1、UIMotionEffect简介

　　在iOS7.0推出了UIMotionEffect运动视觉效果，就是从屏幕偏移不同角度、看到的效果不同！

NS_CLASS_AVAILABLE_IOS(7_0)@interface UIMotionEffect : NSObject 
     
      - (instancetype)init NS_DESIGNATED_INITIALIZER;- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder NS_DESIGNATED_INITIALIZER;//观察者的角度偏移viewerOffset，获取运动视觉效果的各项属性和值- (nullable NSDictionary
      
        *)keyPathsAndRelativeValuesForViewerOffset:(UIOffset)viewerOffset;@endtypedef NS_ENUM(NSInteger, UIInterpolatingMotionEffectType) {    UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis,//X轴    UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis//Y轴};@interface UIInterpolatingMotionEffect : UIMotionEffect- (instancetype)initWithKeyPath:(NSString *)keyPath type:(UIInterpolatingMotionEffectType)type NS_DESIGNATED_INITIALIZER;//初始化- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder NS_DESIGNATED_INITIALIZER;@property (readonly, nonatomic) NSString *keyPath;//获取角度偏移@property (readonly, nonatomic) UIInterpolatingMotionEffectType type;//获取类型@property (nullable, strong, nonatomic) id minimumRelativeValue;//最小角度偏移@property (nullable, strong, nonatomic) id maximumRelativeValue;//最大角度偏移@end@interface UIMotionEffectGroup : UIMotionEffect@property (nullable, copy, nonatomic) NSArray<__kindof UIMotionEffect *> *motionEffects;//添加水平和垂直效果添加到对应UI上@end
      
     

 

2、简单使用

- (void)addEffectWithOffset:(NSInteger)offset withView:(UIView *)view{    UIInterpolatingMotionEffect *effectX = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.x" type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];    effectX.minimumRelativeValue = @(-offset);    effectX.maximumRelativeValue = @(offset);        UIInterpolatingMotionEffect *effectY = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.y" type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];    effectY.minimumRelativeValue = @(-offset/2);    effectY.maximumRelativeValue = @(offset/2);    //    UIMotionEffectGroup *group = [[UIMotionEffectGroup alloc] init];//    group.motionEffects = @[effectX,effectY];    view.motionEffects = @[effectX,effectY];}