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：
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//// 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 |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/u010981736/article/details/77749920
