//  Created by 張茫原 on 13-1-23.

//  Copyright (c) 2013年 張茫原. All rights reserved.

//

#import <UIKit/UIKit.h>

//調(diào)用閃光燈調(diào)用框架

#import <AVFoundation/AVFoundation.h>

@interface CameraViewController : UIViewController<UINavigationControllerDelegate, UIImagePickerControllerDelegate>

{

    AVCaptureSession * _AVSession;//調(diào)用閃光燈的時候創(chuàng)建的類

}

@property(nonatomic,retain)AVCaptureSession * AVSession;

@end

在.m的- (void)viewDidLoad里建立4Button，Camera調(diào)用相機(jī)、Library調(diào)用圖片庫、flashlight打開閃光燈、close關(guān)閉閃光燈,這里創(chuàng)建Button的代碼我就不再寫了。

復(fù)制代碼代碼如下:

//打開相機(jī)

-(void)addCarema

{

    //判斷是否可以打開相機(jī)，模擬器此功能無法使用

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

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

        picker.delegate = self;

        picker.allowsEditing = YES;  //是否可編輯

        //攝像頭

        picker.sourceType = UIImagePickerControllerSourceTypeCamera;

        [self presentModalViewController:picker animated:YES];

        [picker release];

    }else{

        //如果沒有提示用戶

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"你沒有攝像頭" delegate:nil cancelButtonTitle:@"Drat!" otherButtonTitles:nil];

        [alert show];

    }

}

打開相機(jī)后，然后需要調(diào)用UIImagePickerControllerDelegate里的方法，拍攝完成后執(zhí)行的方法和點擊Cancel之后執(zhí)行的方法：

復(fù)制代碼代碼如下:

//拍攝完成后要執(zhí)行的方法

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

{

    //得到圖片

    UIImage * image = [info objectForKey:UIImagePickerControllerOriginalImage];

    //圖片存入相冊

    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);

    [self dismissModalViewControllerAnimated:YES];

}

//點擊Cancel按鈕后執(zhí)行方法

-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker

{

    [self dismissModalViewControllerAnimated:YES];

}

調(diào)用相機(jī)照片和保存到圖片庫已經(jīng)完成。

接著介紹打開照片庫：

復(fù)制代碼代碼如下:

-(void)openPicLibrary

{

    //相冊是可以用模擬器打開的

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {

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

        picker.delegate = self;

        picker.allowsEditing = YES;//是否可以編輯

        //打開相冊選擇照片

        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

        [self presentModalViewController:picker  animated:YES];

        [picker release];

    }else{

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"你沒有攝像頭" delegate:nil cancelButtonTitle:@"Drat!" otherButtonTitles:nil];

        [alert show];

    }

}

//選中圖片進(jìn)入的代理方法

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo

{

    [self dismissModalViewControllerAnimated:YES];

}

調(diào)用閃光燈的代碼，由于我也不是很理解，所以沒法加注釋，但是已經(jīng)親測可用，但是調(diào)閃光燈時有一個算是bug吧，閃光燈會閑一下，然后再一直亮

復(fù)制代碼代碼如下:

-(void)openFlashlight

{

    AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

    if (device.torchMode == AVCaptureTorchModeOff) {

        //Create an AV session

        AVCaptureSession * session = [[AVCaptureSession alloc]init];

        // Create device input and add to current session

        AVCaptureDeviceInput * input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];

        [session addInput:input];

        // Create video output and add to current session

        AVCaptureVideoDataOutput * output = [[AVCaptureVideoDataOutput alloc]init];

        [session addOutput:output];

        // Start session configuration

        [session beginConfiguration];

        [device lockForConfiguration:nil];

        // Set torch to on

        [device setTorchMode:AVCaptureTorchModeOn];

        [device unlockForConfiguration];

        [session commitConfiguration];

        // Start the session

        [session startRunning];

        // Keep the session around

        [self setAVSession:self.AVSession];

        [output release];

    }

}

-(void)closeFlashlight

{

    [self.AVSession stopRunning];

    [self.AVSession release];

}