
}
override func viewWillDisappear(_ animated: Bool) {
viewMain.alpha = 0
viewMain.isUserInteractionEnabled = false
lastOrientationWasLandscape = nil
recordBut.alpha = 0
recordBut.isUserInteractionEnabled = false
retakeBut.alpha = 0
retakeBut.isUserInteractionEnabled = false
self.viewMain.alpha = 0
self.viewMain.isUserInteractionEnabled = false
isInFinalScreenBool = false
recordedThisSession = false
if isForLibrary == true {
return
}
print("hidingCameraView")
NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIDeviceOrientationDidChange, object: nil)
UIDevice.current.endGeneratingDeviceOrientationNotifications()
}
override func viewDidLoad() {
super.viewDidLoad()
if isForLibrary == true {
return
}
viewMain = UIView()
viewMain.frame = CGRect(x: view.frame.minX, y: view.frame.minY, width: view.frame.width, height: view.frame.height)
viewMain.backgroundColor = UIColor.clear
let viewBg = UIView()
viewBg.frame = CGRect(x: view.frame.minX, y: view.frame.minY, width: view.frame.width, height: view.frame.height)
viewBg.backgroundColor = UIColor.black
viewBg.alpha = 0.5
let viewAlertBg = UIView()
viewAlertBg.frame = CGRect(x: view.frame.width/2 - 250/2, y: view.frame.height/2 - 100/2 - 25, width: 250, height: 100)
viewAlertBg.backgroundColor = UIColor.white
viewAlertBg.alpha = 1
viewAlertBg.clipsToBounds = true;
var path = UIBezierPath(roundedRect:viewAlertBg.bounds,
byRoundingCorners:[.topLeft, .topRight],
cornerRadii: CGSize(width: 25, height: 25))
var maskLayer = CAShapeLayer()
maskLayer.path = path.cgPath
viewAlertBg.layer.mask = maskLayer
let viewAlertBgUnderline = UIView()
viewAlertBgUnderline.frame = CGRect(x: view.frame.width/2 - 250/2, y: viewAlertBg.frame.maxY, width: 250, height: 1)
viewAlertBgUnderline.backgroundColor = UIColor.lightGray
viewAlertBgUnderline.alpha = 1
viewAlertBgUnderline.clipsToBounds = true;
let viewAlertCancelBut = UIButton()
viewAlertCancelBut.frame = CGRect(x: view.frame.width/2 - 250/2, y: viewAlertBgUnderline.frame.maxY, width: 250, height: 50)
viewAlertCancelBut.backgroundColor = UIColor.white
viewAlertCancelBut.setTitle("Back", for: .normal)
viewAlertCancelBut.setTitleColor(UIColor.blue, for: .normal)
path = UIBezierPath(roundedRect:viewAlertCancelBut.bounds,
byRoundingCorners:[.bottomLeft, .bottomRight],
cornerRadii: CGSize(width: 25, height: 25))
maskLayer = CAShapeLayer()
maskLayer.path = path.cgPath
viewAlertCancelBut.layer.mask = maskLayer
viewAlertCancelBut.addTarget(self, action: #selector(onBack(_:)), for: .touchUpInside)
let alertLabel = UILabel()
alertLabel.numberOfLines = 4
alertLabel.frame = CGRect(x: 16, y: 16, width: 250 - 32, height: 100 - 32)
alertLabel.textAlignment = NSTextAlignment.center
alertLabel.adjustsFontSizeToFitWidth = true
alertLabel.font = UIFont.systemFont(ofSize: 12)
alertLabel.backgroundColor = UIColor.clear
alertLabel.textColor = UIColor.black
let boldText = "The video must be recorded in landscape mode.\n"
let normalText = "Please hold your device in a horizontal position!"
let attrs = [NSFontAttributeName : UIFont.boldSystemFont(ofSize: 13)]
let boldString = NSMutableAttributedString(string:boldText, attributes:attrs)
let attributedString = NSMutableAttributedString(string:"")
attributedString.append(boldString)
attributedString.append(NSMutableAttributedString(string:normalText, attributes:nil))
alertLabel.attributedText = attributedString
viewAlertBg.addSubview(alertLabel)
viewMain.addSubview(viewBg)
viewMain.addSubview(viewAlertCancelBut)
viewMain.addSubview(viewAlertBg)
viewMain.addSubview(viewAlertBgUnderline)
viewMain.alpha = 0
viewMain.isUserInteractionEnabled = false
// Start/ Stop fake button
recordBut = UIButton()
if (UIDevice.current.userInterfaceIdiom == .phone){
recordBut.frame = CGRect(x: self.view.frame.size.width / 2 - 35, y: self.view.frame.size.height - 70 - 2, width: 70, height: 70)
}else{
recordBut.frame = CGRect(x: self.view.frame.size.height - 70 - 16, y: self.view.frame.size.width/2 - 35, width: 70, height: 70)
}
recordBut.setTitle("", for: .normal)
recordBut.setTitleColor(UIColor.blue, for: .normal)
recordBut.isUserInteractionEnabled = true
recordBut.backgroundColor = UIColor(red: 0, green: 1, blue: 0, alpha: 0.5)
recordBut.addTarget(self, action: #selector(tapped(_:)), for: .touchUpInside)
self.view.addSubview(recordBut)
retakeBut = UIButton()
if (UIDevice.current.userInterfaceIdiom == .phone){
retakeBut.frame = CGRect(x: 0, y: self.view.frame.size.height - 70, width: 80, height: 70)
}else{
retakeBut.frame = CGRect(x: 0, y: self.view.frame.size.width - 70, width: 80, height: 70)
}
retakeBut.setTitle("", for: .normal)
retakeBut.setTitleColor(UIColor.blue, for: .normal)
retakeBut.isUserInteractionEnabled = true
retakeBut.backgroundColor = UIColor(red: 0, green: 1, blue: 0, alpha: 0.5)
retakeBut.addTarget(self, action: #selector(retake(_:)), for: .touchUpInside)
self.view.addSubview(retakeBut)
self.view.addSubview(viewMain)
}
override func viewDidLayoutSubviews() {
if isForLibrary == true {
return
}
self.adjustViews(for: UIDevice.current.orientation)
}
var t:UITapGestureRecognizer!
var recordBut:UIButton!
var retakeBut:UIButton!
var isInFinalScreen:Bool = false
var isRecording:Bool = false
var isInFinalScreenBool:Bool = false
var recordedThisSession:Bool = false
func tapped(_ sender:UIButton){
if (isRecording == false && self.startVideoCapture()){
recordedThisSession = true
isRecording = true
retakeBut.alpha = 0
retakeBut.isUserInteractionEnabled = false
}else{
retakeBut.alpha = 1
retakeBut.isUserInteractionEnabled = true
recordBut.alpha = 0
recordBut.isUserInteractionEnabled = false
self.stopVideoCapture()
isRecording = false
if (UIDevice.current.orientation != .portrait){
self.adjustViews(for: UIDevice.current.orientation)
}
isInFinalScreen = true
return
}
}
func retake(_ sender:UIButton){
if (recordedThisSession == false){
onBack(sender)
}
self.dismiss(animated: true, completion: {
self.parentController.present((self.parentController as! AddVideo_ViewController).imagePicker, animated: true, completion: {
})
})
}
func onBack(_ sender:UIButton){
self.isInFinalScreen = false
self.dismiss(animated: true, completion: {
})
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func orientationChanged(_ notification: Notification) {
self.adjustViews(for: UIDevice.current.orientation)
}
func adjustViews(for orient: UIDeviceOrientation) {
var orientation = orient
if (orientation.isLandscape == true) || (orientation.isFlat && lastOrientationWasLandscape?.isPortrait == false) {
print(".....landscape.....")
if (UIDevice.current.userInterfaceIdiom == .pad){
self.recordBut.frame = CGRect(x: self.view.frame.size.width - 70 - 16, y: self.view.frame.size.height/2 - 35, width: 70, height: 70)
self.retakeBut.frame = CGRect(x: 0, y: self.view.frame.size.height - 70, width: 80, height: 70)
}else{
recordBut.frame = CGRect(x: self.view.frame.size.width / 2 - 35, y: self.view.frame.size.height - 70 - 2, width: 70, height: 70)
retakeBut.frame = CGRect(x: 0, y: self.view.frame.size.height - 70, width: 80, height: 70)
}
if (recordedThisSession == false){
if (UIDevice.current.userInterfaceIdiom == .pad){
self.retakeBut.frame = CGRect(x: self.view.frame.size.width - 100, y: self.view.frame.size.height - 70, width: 100, height: 70)
}else{
retakeBut.frame = CGRect(x: 0, y: self.view.frame.size.height - 70, width: 80, height: 70)
}
}
if (self.isInFinalScreenBool == true){
return
}
if (self.isInFinalScreen == true){
self.isInFinalScreenBool = !isInFinalScreenBool
self.isInFinalScreen = false
return
}
if (self.isRecording){
return
}
self.viewMain.alpha = 0
self.viewMain.isUserInteractionEnabled = false
self.lastOrientationWasLandscape = orientation
}
else {
print(".....portrait.....")
self.lastOrientationWasLandscape = UIDeviceOrientation(rawValue: UIDeviceOrientation.portrait.rawValue)
if (UIDevice.current.userInterfaceIdiom == .pad){
self.recordBut.frame = CGRect(x: self.view.frame.size.width - 70 - 16, y: self.view.frame.size.height / 2 - 35, width: 70, height: 70)
self.retakeBut.frame = CGRect(x: 0, y: self.view.frame.size.height - 70, width: 80, height: 70)
}else{
recordBut.frame = CGRect(x: self.view.frame.size.width / 2 - 35, y: self.view.frame.size.height - 70 - 2, width: 70, height: 70)
retakeBut.frame = CGRect(x: 0, y: self.view.frame.size.height - 70, width: 80, height: 70)
}
if (recordedThisSession == false){
if (UIDevice.current.userInterfaceIdiom == .pad){
self.retakeBut.frame = CGRect(x: self.view.frame.size.width - 100, y: self.view.frame.size.height - 70, width: 100, height: 70)
}else{
retakeBut.frame = CGRect(x: 0, y: self.view.frame.size.height - 70, width: 80, height: 70)
}
}
if (self.isInFinalScreenBool == true){
return
}
if (self.isInFinalScreen){
return
}
if (self.isRecording){
return
}
self.viewMain.alpha = 1
self.viewMain.isUserInteractionEnabled = true
}
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
祝你好运！