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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:
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,这里创建Button的代码我就不再写了。
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:
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
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 张茫原 on 13-1-23. // Copyright (c) 2013年 张茫原. 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,这里创建Button的代码我就不再写了。
//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]; }