IOS tableView cell动态高度 (autoLayout)

来源：互联网发布：虎门巨新网络老板编辑：程序博客网时间：2024/05/22 13:54

要做到使用autoLayout来生成动态高度的cell.cell里边子视图控件要使用autoLayout.

1.比如我定义的cell:

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier{    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];    if (self) {        // Initialization code        [self configUserInterface];    }    return self;}- (void)configUserInterface{    UIImageView *bgImageV = [[UIImageView alloc]init];    bgImageV.image = [[UIImage imageNamed:@"activityCellBox"]resizableImageWithCapInsets:UIEdgeInsetsMake(5, 5, 5, 5)];    [self addSubview:bgImageV];    [bgImageV mas_makeConstraints:^(MASConstraintMaker *make) {        make.left.equalTo(@(12 * GY_Ratio));        make.right.equalTo(self.mas_right).offset(-12 * GY_Ratio);        make.top.equalTo(@(15 * GY_Ratio));        make.bottom.equalTo(self.mas_bottom).offset(0);    }];    _mainContentImageV = [[UIImageView alloc]init];    [bgImageV addSubview:_mainContentImageV];    [_mainContentImageV mas_makeConstraints:^(MASConstraintMaker *make) {        make.left.equalTo(@0);        make.right.equalTo(bgImageV.mas_right).offset(0);        make.top.equalTo(bgImageV.mas_top);        make.height.equalTo(@(70 * GY_Ratio));    }];

    _activityContentLabel = [[UILabel alloc]init];    _activityContentLabel.numberOfLines = 0;    [bgImageV addSubview:_activityContentLabel];    [_activityContentLabel mas_makeConstraints:^(MASConstraintMaker *make) {        make.left.equalTo(@10);        make.right.equalTo(bgImageV.mas_right).offset(0);        make.top.equalTo(_mainContentImageV.mas_bottom).offset(5).priorityHigh();        make.bottom.equalTo(self.mas_bottom).offset(-1);    }];    _activityContentLabel.font = [UIFont systemFontOfSize:14 * GY_Ratio];    _activityContentLabel.textColor = [UIColor colorFromHexString:@"#575656"];    _activityStatusImageV = [[UIImageView alloc]init];    [bgImageV addSubview:_activityStatusImageV];    _activityStatusImageV.image = [UIImage imageNamed:@"activityStartingBg"];    [_activityStatusImageV mas_makeConstraints:^(MASConstraintMaker *make) {        make.right.equalTo(bgImageV.mas_right).offset(-10 * GY_Ratio);        make.bottom.equalTo(_mainContentImageV.mas_bottom).offset(0);        make.size.equalTo(_activityStatusImageV);    }];    _activityStatusLabel = [[UILabel alloc]init];    [_activityStatusImageV addSubview:_activityStatusLabel];    [_activityStatusLabel mas_makeConstraints:^(MASConstraintMaker *make) {        make.left.equalTo(_activityStatusImageV.mas_left);        make.centerY.equalTo(_activityStatusImageV.mas_centerY);        make.right.equalTo(_activityStatusImageV.mas_right).offset(0);        make.height.equalTo(@(20 * GY_Ratio));    }];    _activityStatusLabel.text = @"未知";    _activityStatusLabel.textColor = [UIColor whiteColor];    _activityStatusLabel.font = [UIFont systemFontOfSize:10 * GY_Ratio];    _activityStatusLabel.textAlignment = NSTextAlignmentCenter;}- (void)setContentWithModel:(GYActivityCenterModel *)model andPicSavePath:(NSString *)picSavePath{    NSString *picPathStr = [NSString stringWithFormat:@"%@/%@%@", API_ServerAddress, picSavePath, model.picName];    [_mainContentImageV sd_setImageWithURL:[NSURL URLWithString:picPathStr] placeholderImage:[UIImage imageNamed:@"isWinningBg"]];    _activityContentLabel.text = model.listDescription;    float needHeight = [self getLabelHeigth:_activityContentLabel];    [_activityTitleLabel layoutIfNeeded];    [_activityContentLabel mas_updateConstraints:^(MASConstraintMaker *make) {        make.height.equalTo(@(needHeight));    }];}#pragma mark - 获取label字符串所占的高度- (float)getLabelHeigth:(UILabel *)label{    CGSize size = [label.text boundingRectWithSize:(CGSize) {GY_MainWidth - 24 * GY_Ratio, 1000}        options     :NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading        attributes  :@{NSFontAttributeName : label.font}        context     :nil].size;    return size.height + 5;}

这里_activityContentLabel这个label可能所占用的高度不确定.所以在设置cell内容时,计算出其_activityContentLabel所占用的高度.其他控件的布局由于设置好的约束会随着改变布局.

2.我们要在tableViewDelegate 返回高度那儿

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{    GYActivityCenterCell *cell = (GYActivityCenterCell *)[tableView dequeueReusableCellWithIdentifier:cellIntifier];    GYActivityCenterModel *model = dataSourceArray[indexPath.row];    [cell setContentWithModel:model andPicSavePath:activityCenterModelLsit.savePath]; ///这里是设置填充内容到cell中.    [cell layoutIfNeeded];    CGFloat height = [cell systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;///这里就得到cell的实际高度.     return height;}

1 0