扫描二维码效果
源码：https://github.com/YouXianMing/Animations
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//
// QRCodeView.h
// QRCode
//
// Created by YouXianMing on 16/7/7.
// Copyright © 2016年 XianMing You. All rights reserved.
//
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
@class QRCodeView;
@protocol QRCodeViewDelegate <NSObject>
@optional
/**
* 获取QR的扫描结果
*
* @param codeView QRCodeView实体对象
* @param codeString 扫描字符串
*/
- (void)QRCodeView:(QRCodeView *)codeView codeString:(NSString *)codeString;
@end
@interface QRCodeView : UIView
/**
* 代理
*/
@property (nonatomic, weak) id <QRCodeViewDelegate> delegate;
/**
* 灯的状态,默认为关闭
*/
@property (nonatomic) AVCaptureTorchMode torchMode;
/**
* 敏感区域,如果不设置,则为全部扫描区域
*/
@property (nonatomic) CGRect interestArea;
/**
* 你用来添加自定义控件的view,尺寸与当前初始化的view一致
*/
@property (nonatomic, strong) UIView *contentView;
/**
* 正在运行当中
*/
@property (nonatomic, readonly) BOOL isRunning;
/**
* 开始扫描
*
* @return 如果成功,则返回YES,否则返回NO
*/
- (BOOL)start;
/**
* 结束扫描
*/
- (void)stop;
@end
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//
// QRCodeView.m
// QRCode
//
// Created by YouXianMing on 16/7/7.
// Copyright © 2016年 XianMing You. All rights reserved.
//
#import "QRCodeView.h"
@interface QRCodeView () <AVCaptureMetadataOutputObjectsDelegate>
@property (nonatomic) BOOL isRunning;
@property (nonatomic, strong) UIView *videoView;
@property (nonatomic, strong) AVCaptureDeviceInput *deviceInput;
@property (nonatomic, strong) AVCaptureDevice *captureDevice;
@property (nonatomic, strong) AVCaptureSession *captureSession;
@property (nonatomic, strong) AVCaptureVideoPreviewLayer *videoPreviewLayer;
@property (nonatomic, strong) AVCaptureMetadataOutput *captureMetadataOutput;
@end
@implementation QRCodeView
- (instancetype)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
self.videoView = [[UIView alloc] initWithFrame:self.bounds];
[self addSubview:self.videoView];
self.contentView = [[UIView alloc] initWithFrame:self.bounds];
[self addSubview:self.contentView];
self.captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
_torchMode = AVCaptureTorchModeOff;
[self addNotificationCenter];
}
return self;
}
#pragma mark - NSNotificationCenter related.
- (void)addNotificationCenter {
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(notificationCenterEvent:)
name:AVCaptureInputPortFormatDescriptionDidChangeNotification
object:nil];
}
- (void)removeNotificationCenter {
[[NSNotificationCenter defaultCenter] removeObserver:self
name:AVCaptureInputPortFormatDescriptionDidChangeNotification
object:nil];
}
- (void)notificationCenterEvent:(NSNotification *)sender {
if (self.interestArea.size.width && self.interestArea.size.height) {
self.captureMetadataOutput.rectOfInterest = [self.videoPreviewLayer metadataOutputRectOfInterestForRect:self.interestArea];
} else {
self.captureMetadataOutput.rectOfInterest = CGRectMake(0, 0, 1, 1);
}
}
#pragma mark - Start & Stop.
- (BOOL)start {
// 初始化输入流
BOOL result = NO;
NSError *error = nil;
self.deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:self.captureDevice error:&error];
if (self.deviceInput == nil) {
NSLog(@"%@", error);
return result;
}
// 创建会话
self.captureSession = [[AVCaptureSession alloc] init];
// 添加输入流
[self.captureSession addInput:self.deviceInput];
// 初始化输出流
self.captureMetadataOutput = [[AVCaptureMetadataOutput alloc] init];
// 添加输出流
[self.captureSession addOutput:self.captureMetadataOutput];
// 创建queue.
[self.captureMetadataOutput setMetadataObjectsDelegate:self queue:dispatch_queue_create(nil, nil)];
self.captureMetadataOutput.metadataObjectTypes = @[AVMetadataObjectTypeQRCode];
// 创建输出对象
self.videoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.captureSession];
self.videoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
self.videoPreviewLayer.frame = self.contentView.bounds;
[self.videoView.layer addSublayer:self.videoPreviewLayer];
// 开始
[self.captureSession startRunning];
self.isRunning = YES;
result = YES;
return result;
}
- (void)stop {
[self.captureSession stopRunning];
self.isRunning = NO;
self.captureSession = nil;
}
#pragma mark - AVCaptureMetadataOutputObjectsDelegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects
fromConnection:(AVCaptureConnection *)connection {
if (metadataObjects.count > 0) {
AVMetadataMachineReadableCodeObject *metadata = metadataObjects.firstObject;
NSString *result = nil;
if ([metadata.type isEqualToString:AVMetadataObjectTypeQRCode]) {
result = metadata.stringValue;
if (_delegate && [_delegate respondsToSelector:@selector(QRCodeView:codeString:)]) {
[_delegate QRCodeView:self codeString:result];
}
}
}
}
#pragma mark - Setter & Getter.
- (void)setTorchMode:(AVCaptureTorchMode)torchMode {
_torchMode = torchMode;
if (_deviceInput && [self.captureDevice hasTorch]) {
[self.captureDevice lockForConfiguration:nil];
[self.captureDevice setTorchMode:torchMode];
[self.captureDevice unlockForConfiguration];
}
}
#pragma mark - System method.
- (void)dealloc {
[self stop];
[self removeNotificationCenter];
}
@end
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