iOS签到图标根据重力感应动画

最近有个小需求设置图标更加重力而旋转&＃xff0c;如图所示&＃xff1a;

图标的顶点固定&＃xff0c;其他部分根据重力旋转

代码&＃xff1a;

//添加重力头文件
#import
&＃64;interface ViewController ()
&＃64;property (nonatomic ,strong)UIImageView *qianBottomImg;//动画image
&＃64;property (nonatomic,strong) CMMotionManager *mManager;
&＃64;end


- (void)viewDidLoad {[super viewDidLoad];[self.view addSubview:self.qianBottomImg];[self setAnchorPoint:CGPointMake(0, 0) forView:self.qianBottomImg];//添加重力效果[self addCMMotionManagerAner];
}


#pragma mark &＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;添加重力效果&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;
-(void)addCMMotionManagerAner{self.mManager &＃61; [[CMMotionManager alloc]init];if (!self.mManager.accelerometerAvailable) {// fail code // 检查传感器到底在设备上是否可用}self.mManager.accelerometerUpdateInterval &＃61; 0.01; // 告诉manager&＃xff0c;更新频率是100Hz/* 加速度传感器开始采样&＃xff0c;每次采样结果在block中处理 */// 开始更新&＃xff0c;后台线程开始运行。[self.mManager startAccelerometerUpdatesToQueue:[NSOperationQueue currentQueue] withHandler:^(CMAccelerometerData *accelerometerData, NSError *error){// 获取系统在X、Y、Z轴上的加速度数据CMAccelerometerData *newestAccel &＃61; self.mManager.accelerometerData;double accelerationX &＃61; newestAccel.acceleration.x;double accelerationY &＃61; newestAccel.acceleration.y;
// double accelerationZ &＃61; newestAccel.acceleration.z;double ra &＃61; atan2(-accelerationY, accelerationX); // 返回值的单位为弧度&＃xff0c;atan2(x,y)返回的是点(x,y)与x轴的夹角
// ra &＃43;&＃61; ;
// double degree &＃61; ra * 360 / M_PI;
// NSLog(&＃64;"----- %f ----", degree);//平移[UIView animateWithDuration:0.4 animations:^{self.qianBottomImg.transform &＃61; CGAffineTransformMakeRotation(ra);}];}];
}
/**设置缩放或旋转围绕的点&＃64;param anchorPoint 围绕的点&＃64;param view 设置的视图*/
- (void)setAnchorPoint:(CGPoint)anchorPoint forView:(UIView *)view {CGPoint oldOrigin &＃61; view.frame.origin;view.layer.anchorPoint &＃61; anchorPoint;CGPoint newOrigin &＃61; view.frame.origin;CGPoint transition;transition.x &＃61; newOrigin.x - oldOrigin.x;transition.y &＃61; newOrigin.y - oldOrigin.y;view.center &＃61; CGPointMake (view.center.x - transition.x, view.center.y - transition.y);
}-(UIImageView *)qianBottomImg{if (!_qianBottomImg) {_qianBottomImg &＃61; ({UIImageView *imgView &＃61; [[UIImageView alloc]initWithFrame:CGRectMake(200, 200, 54, 57)];//添加图片imgView.image &＃61; [UIImage imageNamed:&＃64;"reading_signNotdone"];imgView.contentMode &＃61; UIViewContentModeScaleAspectFit;imgView ;}) ;}return _qianBottomImg ;
}


附上demo

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