代码如下：
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import
UIKit
class
ViewController
:
UIViewController
{
override
func
viewDidLoad() {
super
.viewDidLoad()
let
qrcodeImg =
UIImage
(named:
"codeBg.png"
)
ciImage:
CIImage
=
CIImage
(image:qrcodeImg!)!
context =
CIContext
(options:
nil
)
detector:
CIDetector
(ofType:
CIDetectorTypeQRCode
,
context: context,options: [
CIDetectorAccuracy
CIDetectorAccuracyHigh
])
features=detector.featuresInImage(ciImage)
//遍历所有的二维码，并框出
for
feature
in
features
as
! [
CIQRCodeFeature
] {
(feature.messageString)
}
}
didReceiveMemoryWarning() {
.didReceiveMemoryWarning()
}
}
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控制台输出如下：
可以看到两个二维码都成功的读取到了。
（注：这个我原来用模拟器一直检测不到二维码，使用真机调试就没问题。
感谢网友“落叶”的提醒，模拟器选iphone5s及以上设备也是可以检测到的。）
2，从相册中选择图片读取二维码
3，使用摄像头扫描读取二维码
（1）扫描主要使用的是 AVFoundation，用起来方便简单
（2）通过 AVCaptureMetadataOutput的 rectOfInterest属性，可以设置探测探测区域。同时给这个探测区域添加个方框，只有在框中的二维码才会被扫描到。
效果图如下：
代码如下：
2，从相册中选择图片读取二维码
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import
UIKit
class
ViewController
:
UIViewController
UIImagePickerControllerDelegate
override
func
viewDidLoad() {
super
.viewDidLoad()
}
//选取相册
@IBAction
fromAlbum(sender:
AnyObject
) {
if
UIImagePickerController
.isSourceTypeAvailable(.
PhotoLibrary
){
//初始化图片控制器
let
picker =
UIImagePickerController
()
//设置代理
picker.delegate =
self
//指定图片控制器类型
picker.sourceType =
UIImagePickerControllerSourceType
.
PhotoLibrary
//弹出控制器，显示界面
self
.presentViewController(picker,animated:
true
() ->
Void
in
})
}
else
{
}
}
//选择图片成功后代理
imagePickerController(picker:
didFinishPickingMediaWithInfo info: [
String
:
]) {
//获取选择的原图
image = info[
UIImagePickerControllerOriginalImage
]
as
!
UIImage
//二维码读取
ciImage:
CIImage
=
CIImage
(image:image)!
context =
CIContext
(options:
nil
)
detector:
CIDetector
(ofType:
CIDetectorTypeQRCode
CIDetectorAccuracy
CIDetectorAccuracyHigh
])
features=detector.featuresInImage(ciImage)
"扫描到二维码个数：\(features.count)"
)
//遍历所有的二维码，并框出
for
feature
in
features
! [
CIQRCodeFeature
] {
(feature.messageString)
}
picker.dismissViewControllerAnimated(
() ->
Void
in
})
}
didReceiveMemoryWarning() {
.didReceiveMemoryWarning()
}
}
|
3，使用摄像头扫描读取二维码
（1）扫描主要使用的是 AVFoundation，用起来方便简单
（2）通过 AVCaptureMetadataOutput的 rectOfInterest属性，可以设置探测探测区域。同时给这个探测区域添加个方框，只有在框中的二维码才会被扫描到。
效果图如下：
代码如下：
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import
UIKit
AVFoundation
class
ViewController
:
UIViewController
AVCaptureMetadataOutputObjectsDelegate
var
scanRectView:
UIView
!
device:
AVCaptureDevice
!
input:
AVCaptureDeviceInput
!
output:
AVCaptureMetadataOutput
!
session:
AVCaptureSession
!
preview:
AVCaptureVideoPreviewLayer
!
override
func
viewDidLoad() {
super
.viewDidLoad()
}
//通过摄像头扫描
@IBAction
fromCamera(sender:
AnyObject
) {
do{
self
.device =
AVCaptureDevice
.defaultDeviceWithMediaType(
AVMediaTypeVideo
)
.input = try
(device: device)
.output =
AVCaptureMetadataOutput
()
output.setMetadataObjectsDelegate(
.session =
()
if
UIScreen
.mainScreen().bounds.size.height<500 {
.session.sessionPreset =
AVCaptureSessionPreset640x480
}
else
{
AVCaptureSessionPresetHigh
}
.session.addInput(
.input)
.session.addOutput(
.output)
//计算中间可探测区域
let
windowSize:
CGSize
=
.mainScreen().bounds.size;
scanSize:
CGSizeMake
(windowSize.width*3/4,
windowSize.width*3/4);
scanRect:
CGRect
=
CGRectMake
((windowSize.width-scanSize.width)/2,
(windowSize.height-scanSize.height)/2,scanSize.width,scanSize.height);
//计算rectOfInterest 注意x,y交换位置
scanRect =
(scanRect.origin.y/windowSize.height,
scanRect.origin.x/windowSize.width,
scanRect.size.height/windowSize.height,
scanRect.size.width/windowSize.width);
//设置可探测区域
.output.rectOfInterest = scanRect
.preview =
AVCaptureVideoPreviewLayer
(session:
.session)
.preview.videoGravity =
AVLayerVideoGravityResizeAspectFill
.preview.frame =
.mainScreen().bounds
.view.layer.insertSublayer(
.preview,atIndex:0)
//添加中间的探测区域绿框
.scanRectView =
UIView
();
.view.addSubview(
.scanRectView)
.scanRectView.frame =
CGRectMake
(0,scanSize.height);
.scanRectView.center =
CGPointMake
(
CGRectGetMidX
(
UIScreen
.mainScreen().bounds),
CGRectGetMidY
.mainScreen().bounds));
.scanRectView.layer.borderColor =
UIColor
.greenColor().
CGColor
.scanRectView.layer.borderWidth = 1;
//开始捕获
.session.startRunning()
}catch _
as
NSError
{
//打印错误消息
errorAlert =
UIAlertView
(title:
"提醒"
message:
"请在iPhone的\"设置-隐私-相机\"选项中,允许本程序访问您的相机"
delegate:
cancelButtonTitle:
"确定"
)
errorAlert.show()
}
}
//摄像头捕获
captureOutput(captureOutput:
AVCaptureOutput
!,
fromConnection connection:
AVCaptureConnection
!) {
stringValue:
String
?
if
MetadataObjects.count > 0 {
stringValue = MetadataObject.stringValue
stringValue !=
nil
{
.session.stopRunning()
}
}
.session.stopRunning()
//输出结果
alertView.show()
}
//消息框确认后消失
alertView(alertView:
Int
) {
//继续扫描
.session.startRunning()
}
didReceiveMemoryWarning() {
.didReceiveMemoryWarning()
}
}
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原文出自： www.hangge.com 转载请保留原文链接： http://www.hangge.com/blog/cache/detail_915.html 原文链接：https://www.f2er.com/swift/324448.html
