thmodel_ios_model/model/Classes/Controllers/Controller/MessageVC/Gallery/NTESGalleryViewController.m

//
//  NTESGalleryViewController.m
//  NIMDemo
//
//  Created by ght on 15-2-3.
//  Copyright (c) 2015年 Netease. All rights reserved.
//

#import "NTESGalleryViewController.h"
#import "UIImageView+WebCache.h"
#import "UIView+NTES.h"
#import "NTESSnapchatAttachment.h"
#import "NTESSessionUtil.h"
#import "UIView+Toast.h"
#import "NTESMediaPreviewViewController.h"
#import "UIAlertView+NTESBlock.h"
#import "NIMKitAuthorizationTool.h"

@implementation NTESGalleryItem

@end


@interface NTESGalleryViewController ()
{
    BOOL _onceToken;
}
@property (strong, nonatomic) IBOutlet UIImageView *galleryImageView;
@property (nonatomic,strong)    NTESGalleryItem *currentItem;
@property (nonatomic,strong)    NIMSession *session;
@property (nonatomic,strong)  IBOutlet  UIScrollView *scrollView;
@end

@implementation NTESGalleryViewController

- (instancetype)initWithItem:(NTESGalleryItem *)item session:(NIMSession *)session
{
    if (self = [super initWithNibName:@"NTESGalleryViewController"
                               bundle:nil])
    {
        _currentItem = item;
        _session = session;
    }
    return self;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor blackColor];
    self.scrollView.showsVerticalScrollIndicator = NO;
    self.scrollView.showsHorizontalScrollIndicator = NO;

}



- (void)viewDidLayoutSubviews
{
    if (!_onceToken)
    {
        [self loadImage];
        _onceToken = YES;
    }
}
- (void)viewWillAppear:(BOOL)animated{
    self.tabBarController.tabBar.hidden = YES;
}

- (void)viewWillDisappear:(BOOL)animated{
    self.tabBarController.tabBar.hidden = NO;
}

- (void)loadImage
{
    UIEdgeInsets insets = UIEdgeInsetsZero;
    
    if (@available(iOS 11.0, *))
    {
        insets = self.scrollView.adjustedContentInset;
    }
    else
    {
        insets = self.scrollView.contentInset;
    }
    self.scrollView.contentSize = CGSizeMake(self.scrollView.width - insets.left - insets.right,
                                             self.scrollView.height - insets.top - insets.bottom);
    UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame = CGRectMake(0, 0, 40, 40);
    [btn setImage:[UIImage imageNamed:@"fanhui2"] forState:UIControlStateNormal];
    btn.imageEdgeInsets =  UIEdgeInsetsMake(0, -20, 0, 0);
    [btn addTarget:self action:@selector(backClick) forControlEvents:UIControlEventTouchUpInside];
    UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithCustomView:btn];
    UIBarButtonItem *nagetiveSpacer = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
    nagetiveSpacer.width = -12;//这个值可以根据自己需要自己调整
    self.navigationItem.leftBarButtonItems = @[nagetiveSpacer, leftItem];
    
    [self layoutGallery:_currentItem.size];
    
    NSURL *url = [NSURL URLWithString:_currentItem.imageURL];
    typeof(self) weakSelf = self;
    [self.galleryImageView sd_setImageWithURL:url
                             placeholderImage:[UIImage imageWithContentsOfFile:_currentItem.thumbPath]
                                      options:SDWebImageRetryFailed | SDWebImageAvoidAutoSetImage  completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
                                          dispatch_async(dispatch_get_main_queue(), ^
                                                         {
                                                             if (!error)
                                                             {
                                                                 [weakSelf layoutGallery:image.size];
                                                                 weakSelf.galleryImageView.image = image;
                                                             }
                                                         });
                                      }];
    if (self.session)
    {
        [self setupRightNavItem];
    }
    
    if ([_currentItem.name length])
    {
        self.navigationItem.title = _currentItem.name;
    }
    
    UILongPressGestureRecognizer *recognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(onLongPressImageView:)];
    [self.scrollView addGestureRecognizer:recognizer];
}

-(void)backClick{
    [self.navigationController popViewControllerAnimated:YES];
}

- (void)layoutGallery:(CGSize)size
{
    CGFloat width  = size.width;
    CGFloat height = size.height;
    
    CGFloat scale  = width > height? self.scrollView.contentSize.height / height : self.scrollView.contentSize.width / width;
    
    if (height * scale > self.scrollView.contentSize.height)
    {
        self.galleryImageView.size = CGSizeMake(width * scale, height * scale);
        self.scrollView.contentSize = self.galleryImageView.size;
        self.galleryImageView.contentMode = UIViewContentModeScaleAspectFill;
    }
    else
    {
        self.galleryImageView.size = self.scrollView.contentSize;
        self.galleryImageView.contentMode = UIViewContentModeScaleAspectFit;
    }
    
    self.galleryImageView.centerY = self.galleryImageView.height * .5f ;
}


- (void)setupRightNavItem
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button addTarget:self action:@selector(onMore:) forControlEvents:UIControlEventTouchUpInside];
    [button setImage:[UIImage imageNamed:@"icon_gallery_more_normal"] forState:UIControlStateNormal];
    [button setImage:[UIImage imageNamed:@"icon_gallery_more_pressed"] forState:UIControlStateHighlighted];
    [button sizeToFit];
    UIBarButtonItem *buttonItem = [[UIBarButtonItem alloc] initWithCustomView:button];
    self.navigationItem.rightBarButtonItem = buttonItem;
}


- (void)onMore:(id)sender
{
    NIMMessageSearchOption *option = [[NIMMessageSearchOption alloc] init];
    option.limit = 0;
    option.messageTypes = @[@(NIMMessageTypeImage),@(NIMMessageTypeVideo)];
    __weak typeof(self) weakSelf = self;
    [[NIMSDK sharedSDK].conversationManager searchMessages:self.session option:option result:^(NSError * _Nullable error, NSArray<NIMMessage *> * _Nullable messages) {
        if (weakSelf)
        {
            NSMutableArray *objects = [[NSMutableArray alloc] init];
            NTESMediaPreviewObject *focusObject;
            
            //显示的时候新的在前老的在后，逆序排列
            //如果需要微信的显示顺序，则直接将这段代码去掉即可
            NSArray *array = messages.reverseObjectEnumerator.allObjects;
            
            for (NIMMessage *message in array)
            {
                switch (message.messageType) {
                    case NIMMessageTypeVideo:{
                        NTESMediaPreviewObject *object = [weakSelf previewObjectByVideo:message.messageObject];
                        [objects addObject:object];
                        break;
                    }
                    case NIMMessageTypeImage:{
                        NTESMediaPreviewObject *object = [weakSelf previewObjectByImage:message.messageObject];
                        //图片 thumbPath 一致，就认为是本次浏览的图片
                        if ([message.messageId isEqualToString:weakSelf.currentItem.itemId])
                        {
                            focusObject = object;
                        }
                        [objects addObject:object];
                        break;
                    }
                    default:
                        break;
                }
            }
            NTESMediaPreviewViewController *vc = [[NTESMediaPreviewViewController alloc] initWithPriviewObjects:objects focusObject:focusObject];
            [weakSelf.navigationController pushViewController:vc animated:YES];
        }        
    }];
}

- (void)onLongPressImageView:(UILongPressGestureRecognizer *)gestureRecognizer
{
    if (gestureRecognizer.state == UIGestureRecognizerStateBegan)
    {
        UIAlertController *controller = [[UIAlertController alloc] init];
        __weak typeof(self) weakSelf = self;
        NSURL *url = [NSURL URLWithString:weakSelf.currentItem.imageURL];
        UIImage *image = [[SDWebImageManager sharedManager].imageCache imageFromCacheForKey:[[SDWebImageManager sharedManager] cacheKeyForURL:url]];
        if (image)
        {
            [[[controller addAction:@"保存至相册" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
                [NIMKitAuthorizationTool requestPhotoLibraryAuthorization:^(NIMKitAuthorizationStatus status) {
                    switch (status) {
                        case NIMKitAuthorizationStatusAuthorized:
                            UIImageWriteToSavedPhotosAlbum(image, weakSelf, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
                            break;
                        default:
                            [weakSelf.view makeToast:@"没有开启权限，请开启权限" duration:2.0 position:CSToastPositionCenter];
                            break;
                    }
                }];                    
            }]addAction:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {}] show];
        }
    }
}

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{
    NSString *toast = (!image || error)? [NSString stringWithFormat:@"保存图片失败 , 错误：%@",error] : @"保存图片成功";
    [self.view makeToast:toast duration:2.0 position:CSToastPositionCenter];
}

- (NTESMediaPreviewObject *)previewObjectByVideo:(NIMVideoObject *)object
{
    NTESMediaPreviewObject *previewObject = [[NTESMediaPreviewObject alloc] init];
    previewObject.objectId  = object.message.messageId;
    previewObject.thumbPath = object.coverPath;
    previewObject.thumbUrl  = object.coverUrl;
    previewObject.path      = object.path;
    previewObject.url       = object.url;
    previewObject.type      = NTESMediaPreviewTypeVideo;
    previewObject.timestamp = object.message.timestamp;
    previewObject.displayName = object.displayName;
    previewObject.duration  = object.duration;
    previewObject.imageSize = object.coverSize;
    return previewObject;
}

- (NTESMediaPreviewObject *)previewObjectByImage:(NIMImageObject *)object
{
    NTESMediaPreviewObject *previewObject = [[NTESMediaPreviewObject alloc] init];
    previewObject.objectId = object.message.messageId;
    previewObject.thumbPath = object.thumbPath;
    previewObject.thumbUrl  = object.thumbUrl;
    previewObject.path      = object.path;
    previewObject.url       = object.url;
    previewObject.type      = NTESMediaPreviewTypeImage;
    previewObject.timestamp = object.message.timestamp;
    previewObject.displayName = object.displayName;
    previewObject.imageSize = object.size;
    return previewObject;
}

@end




@interface SingleSnapView : UIImageView

@property (nonatomic,strong) UIProgressView *progressView;

@property (nonatomic,copy)   NIMCustomObject *messageObject;

- (instancetype)initWithFrame:(CGRect)frame messageObject:(NIMCustomObject *)object;

- (void)setProgress:(CGFloat)progress;

@end


@implementation  NTESGalleryViewController(SingleView)

+ (UIView *)alertSingleSnapViewWithMessage:(NIMMessage *)message baseView:(UIView *)view{
    NIMCustomObject *messageObject = (NIMCustomObject *)message.messageObject;
    if (![messageObject isKindOfClass:[NIMCustomObject class]] || ![messageObject.attachment isKindOfClass:[NTESSnapchatAttachment class]]) {
        return nil;
    }
    SingleSnapView *galleryImageView = [[SingleSnapView alloc] initWithFrame:[UIScreen mainScreen].bounds messageObject:messageObject];
    galleryImageView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    galleryImageView.backgroundColor = [UIColor blackColor];
    galleryImageView.contentMode  = UIViewContentModeScaleAspectFit;
    
    galleryImageView.userInteractionEnabled = NO;
    [view presentView:galleryImageView animated:YES complete:^{
        NTESSnapchatAttachment *attachment = (NTESSnapchatAttachment *)messageObject.attachment;
        if ([[NSFileManager defaultManager] fileExistsAtPath:attachment.filepath isDirectory:nil])
        {
            galleryImageView.image = [UIImage imageWithContentsOfFile:attachment.filepath];
            galleryImageView.progress = 1.0;
        }
        else
        {
            [NTESGalleryViewController downloadImage:attachment.url imageView:galleryImageView];
        }
    }];
    return galleryImageView;
}

+ (void)downloadImage:(NSString *)url imageView:(SingleSnapView *)imageView{
    __weak typeof(imageView) wImageView = imageView;    
    [imageView sd_setImageWithURL:[NSURL URLWithString:url] placeholderImage:nil options:SDWebImageCacheMemoryOnly progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
        dispatch_async_main_safe(^{
            wImageView.progress = (CGFloat)receivedSize / expectedSize;
        });
    } completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
        if (error) {
            [wImageView makeToast:@"下载图片失败"
                         duration:2
                         position:CSToastPositionCenter];
        }else{
            wImageView.progress = 1.0;
        }
    }];
}

@end


@implementation SingleSnapView

- (instancetype)initWithFrame:(CGRect)frame messageObject:(NIMCustomObject *)object
{
    self = [super initWithFrame:frame];
    if (self)
    {
        _messageObject = object;
        _progressView = [[UIProgressView alloc] initWithFrame:CGRectZero];
        CGFloat width = 200.f * UISreenWidthScale;
        _progressView.width = width;
        _progressView.hidden = YES;
        [self addSubview:_progressView];
    }
    return self;
}

- (void)setProgress:(CGFloat)progress{
    [self.progressView setProgress:progress];
    [self.progressView setHidden:progress>0.99];
}

- (void)layoutSubviews{
    [super layoutSubviews];
    self.progressView.centerY = self.height *.5;
    self.progressView.centerX = self.width  *.5;
}


@end