由于项目需求，程序需要实现自定义界面二维码扫描功能，所以我找了一下系统二维码扫描的方法。
下面是我封装代码：
.h里的代码：
#import <Foundation/Foundation.h>
#import <AVFoundation/AVFoundation.h>
@interface ZHSearchScanHelper : NSObject <AVCaptureMetadataOutputObjectsDelegate>
@property (strong, nonatomic) void(^ScanBlock)(NSString * str);
/* 输入输出中间桥梁 */
@property (strong, nonatomic) AVCaptureSession * session;
/* 设备 */
@property (strong, nonatomic) AVCaptureDevice * device;
/* 采集设备输入 */
@property (strong, nonatomic) AVCaptureDeviceInput * input;
/* 捕捉元数据输出 */
@property (strong, nonatomic) AVCaptureMetadataOutput * output;
/* 扫描的View */
@property (strong, nonatomic) UIView * scanView;
/* 捕捉视频预览层 */
@property (strong, nonatomic) AVCaptureVideoPreviewLayer * layer;
/* 图层父类 */
@property (strong, nonatomic) UIView * superView;
/* 为了做扫描动画的定时器 */
@property (strong, nonatomic) NSTimer * timer;
/* 扫描动画的横线 */
@property (strong, nonatomic) UIImageView * lineImage;
+(instancetype)manager;
-(void)startRunning;
-(void)stopRunning;
-(void)stopSetView;
-(void)showLayer:(UIView *)viewController;
-(void)setscanningRect:(CGRect)scanRect scanView:(UIView *)scanView;
@end
.m里的代码：
+(instancetype)manager
{
static ZHSearchScanHelper * manager = nil;
static dispatch_once_t once_Token;
dispatch_once(&once_Token, ^{
manager = [[ZHSearchScanHelper alloc]init];
});
return manager;
}
-(instancetype)init
{
if (self = [super init]) {
// Session初始化
_session = [[AVCaptureSession alloc]init];
// 高质量采样率
[_session setSessionPreset:AVCaptureSessionPresetHigh];
// 避免模拟器运行崩溃
if (!TARGET_IPHONE_SIMULATOR) {
// Device
_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
// Input 输入流
_input = [AVCaptureDeviceInput deviceInputWithDevice:_device error:nil];
if ([_session canAddInput:_input])
{
[_session addInput:_input];
}
// Output 输出流
_output = [[AVCaptureMetadataOutput alloc]init];
// 设置代理 在主线程刷新
[_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
if ([_session canAddOutput:_output])
{
[_session addOutput:_output];
}
// 设置扫码支持的编码格式
// 条码类型 AVMetadataObjectTypeQRCode
_output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode,
AVMetadataObjectTypeEAN13Code,
AVMetadataObjectTypeEAN8Code,
AVMetadataObjectTypeCode128Code];
// 更新界面
_layer = [AVCaptureVideoPreviewLayer layerWithSession:_session];
_layer.videoGravity = AVLayerVideoGravityResizeAspectFill;
}
}
return self;
}
#pragma mark 方法
// 开始
-(void)startRunning
{
if (!TARGET_IPHONE_SIMULATOR) {
[_session startRunning];
}
}
// 停止
-(void)stopRunning
{
if (!TARGET_IPHONE_SIMULATOR) {
[_session stopRunning];
}
}
#pragma mark delegate
-(void)captureOutput:(AVCaptureOutput *)output didOutputMetadataObjects:(NSArray<__kindof AVMetadataObject *> *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
NSString *stringValue;
if (metadataObjects.count > 0) {
AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];
stringValue = metadataObject.stringValue;
// 传值
if (self.ScanBlock) {
self.ScanBlock(stringValue);
}
// 停止
[self stopSetView];
NSLog(@"%@",stringValue);
}
}
/* 停止设置 */
-(void)stopSetView
{
// 结束
[_session stopRunning];
// 移除界面
for (UIView * view in self.superView.subviews) {
[view removeFromSuperview];
}
// 计时器停止
[_timer invalidate];
_timer = nil;
}
/*
设置扫描区域
@param scanRect 扫描范围
@param scanRect 扫描框
*/
-(void)setscanningRect:(CGRect)scanRect scanView:(UIView *)scanView
{
CGFloat x,y,width,height;
x = scanRect.origin.y / _layer.frame.size.height;
y = scanRect.origin.x / _layer.frame.size.width;
width = scanRect.size.height / _layer.frame.size.height;
height = scanRect.size.width / _layer.frame.size.width;
_output.rectOfInterest = CGRectMake(x, y, width, height);
self.scanView = scanView;
if (self.scanView) {
self.scanView.frame = scanRect;
if (self.superView) {
[self.superView addSubview:_scanView];
[self setCover:_scanView];
}
}
}
/* 添加图层 */
-(void)showLayer:(UIView *)viewController
{
_superView = viewController;
_layer.frame = _superView.layer.frame;
[_superView.layer insertSublayer:_layer atIndex:0];
}
// 167 167 167 32 居上50
/* 设置覆盖层界面 */
-(void)setCover:(UIView *)view
{
UIColor * color = [UIColor blackColor];
UIView * view_1 = [[UIView alloc]initWithFrame:CGRectMake(0, 0, self.superView.bounds.size.width, view.frame.origin.y)];
view_1.backgroundColor = color;
view_1.alpha = 0.8;
[self.superView addSubview:view_1];
UIView * view_2 = [[UIView alloc]initWithFrame:CGRectMake(0, view.frame.origin.y+view.frame.size.height, self.superView.bounds.size.width, self.superView.bounds.size.height-(view.frame.origin.y+view.frame.size.height))];
view_2.backgroundColor = color;
view_2.alpha = 0.8;
[self.superView addSubview:view_2];
UIView * view_3 = [[UIView alloc]initWithFrame:CGRectMake(0, view.frame.origin.y, view.frame.origin.x, view.frame.size.height)];
view_3.backgroundColor = color;
view_3.alpha = 0.8;
[self.superView addSubview:view_3];
UIView * view_4 = [[UIView alloc]initWithFrame:CGRectMake(view.frame.origin.x+view.frame.size.width, view.frame.origin.y, view.frame.origin.x, view.frame.size.height)];
view_4.backgroundColor = color;
view_4.alpha = 0.8;
[self.superView addSubview:view_4];
UIImageView * imageV = [[UIImageView alloc]initWithFrame:view.bounds];
imageV.image = [UIImage imageNamed:@"fo_bi"];
imageV.backgroundColor = [UIColor clearColor];
[view addSubview:imageV];
UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(0, view.frame.origin.y+view.frame.size.height+50*kScale, self.superView.bounds.size.width, 50*kScale)];
label.text = @"将二维码/条码放入框内，即可自动扫描";
label.textColor = JMColor(167, 167, 167);
label.font = [UIFont systemFontOfSize:32*kScale];
label.textAlignment = NSTextAlignmentCenter;
label.backgroundColor = [UIColor clearColor];
[self.superView addSubview:label];
_lineImage = [[UIImageView alloc]initWithFrame:CGRectMake(20*kScale, 30*kScale, view.bounds.size.width-40*kScale, 16*kScale)];
_lineImage.image = [UIImage imageNamed:@"green_line"];
_lineImage.backgroundColor = [UIColor clearColor];
[view addSubview:_lineImage];
NSTimer *timer = [NSTimer timerWithTimeInterval:2.5 target:self selector:@selector(timerLineChangeFrame:) userInfo:@(YES) repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
self.timer = timer;
}
-(void)timerLineChangeFrame:(NSTimer *)timer
{
[self animated];
}
#pragma mark 动画
- (void)animated
{
_lineImage.frame = CGRectMake(20*kScale, 30*kScale, _scanView.bounds.size.width-40*kScale, 16*kScale);
[UIView animateWithDuration:2.5 animations:^{
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
_lineImage.frame = CGRectMake(20*kScale, _scanView.bounds.size.height-30*kScale-16*kScale, _lineImage.superview.bounds.size.width-40*kScale, 8*kScale);
}];
}
在父类使用：
设置扫描界面
-(void)setScanView
{
WeakSelf(weakSelf);
CGSize windowSize = [UIScreen mainScreen].bounds.size;
CGSize scanSize = CGSizeMake(windowSize.width * 3/5, windowSize.width *3/5);
CGRect scanRect = CGRectMake((windowSize.width-scanSize.width)/2, 300*kScale, scanSize.width, scanSize.height);
UIView * scanRectView = [UIView new];
scanRectView.layer.borderColor = [UIColor clearColor].CGColor;
scanRectView.layer.borderWidth = 0;
[[ZHSearchScanHelper manager] showLayer:self.view];
[[ZHSearchScanHelper manager] setscanningRect:scanRect scanView:scanRectView];
[[ZHSearchScanHelper manager] setScanBlock:^(NSString *scanResult)
{
NSLog(@"---%@", scanResult);
// 根据自己的需要对扫描结果进行处理
// 获取数据
[weakSelf getProductionData:scanResult];
}];
[[ZHSearchScanHelper manager] startRunning];
}
