“摇一摇”功能的实现：
iPhone对 “摇一摇”有很好的支持，总体说来就两步：
在视图控制器中打开接受“摇一摇”的开关;
- (void)viewDidLoad {
// 设置允许摇一摇功能
[UIApplication sharedApplication].applicationSupportsShakeToEdit = YES;
// 并让自己成为第一响应者
[self becomeFirstResponder];
}
在“摇一摇”触发的制定的方法中实现需要实现的功能（”摇一摇“检测方法）。
// 摇一摇开始摇动
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event {
NSLog(@"开始摇动");
//添加“摇一摇”动画
[self addAnimations];
//音效
AudioServicesPlaySystemSound (soundID);
return;
}
// “摇一摇”取消摇动
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event {
NSLog(@"取消摇动");
return;
}
// “摇一摇”摇动结束
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event {
if (event.subtype == UIEventSubtypeMotionShake) { // 判断是否是摇动结束
NSLog(@"摇动结束");
}
return;
}
”摇一摇“的动画效果：
- (void)addAnimations {
//音效
AudioServicesPlaySystemSound (soundID);
//让上面图片的上下移动
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;
//让下面的图片上下移动
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：在模拟器中运行时，可以通过「Hardware」-「Shake Gesture」来测试「摇一摇」功能。如下:
“扫一扫”功能的实现：
基于AVCaptureDevice做的二维码扫描器，基本步骤如下：
