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！
