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QRCodeReaderViewController.mm
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QRCodeReaderViewController.mm
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/*
* QRCodeReaderViewController
*
* Copyright 2014-present Yannick Loriot.
* http://yannickloriot.com
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#import "QRCodeReaderViewController.h"
#import "QRCodeReaderView.h"
@interface QRCodeReaderViewController ()
@property (strong, nonatomic) QRCodeReaderView *cameraView;
@property (strong, nonatomic) UIButton *cancelButton;
@property (strong, nonatomic) QRCodeReader *codeReader;
@property (assign, nonatomic) BOOL startScanningAtLoad;
@property (copy, nonatomic) void (^completionBlock) (NSString * __nullable);
@end
@implementation QRCodeReaderViewController
- (void)dealloc
{
[self stopScanning];
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
- (id)init
{
return [self initWithCancelButtonTitle:nil];
}
- (id)initWithCancelButtonTitle:(NSString *)cancelTitle
{
return [self initWithCancelButtonTitle:cancelTitle metadataObjectTypes:@[AVMetadataObjectTypeQRCode]];
}
- (id)initWithMetadataObjectTypes:(NSArray *)metadataObjectTypes
{
return [self initWithCancelButtonTitle:nil metadataObjectTypes:metadataObjectTypes];
}
- (id)initWithCancelButtonTitle:(NSString *)cancelTitle metadataObjectTypes:(NSArray *)metadataObjectTypes
{
QRCodeReader *reader = [QRCodeReader readerWithMetadataObjectTypes:metadataObjectTypes];
return [self initWithCancelButtonTitle:cancelTitle codeReader:reader];
}
- (id)initWithCancelButtonTitle:(NSString *)cancelTitle codeReader:(QRCodeReader *)codeReader
{
return [self initWithCancelButtonTitle:cancelTitle codeReader:codeReader startScanningAtLoad:true];
}
- (id)initWithCancelButtonTitle:(NSString *)cancelTitle codeReader:(QRCodeReader *)codeReader startScanningAtLoad:(BOOL)startScanningAtLoad
{
if ((self = [super init])) {
self.view.backgroundColor = [UIColor blackColor];
self.codeReader = codeReader;
self.startScanningAtLoad = startScanningAtLoad;
if (cancelTitle == nil) {
cancelTitle = NSLocalizedString(@"Cancel", @"Cancel");
}
[self setupUIComponentsWithCancelButtonTitle:cancelTitle];
[self setupAutoLayoutConstraints];
[_cameraView.layer insertSublayer:_codeReader.previewLayer atIndex:0];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChanged:) name:UIDeviceOrientationDidChangeNotification object:nil];
[codeReader setCompletionWithBlock:^(NSString *resultAsString) {
if (self.completionBlock != nil) {
self.completionBlock(resultAsString);
}
if (self.delegate && [self.delegate respondsToSelector:@selector(reader:didScanResult:)]) {
[self.delegate reader:self didScanResult:resultAsString];
}
}];
/*
__weak __typeof__(self) weakSelf = self;
[codeReader setCompletionWithBlock:^(NSString *resultAsString) {
if (weakSelf.completionBlock != nil) {
weakSelf.completionBlock(resultAsString);
}
if (weakSelf.delegate && [weakSelf.delegate respondsToSelector:@selector(reader:didScanResult:)]) {
[weakSelf.delegate reader:weakSelf didScanResult:resultAsString];
}
}];
*/
}
return self;
}
+ (instancetype)readerWithCancelButtonTitle:(NSString *)cancelTitle
{
return [[self alloc] initWithCancelButtonTitle:cancelTitle];
}
+ (instancetype)readerWithMetadataObjectTypes:(NSArray *)metadataObjectTypes
{
return [[self alloc] initWithMetadataObjectTypes:metadataObjectTypes];
}
+ (instancetype)readerWithCancelButtonTitle:(NSString *)cancelTitle metadataObjectTypes:(NSArray *)metadataObjectTypes
{
return [[self alloc] initWithCancelButtonTitle:cancelTitle metadataObjectTypes:metadataObjectTypes];
}
+ (instancetype)readerWithCancelButtonTitle:(NSString *)cancelTitle codeReader:(QRCodeReader *)codeReader
{
return [[self alloc] initWithCancelButtonTitle:cancelTitle codeReader:codeReader];
}
+ (instancetype)readerWithCancelButtonTitle:(NSString *)cancelTitle codeReader:(QRCodeReader *)codeReader startScanningAtLoad:(BOOL)startScanningAtLoad
{
return [[self alloc] initWithCancelButtonTitle:cancelTitle codeReader:codeReader startScanningAtLoad:startScanningAtLoad];
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
if (_startScanningAtLoad) {
[self startScanning];
}
}
- (void)viewWillDisappear:(BOOL)animated
{
[self stopScanning];
[super viewWillDisappear:animated];
}
- (void)viewWillLayoutSubviews
{
[super viewWillLayoutSubviews];
_codeReader.previewLayer.frame = self.view.bounds;
}
- (BOOL)shouldAutorotate
{
return YES;
}
#pragma mark - Controlling the Reader
- (void)startScanning {
[_codeReader startScanning];
}
- (void)stopScanning {
[_codeReader stopScanning];
}
#pragma mark - Managing the Orientation
- (void)orientationChanged:(NSNotification *)notification
{
[_cameraView setNeedsDisplay];
if (_codeReader.previewLayer.connection.isVideoOrientationSupported) {
UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
_codeReader.previewLayer.connection.videoOrientation = [QRCodeReader videoOrientationFromInterfaceOrientation:
orientation];
}
}
#pragma mark - Managing the Block
- (void)setCompletionWithBlock:(void (^) (NSString *resultAsString))completionBlock
{
self.completionBlock = completionBlock;
}
#pragma mark - Initializing the AV Components
- (void)setupUIComponentsWithCancelButtonTitle:(NSString *)cancelButtonTitle
{
self.cameraView = [[QRCodeReaderView alloc] init];
_cameraView.translatesAutoresizingMaskIntoConstraints = NO;
_cameraView.clipsToBounds = YES;
[self.view addSubview:_cameraView];
[_codeReader.previewLayer setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
if ([_codeReader.previewLayer.connection isVideoOrientationSupported]) {
UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
_codeReader.previewLayer.connection.videoOrientation = [QRCodeReader videoOrientationFromInterfaceOrientation:orientation];
}
self.cancelButton = [[UIButton alloc] init];
_cancelButton.translatesAutoresizingMaskIntoConstraints = NO;
[_cancelButton setTitle:cancelButtonTitle forState:UIControlStateNormal];
[_cancelButton setTitleColor:[UIColor grayColor] forState:UIControlStateHighlighted];
[_cancelButton addTarget:self action:@selector(cancelAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:_cancelButton];
}
- (void)setupAutoLayoutConstraints
{
NSDictionary *views = NSDictionaryOfVariableBindings(_cameraView, _cancelButton);
[self.view addConstraints:
[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[_cameraView][_cancelButton(40)]|" options:0 metrics:nil views:views]];
[self.view addConstraints:
[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[_cameraView]|" options:0 metrics:nil views:views]];
[self.view addConstraints:
[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[_cancelButton]-|" options:0 metrics:nil views:views]];
}
- (void)switchDeviceInput
{
[_codeReader switchDeviceInput];
}
#pragma mark - Catching Button Events
- (void)cancelAction:(UIButton *)button
{
[_codeReader stopScanning];
if (_completionBlock) {
_completionBlock(nil);
}
if (_delegate && [_delegate respondsToSelector:@selector(readerDidCancel:)]) {
[_delegate readerDidCancel:self];
}
}
- (void)switchCameraAction:(UIButton *)button
{
[self switchDeviceInput];
}
- (void)toggleTorchAction:(UIButton *)button
{
[_codeReader toggleTorch];
}
@end