//
//  UIImageView+Utils.h
//  OpenWorkr
//
//  Created by 冰涼的枷鎖 on 2017/3/6.
//  Copyright © 2017年 Eden. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIImageView (Utils) <UIGestureRecognizerDelegate>

- (void)showBigImageInWindow;

@end

//
//  UIImageView+Utils.m
//  OpenWorkr
//
//  Created by 冰涼的枷鎖 on 2017/3/6.
 

//  Copyright © 2017年 Eden. All rights reserved.
//

#import "UIImageView+Utils.h"

@implementation UIImageView (Utils)

static CGRect oldframe;

- (void)showBigImageInWindow {

    UIImageView *currentImageview = self;
    UIImage *image = currentImageview.image;
    UIWindow *window = [UIApplication sharedApplication].keyWindow
 
;
    UIView *backgroundView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
    backgroundView.backgroundColor = [UIColor colorWithWhite:0.7 alpha:1];
    //當前imageview的原始尺寸->將畫素currentImageview.bounds由currentImageview.bounds所在檢視轉換到目標檢視window中，返回在目標檢視window中的畫素值
 

    oldframe = [currentImageview convertRect:currentImageview.bounds toView:window];
//    [backgroundView setBackgroundColor:[UIColor colorWithRed:107 green:107 blue:99 alpha:0.6]];

    //此時檢視不會顯示
    [backgroundView setAlpha:0];
    //將所展示的imageView重新繪製在Window中
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:oldframe];
    [imageView setUserInteractionEnabled:YES];
    [imageView setImage:image];
    [imageView setTag:10];
    [backgroundView addSubview:imageView];
    [window addSubview:backgroundView];

    //向imageView新增手勢 縮放圖片
    UIPanGestureRecognizer *pan =[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panAction:)];
    //新增到指定檢視
    [imageView addGestureRecognizer:pan];
    UIPinchGestureRecognizer *pinch =[[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchAction:)];
    [imageView addGestureRecognizer:pinch];
    UIRotationGestureRecognizer *rotation =[[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationAction:)];
    [imageView addGestureRecognizer:rotation];
    pinch.delegate = self;
    rotation.delegate = self;

    //新增點選事件同樣是類方法 -> 作用是再次點選回到初始大小
    UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideImageView:)];
    [backgroundView addGestureRecognizer:tapGestureRecognizer];

    //動畫放大所展示的ImageView
    [UIView animateWithDuration:0.4 animations:^{
        CGFloat y,width,height;
        y = ([UIScreen mainScreen].bounds.size.height - image.size.height * [UIScreen mainScreen].bounds.size.width / image.size.width) * 0.5;
        width = [UIScreen mainScreen].bounds.size.width;
        //高度 根據圖片寬高比設定
        height = image.size.height * [UIScreen mainScreen].bounds.size.width / image.size.width;
        [imageView setFrame:CGRectMake(0, y, width, height)];
        //重要！ 將檢視顯示出來
        [backgroundView setAlpha:1];
    } completion:^(BOOL finished) {

    }];

}

/**
 *  恢復imageView原始尺寸
 *
 *  @param tap 點選事件
 */
- (void)hideImageView:(UITapGestureRecognizer *)tap{
    UIView *backgroundView = tap.view;
    //原始imageview
    UIImageView *imageView = [tap.view viewWithTag:10];
    //恢復
    [UIView animateWithDuration:0.4 animations:^{
        [imageView setFrame:oldframe];
        [backgroundView setAlpha:0];
    } completion:^(BOOL finished) {
        //完成後操作->將背景檢視刪掉
        [backgroundView removeFromSuperview];
    }];
}

//建立平移事件
-(void)panAction:(UIPanGestureRecognizer *)pan
{
    UIImageView *imageView = (UIImageView *)pan.view;
    if (!imageView) {
        return ;
    }
    //獲取手勢的位置
    CGPoint position =[pan translationInView:imageView];

    //通過stransform 進行平移交換
    imageView.transform = CGAffineTransformTranslate(imageView.transform, position.x, position.y);
    //將增量置為零
    [pan setTranslation:CGPointZero inView:imageView];
}

//新增捏合事件
-(void)pinchAction:(UIPinchGestureRecognizer *)pinch
{
    UIImageView *imageView = (UIImageView *)pinch.view;
    if (!imageView) {
        return ;
    }
    //通過 transform(改變) 進行檢視的檢視的捏合
    imageView.transform = CGAffineTransformScale(imageView.transform, pinch.scale, pinch.scale);
    //設定比例 為 1
    pinch.scale = 1;
}

//旋轉事件
-(void)rotationAction:(UIRotationGestureRecognizer *)rote
{
    UIImageView *imageView = (UIImageView *)rote.view;
    if (!imageView) {
        return ;
    }
    //通過transform 進行旋轉變換
    imageView.transform = CGAffineTransformRotate(imageView.transform, rote.rotation);
    //將旋轉角度 置為 0
    rote.rotation = 0;
}

#pragma gesture delegate
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}

@end