ios 如何打开/关闭 iPhone 相机闪光灯？
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时间：2020-08-30 19:48:13 来源:igfitidea点击:
How to turn the iPhone camera flash on/off?
提问by Shahid Aslam
How can I turn the iPhone's LED camera flash on/off programatically?
如何以编程方式打开/关闭 iPhone 的 LED 相机闪光灯？
回答by Tibidabo
#import <AVFoundation/AVFoundation.h>
...
...
- (void) turnTorchOn: (bool) on {
// check if flashlight available
Class captureDeviceClass = NSClassFromString(@"AVCaptureDevice");
if (captureDeviceClass != nil) {
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if ([device hasTorch] && [device hasFlash]){
[device lockForConfiguration:nil];
if (on) {
[device setTorchMode:AVCaptureTorchModeOn];
[device setFlashMode:AVCaptureFlashModeOn];
//torchIsOn = YES; //define as a variable/property if you need to know status
} else {
[device setTorchMode:AVCaptureTorchModeOff];
[device setFlashMode:AVCaptureFlashModeOff];
//torchIsOn = NO;
}
[device unlockForConfiguration];
}
} }
回答by girish
I combined the timer with the above code.it worked for me...
我将计时器与上面的代码结合起来。它对我有用......
- (void)viewDidLoad
{
[super viewDidLoad];
myTimer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(toggleFlashlight) userInfo:nil repeats:YES];
// Do any additional setup after loading the view from its nib.
}
- (void) toggleFlashlight
{
// check if flashlight available
Class captureDeviceClass = NSClassFromString(@"AVCaptureDevice");
if (captureDeviceClass != nil) {
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if ([device hasTorch] && [device hasFlash]){
[device lockForConfiguration:nil];
if (device.torchMode == AVCaptureTorchModeOff)
{
[device setTorchMode:AVCaptureTorchModeOn];
[device setFlashMode:AVCaptureFlashModeOn];
//torchIsOn = YES;
}
else
{
[device setTorchMode:AVCaptureTorchModeOff];
[device setFlashMode:AVCaptureFlashModeOff];
// torchIsOn = NO;
}
[device unlockForConfiguration];
}
} }
