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iOS拍照与摄像代码详解

xmjava 2018年06月24日 手机开发 598 0
该类继承自UINavigationController类
步骤:
检查媒体来源模式是否可用
检查该来源模式下所支持的媒体类型
创建图像选取控制器,设置其属性并显示
在委托协议方法中处理

1.检查媒体来源
调用UIImagePickerController类的静态方法isSourceTypeAvailable来检查
sourceType是一个UIImagePickerControllerSourceType类型的枚举值,它表示图像选取控制器的3种不同的媒体来源模式
UIImagePickerControllerSourceTypePhotoLibrary:照片库模式。图像选取控制器以该模式显示时会浏览系统照片库的根目录。
UIImagePickerControllerSourceTypeCamera:相机模式,图像选取控制器以该模式显示时可以进行拍照或摄像。
UIImagePickerControllerSourceTypeSavedPhotosAlbum:相机胶卷模式,图像选取控制器以该模式显示时会浏览相机胶卷目录。
如果设备支持指定的媒体来源模式,则isSourceTypeAvailable:方法返回YES,否则返回NO。
2.检查支持的媒体类型
调用UIImagePickerController类的另一个静态方法 availableMediaTypesForSourceType:
返回的是字符串数组,kUTTypeImage表示静态图片,kUTTypeMovie表示视频。这两个字符串常量定义在MobileCoreServices框架中。
在.h文件需要导入

#import <MobileCoreServices/UTCoreTypes.h>

参数info是一个字典,包含媒体类型,拍照的原始图片,编辑后的图片,或是摄像的视频文件的URL等。

//

//  ViewController.h

//  Camera

//

//  Created by gao wuhang on 12-11-23.

//  Copyright (c) 2012年 gao wuhang. All rights reserved.

//


#import


@interface ViewController : UIViewController<UINavigationControllerDelegate,UIImagePickerControllerDelegate>


- (IBAction)takePictureButtonClick:(id)sender;

- (IBAction)captureVideoButtonClick:(id)sender;


@end

//

//  ViewController.m

//  Camera

//

//  Created by gao wuhang on 12-11-23.

//  Copyright (c) 2012年 gao wuhang. All rights reserved.

//


#import "ViewController.h"

#import

#import


@interface ViewController ()


@end


@implementation ViewController



- (IBAction)takePictureButtonClick:(id)sender{

    //检查相机模式是否可用

    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

        NSLog(@"sorry, no camera or camera is unavailable.");

        return;

    }

    //获得相机模式下支持的媒体类型

    NSArray* availableMediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];

    BOOL canTakePicture = NO;

    for (NSString* mediaType in availableMediaTypes) {

        if ([mediaType isEqualToString:(NSString*)kUTTypeImage]) {

            //支持拍照

            canTakePicture = YES;

            break;

        }

    }

    //检查是否支持拍照

    if (!canTakePicture) {

        NSLog(@"sorry, taking picture is not supported.");

        return;

    }

    //创建图像选取控制器

    UIImagePickerController* imagePickerController = [[UIImagePickerController alloc] init];

    //设置图像选取控制器的来源模式为相机模式

    imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;

    //设置图像选取控制器的类型为静态图像

    imagePickerController.mediaTypes = [[[NSArray alloc] initWithObjects:(NSString*)kUTTypeImage, nil]autorelease];

    //允许用户进行编辑

    imagePickerController.allowsEditing = YES;

    //设置委托对象

    imagePickerController.delegate = self;

    //以模视图控制器的形式显示

    [self presentModalViewController:imagePickerController animated:YES];

    [imagePickerController release];

}


- (IBAction)captureVideoButtonClick:(id)sender{

    //检查相机模式是否可用

    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

        NSLog(@"sorry, no camera or camera is unavailable!!!");

        return;

    }

    //获得相机模式下支持的媒体类型

    NSArray* availableMediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];

    BOOL canTakeVideo = NO;

    for (NSString* mediaType in availableMediaTypes) {

        if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {

            //支持摄像

            canTakeVideo = YES;

            break;

        }

    }

    //检查是否支持摄像

    if (!canTakeVideo) {

        NSLog(@"sorry, capturing video is not supported.!!!");

        return;

    }

    //创建图像选取控制器

    UIImagePickerController* imagePickerController = [[UIImagePickerController alloc] init];

    //设置图像选取控制器的来源模式为相机模式

    imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;

    //设置图像选取控制器的类型为动态图像

    imagePickerController.mediaTypes = [[[NSArray alloc] initWithObjects:(NSString*)kUTTypeMovie, nil]autorelease];

    //设置摄像图像品质

    imagePickerController.videoQuality = UIImagePickerControllerQualityTypeHigh;

    //设置最长摄像时间

    imagePickerController.videoMaximumDuration = 30;

    //允许用户进行编辑

    imagePickerController.allowsEditing = YES;

    //设置委托对象

    imagePickerController.delegate = self;

    //以模式视图控制器的形式显示

    [self presentModalViewController:imagePickerController animated:YES];

    [imagePickerController release];

    

}


- (void)image:(UIImage*)image didFinishSavingWithError:(NSError*)error contextInfo:(void*)contextInfo{

    if (!error) {

        NSLog(@"picture saved with no error.");

    }

    else

    {

        NSLog(@"error occured while saving the picture%@", error);

    }

}


- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{

    //打印出字典中的内容

    NSLog(@"get the media info: %@", info);

    //获取媒体类型

    NSString* mediaType = [info objectForKey:UIImagePickerControllerMediaType];

    //判断是静态图像还是视频

    if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {

        //获取用户编辑之后的图像

    UIImage* editedImage = [info objectForKey:UIImagePickerControllerEditedImage];

        //将该图像保存到媒体库中

                                UIImageWriteToSavedPhotosAlbum(editedImage, self,@selector(image:didFinishSavingWithError:contextInfo:), NULL);

    }else if ([mediaType isEqualToString:(NSString *)kUTTypeMovie])

                                {

                                    //获取视频文件的url

                                    NSURL* mediaURL = [info objectForKey:UIImagePickerControllerMediaURL];

                                    //创建ALAssetsLibrary对象并将视频保存到媒体库

                                    ALAssetsLibrary* assetsLibrary = [[ALAssetsLibrary alloc] init];

                                    [assetsLibrary writeVideoAtPathToSavedPhotosAlbum:mediaURLcompletionBlock:^(NSURL *assetURL, NSError *error) {

                                        if (!error) {

                                            NSLog(@"captured video saved with no error.");

                                        }else

                                        {

                                            NSLog(@"error occured while saving the video:%@", error);

                                        }

                                    }];

                                    [assetsLibrary release];

                                }

                                [picker dismissModalViewControllerAnimated:YES];

    

}


- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{

    [picker dismissModalViewControllerAnimated:YES];

}

                                

- (void)viewDidLoad

{

    [super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

}


- (void)viewDidUnload

{

    [super viewDidUnload];

    // Release any retained subviews of the main view.

}


- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);

}


@end


参考:http://blog.csdn.net/pucker
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