微信摇一摇实现原理，视图展示

Posted 2020-08-18 徐家汇123

一： 实现原理

 

在 UIResponder中存在这么一套方法

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);

- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);

这就是执行摇一摇的方法。那么怎么用这些方法呢？

很简单，你只需要让这个Controller本身支持摇动

同时让他成为第一相应者：

- (void)viewDidLoad

{

    [superviewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

    [[UIApplication sharedApplication] setApplicationSupportsShakeToEdit:YES];

    [self becomeFirstResponder];

}

 

//然后去实现那几个方法就可以了

- (void) motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event

{

    //检测到摇动

}

 

- (void) motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event

{

    //摇动取消

}

 

- (void) motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event

{

    //摇动结束

    if (event.subtype == UIEventSubtypeMotionShake) {

        //something happens

    }

}

　　

 

二： 动画效果实现

 

// 摇动结束 调用该方法即可
- (void)addAnimations
{
    AudioservicesPlaySystemSound (soundID);
    
    //让imgup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imagdown上下移动
    CABasicAnimation *translation = [CABasicAnimation animationWithKeyPath:@"position"];
    translation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    translation.fromValue = [NSValue valueWithCGPoint:CGPointMake(160, 345+44+20)];
    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"];
}