iOS的桌面背景运动效果

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_backgroundImage = [[UIImageView alloc] initWithFrame:CGRectMake(-50, -50, Screen_width+100, Screen_Height+100)];
    _backgroundImage.image = [UIImage imageNamed:@"bg_1"];
    [self.view addSubview:_backgroundImage];
    
    UIInterpolatingMotionEffect * backEffX = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.x" type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];// type表示沿水平方向运行效果
    backEffX.maximumRelativeValue = @(-50);
    backEffX.minimumRelativeValue = @(50);
    [self.backgroundImage addMotionEffect:backEffX];
    
    UIInterpolatingMotionEffect * backEffY = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.y" type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];
    backEffY.maximumRelativeValue = @(-50);
    backEffY.minimumRelativeValue = @(50);
    [self.backgroundImage addMotionEffect:backEffY];