IOS開發(fā)調(diào)用系統(tǒng)相機(jī)和打開閃光燈
?
? ?今天給大家分享一下如何調(diào)用iphone的拍照功能和打開閃光燈，有些代碼我也不太理解，很多是在網(wǎng)上借鑒其他人的。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(diào)用接口前，我們需要先判斷當(dāng)前設(shè)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(diào)用availableMediaTypeForSourceType：判斷
在調(diào)用UIImagePickerController時我們需要加入他的兩個代理方法：
UINavigationControllerDelegate和UIImagePickerControllerDelegate，在調(diào)用攝像頭的時候還可以調(diào)閃光燈，一會代碼里有。

要調(diào)用閃光燈需要先建一個AVCaptureSession類的實例對象:

[java]?view plaincopy

#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

[java]?view plaincopy

//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：

[java]?view plaincopy

//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：
[java]?view plaincopy

-(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

[java]?view plaincopy

-(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];??

} ?

總結(jié)

以上是生活随笔為你收集整理的IOS开发调用系统相机和打开闪光灯的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯，歡迎將生活随笔推薦給好友。