session-ios/Signal/src/ViewControllers/OWSQRCodeScanningViewController.m
2017-03-31 11:58:52 -04:00

178 lines
4.6 KiB
Objective-C

// Copyright © 2016 Open Whisper Systems. All rights reserved.
#import "OWSQRCodeScanningViewController.h"
#import "UIColor+OWS.h"
//#import <ZXingObjC/ZXingObjC.h>
@interface OWSQRCodeScanningViewController ()
@property (nonatomic) BOOL captureEnabled;
@property (atomic, strong) ZXCapture *capture;
@property UIView *maskingView;
@property CALayer *maskingLayer;
@end
@implementation OWSQRCodeScanningViewController
- (void)dealloc
{
[self.capture.layer removeFromSuperlayer];
}
- (instancetype)init
{
self = [super init];
if (!self) {
return self;
}
_captureEnabled = NO;
return self;
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (!self) {
return self;
}
_captureEnabled = NO;
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.maskingView = [[UIView alloc] initWithFrame:self.view.frame];
[self.view addSubview:self.maskingView];
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
if (self.captureEnabled) {
[self startCapture];
}
}
- (void)viewDidLayoutSubviews
{
[super viewDidLayoutSubviews];
[self layoutMaskingView];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[self stopCapture];
}
- (void)layoutMaskingView
{
self.maskingView.frame = self.view.frame;
if (self.maskingLayer) {
[self.maskingLayer removeFromSuperlayer];
}
self.maskingLayer = [self buildCircularMaskingLayer];
[self.maskingView.layer addSublayer:self.maskingLayer];
}
- (void)startCapture
{
self.captureEnabled = YES;
if (!self.capture) {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
self.capture = [[ZXCapture alloc] init];
self.capture.camera = self.capture.back;
self.capture.focusMode = AVCaptureFocusModeContinuousAutoFocus;
self.capture.layer.frame = self.view.frame;
self.capture.delegate = self;
dispatch_async(dispatch_get_main_queue(), ^{
[self.view.layer addSublayer:self.capture.layer];
[self.view bringSubviewToFront:self.maskingView];
[self.capture start];
});
});
} else {
[self.capture start];
}
}
- (void)stopCapture
{
self.captureEnabled = NO;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[self.capture stop];
});
}
- (CAShapeLayer *)buildCircularMaskingLayer
{
// Add a circular mask
UIBezierPath *path = [UIBezierPath
bezierPathWithRoundedRect:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height)
cornerRadius:0];
CGFloat verticalMargin = 8.0;
CGFloat radius = self.view.frame.size.height / 2.0f - verticalMargin;
// Center the circle's bounding rectangle
CGFloat horizontalMargin = (self.view.frame.size.width - 2.0f * radius) / 2.0f;
UIBezierPath *circlePath = [UIBezierPath
bezierPathWithRoundedRect:CGRectMake(horizontalMargin, verticalMargin, 2.0f * radius, 2.0f * radius)
cornerRadius:radius];
[path appendPath:circlePath];
[path setUsesEvenOddFillRule:YES];
CAShapeLayer *fillLayer = [CAShapeLayer layer];
fillLayer.path = path.CGPath;
fillLayer.fillRule = kCAFillRuleEvenOdd;
fillLayer.fillColor = [UIColor grayColor].CGColor;
fillLayer.opacity = 0.5;
return fillLayer;
}
- (void)captureResult:(ZXCapture *)capture result:(ZXResult *)result
{
if (!self.captureEnabled)
return;
[self stopCapture];
// TODO bounding rectangle
// Vibrate
AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
if (self.scanDelegate) {
if ([self.scanDelegate respondsToSelector:@selector(controller:didDetectQRCodeWithData:)]) {
DDLogInfo(@"%@ Scanned Data Code.", self.tag);
ZXByteArray *byteArray = result.resultMetadata[@(kResultMetadataTypeByteSegments)][0];
NSData *decodedData = [NSData dataWithBytes:byteArray.array length:byteArray.length];
[self.scanDelegate controller:self didDetectQRCodeWithData:decodedData];
}
if ([self.scanDelegate respondsToSelector:@selector(controller:didDetectQRCodeWithString:)]) {
DDLogInfo(@"%@ Scanned String Code.", self.tag);
[self.scanDelegate controller:self didDetectQRCodeWithString:result.text];
}
}
}
+ (NSString *)tag
{
return [NSString stringWithFormat:@"[%@]", self.class];
}
- (NSString *)tag
{
return self.class.tag;
}
@end