自定义非等高cell02-xib

在model中加入一个属性，cell的高度。

LMTestModel.h

#import <UIKit/UIKit.h>
#import "LMTestModel.h"
@interface LMTestCell : UITableViewCell
@property (weak, nonatomic) IBOutlet UILabel *nameLabel;
@property (weak, nonatomic) IBOutlet UILabel *contentLabel;
@property (weak, nonatomic) IBOutlet UIImageView *pictureView;

+(LMTestCell *)cellWithTableView:(UITableView *)tableView;

-(void)setContent:(NSUInteger)index cellModel:(LMTestModel *)model;
@end

LMTestCell.h

#import <UIKit/UIKit.h>
#import "LMTestModel.h"
@interface LMTestCell : UITableViewCell
@property (weak, nonatomic) IBOutlet UILabel *nameLabel;
@property (weak, nonatomic) IBOutlet UILabel *contentLabel;
@property (weak, nonatomic) IBOutlet UIImageView *pictureView;

+(LMTestCell *)cellWithTableView:(UITableView *)tableView;

-(void)setContent:(NSUInteger)index cellModel:(LMTestModel *)model;
@end

LMTestCell.m

#import "LMTestCell.h"
#import "LMTestModel.h"
@implementation LMTestCell
+(LMTestCell *)cellWithTableView:(UITableView *)tableView
{
    static NSString *cellid = @"LMTestCellID";
    LMTestCell *cell = [tableView dequeueReusableCellWithIdentifier:cellid];
    if (!cell) {
        cell = [[NSBundle mainBundle]loadNibNamed:@"LMTestCell" owner:self options:nil][0];
    }
    return cell;

}
-(void)awakeFromNib
{
    [super awakeFromNib];
    //设置label每一行文字的最大宽度
    self.contentLabel.preferredMaxLayoutWidth = [UIScreen mainScreen].bounds.size.width-10*2;
}
-(void)setContent:(NSUInteger)index cellModel:(LMTestModel *)model{
    [self.nameLabel setText:model.name];
    [self.contentLabel setText:model.content];
    if (model.url) {
        self.pictureView.hidden = NO;
        [self.pictureView setImage:[UIImage imageNamed:@"1"]];
        NSURL *url = [NSURL URLWithString:model.url];
        dispatch_async(dispatch_queue_create(0, DISPATCH_QUEUE_CONCURRENT), ^{
            NSData *data = [NSData dataWithContentsOfURL:url];
            dispatch_async(dispatch_get_main_queue(), ^{
                [self.pictureView setImage:[UIImage imageWithData:data]];
            });
        });
    }else
    {
        self.pictureView.hidden = YES;
    }
    [self layoutIfNeeded];

    if (self.pictureView.hidden) {
         model.cellHeight = CGRectGetMaxY(self.contentLabel.frame)+10;
    }else
    {
        model.cellHeight = CGRectGetMaxY(self.pictureView.frame)+10;
    }
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];

    // Configure the view for the selected state
}

@end

ViewController.m

#import "ViewController.h"
#import "LMTestCell.h"
@interface ViewController ()<UITableViewDelegate,UITableViewDataSource>
{
    UITableView *_weiboTableView;

}

/* 存放所有的model */
@property(nonatomic,strong)NSArray *models;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    UITableView *tableView = [[UITableView alloc]initWithFrame:self.view.bounds style:UITableViewStylePlain];

    _weiboTableView = tableView;
    _weiboTableView.delegate = self;
    _weiboTableView.dataSource = self;
    [self.view addSubview:_weiboTableView];

}

-(NSArray *)models
{
    if(!_models)
    {
        LMTestModel *model1 = [[LMTestModel alloc]init];
        model1.name = @"丫丫乐";
        model1.content = @"oh my baby baby ,oh....";
        model1.url = @"https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1462862903&di=4aedac5cd95d7605bc76d539064ddb14&src=http://img2.3lian.com/2014/f4/197/d/97.jpg";
        LMTestModel *model2 = [[LMTestModel alloc]init];
        model2.name = @"丫丫乐";
        model2.content = @"新浪网新闻中心是新浪网最重要的频道之一,24小时滚动报道国内、国际及社会新闻。每日编发新闻数以万计。ews.sina.com.cn/  - 百度快照 - 77%好评";

        _models = @[model1,model2];
    }
    return _models;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.models.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    LMTestCell *cell = [LMTestCell cellWithTableView:tableView];
    LMTestModel *model = self.models[indexPath.row];

    [cell setContent:indexPath.row cellModel:model];

    return cell;
}
#pragma mark - 02-自定义非等高cell
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    //cellForRowAtIndexPath:获取已经在tableivew中显示的cell。
    LMTestModel *model = self.models[indexPath.row];
    return model.cellHeight;
}
/**
 返回每一行的估计高度
 只返回了估计高度，那么就会先调用tableView:cellForRowIndexPath:方法创建cell，在调用tableView heightForRowAtIndexPath:方法获取cell的真实高度。
 */
-(CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 250;
}

@end