前言

近來(lái)項(xiàng)目已經(jīng)完結(jié),手上沒(méi)有太多的任務(wù),就想看一點(diǎn)以前沒(méi)看過(guò)的東西,其實(shí)閃光燈的使用并不是太常見(jiàn),而且調(diào)用比較簡(jiǎn)單,但是也是iOS學(xué)習(xí)過(guò)程中不可或缺的一部分.我總結(jié)閃光燈總共有三個(gè)功能,一是調(diào)用相機(jī)的時(shí)候充當(dāng)閃光燈的功能;而是手電筒的功能;三是提醒用戶(hù)的功能.今天就調(diào)用系統(tǒng)的閃光燈做一個(gè)簡(jiǎn)單的手電筒.雖然系統(tǒng)已經(jīng)自帶了手電筒,但我們只是通過(guò)手電筒的功能實(shí)現(xiàn),看看是如何調(diào)用的閃光燈.

系統(tǒng)自帶的閃光燈

iOS手電筒功能實(shí)現(xiàn)

首先,我們需要導(dǎo)入AVFoundation..framework框架.如下圖所示.

0AC16A72-DF16-4C0B-A5DD-9DDF70E50EDB.png

為了省時(shí)省力,我就直接在ViewController進(jìn)行了功能的實(shí)現(xiàn),代碼如下.

#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>

@interface ViewController ()

@property (strong, nonatomic) IBOutlet UIImageView *flashImage;//手電筒背景

@property(assign,nonatomic)BOOL isOpenFlashlight;//是否打開(kāi)手電

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.isOpenFlashlight = NO;

}

- (IBAction)flashLightAction:(id)sender {
    
    self.isOpenFlashlight = ! self.isOpenFlashlight;
    
    if (self.isOpenFlashlight) {
        
        self.flashImage.image = [UIImage imageNamed:@"打開(kāi)手電.png"];
        self.flashImage.contentMode = UIViewContentModeScaleAspectFill;
        
        [self openFlashlight];
    }else{
        
        self.flashImage.image = [UIImage imageNamed:@"關(guān)閉手電.png"];
        self.flashImage.contentMode = UIViewContentModeScaleAspectFill;
    
        [self closeFlashlight];
    
    }
    
}


#pragma mark --- 打開(kāi)手電/關(guān)閉手電 ---
-(void)openFlashlight
{
    AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    if (device.torchMode == AVCaptureTorchModeOff) {
        [device lockForConfiguration:nil];
        [device setTorchMode:AVCaptureTorchModeOn];
        [device unlockForConfiguration];
    }
}

-(void)closeFlashlight
{
    AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    if (device.torchMode == AVCaptureTorchModeOn) {
        [device lockForConfiguration:nil];
        [device setTorchMode:AVCaptureTorchModeOff];
        [device unlockForConfiguration];
    }}
@end

整體的功能核心代碼就是最后的 -(void)openFlashlight 和 -(void)closeFlashlight 兩個(gè)方法.首先找到閃光燈的設(shè)備,然后判斷閃光燈的狀態(tài),然后做出對(duì)應(yīng)的動(dòng)作就可以了.因?yàn)槟M機(jī)上是沒(méi)有攝像頭的,所以測(cè)試的全過(guò)程均為在iPhone真機(jī)上測(cè)試.我們看一下真機(jī)上的效果圖片.

關(guān)閉狀態(tài)

打開(kāi)狀態(tài)

今天就說(shuō)到這,喜歡這篇文章就點(diǎn)個(gè)贊吧,有任何疑問(wèn)可以隨意在評(píng)論區(qū)提出,謝謝大家.最后附上閃光手電筒的Demo.

----> ?? Demo