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TUIKit/TUIGroup/CommonUI/TUIGroupMembersView.m

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+//
+//  TUIGroupMembersView.m
+//  TUIKit
+//
+//  Created by kennethmiao on 2018/10/11.
+//  Copyright © 2018 Tencent. All rights reserved.
+//
+
+#import "TUIGroupMembersView.h"
+#import <TIMCommon/TIMDefine.h>
+#import <TUICore/TUIGlobalization.h>
+
+@interface TUIGroupMembersView () <UISearchBarDelegate, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>
+@property(nonatomic, strong) NSMutableArray<TUIGroupMemberCellData *> *data;
+@end
+
+@implementation TUIGroupMembersView
+- (id)initWithFrame:(CGRect)frame {
+    self = [super initWithFrame:frame];
+    if (self) {
+        [self setupViews];
+    }
+    return self;
+}
+
+- (void)setupViews {
+    self.backgroundColor = [UIColor whiteColor];
+    _flowLayout = [[UICollectionViewFlowLayout alloc] init];
+    _flowLayout.headerReferenceSize = CGSizeMake(self.frame.size.width, TGroupMembersController_Margin);
+    CGSize cellSize = [TUIGroupMemberCell getSize];
+
+    CGFloat y = _searchBar.frame.origin.y + _searchBar.frame.size.height;
+    _collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(TGroupMembersController_Margin, y,
+                                                                         self.frame.size.width - 2 * TGroupMembersController_Margin, self.frame.size.height - y)
+                                         collectionViewLayout:_flowLayout];
+    [_collectionView registerClass:[TUIGroupMemberCell class] forCellWithReuseIdentifier:TGroupMemberCell_ReuseId];
+    _collectionView.collectionViewLayout = _flowLayout;
+    _collectionView.delegate = self;
+    _collectionView.dataSource = self;
+    _collectionView.showsHorizontalScrollIndicator = NO;
+    _collectionView.showsVerticalScrollIndicator = NO;
+    _collectionView.backgroundColor = [UIColor clearColor];
+    _collectionView.contentInset = UIEdgeInsetsMake(0, 0, TMessageController_Header_Height, 0);
+    [self addSubview:_collectionView];
+
+    _indicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
+    _indicatorView.hidesWhenStopped = YES;
+    [self.collectionView addSubview:_indicatorView];
+
+    _flowLayout.minimumLineSpacing =
+        (_collectionView.frame.size.width - cellSize.width * TGroupMembersController_Row_Count) / (TGroupMembersController_Row_Count - 1);
+    ;
+    _flowLayout.minimumInteritemSpacing = _flowLayout.minimumLineSpacing;
+}
+
+- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
+    return _data.count;
+}
+
+- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
+    TUIGroupMemberCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:TGroupMemberCell_ReuseId forIndexPath:indexPath];
+    TUIGroupMemberCellData *data = _data[indexPath.row];
+    [cell setData:data];
+    return cell;
+}
+
+- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
+}
+
+- (CGSize)collectionView:(UICollectionView *)collectionView
+                    layout:(UICollectionViewLayout *)collectionViewLayout
+    sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
+    return [TUIGroupMemberCell getSize];
+}
+
+#pragma mark - Load
+- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
+    if (scrollView.contentOffset.y > 0 && (scrollView.contentOffset.y >= scrollView.bounds.origin.y)) {
+        [self loadMoreData];
+    }
+}
+
+- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar {
+    searchBar.showsCancelButton = YES;
+    UIButton *cancleBtn = [searchBar valueForKey:@"cancelButton"];
+    [cancleBtn setTitle:TIMCommonLocalizableString(Cancel) forState:UIControlStateNormal];
+}
+
+- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar {
+    searchBar.showsCancelButton = NO;
+    searchBar.text = @"";
+    [searchBar resignFirstResponder];
+}
+
+- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
+    searchBar.showsCancelButton = NO;
+    [searchBar resignFirstResponder];
+    [self reloadData];
+}
+
+- (void)setData:(NSMutableArray<TUIGroupMemberCellData *> *)data {
+    _data = data;
+    [self reloadData];
+}
+
+- (void)reloadData {
+    [self.collectionView reloadData];
+    [self.collectionView layoutIfNeeded];
+    self.indicatorView.frame = CGRectMake(0, self.collectionView.contentSize.height, self.collectionView.bounds.size.width, TMessageController_Header_Height);
+    if (self.collectionView.contentSize.height > self.collectionView.frame.size.height) {
+        [self.indicatorView startAnimating];
+    } else {
+        [self.indicatorView stopAnimating];
+    }
+}
+
+- (void)loadMoreData {
+    if (![self.delegate respondsToSelector:@selector(groupMembersView:didLoadMoreData:)]) {
+        CGPoint point = self.collectionView.contentOffset;
+        point.y -= TMessageController_Header_Height;
+        [self.collectionView setContentOffset:point animated:YES];
+        return;
+    }
+
+    static BOOL isLoading = NO;
+    if (isLoading) {
+        return;
+    }
+    isLoading = YES;
+    __weak typeof(self) weakSelf = self;
+    [self.delegate groupMembersView:self
+                    didLoadMoreData:^(NSArray<TUIGroupMemberCellData *> *moreData) {
+                      isLoading = NO;
+                      [weakSelf.data addObjectsFromArray:moreData];
+                      CGPoint point = self.collectionView.contentOffset;
+                      point.y -= TMessageController_Header_Height;
+                      [weakSelf.collectionView setContentOffset:point animated:YES];
+                      [weakSelf reloadData];
+                    }];
+}
+
+@end