自适应cell

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface AutoModel : NSObject

@property (copy, nonatomic) NSString *title;
@property (copy, nonatomic) NSString *content;
@property (strong, nonatomic) UIImage *avatar;
@property (assign, nonatomic) CGFloat cellHeight;// Cache

@end

NS_ASSUME_NONNULL_END
//========================================
#import "AutoModel.h"

@implementation AutoModel

@end

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@class AutoModel;

@interface AutoCell : UITableViewCell

- (void)setupData:(AutoModel *)autoModel;

@end

NS_ASSUME_NONNULL_END
//======================================
#import "AutoCell.h"
#import "AutoModel.h"
#import <Masonry/Masonry.h>

@interface AutoCell ()

@property (nonatomic, strong) UIImageView *avatarImageView;
@property (nonatomic, strong) UILabel *titleLabel;
@property (nonatomic, strong) UILabel *contentLabel;
@property (nonatomic, strong) AutoModel *autoModel;

@end

@implementation AutoCell

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        self.selectionStyle = UITableViewCellSelectionStyleNone;
        [self initView];
    }
    return self;
}

- (void)setupData:(AutoModel *)autoModel {
    _autoModel = autoModel;

    _avatarImageView.image = autoModel.avatar;
    _titleLabel.text = autoModel.title;
    _contentLabel.text = autoModel.content;
}

- (void)initView {
    self.tag = 1000;

    // Avatar头像
    _avatarImageView = [UIImageView new];
    [self.contentView addSubview:_avatarImageView];
    [_avatarImageView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.width.and.height.equalTo(@44);
        make.left.and.top.equalTo(self.contentView).with.offset(4);
    }];

    // Title - 单行
    _titleLabel = [UILabel new];
    [self.contentView addSubview:_titleLabel];
    [_titleLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.height.equalTo(@22);
        make.top.equalTo(self.contentView).with.offset(4);
        make.left.equalTo(_avatarImageView.mas_right).with.offset(4);
        make.right.equalTo(self.contentView).with.offset(-4);
    }];

    // 计算UILabel的preferredMaxLayoutWidth值，多行时必须设置这个值，否则系统无法决定Label的宽度
    CGFloat preferredMaxWidth = [UIScreen mainScreen].bounds.size.width - 44 - 4 * 3; // 44 = avatar宽度，4 * 3为padding
    _contentLabel = [UILabel new];
    _contentLabel.numberOfLines = 0;
    _contentLabel.preferredMaxLayoutWidth = preferredMaxWidth; // 多行时必须设置
    [self.contentView addSubview:_contentLabel];
    [_contentLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(_titleLabel.mas_bottom).with.offset(4);
        make.left.equalTo(_avatarImageView.mas_right).with.offset(4);
        make.right.equalTo(self.contentView).with.offset(-4);
        make.bottom.equalTo(self.contentView).with.offset(-4);
    }];
    [_contentLabel setContentHuggingPriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisVertical];
}

@end

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end
//================================
#import "ViewController.h"
#import "AutoCell.h"
#import "AutoModel.h"

@interface ViewController ()<UITableViewDelegate, UITableViewDataSource>

@property (strong, nonatomic) UITableView *tableView;
@property (strong, nonatomic) AutoCell *templateCell;
@property (nonatomic, strong) NSArray *data;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    [self.view addSubview:self.tableView];
    [self generateData];
    [_tableView reloadData];
}

- (UITableView *)tableView {
    if (!_tableView) {
        _tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
        _tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
        _tableView.delegate = self;
        _tableView.dataSource = self;
        _tableView.estimatedRowHeight = 80.0f;
        _tableView.rowHeight = UITableViewAutomaticDimension;
        _tableView.sectionHeaderHeight = 0.0;
        _tableView.sectionFooterHeight = 0.0;
        _tableView.estimatedSectionHeaderHeight = 0.0;
        _tableView.estimatedSectionFooterHeight = 0.0;
        [_tableView registerClass:[AutoCell class] forCellReuseIdentifier:NSStringFromClass([AutoCell class])];
    }
    return _tableView;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return _data.count;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {

#ifdef IOS_8_NEW_FEATURE_SELF_SIZING
    // iOS 8 的Self-sizing特性
    return UITableViewAutomaticDimension;
#else

    if (!_templateCell) {
        _templateCell = [tableView dequeueReusableCellWithIdentifier:NSStringFromClass([AutoCell class])];
        _templateCell.tag = -1000; // For debug dealloc
    }

    // 获取对应的数据
    AutoModel *autoModel = _data[indexPath.row];

    // 判断高度是否已经计算过
    if (autoModel.cellHeight <= 0) {
        // 填充数据
        [_templateCell setupData:autoModel];
        // 根据当前数据，计算Cell的高度，注意+1
        autoModel.cellHeight = [_templateCell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height + 0.5f;
        NSLog(@"Calculate: %ld, height: %g", (long) indexPath.row, autoModel.cellHeight);
    } else {
        NSLog(@"Get cache: %ld, height: %g", (long) indexPath.row, autoModel.cellHeight);
    }

    return autoModel.cellHeight;
#endif
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    AutoCell *cell = [tableView dequeueReusableCellWithIdentifier:NSStringFromClass([AutoCell class]) forIndexPath:indexPath];
    [cell setupData:_data[indexPath.row]];
    return cell;
}

#pragma mark - Private methods

// 生成数据
- (void)generateData {
    NSMutableArray *tmpData = [NSMutableArray new];

    for (int i = 0; i < 20; i++) {
        AutoModel *autoModel = [AutoModel new];
        autoModel.avatar = [UIImage imageNamed:[NSString stringWithFormat:@"bluefaces_%d", (i % 4) + 1]];
        autoModel.title = [NSString stringWithFormat:@"Title: %d", i];
        autoModel.content = [NSString stringWithFormat:@"第%d条数据 == %@",i,[self getRandomLengthStr]];
        [tmpData addObject:autoModel];
    }
    _data = tmpData;
}

- (NSString *)getRandomLengthStr {
    NSMutableString *str = [NSMutableString string];
    for (NSInteger i = 0; i < (arc4random() % 50) + 10; i++) {
        [str appendString:@"content-"];
    }
    return [str copy];
}

@end

Simulator Screen Shot - iPhone 11 Pro Max - 2020-11-30 at 10.02.29.png