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:
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//? Created by 張茫原 on 13-1-23.
//? Copyright (c) 2013年 張茫原. All rights reserved.
//
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#import
//調用閃光燈調用框架
#import
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@interface CameraViewController : UIViewController
{
??? AVCaptureSession * _AVSession;//調用閃光燈的時候創建的類
}
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@property(nonatomic,retain)AVCaptureSession * AVSession;
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@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。
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//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];
??? }
}
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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：
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//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];
}
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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：
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-(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];
}
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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
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-(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];
}
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以上就是IOS調用系統相機閃光燈的實例，希望大家能夠喜歡，更多內容請繼續關注武林技術頻道網站！
