用TableView写带特效的cell
效果：
源码地址：
https://github.com/YouXianMing/UI-Component-Collection
分析：
在UIScrollView中的代理中发送广播，然后在cell中接收广播
对每一个cell进行设置
对开发有利的一种小细节：
核心源码：
控制器源码
//
// 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
cell源码
//
// 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(, , , CELL_HEIGHT)];
self.label.font = [UIFont fontWithName:@"Avenir-BookOblique" size:.f];
[self addSubview:self.label]; self.blackView = [[UIView alloc] initWithFrame:CGRectMake( + , , , )];
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 >= && offsetY <= CELL_HEIGHT) {
// 根据百分比计算
CGFloat percent = - offsetY / CELL_HEIGHT; // 设置值
self.label.alpha = percent;
self.blackView.x = + percent * ; } else if (offsetY >= - CELL_HEIGHT * && offsetY <= - CELL_HEIGHT * ) {
// 根据百分比计算
CGFloat percent = (offsetY + CELL_HEIGHT) / CELL_HEIGHT + ; // 设置值
self.label.alpha = percent;
self.blackView.x = + + ( - percent) * ;
} else {
// 复位
self.label.alpha = .f;
self.blackView.x = + ;
}
} - (void)dealloc {
// 移除通知中心
[[NSNotificationCenter defaultCenter] removeObserver:self
name:DATA_CELL
object:nil];
} @end