• UITableView 高级(动态cell高度 自定义cell)


    UITableView 高级 

     

        自定义cell

        1.创建一个继承于UITableViewCell的子类

        2.根据展示的内容, 选择合适的控件, 并写属性

        3.重写cell的初始化方法, 在方法内部, 创建控件

        4.使用cell

    PersonCell.m
    #import <UIKit/UIKit.h>
    @interface PersonCell : UITableViewCell
    //注: 不要和UITableViewCell的属性重名
    @property (nonatomic, retain) UIImageView *photoView;
    @property (nonatomic, retain) UILabel *nameLabel, *genderLabel, *signatureLabel;
    @end
    PersonCell.m
    #import "PersonCell.h"
    #define kMargin 10
    #define kImageSize 80
    #define KNameWidth 150
    #define KLabelHeight 35
    #define KScreenWidth [UIScreen mainScreen].bounds.size.width
    @implementation PersonCell
    - (void)dealloc {
        [_photoView release];
        [_nameLabel release];
        [_genderLabel release];
        [_signatureLabel release];
        [super dealloc];
    }
    
    - (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
        self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
        if (self) {
             头像
            self.photoView = [[UIImageView alloc] initWithFrame:CGRectMake(kMargin, kMargin, kImageSize, kImageSize)];
            //圆角的半径
            self.photoView.layer.cornerRadius = 40;
            self.photoView.clipsToBounds = YES;
    //        self.photoView.layer.masksToBounds = YES;
            self.photoView.layer.borderWidth = 2;
            self.photoView.layer.borderColor = [UIColor colorWithRed:0.645 green:1.000 blue:0.970 alpha:1.000].CGColor;
            [self.contentView addSubview:_photoView];
            [_photoView release];
            
            姓名
            self.nameLabel = [[UILabel alloc] initWithFrame:CGRectMake(kMargin * 2 + kImageSize, kMargin, KNameWidth, KLabelHeight)];
    //        self.nameLabel.backgroundColor = [UIColor redColor];
            [self.contentView addSubview:_nameLabel];
            [self.nameLabel release];
            
            CGRect rect = CGRectMake(10, 10, 50, 50);
            获取矩形区域的宽度
            CGRectGetWidth(rect);
            获取矩形区域的高度
            CGRectGetHeight(rect);
            获取矩形区域的最小的X值
            CGRectGetMinX(rect);
            获取矩形区域的中间的X值
            CGRectGetMidX(rect);
            获取矩形区域的最大的X值
            CGRectGetMaxX(rect);
            //性别
            self.genderLabel = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMaxX(self.nameLabel.frame) + kMargin, kMargin,KScreenWidth - kMargin * 2 - CGRectGetMaxX(self.nameLabel.frame) , KLabelHeight)];
    //        self.genderLabel.backgroundColor = [UIColor greenColor];
            [self.contentView addSubview:_genderLabel];
            [self.genderLabel release];
            
            //个性签名
            self.signatureLabel = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMinX(self.nameLabel.frame), CGRectGetMaxY(self.nameLabel.frame) + kMargin, KScreenWidth - 2 * kMargin - CGRectGetMaxX(self.photoView.frame), KLabelHeight)];
            self.signatureLabel.font = [UIFont systemFontOfSize:13];
            self.signatureLabel.numberOfLines = 0;
    //        self.signatureLabel.backgroundColor = [UIColor blueColor];
            [self.contentView addSubview:_signatureLabel];
            [self.signatureLabel release];
            
        }
        return self;
    }

       

    多种cell的混合使用

        1.根据需求不同, 返回不同的cell

        2.必须保证cell的重用标志是不同的

    UITableViewCell.h
    #import <UIKit/UIKit.h>
    @interface MessageCell : UITableViewCell
    @property (nonatomic, retain) UIImageView *photoView;
    @property (nonatomic, retain) UILabel *chatLabel;
    @end
    UITableViewCell.m
    #import "MessageCell.h"
    
    #define KImageSize 80
    #define kMargin 10
    #define KScreenWidth [UIScreen mainScreen].bounds.size.width
    
    @implementation MessageCell
    
    - (void)dealloc {
        [_photoView release];
        [_chatLabel release];
        [super dealloc];
    }
    
    - (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
        self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
        if (self) {
            self.photoView = [[UIImageView alloc] initWithFrame:CGRectMake(KScreenWidth - KImageSize - kMargin , kMargin, KImageSize, KImageSize)];
            self.photoView.layer.cornerRadius = 40;
            self.photoView.clipsToBounds = YES;
            self.photoView.layer.borderWidth = 2;
            self.photoView.layer.borderColor = [UIColor colorWithRed:0.645 green:1.000 blue:0.970 alpha:1.000].CGColor;
            [self.contentView addSubview:_photoView];
            [_photoView release];
            
            self.chatLabel = [[UILabel alloc] initWithFrame:CGRectMake(kMargin, kMargin, KScreenWidth - 3 * kMargin - KImageSize, KImageSize)];
            self.chatLabel.numberOfLines = 0;
            self.chatLabel.backgroundColor = [UIColor colorWithRed:0.789 green:1.000 blue:0.970 alpha:1.000];
            self.chatLabel.layer.borderWidth = 1;
            [self.contentView addSubview:_chatLabel];
            [_chatLabel release];           
        }
        return  self;
    }
    #pragma mark - UITableViewDataSource
    - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    
        // Return the number of sections.
        return 1;
    }
    - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
        // Return the number of rows in the section.
        return 10;
    }
    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
        if (indexPath.row % 2 == 0) {
            static NSString *string = @"OK";
            PersonCell *cell = [tableView dequeueReusableCellWithIdentifier:string];
            if (cell == nil) {
                cell = [[PersonCell alloc] initWithStyle:(UITableViewCellStyleSubtitle) reuseIdentifier:string];
            }
            cell.photoView.image = [UIImage imageNamed:@"image.jpg"];
            cell.nameLabel.text = @" 美眉";
            cell.genderLabel.text = @"";
            cell.signatureLabel.text = @"个性签名: 当你对成功的渴望足以与呼吸的欲望相媲美时,你就会成功!";
            return cell;
    
        } else {
        static NSString *string = @"Hello";
        MessageCell *cell = [tableView dequeueReusableCellWithIdentifier:string];
        if (cell == nil) {
            cell = [[MessageCell alloc] initWithStyle:(UITableViewCellStyleSubtitle) reuseIdentifier:string];
        }
        cell.photoView.image = [UIImage imageNamed:@"other.jpg"];
        cell.chatLabel.text = @"    让人迷茫的原因只有一个,那就是本该拼搏的年纪,想的太多,做的太少。";
        return cell;
        }
    }

        动态cell高度

        1.展示内容的控件的高度修改

        a. numberOfLines

        b. boundingRectWithSize

        2.修改cell的高度

     HomeTableViewCell.h
    #import <UIKit/UIKit.h>
    @class Joke;
    @interface HomeTableViewCell : UITableViewCell
    @property (nonatomic, retain) UILabel *nameLabel, *contentLabel;
    自定义cell的优化方法, 对cell上展示的内容, 写一个方法封装起来, 方便赋值
    - (void)showContent:(Joke *)joke;
    + (CGFloat)calculateRowHeight:(Joke *)joke;
    @end
    HomeTableViewCell.m
    #import "HomeTableViewCell.h"
    #import "Joke.h"
    @implementation HomeTableViewCell
    - (void)dealloc {
        [_nameLabel release];
        [_contentLabel release];
        [super dealloc];
    }
    - (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
        self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
        if (self) {
            //姓名
            self.nameLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 10, 355, 20)];
    //        self.nameLabel.backgroundColor = [UIColor colorWithRed:0.658 green:1.000 blue:0.975 alpha:1.000];
            [self.contentView addSubview:_nameLabel];
            [_nameLabel release];
            
            //内容
            self.contentLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 40, 355, 20)];
            self.contentLabel.backgroundColor = [UIColor colorWithRed:1.000 green:0.988 blue:0.889 alpha:1.000];
            self.contentLabel.numberOfLines = 0;
            [self.contentView addSubview:_contentLabel];
            [_contentLabel release];
            
        }
        return self;
    }
    
    - (void)showContent:(Joke *)joke {
        self.nameLabel.text = joke.name;
        self.contentLabel.text = joke.content;
        
        通过内容, 计算高度
        参数1: 展示内容的容器大小(CGSize)
        参数2: 计算方式(行高 + 间距)(NSStringDrawingOptions)
        参数3: 文字样式(文字大小)(NSDictionary *)
        参数4: 传递参数使用(NSStringDrawingContext *)
        NSDictionary *dic = @{NSFontAttributeName: [UIFont systemFontOfSize:17]};
        CGRect rect = [joke.content boundingRectWithSize:CGSizeMake(355, 0) options:(NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading) attributes:dic context:nil];
        CGRect frame = self.contentLabel.frame;
        frame.size.height = rect.size.height;
        self.contentLabel.frame = frame;
        
    }
    
    + (CGFloat)calculateRowHeight:(Joke *)joke {
        NSDictionary *dic = @{NSFontAttributeName: [UIFont systemFontOfSize:17]};
        CGRect rect = [joke.content boundingRectWithSize:CGSizeMake(355, 0) options:(NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading) attributes:dic context:nil];
        return rect.size.height + 20 + 30;
    }
    
    @end
    Joke.h
    #import <Foundation/Foundation.h>
    
    @interface Joke : NSObject
    
    @property (nonatomic, retain) NSString *name, *content;
    
    - (instancetype)initWithName:(NSString *)namae content:(NSString *)content;
    + (instancetype)jokeWithName:(NSString *)namae content:(NSString *)content;
    
    @end
    Joke.m
    #import "Joke.h"
    @implementation Joke
    - (void)dealloc {
        [_name release];
        [_content release];
        [super dealloc];
    }
    
    - (instancetype)initWithName:(NSString *)namae content:(NSString *)content {
        if (self = [super init]) {
            self.name = namae;
            self.content = content;
        }
        return self;
    }
    + (instancetype)jokeWithName:(NSString *)namae content:(NSString *)content {
        return [[Joke alloc] initWithName:namae content:content];
    }
    
    @end
    - (void)creatData {
        Joke *joke1 = [Joke jokeWithName:@"忠忠" content:@"1、毕业后才知道校园恋爱是最纯洁的;2、毕业后才知道学习是最重要的;3、毕业后才知道校园生活是最幸福的;4、毕业后才知道宿舍生活是最好的;5、毕业后才知道食堂的饭菜是最便宜的;6、毕业后才知道上学是最美妙的事。7、毕业后才知道学生花钱最大手大脚......"];
        Joke *joke2 = [Joke jokeWithName:@"老王" content:@"一年奔波,尘缘遇了谁;一句珍重,天涯别了谁;一点灵犀,凭栏忆了谁;一种相思,闲愁予了谁;一江明月,豪情酬了谁;一场冬雪,烟波忘了谁;一壶浊酒,相逢醉了谁;一世浮生,轻狂撩了谁;一封短信,才情念了谁;一番思量,谁是谁的谁 ;一枚围脖,转发回复谁....."];
        Joke *joke3 = [Joke jokeWithName:@"蹦蹦" content:@"人与人间的信任,就像是纸片,一旦破损,就不会再回到原来的样子。"];
        Joke *joke4 = [Joke jokeWithName:@"小强" content:@"记者:说真的,你真的会给给孩子换尿布吗? 姚明:要不你躺下,我给你换一个!实话告诉你,我用一只脚就能给孩子换尿布,喂奶啥的,都行。 记者:我不信! 姚明:真的,连灯都不用开。 记者:不可能!你说怎么换? 姚明:一只脚把媳妇揣醒就得。"];
        Joke *joke5 = [Joke jokeWithName:@"广恩" content:@"一生只谈三次恋爱最好,一次懵懂,一次刻骨,一次一生。谈的太多会比较,无法确定;经历太多会麻木,不再相信爱情,行尸走肉,最后与不爱的人结婚,无法发自内心的爱对方,日常表现的应付,对方则抱怨你不够关心和不顾家,最后这失败的爱情,让你在遗憾和凑合中走完一生。"];
        Joke *joke6 = [Joke jokeWithName:@"歌星" content:@"我们常常看到的风景是:一个人总是仰望和羡慕着别人的幸福,一回头,却发现自己正被仰望和羡慕着。其实,每个人都是幸福的。只是,你的幸福,常常在别人眼里 。"];
        self.jokeArray = [@[joke1, joke2, joke3, joke4, joke5, joke6] mutableCopy];
      
    }
    
    - (void)didReceiveMemoryWarning {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }
    
    #pragma mark - UITableViewDataSource
    
    - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
        // Return the number of sections.
        return 1;
    }
    
    - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
        // Return the number of rows in the section.
        return self.jokeArray.count;
    }
    
    
    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
        static NSString *identifier = @"cell";
        HomeTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
        if (cell == nil) {
            cell = [[HomeTableViewCell alloc] initWithStyle:(UITableViewCellStyleSubtitle) reuseIdentifier:identifier];
        }
    //    cell.textLabel.text = @"Hello World!";
        Joke *joke = _jokeArray[indexPath.row];
        [cell showContent:joke];
        return cell;
    }
    #pragma mark - UITableViewDelegate
    - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
        return [HomeTableViewCell calculateRowHeight:self.jokeArray[indexPath.row]];
    }

     

     

    The one who wants to wear a crown must bear the weight!
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  • 原文地址:https://www.cnblogs.com/OrangesChen/p/4926192.html
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