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