//
//  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tableViewself.tableView = [[UITableView alloc] initWithFrame:self.view.boundsstyle: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_CELLobject:@(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:selfselector:@selector(notificationEvent:)name:DATA_CELLobject: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:selfname:DATA_CELLobject:nil];
}@end