mirror of
https://github.com/simplezhli/flutter_barcode_reader.git
synced 2024-11-15 13:39:22 +08:00
102 lines
3.5 KiB
Objective-C
102 lines
3.5 KiB
Objective-C
#import "ScannerOverlay.h"
|
|
|
|
@interface ScannerOverlay()
|
|
@property(nonatomic, retain) UIView *line;
|
|
@end
|
|
|
|
@implementation ScannerOverlay
|
|
|
|
- (instancetype)initWithFrame:(CGRect)frame
|
|
{
|
|
self = [super initWithFrame:frame];
|
|
if (self) {
|
|
_line = [[UIView alloc] init];
|
|
_line.backgroundColor = UIColor.redColor;
|
|
_line.translatesAutoresizingMaskIntoConstraints = NO;
|
|
[self addSubview:_line];
|
|
}
|
|
return self;
|
|
}
|
|
|
|
- (void)drawRect:(CGRect)rect {
|
|
CGContextRef context = UIGraphicsGetCurrentContext();
|
|
|
|
UIColor * overlayColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.55];
|
|
UIColor *scanLineColor = UIColor.redColor;
|
|
|
|
CGContextSetFillColorWithColor(context, overlayColor.CGColor);
|
|
CGContextFillRect(context, self.bounds);
|
|
|
|
// make a hole for the scanner
|
|
CGRect holeRect = [self scanRect];
|
|
CGRect holeRectIntersection = CGRectIntersection( holeRect, rect );
|
|
[[UIColor clearColor] setFill];
|
|
UIRectFill(holeRectIntersection);
|
|
|
|
// draw a horizontal line over the middle
|
|
CGRect lineRect = [self scanLineRect];
|
|
_line.frame = lineRect;
|
|
|
|
// drw the green corners
|
|
CGFloat cornerSize = 30;
|
|
UIBezierPath *path = [UIBezierPath bezierPath];
|
|
//top left corner
|
|
[path moveToPoint:CGPointMake(holeRect.origin.x, holeRect.origin.y + cornerSize)];
|
|
[path addLineToPoint:CGPointMake(holeRect.origin.x, holeRect.origin.y)];
|
|
[path addLineToPoint:CGPointMake(holeRect.origin.x + cornerSize, holeRect.origin.y)];
|
|
|
|
//top right corner
|
|
CGFloat rightHoleX = holeRect.origin.x + holeRect.size.width;
|
|
[path moveToPoint:CGPointMake(rightHoleX - cornerSize, holeRect.origin.y)];
|
|
[path addLineToPoint:CGPointMake(rightHoleX, holeRect.origin.y)];
|
|
[path addLineToPoint:CGPointMake(rightHoleX, holeRect.origin.y + cornerSize)];
|
|
|
|
// bottom right corner
|
|
CGFloat bottomHoleY = holeRect.origin.y + holeRect.size.height;
|
|
[path moveToPoint:CGPointMake(rightHoleX, bottomHoleY - cornerSize)];
|
|
[path addLineToPoint:CGPointMake(rightHoleX, bottomHoleY)];
|
|
[path addLineToPoint:CGPointMake(rightHoleX - cornerSize, bottomHoleY)];
|
|
|
|
// bottom left corner
|
|
[path moveToPoint:CGPointMake(holeRect.origin.x + cornerSize, bottomHoleY)];
|
|
[path addLineToPoint:CGPointMake(holeRect.origin.x, bottomHoleY)];
|
|
[path addLineToPoint:CGPointMake(holeRect.origin.x, bottomHoleY - cornerSize)];
|
|
|
|
path.lineWidth = 2;
|
|
[[UIColor greenColor] setStroke];
|
|
[path stroke];
|
|
|
|
}
|
|
|
|
- (void)startAnimating {
|
|
CABasicAnimation *flash = [CABasicAnimation animationWithKeyPath:@"opacity"];
|
|
flash.fromValue = [NSNumber numberWithFloat:0.0];
|
|
flash.toValue = [NSNumber numberWithFloat:1.0];
|
|
flash.duration = 0.25;
|
|
flash.autoreverses = YES;
|
|
flash.repeatCount = HUGE_VALF;
|
|
[_line.layer addAnimation:flash forKey:@"flashAnimation"];
|
|
}
|
|
|
|
- (void)stopAnimating {
|
|
[self.layer removeAnimationForKey:@"flashAnimation"];
|
|
}
|
|
|
|
- (CGRect)scanRect {
|
|
CGRect rect = self.frame;
|
|
CGFloat heightMultiplier = 3.0/4.0; // 4:3 aspect ratio
|
|
CGFloat scanRectWidth = rect.size.width * 0.8f;
|
|
CGFloat scanRectHeight = scanRectWidth * heightMultiplier;
|
|
CGFloat scanRectOriginX = (rect.size.width / 2) - (scanRectWidth / 2);
|
|
CGFloat scanRectOriginY = (rect.size.height / 2) - (scanRectHeight / 2);
|
|
return CGRectMake(scanRectOriginX, scanRectOriginY, scanRectWidth, scanRectHeight);
|
|
}
|
|
|
|
- (CGRect)scanLineRect {
|
|
CGRect scanRect = [self scanRect];
|
|
CGRect rect = self.frame;
|
|
return CGRectMake(scanRect.origin.x, rect.size.height / 2, scanRect.size.width, 1);
|
|
}
|
|
|
|
@end
|