本篇文章主要介紹了iOS實現(xiàn)“搖一搖”與“掃一掃”功能示例代碼;有需要的朋友可以作為參考下：
“搖一搖”功能的實現(xiàn)：
iPhone對 “搖一搖”有很好的支持，總體說來就兩步：
在視圖控制器中打開接受“搖一搖”的開關(guān);
- (void)viewDidLoad {
// 設(shè)置允許搖一搖功能
[UIApplication sharedApplication].applicationSupportsShakeToEdit = YES;
// 并讓自己成為第一響應(yīng)者
[self becomeFirstResponder];
}
在“搖一搖”觸發(fā)的制定的方法中實現(xiàn)需要實現(xiàn)的功能（”搖一搖“檢測方法）。
// 搖一搖開始搖動
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event {
NSLog(@"開始搖動");
//添加“搖一搖”動畫
[self addAnimations];
//音效
AudioServicesPlaySystemSound (soundID);
return;
}
// “搖一搖”取消搖動
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event {
NSLog(@"取消搖動");
return;
}
// “搖一搖”搖動結(jié)束
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event {
if (event.subtype == UIEventSubtypeMotionShake) { // 判斷是否是搖動結(jié)束
NSLog(@"搖動結(jié)束");
}
return;
}
”搖一搖“的動畫效果：
- (void)addAnimations {
//音效
AudioServicesPlaySystemSound (soundID);
//讓上面圖片的上下移動
CABasicAnimation *translation2 = [CABasicAnimation animationWithKeyPath:@"position"];
translation2.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
translation2.fromValue = [NSValue valueWithCGPoint:CGPointMake(160, 115)];
translation2.toValue = [NSValue valueWithCGPoint:CGPointMake(160, 40)];
translation2.duration = 0.4;
translation2.repeatCount = 1;
translation2.autoreverses = YES;
//讓下面的圖片上下移動
CABasicAnimation *translation = [CABasicAnimation animationWithKeyPath:@"position"];
translation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
translation.fromValue = [NSValue valueWithCGPoint:CGPointMake(160, 345)];
translation.toValue = [NSValue valueWithCGPoint:CGPointMake(160, 420)];
translation.duration = 0.4;
translation.repeatCount = 1;
translation.autoreverses = YES;
[imgDown.layer addAnimation:translation forKey:@"translation"];
[imgUp.layer addAnimation:translation2 forKey:@"translation2"];
}
注意：在模擬器中運行時，可以通過「Hardware」-「Shake Gesture」來測試「搖一搖」功能。如下:
“掃一掃”功能的實現(xiàn)：
基于AVCaptureDevice做的二維碼掃描器，基本步驟如下：
初始化相機，生成掃描器
設(shè)置參數(shù)
- (void)setupCamera {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
_input = [AVCaptureDeviceInput deviceInputWithDevice:_device error:nil];
_output = [[AVCaptureMetadataOutput alloc]init];
[_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
_session = [[AVCaptureSession alloc]init];
[_session setSessionPreset:AVCaptureSessionPresetHigh];
if ([_session canAddInput:self.input])
{
[_session addInput:self.input];
}
if ([_session canAddOutput:self.output])
{
[_session addOutput:self.output];
}
// 條碼類型 AVMetadataObjectTypeQRCode
_output.metadataObjectTypes = [NSArray arrayWithObjects:AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code, AVMetadataObjectTypeQRCode, nil];
dispatch_async(dispatch_get_main_queue(), ^{
//更新界面
_preview =[AVCaptureVideoPreviewLayer layerWithSession:self.session];
_preview.videoGravity = AVLayerVideoGravityResizeAspectFill;
_preview.frame = CGRectMake(0, 0, CGRectGetWidth(self.centerView.frame), CGRectGetHeight(self.centerView.frame));
[self.centerView.layer insertSublayer:self.preview atIndex:0];
[_session startRunning];
});
});
}
處理掃描結(jié)果：
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {
NSString *stringValue;
if ([metadataObjects count] >0){
AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];
stringValue = metadataObject.stringValue;
NSLog(@"%@",stringValue);
}
[_session stopRunning];
[timer invalidate];
_count ++ ;
[self stopReading];
if (stringValue && _count == 1)
{//掃描完成}
}
用二維碼掃描器掃描自己的二維碼：
NSString *url = [NSURL URLWithString:@"html/judgement.html" relativeToURL:[ZXApiClient sharedClient].baseURL].absoluteString;
if ([stringValue hasPrefix:url]) {
//如果掃出來的url是自己的域名開頭的，那么做如下的處理
}
