iOS實現圖片摺疊效果
阿新 • • 發佈:2020-02-21
本文例項為大家分享了iOS實現圖片摺疊效果的具體程式碼,供大家參考,具體內容如下
效果圖:
結構佈局:拖兩個UIImageView到控制器,設定相同的frame和圖片,再拖一個大的UIImageView蓋在上面,注意把大的imageView.userInteractionEnabled = YES;能夠新增手勢。
注意層次結構:
核心程式碼:
// // ViewController.m // 圖片摺疊 // // 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.讓上不圖片只顯示上半部分 self.topImageV.layer.contentsRect = CGRectMake(0,1,0.5); //2.讓下不圖片只顯示下半部分 self.buttomImageV.layer.contentsRect = CGRectMake(0,0.5,0.5); self.topImageV.layer.anchorPoint = CGPointMake(0.5,1); self.buttomImageV.layer.anchorPoint = CGPointMake(0.5,0); //設定漸變層 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]; } //這裡也可以手動給大的ImageView新增一個UIPanGestureRecognizer手勢 - (IBAction)pan:(UIPanGestureRecognizer *)pan { //獲取移動的偏移量 CGPoint transP = [pan translationInView:pan.view]; //讓上部圖片開始旋轉 CGFloat angle = transP.y * M_PI / 200; //近大遠小效果 CATransform3D transform = CATransform3DIdentity; //眼睛離螢幕的距離(透視效果) transform.m34 = -1 / 300.0; self.gradientL.opacity = transP.y * 1 / 200.0; self.topImageV.layer.transform = CATransform3DRotate(transform,-angle,0); if (pan.state == UIGestureRecognizerStateEnded) { self.gradientL.opacity = 0; //上部圖片復位 //usingSpringWithDamping:彈性係數 [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內容,希望對大家的學習有所幫助,也希望大家多多支援我們。