ViewController.m

//
//  ViewController.m
//  SGQRCodeExample
//
//  Created by kingsic on 16/8/25.
//  Copyright © 2016年 kingsic. All rights reserved.
//

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

@interface ViewController () <UITableViewDelegate, UITableViewDataSource>
@property (weak, nonatomic) IBOutlet UITableView *tableView;
@property (nonatomic, strong) NSArray *dataList;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self configuration];
}

- (void)configuration {
    _dataList = @[@"WBQRCodeVC (pop 逻辑处理）", @"WCQRCodeVC (popToRoot 逻辑处理)"];
    [_tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];
    _tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return _dataList.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
    cell.backgroundColor = [UIColor clearColor];
    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    cell.textLabel.text = _dataList[indexPath.row];
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    
    if (indexPath.row == 0) {
        WBQRCodeVC *WBVC = [[WBQRCodeVC alloc] init];
        [self QRCodeScanVC:WBVC];
    }
    
    if (indexPath.row == 1) {
        WCQRCodeVC *WCVC = [[WCQRCodeVC alloc] init];
        [self QRCodeScanVC:WCVC];
    }
}

- (void)QRCodeScanVC:(UIViewController *)scanVC {
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    if (device) {
        AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
        switch (status) {
                case AVAuthorizationStatusNotDetermined: {
                    [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
                        if (granted) {
                            dispatch_sync(dispatch_get_main_queue(), ^{
                                [self.navigationController pushViewController:scanVC animated:YES];
                            });
                            NSLog(@"用户第一次同意了访问相机权限 - - %@", [NSThread currentThread]);
                        } else {
                            NSLog(@"用户第一次拒绝了访问相机权限 - - %@", [NSThread currentThread]);
                        }
                    }];
                    break;
                }
                case AVAuthorizationStatusAuthorized: {
                    [self.navigationController pushViewController:scanVC animated:YES];
                    break;
                }
                case AVAuthorizationStatusDenied: {
                    UIAlertController *alertC = [UIAlertController alertControllerWithTitle:@"温馨提示" message:@"请去-> [设置 - 隐私 - 相机 - SGQRCodeExample] 打开访问开关" preferredStyle:(UIAlertControllerStyleAlert)];
                    UIAlertAction *alertA = [UIAlertAction actionWithTitle:@"确定" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction * _Nonnull action) {
                        
                    }];
                    
                    [alertC addAction:alertA];
                    [self presentViewController:alertC animated:YES completion:nil];
                    break;
                }
                case AVAuthorizationStatusRestricted: {
                    NSLog(@"因为系统原因, 无法访问相册");
                    break;
                }
                
            default:
                break;
        }
        return;
    }
    
    UIAlertController *alertC = [UIAlertController alertControllerWithTitle:@"温馨提示" message:@"未检测到您的摄像头" preferredStyle:(UIAlertControllerStyleAlert)];
    UIAlertAction *alertA = [UIAlertAction actionWithTitle:@"确定" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction * _Nonnull action) {
        
    }];
    
    [alertC addAction:alertA];
    [self presentViewController:alertC animated:YES completion:nil];
}


@end