[英]How to select image from photo library and show the system camera interface within the app?
How can I let a user select a photo from the Apple Photos library? 如何让用户从Apple照片库中选择照片? How do we show the system camera UI to allow the user to take a picture? 我们如何显示系统相机用户界面以允许用户拍照?
EDIT: March 15, 2016 - Here is a swift version of my prior answer, if you're looking for the objective-c version you'll find it below. 编辑:2016年3月15日-这是我先前的答案的快速版本,如果您正在寻找的objective-c版本,您将在下面找到它。
-- SWIFT -- -SWIFT-
First conform to the UIImagePickerControllerDelegate protocol and the UINavigationControllerDelegate protocol 首先符合UIImagePickerControllerDelegate协议和UINavigationControllerDelegate协议
class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate
launch the image picker 启动图像选择器
func actionLaunchCamera()
{
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera)
{
let imagePicker:UIImagePickerController = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = UIImagePickerControllerSourceType.Camera
imagePicker.allowsEditing = true
self.presentViewController(imagePicker, animated: true, completion: nil)
}
else
{
let alert:UIAlertController = UIAlertController(title: "Camera Unavailable", message: "Unable to find a camera on this device", preferredStyle: UIAlertControllerStyle.Alert)
self.presentViewController(alert, animated: true, completion: nil)
}
}
implement the delegate methods for UIImagePickerDelegate protocol 实现UIImagePickerDelegate协议的委托方法
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject])
{
// create a filepath with the current date/time as the image name
let savePath:String = self.documentsPath()! + "/" + self.presentDateTimeString() + ".png"
// try to get our edited image if there is one, as well as the original image
let editedImg:UIImage? = info[UIImagePickerControllerEditedImage] as? UIImage
let originalImg:UIImage? = info[UIImagePickerControllerOriginalImage] as? UIImage
// create our image data with the edited img if we have one, else use the original image
let imgData:NSData = editedImg == nil ? UIImagePNGRepresentation(editedImg!)! : UIImagePNGRepresentation(originalImg!)!
// write the image data to file
imgData.writeToFile(savePath, atomically: true)
// dismiss the picker
self.dismissViewControllerAnimated(true, completion: nil)
}
func imagePickerControllerDidCancel(picker: UIImagePickerController)
{
// picker cancelled, dismiss picker view controller
self.dismissViewControllerAnimated(true, completion: nil)
}
// added these methods simply for convenience/completeness
func documentsPath() ->String?
{
// fetch our paths
let paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
if paths.count > 0
{
// return our docs directory path if we have one
let docsDir = paths[0]
return docsDir
}
return nil
}
func presentDateTimeString() ->String
{
// setup date formatter
let dateFormatter:NSDateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "dd-MM-yyyy HH:mm:ss"
// get current date
let now:NSDate = NSDate()
// generate date string from now
let theDateTime = dateFormatter.stringFromDate(now)
return theDateTime
}
-- OBJECTIVE-C -- -目标-C-
EDIT: Updated to check if camera is available before trying to launch it. 编辑:更新以在尝试启动相机之前检查相机是否可用。 Also added code showing how to save a png photo to the documents folder within the app sandbox. 还添加了代码,显示了如何将png照片保存到应用程序沙箱中的documents文件夹中。
Give this a try (this assumes using ARC). 试试看(假设使用ARC)。
In the .h file conform to the delegate protocol: 在.h文件中,遵循委托协议:
@interface MyViewController : UIViewController <UINavigationControllerDelegate,UIImagePickerControllerDelegate>
In the .m file launch the image picker (camera): 在.m文件中,启动图像选择器(相机):
-(void)actionLaunchAppCamera
{
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
UIImagePickerController *imagePicker = [[UIImagePickerController alloc]init];
imagePicker.delegate = self;
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
imagePicker.allowsEditing = YES;
[self presentModalViewController:imagePicker animated:YES];
}else{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Camera Unavailable"
message:@"Unable to find a camera on your device."
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil, nil];
[alert show];
alert = nil;
}
}
Then implement the delegate protocols to handle a user cancel event or save/edit/etc the photo. 然后实施委托协议来处理用户取消事件或保存/编辑/等照片。
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
//This creates a filepath with the current date/time as the name to save the image
NSString *presentTimeStamp = [Utilities getPresentDateTime];
NSString *fileSavePath = [Utilities documentsPath:presentTimeStamp];
fileSavePath = [fileSavePath stringByAppendingString:@".png"];
//This checks to see if the image was edited, if it was it saves the edited version as a .png
if ([info objectForKey:UIImagePickerControllerEditedImage]) {
//save the edited image
NSData *imgPngData = UIImagePNGRepresentation([info objectForKey:UIImagePickerControllerEditedImage]);
[imgPngData writeToFile:fileSavePath atomically:YES];
}else{
//save the original image
NSData *imgPngData = UIImagePNGRepresentation([info objectForKey:UIImagePickerControllerOriginalImage]);
[imgPngData writeToFile:fileSavePath atomically:YES];
}
[self dismissModalViewControllerAnimated:YES];
}
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
[self dismissModalViewControllerAnimated:YES];
}
ALSO ADDED IN EDIT: Here are the methods referenced it the Utilities class for getting the document path and current date/time 还添加了编辑:这是Utilities类引用的方法,用于获取文档路径和当前日期/时间
+(NSString *)documentsPath:(NSString *)fileName {
NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
return [documentsDirectory stringByAppendingPathComponent:fileName];
}
+(NSString *)getPresentDateTime{
NSDateFormatter *dateTimeFormat = [[NSDateFormatter alloc] init];
[dateTimeFormat setDateFormat:@"dd-MM-yyyy HH:mm:ss"];
NSDate *now = [[NSDate alloc] init];
NSString *theDateTime = [dateTimeFormat stringFromDate:now];
dateTimeFormat = nil;
now = nil;
return theDateTime;
}
You need to use UIImagePickerController . 您需要使用UIImagePickerController 。
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
You have to implement the UIImagePickerControllerDelegate
method imagePickerController:didFinishPickingMediaWithInfo:
and then store the UIImage to wherever you want, with whatever file name you want, using NSFileManager methods. 您必须实现UIImagePickerControllerDelegate
方法imagePickerController:didFinishPickingMediaWithInfo:
,然后使用NSFileManager方法将UIImage以所需的任何文件名存储到所需的任何位置。
Here's an updated version of digitalHound's answer which works for Swift 3. 这是适用于Swift 3的digitalHound答案的更新版本。
Action Launch Camera function: 动作启动摄像头功能:
func actionLaunchCamera()
{
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.camera)
{
let imagePicker:UIImagePickerController = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = UIImagePickerControllerSourceType.camera
imagePicker.allowsEditing = true
self.present(imagePicker, animated: true, completion: nil)
}
else
{
let alert:UIAlertController = UIAlertController(title: "Camera Unavailable", message: "Unable to find a camera on this device", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Dismiss", style: .default, handler: nil))
alert.view.tintColor = UIColor(red:0.37, green:0.66, blue:0.44, alpha:1.0)
self.present(alert, animated: true, completion: nil)
}
}
The Delegate Functions: 代表职能:
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
// create a filepath with the current date/time as the image name
let savePath:URL = URL(fileURLWithPath: self.documentsPath()! + "/" + self.presentDateTimeString() + ".png")
// try to get our edited image if there is one, as well as the original image
let editedImg:UIImage? = info[UIImagePickerControllerEditedImage] as? UIImage
let originalImg:UIImage? = info[UIImagePickerControllerOriginalImage] as? UIImage
// create our image data with the edited img if we have one, else use the original image
let imgData:Data = editedImg == nil ? UIImagePNGRepresentation(editedImg!)! : UIImagePNGRepresentation(originalImg!)! as Data
// write the image data to file
try! imgData.write(to: savePath, options: [])
// dismiss the picker
self.dismiss(animated: true, completion: nil)
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
// picker cancelled, dismiss picker view controller
self.dismiss(animated: true, completion: nil)
}
// added these methods simply for convenience/completeness
func documentsPath() ->String?
{
// fetch our paths
let paths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)
if paths.count > 0
{
// return our docs directory path if we have one
let docsDir = paths[0]
return docsDir
}
return nil
}
func presentDateTimeString() ->String
{
// setup date formatter
let dateFormatter:DateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd-MM-yyyy HH:mm:ss"
// get current date
let now:Date = Date()
// generate date string from now
let theDateTime = dateFormatter.string(from: now)
return theDateTime
}
This is what worked for me. 这对我有用。
Step 1 : Confirm to UIImagePickerControllerDelegate ,UINavigationControllerDelegate 步骤1:确认到UIImagePickerControllerDelegate,UINavigationControllerDelegate
Step 2: (iOS 10+) Add this as key to your info.plist file Key : Privacy - Camera Usage Description 步骤2:(iOS 10+)将此作为密钥添加到您的info.plist文件中密钥:隐私-相机使用说明
value: #Your message 值:#您的留言
Step 3: and this in your @IBAction 步骤3:这在您的@IBAction中
if UIImagePickerController.isSourceTypeAvailable(.camera) {
var imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = .camera
imagePicker.allowsEditing = false
self.present(imagePicker, animated: true, completion: nil)
}
//For Open Gallery //对于开放画廊
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
imagePickerController.delegate = self;
if([[[UIDevice currentDevice] systemVersion] floatValue]>=8.0)
{
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self presentViewController:imagePickerController animated:YES completion:nil];
}];
}
else{
[self presentViewController:imagePickerController animated:YES completion:nil];
}
// For Open Camera //对于开放式相机
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.modalPresentationStyle = UIModalPresentationFullScreen;
imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
imagePickerController.delegate = self;
if([[[UIDevice currentDevice] systemVersion] floatValue]>=8.0)
{
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self presentViewController:imagePickerController animated:YES completion:nil];
}];
}
else{
[self presentViewController:imagePickerController animated:YES completion:nil];
}
}
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
此代码将触发设备摄像头。
I created this library for those you need to integrate this functionality immediately. 我为那些需要立即集成此功能的人创建了该库 。 You can also apply filters to your image with a single line of code all you have to write is :- 您还可以使用一行代码将滤镜应用于图像,您只需编写以下代码:
let picker = PickerController()
picker.applyFilter = true // to apply filter after selecting the picture by default false
picker.selectImage(self){ image in
// Use the picture
}
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