UIScrollView视差模糊效果

效果

源码

////  ScrollBlurImageViewController.m//  Animations////  Created by YouXianMing on 15/11/25.//  Copyright © 2015年 YouXianMing. All rights reserved.//#import "ScrollBlurImageViewController.h"#import "MoreInfoView.h"#import "UIView+SetRect.h"#import "Math.h"#import "UIImage+ImageEffects.h"static int viewTag = 0x11;@interface ScrollBlurImageViewController () 
    
     @property (nonatomic, strong) NSArray       *picturesArray;@property (nonatomic, strong) UIScrollView  *scrollView;@property (nonatomic, strong) Math          *onceLinearEquation;@end@implementation ScrollBlurImageViewController- (void)viewDidLoad {        [super viewDidLoad];}- (void)setup {        [super setup];        MATHPoint pointA = MATHPointMake(0, -50);    MATHPoint pointB = MATHPointMake(self.view.width, self.view.width - 50);;    self.onceLinearEquation = [Math mathOnceLinearEquationWithPointA:pointA PointB:pointB];        // Init pictures data.    self.picturesArray = @[[UIImage imageNamed:@"beauty"],                           [[UIImage imageNamed:@"beauty"] blurImage],                           [[UIImage imageNamed:@"beauty"] grayScale]];        // Init scrollView.    CGFloat height = self.view.height;    CGFloat width  = self.view.width;        _scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];    _scrollView.delegate                       = self;    _scrollView.pagingEnabled                  = YES;    _scrollView.backgroundColor                = [UIColor blackColor];    _scrollView.showsHorizontalScrollIndicator = NO;    _scrollView.bounces                        = NO;    _scrollView.contentSize                    = CGSizeMake(self.picturesArray.count * width, height);    [self.view addSubview:_scrollView];        // Init moreInfoViews.    for (int i = 0; i < self.picturesArray.count; i++) {                MoreInfoView *show     = [[MoreInfoView alloc] initWithFrame:CGRectMake(i * width, 0, width, height)];        show.imageView.image   = self.picturesArray[i];        show.layer.borderWidth = 0.25f;        show.layer.borderColor = [[UIColor grayColor] colorWithAlphaComponent:0.25f].CGColor;        show.tag               = viewTag + i;                [_scrollView addSubview:show];    }        [self bringTitleViewToFront];}- (void)scrollViewDidScroll:(UIScrollView *)scrollView {        CGFloat X = scrollView.contentOffset.x;        for (int i = 0; i < self.picturesArray.count; i++) {                MoreInfoView *show = [scrollView viewWithTag:viewTag + i];        show.imageView.x   = _onceLinearEquation.k * (X - i * self.view.width) + _onceLinearEquation.b;    }}@end
    

细节