打开相机在iphone应用程序 [英] opening camera in iphone app programatically
本文介绍了打开相机在iphone应用程序的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
如何在iphone应用程序中打开相机...喜欢使用imagepickerview我们可以打开图书馆...如何打开相机应用程序，以便我们可以拍照..
解决方案
编辑：2016年3月15日 - 这是一个快速版本的我的前一个答案，如果你正在寻找的目标c版本，你会发现它下面。 >
- SWIFT -
首先符合UIImagePickerControllerDelegate协议和UINavigationControllerDelegate协议
class ViewController：UIViewController，UIImagePickerControllerDelegate，UINavigationControllerDelegate
启动图片选择器
func actionLaunchCamera（）
{
如果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相机不可用，消息：无法在此设备上找到相机，preferredStyle：UIAlertControllerStyle.Alert）
self.presentViewController（alert，animated：true，completion：nil）
}
}
实现UIImagePickerDelegate协议的委托方法
func imagePickerController（picker：UIImagePickerController，didFinishPickingMediaWithInfo info：[String：AnyObject]）
{
//创建一个以当前日期/时间作为图像的文件路径name
let savePath：String = self.documentsPath（）！ +/+ self.presentDateTimeString（）+.png
//如果有图像，尝试获取我们编辑的图像，以及原始图像
let editedImg：UIImage ？ = info [UIImagePickerControllerEditedImage] as？ UIImage
let originalImg：UIImage？ = info [UIImagePickerControllerOriginalImage] as？ UIImage
//如果我们有一个编辑的img创建我们的图像数据，否则使用原始图像
let imgData：NSData = editedImg == nil？ UIImagePNGRepresentation（editedImg！）！ ：UIImagePNGRepresentation（originalImg！）！
//将图像数据写入文件
imgData.writeToFile（savePath，atomically：true）
//关闭选择器
self.dismissViewControllerAnimated （true，completion：nil）
}
func imagePickerControllerDidCancel（picker：UIImagePickerController）
{
//取消选择器取消选择器视图控制器
self .dismissViewControllerAnimated（true，completion：nil）
}
为方便/完整添加这些方法
func documentsPath（） - > String？
{
//获取我们的路径
let paths = NSSearchPathForDirectoriesInDomains（NSSearchPathDirectory.DocumentDirectory，NSSearchPathDomainMask.UserDomainMask，true）
如果paths.count> 0
{
//如果我们有一个返回我们的docs目录路径
let docsDir = paths [0]
return docsDir
}
return nil
}
func presentDateTimeString（） - > String
{
//设置日期格式化程序
let dateFormatter：NSDateFormatter = NSDateFormatter dateFormatter.dateFormat =dd-MM-yyyy HH：mm：ss
//获取当前日期
现在：NSDate = NSDate（）
/ /从现在起生成日期字符串
let theDateTime = dateFormatter.stringFromDate（now）
return theDateTime
}
- OBJECTIVE-C -
编辑：更新以检查相机是否可用，
尝试一下（假设使用ARC）。
在符合委托协议的.h文件中：
@interface MyViewController：UIViewController < UINavigationControllerDelegate，UIImagePickerControllerDelegate>
在.m文件中启动图像选择器（摄像机）：
- （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：@无法在设备上找到相机。
delegate：nil
cancelButtonTitle：@OK
otherButtonTitles：nil，nil];
[alert show];
alert = nil;
}
}
然后实现委托协议来处理用户取消事件
- （void）imagePickerController：（UIImagePickerController *）picker didFinishPickingMediaWithInfo：（NSDictionary *） info
{
//这将创建一个文件路径，使用当前日期/时间作为保存图像的名称
NSString * presentTimeStamp = [Utilities getPresentDateTime];
NSString * fileSavePath = [Utilities documentsPath：presentTimeStamp];
fileSavePath = [fileSavePath stringByAppendingString：@。png];
//检查图像是否被编辑，如果它将编辑的版本保存为.png
if（[info objectForKey：UIImagePickerControllerEditedImage]）{
//保存编辑后的图像
NSData * imgPngData = UIImagePNGRepresentation（[info objectForKey：UIImagePickerControllerEditedImage]）;
[imgPngData writeToFile：fileSavePath atomically：YES];
} else {
//保存原始图像
NSData * imgPngData = UIImagePNGRepresentation（[info objectForKey：UIImagePickerControllerOriginalImage]）;
[imgPngData writeToFile：fileSavePath atomically：YES];
}
[self dismissModalViewControllerAnimated：YES];
}
- （void）imagePickerControllerDidCancel：（UIImagePickerController *）picker
{
[self dismissModalViewControllerAnimated：YES];
}
另外添加在编辑：
这里是引用它的方法用于获取文档路径和当前日期/时间的实用程序类
+（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;
}
How to open camera in iphone app...Like using imagepickerview we can open the library..how to open the camera app so that we can take picture..
解决方案
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.
-- SWIFT --
First conform to the UIImagePickerControllerDelegate protocol and the UINavigationControllerDelegate protocol
class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate
launch the image picker
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
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 --
EDIT: Updated to check if camera is available before trying to launch it. Also added code showing how to save a png photo to the documents folder within the app sandbox.
Give this a try (this assumes using ARC).
In the .h file conform to the delegate protocol:
@interface MyViewController : UIViewController <UINavigationControllerDelegate,UIImagePickerControllerDelegate>
In the .m file launch the image picker (camera):
-(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.
-(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
+(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;
}
这篇关于打开相机在iphone应用程序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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