iOS 点击cell下拉

iOS  点击cell下拉

代码如下：

#import "ViewController.h"

@interface ViewController ()<UITableViewDataSource,UITableViewDelegate>
@property (nonatomic, copy) NSMutableArray *muArr;
@property (nonatomic, copy) NSMutableArray *boolArray;
@property (nonatomic, strong) UITableView *tableView;

@end

@implementation ViewController
#pragma mark - LifeCycle
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    self.view.backgroundColor = [UIColor whiteColor];
    NSArray *array1 = @[@"1",@"2",@"3",@"4",@"5"];
    NSArray *array2 = @[@"a",@"b",@"c",@"d",@"e",@"f"];
    [self.muArr addObject:array1];
    [self.muArr addObject:array2];
    
    for (int i = 0; i < self.muArr.count; i++) {
        [self.boolArray addObject:@"no"];
    }
    [self.view addSubview:self.tableView];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - UITableViewDataSource and ITableViewDelegate
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return self.muArr.count;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    //如果self.boolArray的内容为“yes”，返回self.muArr中某个数组的个数，否则返回2
    if ([self.boolArray[section] isEqualToString:@"yes"]) {
        return [[self.muArr objectAtIndex:section] count];
    } else {
        return 2;
    }
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return 45;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *cellID = @"cellID";
    UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:cellID];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID];
    }
    /*
    else {
        //如果不增加下面这个判断，tableview 再滑动后，会有重影，或者在被选中后会有重影
        NSArray *views = [cell subviews];
        for (UIView *obj in views) {
            if (obj.tag==1000 || obj.tag==2000) {
                NSLog(@"cell 要删除的子画面是：%@",[obj class]);
                [obj removeFromSuperview];
            }
        }
    }
    */
    //显示每个section的第一个
    if ([[self.muArr objectAtIndex:indexPath.section] count] > indexPath.row) {
        cell.textLabel.text = [[self.muArr objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];
    }
    //每个section的indexPath.row == 1显示为“更多”
    if ([self.boolArray[indexPath.section] isEqualToString:@"no"] && indexPath.row == 1 &&
        [[self.muArr objectAtIndex:indexPath.section] count] != 2) {
        cell.textLabel.text = nil;
        cell.textLabel.text = @"更多";
    }
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    NSMutableArray *array = [[NSMutableArray alloc] init];
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:1 inSection:indexPath.section]];

    if ([self.boolArray[indexPath.section] isEqualToString:@"no"]) {
        self.boolArray[indexPath.section] = @"yes";
        cell.textLabel.text = [[self.muArr objectAtIndex:indexPath.section] objectAtIndex:1];
        for (NSInteger i = 2; i < [[self.muArr objectAtIndex:indexPath.section] count]; i++) {
            NSIndexPath *index = [NSIndexPath indexPathForRow:i inSection:indexPath.section];
            [array addObject:index];
        }
        [self.tableView insertRowsAtIndexPaths:array withRowAnimation:UITableViewRowAnimationFade];
    }else{
        self.boolArray[indexPath.section] = @"no";
        cell.textLabel.text = @"更多";
        for (NSInteger i = 2; i < [[self.muArr objectAtIndex:indexPath.section] count]; i++) {
            NSIndexPath *index = [NSIndexPath indexPathForRow:i inSection:indexPath.section];
            [array addObject:index];
        }
        [self.tableView deleteRowsAtIndexPaths:array withRowAnimation:UITableViewRowAnimationFade];
    }
}

- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    if ([[self.muArr objectAtIndex:indexPath.section] count] == 2) {
        return nil;
    }
    if ([self.boolArray[indexPath.section] isEqualToString:@"yes"]) {
        return indexPath;
    }else{
        if (indexPath.row == 1) {
            return indexPath;
        }else{
            return nil;
        }
    }
}

#pragma mark - Getter and Setter
- (NSMutableArray *)muArr {
    if (!_muArr) {
        _muArr = [[NSMutableArray alloc] init];
    }
    return _muArr;
}

- (NSMutableArray *)boolArray {
    if (!_boolArray) {
        _boolArray = [[NSMutableArray alloc] init];
    }
    return _boolArray;
}

- (UITableView *)tableView {
    if (!_tableView) {
        _tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
        _tableView.delegate = self;
        _tableView.dataSource = self;
    }
    return _tableView;
}

@end