iPhone4 flashlight on/off LED燈開關

目前鏡頭旁邊的led燈似乎只有在iphone4才有，不過說真的這小小的led燈還真的蠻好用的，在app store上也可以看到一大堆類似的軟體。

step1.在.h檔內先將framework給import進來
//import framework
#import <AVFoundation/AVFoundation.h>


//宣告變數並將這變數交由property管理
AVCaptureSession *torchSession;

@property (nonatomic, retain) AVCaptureSession *torchSession;


step2.回到.m檔內記得在@@implementation及@end間加上synthesize
@synthesize torchSession;


step3.開關LED燈的函數
-(void) openLED{
NSLog(@"click openLED");
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if ([device hasTorch] && [device hasFlash]){
if (device.torchMode == AVCaptureTorchModeOff) {

NSLog(@"On");

AVCaptureDeviceInput *flashInput = [AVCaptureDeviceInput deviceInputWithDevice:device error: nil];
AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init];

AVCaptureSession *session = [[AVCaptureSession alloc] init];

[session beginConfiguration];
[device lockForConfiguration:nil];

[device setTorchMode:AVCaptureTorchModeOn];
[device setFlashMode:AVCaptureFlashModeOn];

[session addInput:flashInput];
[session addOutput:output];

[device unlockForConfiguration];

[output release];

[session commitConfiguration];
[session startRunning];

[self setTorchSession:session];
[session release];
}
else {
NSLog(@"Off");
[torchSession stopRunning];
}
}
}

step4.記得在dealloc把宣告過的東西release掉
- (void)dealloc {
[torchSession release];
[super dealloc];
}

step5.加入framework


step6.開始玩LED燈

相關連結
iOS Developer Library