iOS实现墙纸的运动视差效果

运动效果Motion Effects：当设备上下左右倾斜会产生视差效果。在iOS7之后，UIInterpolatingMotionEffect提供了这样的功能

先看效果：
请忽略右下角的水印、渣图像、黑边、以及小灰球按钮

运动效果

开始敲代码

1. 新建工程，设置方向

   
   设置方向

2. 在SB中添加两个ImageView，分别为背景和仙女儿

   
   两个UIImageView
3. 代码

#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *back;
@property (weak, nonatomic) IBOutlet UIImageView *fairy;
@end
@implementation ViewController
-(void)viewDidLoad {
    [super viewDidLoad];
    [[UIApplication sharedApplication] setStatusBarHidden:YES];
        
    // 设置仙女的运动效果 ===== BEGIN =====
    // 设置在x轴的偏移范围
    UIInterpolatingMotionEffect * fairyEffX = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.x" type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];// type表示沿水平方向运行效果
    fairyEffX.maximumRelativeValue = @(50);
    fairyEffX.minimumRelativeValue = @(-50);
    // 为view添加运动效果
    [self.fairy addMotionEffect:fairyEffX];
    
    UIInterpolatingMotionEffect * fairyEffY = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.y" type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];
    fairyEffY.maximumRelativeValue = @(50);
    fairyEffY.minimumRelativeValue = @(-50);
    [self.fairy addMotionEffect:fairyEffY];
    
    // 设置背景的运动效果 ===== BEGIN =====
    UIInterpolatingMotionEffect * backEffX = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.x" type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];// type表示沿水平方向运行效果
    backEffX.maximumRelativeValue = @(-100);
    backEffX.minimumRelativeValue = @(100);
    [self.back addMotionEffect:backEffX];
    
    UIInterpolatingMotionEffect * backEffY = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.y" type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];
    backEffY.maximumRelativeValue = @(-100);
    backEffY.minimumRelativeValue = @(100);
    [self.back addMotionEffect:backEffY];
}
@end

4. 真机测试
   打开设置->通用->辅助功能->减弱动态效果->关闭
   酱婶儿才可以看到效果

Demo在这里