iOS实现图片折叠效果

本文实例为大家分享了iOS实现图片折叠效果的具体代码，供大家参考，具体内容如下

效果图：

结构布局：拖两个UIImageView到控制器，设置相同的frame和图片，再拖一个大的UIImageView盖在上面，注意把大的imageView.userInteractionEnabled = YES;能够添加手势。

注意层次结构：

核心代码：

//// ViewController.m// 图片折叠//// Created by llkj on 2017/8/31.// Copyright © 2017年 LayneCheung. All rights reserved.//#import \"ViewController.h\"@interface ViewController ()@property (weak, nonatomic) IBOutlet UIImageView *topImageV;@property (weak, nonatomic) IBOutlet UIImageView *buttomImageV;@property (nonatomic, weak) CAGradientLayer *gradientL;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];//1.让上不图片只显示上半部分self.topImageV.layer.contentsRect = CGRectMake(0, 0, 1, 0.5);//2.让下不图片只显示下半部分self.buttomImageV.layer.contentsRect = CGRectMake(0, 0.5, 1, 0.5);self.topImageV.layer.anchorPoint = CGPointMake(0.5, 1);self.buttomImageV.layer.anchorPoint = CGPointMake(0.5, 0);//设置渐变层CAGradientLayer *gradidentL = [CAGradientLayer layer];gradidentL.frame = self.buttomImageV.bounds;gradidentL.opacity = 0;gradidentL.colors = @[(id)[UIColor clearColor].CGColor, (id)[UIColor blackColor].CGColor];self.gradientL = gradidentL;[self.buttomImageV.layer addSublayer:gradidentL];}//这里也可以手动给大的ImageView添加一个UIPanGestureRecognizer手势- (IBAction)pan:(UIPanGestureRecognizer *)pan {//获取移动的偏移量CGPoint transP = [pan translationInView:pan.view];//让上部图片开始旋转CGFloat angle = transP.y * M_PI / 200;//近大远小效果CATransform3D transform = CATransform3DIdentity;//眼睛离屏幕的距离(透视效果)transform.m34 = -1 / 300.0;self.gradientL.opacity = transP.y * 1 / 200.0;self.topImageV.layer.transform = CATransform3DRotate(transform, -angle, 1, 0, 0);if (pan.state == UIGestureRecognizerStateEnded) {self.gradientL.opacity = 0;//上部图片复位//usingSpringWithDamping:弹性系数[UIView animateWithDuration:0.5 delay:0 usingSpringWithDamping:0.5 initialSpringVelocity:0 options:UIViewAnimationOptionCurveLinear animations:^{self.topImageV.layer.transform = CATransform3DIdentity;} completion:^(BOOL finished) {}];}}@end

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