tederen_ios/smartRhino/Project/Other/Third/ZLCollectionFlowLayout/ZLCellFakeView.m

//
//  ZLCellFakeView.m
//  ZLCollectionView
//
//  Created by zhaoliang chen on 2018/7/25.
//  Copyright © 2018年 zhaoliang chen. All rights reserved.
//

#import "ZLCellFakeView.h"

@implementation ZLCellFakeView

- (instancetype)initWithCell:(UICollectionViewCell *)cell{
    self = [super initWithFrame:cell.frame];
    if (self) {
        self.cell = cell;
        
        self.layer.shadowColor = [UIColor blackColor].CGColor;
        self.layer.shadowOffset = CGSizeMake(0, 0);
        self.layer.shadowOpacity = 0;
        self.layer.shadowRadius = 5.0;
        self.layer.shouldRasterize = false;
        self.layer.masksToBounds = YES;
        self.clipsToBounds = YES;
        
        self.cellFakeImageView = [[UIImageView alloc]initWithFrame:self.bounds];
        self.cellFakeImageView.contentMode = UIViewContentModeScaleAspectFill;
        self.cellFakeImageView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
        
        self.cellFakeHightedView = [[UIImageView alloc]initWithFrame:self.bounds];
        self.cellFakeHightedView.contentMode = UIViewContentModeScaleAspectFill;
        self.cellFakeHightedView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
        
        cell.highlighted = YES;
        self.cellFakeHightedView.image = [self getCellImage];
        cell.highlighted = NO;
        self.cellFakeImageView.image = [self getCellImage];
        
        [self addSubview:self.cellFakeImageView];
        [self addSubview:self.cellFakeHightedView];
        
    }
    
    return self;
}

- (void)changeBoundsIfNeeded:(CGRect)bounds{
    if (CGRectEqualToRect(self.bounds, bounds)) {
        return;
    }
    [UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut|UIViewAnimationOptionBeginFromCurrentState animations:^{
        self.bounds = bounds;
    } completion:nil];
}

- (void)pushFowardView{
    [UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut|UIViewAnimationOptionBeginFromCurrentState animations:^{
        self.center = self.originalCenter;
        self.transform = CGAffineTransformMakeScale(1.1, 1.1);
        self.cellFakeHightedView.alpha = 0;
        
        CABasicAnimation *shadowAnimation = [CABasicAnimation animationWithKeyPath:@"shadowOpacity"];
        shadowAnimation.fromValue = @(0);
        shadowAnimation.toValue = @(0.7);
        shadowAnimation.removedOnCompletion = NO;
        shadowAnimation.fillMode = kCAFillModeForwards;
        [self.layer addAnimation:shadowAnimation forKey:@"applyShadow"];
    } completion:^(BOOL finished) {
        [self.cellFakeHightedView removeFromSuperview];
    }];
}

- (void)pushBackView:(void(^)(void))completion{
    [UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut|UIViewAnimationOptionBeginFromCurrentState animations:^{
        //self.transform = CGAffineTransformIdentity;
        //self.frame = self.cellFrame;
        CABasicAnimation *shadowAnimation = [CABasicAnimation animationWithKeyPath:@"shadowOpacity"];
        shadowAnimation.fromValue = @(0.7);
        shadowAnimation.toValue = @(0);
        shadowAnimation.removedOnCompletion = NO;
        shadowAnimation.fillMode = kCAFillModeForwards;
        [self.layer addAnimation:shadowAnimation forKey:@"removeShadow"];
    } completion:^(BOOL finished) {
        if (completion) {
            completion();
        }
    }];
}

- (UIImage *)getCellImage{
    UIGraphicsBeginImageContextWithOptions(_cell.bounds.size, NO, [UIScreen mainScreen].scale * 2);
    
    [self.cell.layer renderInContext:UIGraphicsGetCurrentContext()];
    
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

@end