iOS开发——闪光灯

　　还是那句很欠揍的话，没啥难度，直接上代码。

//

//  ViewController.m

//  Demo—闪光灯

//

//  Created by yyt on 16/4/21.

//  Copyright © 2016年 yyt. All rights reserved.

//

#import "ViewController.h"

#import <AVFoundation/AVFoundation.h>

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    UIButton *lightButton = [UIButton buttonWithType:UIButtonTypeCustom];

    lightButton.frame = CGRectMake(20, 160, self.view.bounds.size.width-40, 40);

    lightButton.backgroundColor = [UIColor orangeColor];

    [lightButton setTitle:@"open" forState:UIControlStateNormal];

    [lightButton setTitle:@"close" forState:UIControlStateSelected];

    [lightButton addTarget:self action:@selector(clickLightButton:) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:lightButton];

}

- (void)clickLightButton:(UIButton *)sender {

    NSLog(@"闪光灯");

    sender.selected = !sender.selected;

    if (sender.selected) {

        [self turnTorchOn:YES];

    }

    else{

        [self turnTorchOn:NO];

    }

}

- (void)turnTorchOn:(BOOL)on

{

    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];

                

            } else {

                [device setTorchMode:AVCaptureTorchModeOff];

                [device setFlashMode:AVCaptureFlashModeOff];

            }

            [device unlockForConfiguration];

        }

    }

}

@end