iOS 开发--相对来说比较简单的cell高度自适应

开发过程中，会很少使用系统自带的cell，一般都会自定义cell，用来展示各式各样的界面布局，所以我们要自定义cell---------项目中用过很多种cell高度自适应的算法，都感觉挺麻烦的，这个方法相对来说简单易懂，希望对大家有帮助
1、创建存储数据类：

image.png

2、创建自定义cell类：.h文件

#import <UIKit/UIKit.h>
@class HHPollingItemsModel;

@interface HHPollingDetailCell : UITableViewCell

@property (nonatomic, strong) UILabel *titleLabel;
@property (nonatomic, strong) UILabel *lineLabel;

@property (nonatomic, strong) UILabel *valueLabel;
@property (nonatomic, strong) HHPollingItemsModel *model;

//类方法，返回的值用来计算cell的高度
+ (CGFloat)heightWithModel:(HHPollingItemsModel *)model;

@end

.m文件

#import "HHPollingDetailCell.h"
#import "HHPollingItemsModel.h"

@implementation HHPollingDetailCell

//初始化自定义控件
- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
        self.titleLabel = [[UILabel alloc] init];
        self.titleLabel.font = [UIFont systemFontOfSize:14.0];
        self.titleLabel.numberOfLines = 0;
        self.titleLabel.textColor = kColor(164, 164, 164);
        [self addSubview:self.titleLabel];
        
        self.valueLabel = [[UILabel alloc] init];
        self.valueLabel.font = [UIFont systemFontOfSize:14.0];
        self.valueLabel.textColor = kColor(164, 164, 164);
        [self addSubview:self.valueLabel];

        _lineLabel = [[UILabel alloc] init];
        _lineLabel.backgroundColor = [UIColor colorWithHexString:@"#E4EEF0"];
        [self addSubview:_lineLabel];
    }
    return self;
}

//由于cell的布局特殊化，所有约束条件都在layoutSubviews方法中写
- (void)layoutSubviews
{
    [super layoutSubviews];
    
    [self.valueLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.equalTo(self);
        make.right.equalTo(self).with.offset(-15);
        make.height.equalTo(@(14));
    }];
    
    //由于cell的高度是用该控件来撑开，所以不用给它高度约束
    [self.titleLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self).with.offset(10);
        make.left.equalTo(self).with.offset(15);
        make.right.equalTo(self).with.offset(-70);
    }];

    [_lineLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.bottom.equalTo(self);
        make.left.equalTo(self);
        make.right.equalTo(self);
        make.height.equalTo(@(1));
    }];
}

//model的set方法，用来给自定义控件赋值
- (void)setModel:(HHPollingItemsModel *)model
{
    if ([model.itemType isEqualToString:@"0"]) {
        self.titleLabel.text = [NSString stringWithFormat:@"%@", model.itemName];
        self.valueLabel.text = model.itemValue;
    } else if ([model.itemType isEqualToString:@"1"]) {
        self.titleLabel.text = [NSString stringWithFormat:@"%@/%@", model.itemName, model.itemContent];
        self.valueLabel.text = model.itemValue;
    } else {
        self.titleLabel.text = [NSString stringWithFormat:@"%@", model.itemName];
        self.valueLabel.text = model.itemValue;
    }
}

//注意：这是写这篇文章的重中之重，核心代码
+ (CGFloat)heightWithModel:(HHPollingItemsModel *)model
{
    HHPollingDetailCell *cell = [[HHPollingDetailCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@""];
    [cell setModel:model];
    [cell layoutIfNeeded];
    CGRect frame = cell.titleLabel.frame;
    return frame.origin.y + frame.size.height + 10;
}

@end

3、最后一步：在含有tableView的控制器中调用cell中的类方法，用来计算动态的cell高度

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    //取出model
    HHPollingItemsModel *model = self.items[indexPath.row];
    return [HHPollingDetailCell heightWithModel:model];
}

好了，这就是cell高度自适应的全过程，亲测使用带有图片、文字或者图片加文字的cell高度自适应
下面就是自适应后的布局：

image.png
image.png

还有更简单更实用的，望多指教，谢谢！