xib自定义非等高的cell

最新推荐文章于 2019-03-06 12:10:31 发布

转载最新推荐文章于 2019-03-06 12:10:31 发布 · 486 阅读

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/*
 1.在模型中增加一个 cellHeight属性，用来存放对于cell的高度
 2.在cell的模型属性的set方法中调用[self layoutIfNeed]方法强制布局，然后计算出cellHeight的值
 3.控制器中实现tableView:estimatedHeightForRowAtIndexPath方法，返回一个cell的估计高度，比如200
 4.控制器中实现tableView:heightForRowAtIndexPath方法，返回cell的真实高度（模型中的cellHeight属性）
 */

//
//  WeiboCell.h


#import <UIKit/UIKit.h>

@class WeiboModel;

@interface WeiboCell : UITableViewCell

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

/**
 *  模型属性
 */
@property(nonatomic,strong)WeiboModel *model;


@end

//
//  WeiboCell.m


#import "WeiboCell.h"
#import "WeiboModel.h"

@interface WeiboCell()
@property (weak, nonatomic) IBOutlet UIImageView *iconView;
@property (weak, nonatomic) IBOutlet UILabel *nameLabel;
@property (weak, nonatomic) IBOutlet UIImageView *vipView;
@property (weak, nonatomic) IBOutlet UILabel *contentLabel;
@property (weak, nonatomic) IBOutlet UIImageView *picView;

@end

@implementation WeiboCell

+ (instancetype)cellWithTableView:(UITableView *)tableView
{
    static NSString *ID = @"weibo";
    WeiboCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    if (cell == nil) {
        cell = [[[NSBundle mainBundle] loadNibNamed:NSStringFromClass(self) owner:nil options:nil] lastObject];
    }
    
    return cell;
}

- (void)awakeFromNib
{

    //设置label每一行文字的最大宽度
    //让UILabel计算尺寸更加准确
    self.contentLabel.preferredMaxLayoutWidth = [UIScreen mainScreen].bounds.size.width - 20;;
}

- (void)setModel:(WeiboModel *)model
{
    _model = model;
    
    if (model.isVip) {
        self.nameLabel.textColor = [UIColor orangeColor];
        self.vipView.hidden = NO;
    }else{
        self.nameLabel.textColor = [UIColor blackColor];
        self.vipView.hidden = YES;
    }
    
    self.iconView.image = [UIImage imageNamed:model.icon];
    self.nameLabel.text = model.name;
    self.contentLabel.text = model.text;
    if (model.picture) {
        self.picView.hidden = NO;
        self.picView.image = [UIImage imageNamed:model.picture];
    }else{
        self.picView.hidden = YES;
    }
    
    //强制布局
    [self layoutIfNeeded];
    
    //计算cell的高度
    if (self.picView.hidden) { //没有配图
        model.cellHeight = CGRectGetMaxY(self.contentLabel.frame) + 10;
    }else{ //有配图
        model.cellHeight = CGRectGetMaxY(self.picView.frame) + 10;
    }
}

@end

模型：

//
//  WeiboModel.h


#import <UIKit/UIKit.h>

@interface WeiboModel : NSObject
@property (strong, nonatomic) NSString *name;
@property (strong, nonatomic) NSString *text;
@property (strong, nonatomic) NSString *icon;
@property (strong, nonatomic) NSString *picture;
@property (assign, nonatomic, getter=isVip) BOOL vip;

+ (instancetype)weiboWithDict:(NSDictionary *)dict;

/**
 *  cell的高度
 */
@property(nonatomic,assign)CGFloat cellHeight;

@end

//
//  WeiboModel.m


#import "WeiboModel.h"

@implementation WeiboModel

+ (instancetype)weiboWithDict:(NSDictionary *)dict
{
    WeiboModel *model = [[self alloc] init];
    [model setValuesForKeysWithDictionary:dict];
    return model;
}

@end

控制器里：

//
//  WeiboController.m


#import "WeiboController.h"
#import "WeiboModel.h"
#import "WeiboCell.h"

@interface WeiboController ()
@property (strong, nonatomic) NSArray *weibos;
@end

@implementation WeiboController

- (NSArray *)weibos
{
    if (_weibos == nil) {
        // 加载plist中的字典数组
        NSString *path = [[NSBundle mainBundle] pathForResource:@"statuses.plist" ofType:nil];
        NSArray *dictArray = [NSArray arrayWithContentsOfFile:path];
        
        // 字典数组 -> 模型数组
        NSMutableArray *ArrayM = [NSMutableArray array];
        for (NSDictionary *dict in dictArray) {
            WeiboModel *model = [WeiboModel weiboWithDict:dict];
            [ArrayM addObject:model];
        }
        
        _weibos = ArrayM;
    }
    return _weibos;
}

- (void)viewDidLoad {
    [super viewDidLoad];
}

#pragma mark - Table view data source
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    return self.weibos.count;
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    WeiboCell *cell = [WeiboCell cellWithTableView:tableView];
    cell.model = self.weibos[indexPath.row];
    
    return cell;
}

#pragma mark - 代理方法
/**
 *  返回每一行的高度
 */
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    WeiboModel *model = self.weibos[indexPath.row];
    return model.cellHeight;
}

/**
 *  估计cell的高度
 
 *  只要返回了估计高度，那么就会先调用tableView:cellForRowAtIndexPath:创建cell，
 *  再调用tableView:heightForRowAtIndexPath:返回cell的真实高度
 */
- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 200;
}

@end

最后效果：