forked from nenosinc/RMScannerView
-
Notifications
You must be signed in to change notification settings - Fork 0
/
RMScannerView.m
441 lines (342 loc) · 16.4 KB
/
RMScannerView.m
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
//
// RMScannerView.m
// RMScannerView
//
// Created by iRare Media on 12/3/13.
// Copyright (c) 2014 iRare Media. All rights reserved.
//
#import "RMScannerView.h"
@interface RMScannerView () {
AVCaptureDeviceInput *videoInput;
AVCaptureMetadataOutput *metadataOutput;
AVCaptureVideoPreviewLayer *previewLayer;
UIView *laserView;
RMOutlineBox *boundingBox;
}
- (void)initialize;
- (void)setupMetadataOutput;
- (void)breakdownMetadataOutput;
- (void)setupPreviewLayer;
- (void)setupCameraFocus;
- (void)stopCameraFlash;
@end
@implementation RMScannerView
@synthesize delegate, verboseLogging, animateScanner, displayCodeOutline;
#pragma mark - Initialize
- (void)initialize {
self.captureSession = [[AVCaptureSession alloc] init];
}
- (id)initWithCoder:(NSCoder *)aDecoder {
self = [super initWithCoder:aDecoder];
if (self) {
[self initialize];
}
return self;
}
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
[self initialize];
}
return self;
}
- (void)dealloc {
// Stop Running the Capture Session
[self.captureSession stopRunning];
// Remove all Inputs
for (AVCaptureInput *input in self.captureSession.inputs) {
[self.captureSession removeInput:input];
}
// Remove all Outputs
for (AVCaptureOutput *output in self.captureSession.outputs) {
[self.captureSession removeOutput:output];
}
// Remove preview layer
[previewLayer removeFromSuperlayer];
// Set objects to nil
self.captureSession = nil;
metadataOutput = nil;
videoInput = nil;
previewLayer = nil;
}
#pragma mark - Scanner Checks
- (BOOL)isScanSessionInProgress {
if ([self.captureSession isRunning] == YES) {
if ([self.captureSession.outputs containsObject:metadataOutput] == YES) return YES;
else return NO;
} else {
return NO;
}
}
- (BOOL)isCaptureSessionInProgress {
if ([self.captureSession isRunning] == YES) return YES;
else return NO;
}
#pragma mark - Setup and Breakdown
- (void)startCaptureSession {
// Log capture session start
if (verboseLogging) NSLog(@"[RMScannerView] Starting Capture Session...");
NSError *error = nil;
AVCaptureDevice *videoCaptureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
videoInput = [AVCaptureDeviceInput deviceInputWithDevice:videoCaptureDevice error:&error];
// Log video check
if (verboseLogging) NSLog(@"[RMScannerView] Checking for video input...");
if (videoInput) {
// Log video input
if (verboseLogging) NSLog(@"[RMScannerView] Valid video input");
// Get the video feed from the camera and add it as an input - as long as we're not already getting a feed
if ([self.captureSession.inputs containsObject:videoInput] == NO) [self.captureSession addInput:videoInput];
// Log metadata setup
if (verboseLogging) NSLog(@"[RMScannerView] Setting up metadata output...");
// Start the metadata output
[self setupMetadataOutput];
// Log preview layer creation
if (verboseLogging) NSLog(@"[RMScannerView] Creating the preview layer...");
// Create the preview layer
[self setupPreviewLayer];
// Setup Camera Focus
[self setupCameraFocus];
// Check if the capture session is already running, if it is don't start it again
if ([self.captureSession isRunning] == NO) [self.captureSession startRunning];
// Log capture session
if (verboseLogging) NSLog(@"[RMScannerView] Started Capture Session");
// Start Scan
[self startScanSession];
} else {
NSLog(@"[RMScannerView] Invalid video input. There is no video input, or the scanner was not able to obtain input.");
NSLog(@"[RMScannerView] %@", error);
if ([self.delegate respondsToSelector:@selector(errorGeneratingCaptureSession:)])
[self.delegate errorGeneratingCaptureSession:error];
}
}
- (void)stopCaptureSession {
// Stop the scan session
[self stopScanSession];
// Remove the box
[UIView animateWithDuration:0.2 animations:^{
boundingBox.alpha = 0.0;
}];
// Stop the capture session
[self.captureSession stopRunning];
// Log the stop
if (verboseLogging) NSLog(@"[RMScannerView] Stopped capture session");
}
- (void)startScanSession {
if (verboseLogging) NSLog(@"[RMScannerView] Starting Scan Session...");
if (([self isCaptureSessionInProgress] == YES) && ([self isScanSessionInProgress] == NO)) {
if (verboseLogging) NSLog(@"[RMScannerView] Capture session is in progress, but not a scan session. Begginning scan session...");
// Add the metadata output to the session - there is a running capture session, but no scan session
[self setupMetadataOutput];
if (verboseLogging) NSLog(@"[RMScannerView] Scan session started");
} else if ([self isCaptureSessionInProgress] == NO) {
if (verboseLogging) NSLog(@"[RMScannerView] Capture session not in progress, starting new session");
// The capture session may not be running, start it
[self startCaptureSession];
}
// Begin the capture session animations
if (animateScanner) {
// Add the view to draw the bounding box for the UIView
boundingBox = [[RMOutlineBox alloc] initWithFrame:self.bounds];
boundingBox.alpha = 0.0;
[self addSubview:boundingBox];
if (!laserView) laserView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, 2)];
laserView.backgroundColor = [UIColor redColor];
laserView.layer.shadowColor = [UIColor redColor].CGColor;
laserView.layer.shadowOffset = CGSizeMake(0.5, 0.5);
laserView.layer.shadowOpacity = 0.6;
laserView.layer.shadowRadius = 1.5;
laserView.alpha = 0.0;
if (![[self subviews] containsObject:laserView]) [self addSubview:laserView];
// Add the line
[UIView animateWithDuration:0.2 animations:^{
laserView.alpha = 1.0;
}];
[UIView animateWithDuration:4.0 delay:0.0 options:UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat | UIViewAnimationOptionCurveEaseInOut animations:^{
laserView.frame = CGRectMake(0, self.frame.size.height, self.frame.size.width, 2);
} completion:nil];
}
}
- (void)stopScanSession {
// Remove the line
[UIView animateWithDuration:0.2 animations:^{
laserView.alpha = 0.0;
}];
// Breakdown the metadata output
[self breakdownMetadataOutput];
// Stop the camera flash
[self stopCameraFlash];
// Log the stop
if (verboseLogging) NSLog(@"[RMScannerView] Stopped scan session");
}
- (void)setupMetadataOutput {
// Log the metadata object
if (verboseLogging) NSLog(@"[RMScannerView] Creating metadata object");
if (metadataOutput == nil) metadataOutput = [[AVCaptureMetadataOutput alloc] init]; // Setup the metadata object if it doesn't already exist
if ([self.captureSession.outputs containsObject:metadataOutput] == NO) [self.captureSession addOutput:metadataOutput]; // Add the metadata object if it hasn't been added
[metadataOutput setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
[metadataOutput setMetadataObjectTypes:@[AVMetadataObjectTypeAztecCode, AVMetadataObjectTypeCode128Code, AVMetadataObjectTypeCode39Code, AVMetadataObjectTypeCode39Mod43Code, AVMetadataObjectTypeCode93Code, AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypePDF417Code, AVMetadataObjectTypeQRCode, AVMetadataObjectTypeUPCECode]];
}
- (void)breakdownMetadataOutput {
// Log the breakdown
if (verboseLogging) NSLog(@"[RMScannerView] Breaking down metadata output");
// Remove the metadata output from the capture session
if ([self.captureSession.outputs containsObject:metadataOutput] == YES) [self.captureSession removeOutput:metadataOutput];
}
- (void)setupPreviewLayer {
// Log the creation of the preview layer
if (verboseLogging) NSLog(@"[RMScannerView] Creating the preview layer");
// Create the preview layer to display the video on
if (previewLayer == nil) previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.captureSession];
previewLayer.frame = self.layer.bounds;
previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
previewLayer.position = CGPointMake(CGRectGetMidX(self.layer.bounds), CGRectGetMidY(self.layer.bounds));
if ([self.layer.sublayers containsObject:previewLayer] == NO) [self.layer addSublayer:previewLayer];
}
#pragma mark - Camera Focus
- (void)setupCameraFocus {
// Grab the current device from the current capture session
AVCaptureDevice *device = videoInput.device;
// Check if auto focus is supported
if (![device isFocusPointOfInterestSupported] && ![device isFocusModeSupported:AVCaptureFocusModeAutoFocus]) return;
// Create the error object
NSError *error;
// Lock the hardware configuration to prevent other apps from changing the configuration
if ([device lockForConfiguration:&error]) {
// Auto-focus the camera
[device setFocusMode:AVCaptureFocusModeAutoFocus];
// Unlock the hardware configuration
[device unlockForConfiguration];
} else {
NSLog(@"[RMScannerView] %@", error);
if ([[self delegate] respondsToSelector:@selector(errorAcquiringDeviceHardwareLock:)])
[[self delegate] errorAcquiringDeviceHardwareLock:error];
}
}
#pragma mark - Camera Flash
- (void)setDeviceFlash:(AVCaptureFlashMode)flashMode {
// Grab the current device from the current capture session
AVCaptureDevice *device = videoInput.device;
// Check if flash is supported
if (![device isFlashAvailable] && ![device isFlashModeSupported:flashMode]) return;
// Create the error object
NSError *error;
// Lock the hardware configuration to prevent other apps from changing the configuration
if ([device lockForConfiguration:&error]) {
// Set the camera flash
[device setFlashMode:flashMode];
// Unlock the hardware configuration
[device unlockForConfiguration];
} else {
NSLog(@"[RMScannerView] %@", error);
if ([[self delegate] respondsToSelector:@selector(errorAcquiringDeviceHardwareLock:)])
[[self delegate] errorAcquiringDeviceHardwareLock:error];
}
}
- (void)stopCameraFlash {
// Grab the current device from the current capture session
AVCaptureDevice *device = videoInput.device;
// Check if flash is supported
if (![device isFlashAvailable] && ![device isFlashActive]) return;
// Create the error object
NSError *error;
// Lock the hardware configuration to prevent other apps from changing the configuration
if ([device lockForConfiguration:&error]) {
// Set the camera flash
[device setFlashMode:AVCaptureFlashModeOff];
// Unlock the hardware configuration
[device unlockForConfiguration];
} else {
NSLog(@"[RMScannerView] %@", error);
if ([[self delegate] respondsToSelector:@selector(errorAcquiringDeviceHardwareLock:)])
[[self delegate] errorAcquiringDeviceHardwareLock:error];
}
}
#pragma mark - Touch Gestures
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
// Get the point that the user touched at
UITouch *touch = [touches anyObject];
CGPoint touchPoint = [touch locationInView:self];
// Grab the current device from the current capture session
AVCaptureDevice *device = videoInput.device;
// Check if auto focus is supported
if (![device isFocusPointOfInterestSupported] && ![device isFocusModeSupported:AVCaptureFocusModeAutoFocus]) return;
// Create the error object
NSError *error;
// Lock the hardware configuration to prevent other apps from changing the configuration
if ([device lockForConfiguration:&error]) {
// Auto-focus the camera to the point the user touched
[device setFocusPointOfInterest:touchPoint];
[device setFocusMode:AVCaptureFocusModeAutoFocus];
// Unlock the hardware configuration
[device unlockForConfiguration];
} else {
NSLog(@"[RMScannerView] %@", error);
if ([[self delegate] respondsToSelector:@selector(errorAcquiringDeviceHardwareLock:)])
[[self delegate] errorAcquiringDeviceHardwareLock:error];
}
}
#pragma mark - Output handling
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {
// A barcode was scanned, report the scan
for (AVMetadataObject *metadataObject in metadataObjects) {
// Log the object
if (verboseLogging) NSLog(@"[RMScannerView] Scanned metadata object: %@", metadataObject);
// Get the AVMetadataMachineReadableCodeObject
AVMetadataMachineReadableCodeObject *readableObject = (AVMetadataMachineReadableCodeObject *)metadataObject;
AVMetadataMachineReadableCodeObject *transformedObject = (AVMetadataMachineReadableCodeObject *)[previewLayer transformedMetadataObjectForMetadataObject:metadataObject];
// Call the delegate to report the scan
if ([self.delegate respondsToSelector:@selector(didScanCode:onCodeType:)])
[self.delegate didScanCode:readableObject.stringValue onCodeType:readableObject.type];
// Call the delegate to check if scanning is continuous or if it should be stopped after the first scan
if ([self.delegate respondsToSelector:@selector(shouldEndSessionAfterFirstSuccessfulScan)]) {
BOOL shouldEndSession = [self.delegate shouldEndSessionAfterFirstSuccessfulScan];
if (shouldEndSession == YES) {
[self stopScanSession];
} else {
if (displayCodeOutline) {
// Update the frame on the boundingBox view, and show it
[UIView animateWithDuration:0.2 animations:^{
laserView.alpha = 0.0;
boundingBox.frame = transformedObject.bounds;
boundingBox.alpha = 1.0;
boundingBox.corners = [self translatePoints:transformedObject.corners fromView:self toView:boundingBox];
}];
[UIView animateWithDuration:0.5 delay:2.0 options:UIViewAnimationOptionCurveEaseOut animations:^{
laserView.alpha = 1.0;
boundingBox.alpha = 0.0;
} completion:nil];
}
continue;
}
} else {
[self stopScanSession];
}
}
}
- (NSString *)humanReadableCodeTypeForCode:(NSString *)codeType {
if (codeType == AVMetadataObjectTypeAztecCode) return @"Aztec";
if (codeType == AVMetadataObjectTypeCode128Code) return @"Code 128";
if (codeType == AVMetadataObjectTypeCode39Code) return @"Code 39";
if (codeType == AVMetadataObjectTypeCode39Mod43Code) return @"Code 39 Mod 43";
if (codeType == AVMetadataObjectTypeCode93Code) return @"Code 93";
if (codeType == AVMetadataObjectTypeEAN13Code) return @"EAN13";
if (codeType == AVMetadataObjectTypeEAN8Code) return @"EAN8";
if (codeType == AVMetadataObjectTypePDF417Code) return @"PDF417";
if (codeType == AVMetadataObjectTypeQRCode) return @"QR";
if (codeType == AVMetadataObjectTypeUPCECode) return @"UPCE";
return nil;
}
- (NSArray *)translatePoints:(NSArray *)points fromView:(UIView *)fromView toView:(UIView *)toView {
NSMutableArray *translatedPoints = [NSMutableArray new];
// The points are provided in a dictionary with keys X and Y
for (NSDictionary *point in points) {
// Let's turn them into CGPoints
CGPoint pointValue = CGPointMake([point[@"X"] floatValue], [point[@"Y"] floatValue]);
// Now translate from one view to the other
CGPoint translatedPoint = [fromView convertPoint:pointValue toView:toView];
// Box them up and add to the array
[translatedPoints addObject:[NSValue valueWithCGPoint:translatedPoint]];
}
return [translatedPoints copy];
}
@end