IOS 调用系统相机（备用）

IOS系统照相机的调用

其他代码

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IOS开发调用系统相机和打开闪光灯      今天给大家分享一下如何调用iphone的拍照功能和打开闪光灯，有些代码我也不太理解，很多是在网上借鉴其他人的。IOS有两种的拍照和视频的方式：1.直接使用UIImagePickerController，这个类提供了一个简单便捷的拍照与选择图片库里图片的功能。2.另一种是通过AVFoundation.framework框架完全自定义拍照的界面和选择图片库界面。我只做了第一种，就先给大家介绍第一种做法： 一、首先调用接口前，我们需要先判断当前设备是否支持UIImagePickerController，用isSourceTypeAvailable:来判断是否可用 二、查看符合的媒体类型，这个时候我们调用availableMediaTypeForSourceType：判断 在调用UIImagePickerController时我们需要加入他的两个代理方法： UINavigationControllerDelegate和UIImagePickerControllerDelegate，在调用摄像头的时候还可以调闪光灯，一会代码里有。 要调用闪光灯需要先建一个AVCaptureSession类的实例对象: // //  Created by Mason on 13-1-23. //  Copyright (c) 2013年 Mason. All rights reserved. //   #import <UIKit/UIKit.h> //调用闪光灯调用框架 #import <AVFoundation/AVFoundation.h>   @interface CameraViewController : UIViewController<UINavigationControllerDelegate, UIImagePickerControllerDelegate> {     AVCaptureSession * _AVSession;//调用闪光灯的时候创建的类 }   @property(nonatomic,retain)AVCaptureSession * AVSession;   @end 在.m的- (void)viewDidLoad里建立4Button，Camera调用相机、Library调用图片库、flashlight打开闪光灯、close关闭闪光灯 //打开相机 -(void)addCarema {     //判断是否可以打开相机，模拟器此功能无法使用     if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {                   UIImagePickerController * picker = [[UIImagePickerController alloc]init];         picker.delegate = self;         picker.allowsEditing = YES;  //是否可编辑         //摄像头         picker.sourceType = UIImagePickerControllerSourceTypeCamera;         [self presentModalViewController:picker animated:YES];         [picker release];     }else{         //如果没有提示用户         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"你没有摄像头" delegate:nil cancelButtonTitle:@"Drat!" otherButtonTitles:nil];         [alert show];     } } 打开相机后，然后需要调用UIImagePickerControllerDelegate里的方法，拍摄完成后执行的方法和点击Cancel之后执行的方法： //拍摄完成后要执行的方法 -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {     //得到图片     UIImage * image = [info objectForKey:UIImagePickerControllerOriginalImage];     //图片存入相册     UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);     [self dismissModalViewControllerAnimated:YES];       } //点击Cancel按钮后执行方法 -(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {     [self dismissModalViewControllerAnimated:YES]; } 调用相机照片和保存到图片库已经完成。 接着介绍打开照片库： -(void)openPicLibrary {     //相册是可以用模拟器打开的     if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {         UIImagePickerController * picker = [[UIImagePickerController alloc]init];         picker.delegate = self;         picker.allowsEditing = YES;//是否可以编辑           //打开相册选择照片         picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;         [self presentModalViewController:picker  animated:YES];         [picker release];     }else{         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"你没有摄像头" delegate:nil cancelButtonTitle:@"Drat!" otherButtonTitles:nil];         [alert show];     }       }   //选中图片进入的代理方法 -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo {     [self dismissModalViewControllerAnimated:YES]; } 调用闪光灯的代码，由于我也不是很理解，所以没法加注释，但是已经亲测可用，但是调闪光灯时有一个算是bug吧，闪光灯会闲一下，然后再一直亮 -(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]; }

描述：直接使用UIImagePickerController调用iphone的拍照功能和打开闪光灯