还有就是设置内容为网址时，如果带有协议头的话，会自动打开网页。
NSString *str = @http://www.easck.com/pre>
必须带有协议头才能打开
回到顶部
扫描二维码
AVFoundation框架
二维码的扫描过程
1、创建捕捉会话AVCaptureSession
添加输入设备(数据从摄像头输入) AVCaptureDevice AVCaptureDeviceInput
2、添加输出数据(示例对象-->类对象-->元类对象-->根元类对象) AVCaptureMetadataOutput
2.1.设置输入元数据的类型(类型是二维码数据) setMetadataObjectTypes
3、添加扫描图层 AVCaptureVideoPreviewLayer
4、开始扫描 startRunning
5、实现回调代理方法，获取扫描结果 captureOutput: :
#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface ViewController () <AVCaptureMetadataOutputObjectsDelegate>
/**显示图层*/
@property (nonatomic, strong) AVCaptureVideoPreviewLayer *layer;
/**捕捉会话*/
@property (nonatomic, strong) AVCaptureSession *session;
@end
@implementation ViewController
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
// 二维码的扫描
// 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];
}
/**
* 实现output的回调方法
*/
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
// 数组metadataObjects中存放结果数据
if (metadataObjects.count > 0) {
// 获取最终的读取结果
AVMetadataMachineReadableCodeObject *object = [metadataObjects lastObject];
NSLog(@"%@",object.stringValue);
[self.session stopRunning];
[self.layer removeFromSuperlayer];
}
else
{
NSLog(@"没有扫描到数据");
}
}
