使用系统自带生成/扫描二维码
iOS7开始苹果集成了二维码的生成的扫描 ### 生成二维码的步骤
导入CoreImage框架 #import <CoreImage/CoreImage.h>
通过滤镜CIFilte生成二维码 ### 二维码的内容(传统的条形码只能放数字)
纯文本
名片
URL
生成二维码
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
|
// 1.创建过滤器
CIFilter *filter = [CIFilter filterWithName:@ "CIQRCodeGenerator" ];
// 2.恢复默认
[filter setDefaults];
// 3.给过滤器添加数据(正则表达式/账号和密码)
NSString *dataString = @ "http://www.zzvips.com" ;
NSData *data = [dataString dataUsingEncoding:NSUTF8StringEncoding];
[filter setValue:data forKeyPath:@ "inputMessage" ];
// 4.获取输出的二维码
CIImage *outputImage = [filter outputImage];
//因为生成的二维码模糊,所以通过createNonInterpolatedUIImageFormCIImage:outputImage来获得高清的二维码图片
// 5.显示二维码
self.imageView.image = [self createNonInterpolatedUIImageFormCIImage:outputImage withSize:300];
/**
* 根据CIImage生成指定大小的UIImage
*
* @param image CIImage
* @param size 图片宽度
*/
- (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size
{
CGRect extent = CGRectIntegral(image.extent);
CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
// 1.创建bitmap;
size_t width = CGRectGetWidth(extent) * scale;
size_t height = CGRectGetHeight(extent) * scale;
CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();
CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];
CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
CGContextScaleCTM(bitmapRef, scale, scale);
CGContextDrawImage(bitmapRef, extent, bitmapImage);
// 2.保存bitmap到图片
CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
CGContextRelease(bitmapRef);
CGImageRelease(bitmapImage);
return [UIImage imageWithCGImage:scaledImage];
}
|
扫描二维码
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
|
// 1.创建捕捉会话
AVCaptureSession *session = [[AVCaptureSession alloc] init];
self.session = session;
// 2.添加输入设备(数据从摄像头输入)
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
[session addInput:input];
// 3.添加输出数据(示例对象-->类对象-->元类对象-->根元类对象)
AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
[session addOutput:output];
// 3.1.设置输入元数据的类型(类型是二维码数据)
[output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]];
// 4.添加扫描图层
AVCaptureVideoPreviewLayer *layer = [AVCaptureVideoPreviewLayer layerWithSession:session];
layer.frame = self.view.bounds;
[self.view.layer addSublayer:layer];
self.layer = layer;
// 5.开始扫描
[session startRunning];
|
扫描会调用的方法
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
|
// 当扫描到数据时就会执行该方法
- ( void )captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
if (metadataObjects.count > 0 ) {
//获得扫描数据,最后一个时最新扫描的数据
AVMetadataMachineReadableCodeObject *object = [metadataObjects lastObject];
NSLog(@ "%@" , object.stringValue);
// 停止扫描
[self.session stopRunning];
// 将预览图层移除
[self.layer removeFromSuperlayer];
} else {
NSLog(@ "没有扫描到数据" );
}
}
|
以上就是对IOS 二维码的资料整理,后续继续补充相关资料,谢谢大家对本站的支持!