用TableView写带特效的cell

//
//  ViewController.m
//  TableView
//
//  Created by XianMingYou on 15/4/9.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import "ViewController.h"
#import "DataCell.h"



@interface ViewController ()<UITableViewDelegate, UITableViewDataSource>

@property (nonatomic, strong) UITableView *tableView;
@property (nonatomic, strong) NSArray     *dataSource;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    // 数据源
    self.dataSource = @[@"YouXianMing", @"Google",
                        @"iOS Developer", @"Android Developer", @"YouTube",
                        @"UI Delveloper", @"PS4 Player", @"XboxOne Player"];
    
    // 初始化tableView
    self.tableView = [[UITableView alloc] initWithFrame:self.view.bounds
                                                  style:UITableViewStylePlain];
    self.tableView.delegate       = self;
    self.tableView.dataSource     = self;
    self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
    [self.tableView registerClass:[DataCell class] forCellReuseIdentifier:DATA_CELL];
    [self.view addSubview:self.tableView];
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    // 发送广播
    [[NSNotificationCenter defaultCenter] postNotificationName:DATA_CELL
                                                        object:@(scrollView.contentOffset.y)
                                                      userInfo:nil];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return self.dataSource.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    DataCell *cell  = [tableView dequeueReusableCellWithIdentifier:DATA_CELL];
    cell.indexPath  = indexPath;
    cell.label.text = self.dataSource[indexPath.row];
    
    return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return CELL_HEIGHT;
}

@end

//
//  DataCell.h
//  TableView
//
//  Created by XianMingYou on 15/4/9.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import <UIKit/UIKit.h>

#define  DATA_CELL    @"DataCell"
#define  CELL_HEIGHT  (56.8f * 2)


@interface DataCell : UITableViewCell

@property (nonatomic, strong) NSIndexPath  *indexPath;
@property (nonatomic, strong) UILabel      *label;

@end

//
//  DataCell.m
//  TableView
//
//  Created by XianMingYou on 15/4/9.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import "DataCell.h"
#import "UIView+SetRect.h"


@interface DataCell ()
@property (nonatomic, strong) UIView *blackView;
@end


@implementation DataCell

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
    if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
        
        self.selectionStyle  = UITableViewCellSelectionStyleNone;
        
        // 注册通知中心
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(notificationEvent:)
                                                     name:DATA_CELL
                                                   object:nil];
        
        // 构建子控件
        [self buildViews];
    }
    
    return self;
}

- (void)buildViews {
    self.label      = [[UILabel alloc] initWithFrame:CGRectMake(30, 0, 300, CELL_HEIGHT)];
    self.label.font = [UIFont fontWithName:@"Avenir-BookOblique" size:30.f];
    [self addSubview:self.label];
    
    self.blackView = [[UIView alloc] initWithFrame:CGRectMake(10 + 50, 80, 150, 2)];
    self.blackView.backgroundColor = [UIColor blackColor];
    [self addSubview:self.blackView];
}

- (void)notificationEvent:(id)sender {
    
    NSDictionary *data    = sender;
    CGFloat       offsetY = [[data valueForKey:@"object"] floatValue] - self.indexPath.row * CELL_HEIGHT;
    
    if (offsetY >= 0 && offsetY <= CELL_HEIGHT) {
        // 根据百分比计算
        CGFloat percent  = 1 - offsetY / CELL_HEIGHT;
        
        // 设置值
        self.label.alpha = percent;
        self.blackView.x = 10 + percent * 50;
        
    } else if (offsetY >= - CELL_HEIGHT * 5 && offsetY <= - CELL_HEIGHT * 4) {
        // 根据百分比计算
        CGFloat percent  = (offsetY + CELL_HEIGHT) / CELL_HEIGHT + 4;
        
        // 设置值
        self.label.alpha = percent;
        self.blackView.x = 10 + 50 + (1 - percent) * 50;
    } else {
        // 复位
        self.label.alpha = 1.f;
        self.blackView.x = 10 + 50;
    }
}

- (void)dealloc {
    // 移除通知中心
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:DATA_CELL
                                                  object:nil];
}

@end