feat:add scan qr code to iOS

iOS/Example/Example/DemoVC.m

@@ -26,6 +26,7 @@ - (instancetype)initWithPath:(NSString *)filePath {
 
 - (void)viewDidLoad {
     self.title = self.filePath;
+    self.view.backgroundColor = [UIColor whiteColor];
     NSString *path = [[NSBundle mainBundle] bundlePath];
     NSString *demoPath = [path stringByAppendingPathComponent:@"demo"];
     NSString *fullPath = [demoPath stringByAppendingPathComponent:self.filePath];

iOS/Example/Example/Info.plist

@@ -2,6 +2,8 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>NSCameraUsageDescription</key>
+	<string>Scan QR Code</string>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 	<key>CFBundleExecutable</key>

iOS/Example/Example/QRScanViewController.h

@@ -0,0 +1,10 @@
+//
+// Created by pengfei.zhou on 2019/11/21.
+// Copyright (c) 2019 pengfei.zhou. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import <UIKit/UIKit.h>
+
+@interface QRScanViewController : UIViewController
+@end

iOS/Example/Example/QRScanViewController.m

@@ -0,0 +1,93 @@
+//
+// Created by pengfei.zhou on 2019/11/21.
+// Copyright (c) 2019 pengfei.zhou. All rights reserved.
+//
+
+#import "QRScanViewController.h"
+#import <AVFoundation/AVFoundation.h>
+#import "Doric.h"
+
+@interface QRScanViewController () <AVCaptureMetadataOutputObjectsDelegate>
+@property(strong, nonatomic) AVCaptureDevice *device;
+@property(strong, nonatomic) AVCaptureDeviceInput *input;
+@property(strong, nonatomic) AVCaptureMetadataOutput *output;
+@property(strong, nonatomic) AVCaptureSession *session;
+@property(strong, nonatomic) AVCaptureVideoPreviewLayer *previewLayer;
+@property(strong, nonatomic) UIPinchGestureRecognizer *pinchGes;
+@property(assign, nonatomic) CGFloat scanRegion_W;
+@property(assign, nonatomic) CGFloat initScale;
+@end
+
+@implementation QRScanViewController
+- (void)viewDidLoad {
+    [super viewDidLoad];
+    self.title = @"扫一扫";
+    [self configBasicDevice];
+    [self configPinchGes];
+    [self.session startRunning];
+}
+
+- (void)configBasicDevice {
+    self.device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
+    self.input = [[AVCaptureDeviceInput alloc] initWithDevice:self.device error:nil];
+    self.output = [[AVCaptureMetadataOutput alloc] init];
+    [self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
+    self.session = [[AVCaptureSession alloc] init];
+    [self.session setSessionPreset:AVCaptureSessionPresetHigh];
+    if ([self.session canAddInput:self.input]) {
+        [self.session addInput:self.input];
+    }
+    if ([self.session canAddOutput:self.output]) {
+        [self.session addOutput:self.output];
+    }
+    [self.output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]];
+    [self.output setRectOfInterest:CGRectMake(0, 0, 1, 1)];
+    self.previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];
+    self.previewLayer.frame = CGRectMake(0, 0, self.view.width, self.view.height);
+    self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
+    [self.view.layer addSublayer:self.previewLayer];
+}
+
+- (void)configPinchGes {
+    self.pinchGes = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchDetected:)];
+    [self.view addGestureRecognizer:self.pinchGes];
+}
+
+- (void)pinchDetected:(UIPinchGestureRecognizer *)recogniser {
+    if (!_device) {
+        return;
+    }
+    if (recogniser.state == UIGestureRecognizerStateBegan) {
+        _initScale = _device.videoZoomFactor;
+    }
+    NSError *error = nil;
+    [_device lockForConfiguration:&error];
+    if (!error) {
+        CGFloat zoomFactor;
+        CGFloat scale = recogniser.scale;
+        if (scale < 1.0f) {
+            zoomFactor = self.initScale - pow(self.device.activeFormat.videoMaxZoomFactor, 1.0f - recogniser.scale);
+        } else {
+            zoomFactor = self.initScale + pow(self.device.activeFormat.videoMaxZoomFactor, (recogniser.scale - 1.0f) / 2.0f);
+        }
+        zoomFactor = MIN(15.0f, zoomFactor);
+        zoomFactor = MAX(1.0f, zoomFactor);
+        _device.videoZoomFactor = zoomFactor;
+        [_device unlockForConfiguration];
+    }
+}
+
+#pragma mark - AVCaptureMetadataOutputObjectsDelegate
+
+- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {
+    [self.session stopRunning];
+    if ([metadataObjects count] >= 1) {
+        AVMetadataMachineReadableCodeObject *qrObject = [metadataObjects lastObject];
+        NSString *result = qrObject.stringValue;
+        NSLog(@"Scan result is %@", result);
+        [[DoricDriver instance] connectDevKit:[NSString stringWithFormat:@"ws://%@:7777", result]];
+        showToast([NSString stringWithFormat:@"Connected to %@", result], BOTTOM);
+        [self.navigationController popViewControllerAnimated:NO];
+    }
+}
+@end

iOS/Example/Example/ViewController.m

@@ -9,6 +9,7 @@
 #import "ViewController.h"
 #import "Doric.h"
 #import "DemoVC.h"
+#import "QRScanViewController.h"
 
 @interface ViewController () <UITableViewDelegate, UITableViewDataSource>
 @property(nonatomic, copy) NSArray <NSString *> *demoFilePaths;
@@ -25,6 +26,9 @@ - (void)viewDidLoad {
     self.demoFilePaths = [[mgr subpathsAtPath:demoPath] filter:^BOOL(NSString *obj) {
         return ![obj containsString:@".map"];
     }];
+    NSMutableArray <NSString *> *tmp = [self.demoFilePaths mutableCopy];
+    [tmp insertObject:@"Dev Kit" atIndex:0];
+    self.demoFilePaths = tmp;
     [self.view addSubview:[[UITableView new] also:^(UITableView *it) {
         it.width = self.view.width;
         it.height = self.view.height;
@@ -50,6 +54,10 @@ - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(N
 }
 
 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
+    if (indexPath.row == 0) {
+        [self.navigationController pushViewController:[QRScanViewController new] animated:NO];
+        return;
+    }
     DemoVC *demoVC = [[DemoVC alloc] initWithPath:self.demoFilePaths[(NSUInteger) indexPath.row]];
     [self.navigationController pushViewController:demoVC animated:NO];
 }