IOS有兩種的拍照和視頻的方式：
1.直接使用UIImagePickerController，這個類提供了一個簡單便捷的拍照與選擇圖片庫里圖片的功能。
2.另一種是通過AVFoundation.framework框架完全自定義拍照的界面和選擇圖片庫界面。我只做了第一種，就先給大家介紹第一種做法：
一、首先調用接口前，我們需要先判斷當前設備是否支持UIImagePickerController，用isSourceTypeAvailable:來判斷是否可用
二、查看符合的媒體類型，這個時候我們調用availableMediaTypeForSourceType：判斷
在調用UIImagePickerController時我們需要加入他的兩個代理方法：
UINavigationControllerDelegate和UIImagePickerControllerDelegate，在調用攝像頭的時候還可以調閃光燈，一會代碼里有。
要調用閃光燈需要先建一個AVCaptureSession類的實例對象:
復制代碼 代碼如下:
// Created by 張茫原 on 13-1-23.
// Copyright (c) 2013年 張茫原. All rights reserved.
//
#import <UIKit/UIKit.h>
//調用閃光燈調用框架
#import <AVFoundation/AVFoundation.h>
@interface CameraViewController : UIViewController<UINavigationControllerDelegate, UIImagePickerControllerDelegate>
{
AVCaptureSession * _AVSession;//調用閃光燈的時候創建的類
}
@property(nonatomic,retain)AVCaptureSession * AVSession;
@end
在.m的- (void)viewDidLoad里建立4Button，Camera調用相機、Library調用圖片庫、flashlight打開閃光燈、close關閉閃光燈,這里創建Button的代碼我就不再寫了。
復制代碼 代碼如下:
//打開相機
-(void)addCarema
{
//判斷是否可以打開相機，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];
}
}
打開相機后，然后需要調用UIImagePickerControllerDelegate里的方法，拍攝完成后執行的方法和點擊Cancel之后執行的方法：
復制代碼 代碼如下:
//拍攝完成后要執行的方法
-(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按鈕后執行方法
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
[self dismissModalViewControllerAnimated:YES];
}
調用相機照片和保存到圖片庫已經完成。
接著介紹打開照片庫：
復制代碼 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];
}
}
//選中圖片進入的代理方法
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo
{
[self dismissModalViewControllerAnimated:YES];
}
調用閃光燈的代碼，由于我也不是很理解，所以沒法加注釋，但是已經親測可用，但是調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];
}
以上所述就是本文的全部內容了，希望大家能夠喜歡。
