mirror of
https://github.com/simplezhli/flutter_barcode_reader.git
synced 2024-11-26 08:49:19 +08:00
102 lines
3.5 KiB
Objective-C
102 lines
3.5 KiB
Objective-C
#import "ScannerOverlay.h"
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@interface ScannerOverlay()
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@property(nonatomic, retain) UIView *line;
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@end
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@implementation ScannerOverlay
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- (instancetype)initWithFrame:(CGRect)frame
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{
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self = [super initWithFrame:frame];
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if (self) {
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_line = [[UIView alloc] init];
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_line.backgroundColor = UIColor.redColor;
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_line.translatesAutoresizingMaskIntoConstraints = NO;
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[self addSubview:_line];
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}
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return self;
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}
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- (void)drawRect:(CGRect)rect {
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CGContextRef context = UIGraphicsGetCurrentContext();
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UIColor * overlayColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.55];
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UIColor *scanLineColor = UIColor.redColor;
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CGContextSetFillColorWithColor(context, overlayColor.CGColor);
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CGContextFillRect(context, self.bounds);
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// make a hole for the scanner
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CGRect holeRect = [self scanRect];
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CGRect holeRectIntersection = CGRectIntersection( holeRect, rect );
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[[UIColor clearColor] setFill];
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UIRectFill(holeRectIntersection);
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// draw a horizontal line over the middle
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CGRect lineRect = [self scanLineRect];
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_line.frame = lineRect;
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// drw the green corners
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CGFloat cornerSize = 30;
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UIBezierPath *path = [UIBezierPath bezierPath];
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//top left corner
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[path moveToPoint:CGPointMake(holeRect.origin.x, holeRect.origin.y + cornerSize)];
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[path addLineToPoint:CGPointMake(holeRect.origin.x, holeRect.origin.y)];
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[path addLineToPoint:CGPointMake(holeRect.origin.x + cornerSize, holeRect.origin.y)];
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//top right corner
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CGFloat rightHoleX = holeRect.origin.x + holeRect.size.width;
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[path moveToPoint:CGPointMake(rightHoleX - cornerSize, holeRect.origin.y)];
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[path addLineToPoint:CGPointMake(rightHoleX, holeRect.origin.y)];
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[path addLineToPoint:CGPointMake(rightHoleX, holeRect.origin.y + cornerSize)];
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// bottom right corner
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CGFloat bottomHoleY = holeRect.origin.y + holeRect.size.height;
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[path moveToPoint:CGPointMake(rightHoleX, bottomHoleY - cornerSize)];
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[path addLineToPoint:CGPointMake(rightHoleX, bottomHoleY)];
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[path addLineToPoint:CGPointMake(rightHoleX - cornerSize, bottomHoleY)];
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// bottom left corner
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[path moveToPoint:CGPointMake(holeRect.origin.x + cornerSize, bottomHoleY)];
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[path addLineToPoint:CGPointMake(holeRect.origin.x, bottomHoleY)];
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[path addLineToPoint:CGPointMake(holeRect.origin.x, bottomHoleY - cornerSize)];
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path.lineWidth = 2;
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[[UIColor greenColor] setStroke];
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[path stroke];
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}
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- (void)startAnimating {
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CABasicAnimation *flash = [CABasicAnimation animationWithKeyPath:@"opacity"];
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flash.fromValue = [NSNumber numberWithFloat:0.0];
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flash.toValue = [NSNumber numberWithFloat:1.0];
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flash.duration = 0.25;
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flash.autoreverses = YES;
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flash.repeatCount = HUGE_VALF;
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[_line.layer addAnimation:flash forKey:@"flashAnimation"];
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}
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- (void)stopAnimating {
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[self.layer removeAnimationForKey:@"flashAnimation"];
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}
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- (CGRect)scanRect {
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CGRect rect = self.frame;
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CGFloat heightMultiplier = 3.0/4.0; // 4:3 aspect ratio
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CGFloat scanRectWidth = rect.size.width * 0.8f;
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CGFloat scanRectHeight = scanRectWidth * heightMultiplier;
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CGFloat scanRectOriginX = (rect.size.width / 2) - (scanRectWidth / 2);
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CGFloat scanRectOriginY = (rect.size.height / 2) - (scanRectHeight / 2);
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return CGRectMake(scanRectOriginX, scanRectOriginY, scanRectWidth, scanRectHeight);
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}
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- (CGRect)scanLineRect {
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CGRect scanRect = [self scanRect];
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CGRect rect = self.frame;
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return CGRectMake(scanRect.origin.x, rect.size.height / 2, scanRect.size.width, 1);
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}
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@end
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