当有人摇晃iPhone时,我想做出反应。我并不特别在意他们是如何摇晃它的,只在意它在一瞬间被使劲地挥舞着。有人知道怎么检测吗?
当前回答
在swift 5中,这就是如何捕捉运动并进行检查
override func motionEnded(_ motion: UIEventSubtype, with event: UIEvent?) {
if motion == .motionShake
{
print("shaking")
}
}
其他回答
在我的Diceshaker应用中:
// Ensures the shake is strong enough on at least two axes before declaring it a shake.
// "Strong enough" means "greater than a client-supplied threshold" in G's.
static BOOL L0AccelerationIsShaking(UIAcceleration* last, UIAcceleration* current, double threshold) {
double
deltaX = fabs(last.x - current.x),
deltaY = fabs(last.y - current.y),
deltaZ = fabs(last.z - current.z);
return
(deltaX > threshold && deltaY > threshold) ||
(deltaX > threshold && deltaZ > threshold) ||
(deltaY > threshold && deltaZ > threshold);
}
@interface L0AppDelegate : NSObject <UIApplicationDelegate> {
BOOL histeresisExcited;
UIAcceleration* lastAcceleration;
}
@property(retain) UIAcceleration* lastAcceleration;
@end
@implementation L0AppDelegate
- (void)applicationDidFinishLaunching:(UIApplication *)application {
[UIAccelerometer sharedAccelerometer].delegate = self;
}
- (void) accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
if (self.lastAcceleration) {
if (!histeresisExcited && L0AccelerationIsShaking(self.lastAcceleration, acceleration, 0.7)) {
histeresisExcited = YES;
/* SHAKE DETECTED. DO HERE WHAT YOU WANT. */
} else if (histeresisExcited && !L0AccelerationIsShaking(self.lastAcceleration, acceleration, 0.2)) {
histeresisExcited = NO;
}
}
self.lastAcceleration = acceleration;
}
// and proper @synthesize and -dealloc boilerplate code
@end
组织性可以防止震动事件多次触发,直到用户停止震动。
你需要通过accelerometer:didAccelerate: method检查加速度计,这是UIAccelerometerDelegate协议的一部分,检查这些值是否超过了震动所需的移动量的阈值。
在AppController底部的accelerometer:didAccelerate:方法中有一些不错的示例代码。m在GLPaint例子中,这个例子可以在iPhone开发者网站上找到。
我最终使用撤销/重做管理器教程中的代码示例使其工作。 这正是你需要做的:
在应用的委托中设置applicationSupportsShakeToEdit属性:
- (void)applicationDidFinishLaunching:(UIApplication *)application {
application.applicationSupportsShakeToEdit = YES;
[window addSubview:viewController.view];
[window makeKeyAndVisible];
}
在视图控制器中添加/重写canBecomeFirstResponder, viewDidAppear:和viewWillDisappear:方法:
-(BOOL)canBecomeFirstResponder {
return YES;
}
-(void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
[self becomeFirstResponder];
}
- (void)viewWillDisappear:(BOOL)animated {
[self resignFirstResponder];
[super viewWillDisappear:animated];
}
添加motionEnded方法到你的视图控制器:
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
if (motion == UIEventSubtypeMotionShake)
{
// your code
}
}
查看GLPaint示例。
http://developer.apple.com/library/ios/#samplecode/GLPaint/Introduction/Intro.html
在ViewController中添加以下方法。M文件,它的工作正常
-(BOOL) canBecomeFirstResponder
{
/* Here, We want our view (not viewcontroller) as first responder
to receive shake event message */
return YES;
}
-(void) motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
if(event.subtype==UIEventSubtypeMotionShake)
{
// Code at shake event
UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Motion" message:@"Phone Vibrate"delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
[alert show];
[alert release];
[self.view setBackgroundColor:[UIColor redColor]];
}
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[self becomeFirstResponder]; // View as first responder
}
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