为练手写了一个小的上拉载入很多其它下拉刷新的小的Dome 。
没有太多的技术含量，仅仅是作为新手的启示用。是上一篇下拉载入的扩展。先看一下那个再看这个就easy非常多。
Dome下载：http://download.csdn.net/detail/u010123208/8062715
先来梳理一下：
上拉家在很多其它就是上拉之后在底部现实一个视图，用来提示用户上拉载入很多其它，假设用户上拉就出发事件。进行载入并在试图中给予提示，同一时候后台载入数据，将加入的数据加入数据数组，最后又一次导入列表；
下拉刷新相同的操作，仅仅只是就是将数组清空又一次来导入数据；
首先我们要创建两个view 一个是顶部显示，一个在底部显示 ；
在view中要显示如今文字，一张图片，一个活动指示框（当进行网络请求载入数据的时候显示。其它时候隐藏），假设不太理解下载Dome看一下就知道了。
typedef enum {
InsertStateNomal, //寻常状态
InsertStateDrapUp, //上拉状态
InsertStateDrapDown, //下拉状态
InsertStateRun, //正在载入的状态
}InsertState;
@interface HeadView : UIView
@property (nonatomic,strong) UIImageView *imageView;
@property (nonatomic,strong) UILabel *label;
@property (nonatomic,assign) InsertState insertState;
@property (nonatomic,strong) UIActivityIndicatorView *activity;
- (void)setInsertNomal;
- (void)setInsertDrapDown;
- (void)setInsertRun;
@end
@interface FootView : UIView
@property (nonatomic,strong) UIImageView *imageView;
@property (nonatomic,strong) UILabel *label;
@property (nonatomic,assign) InsertState insertState;
@property (nonatomic,strong) UIActivityIndicatorView *activity;
- (void)setInsertNomal;
- (void)setInsertDrapDoUp;
- (void)setInsertRun;
@end
枚举用来指示视图的当前状态；
事实上两个视图的内容什么的都全然一样；
//
// InsertView.m
// RefreshDome
//
// Created by 小屁孩 on 14-10-16.
// Copyright (c) 2014年 XS. All rights reserved.
//
#import "InsertView.h"
@implementation HeadView
@synthesize imageView;
@synthesize label;
@synthesize insertState;
@synthesize activity;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.backgroundColor = [UIColor orangeColor];
//图片
imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"arrow.png"]];
imageView.frame = CGRectMake(20, frame.size.height-60, 30, 50);
[self addSubview:imageView];
//显示的文字
label = [[UILabel alloc]initWithFrame:CGRectMake(60, frame.size.height-60, 250, 50)];
label.text = @"下拉刷新...";
label.textAlignment = NSTextAlignmentCenter;
[self addSubview:label];
//状态
insertState = InsertStateNomal;
//活动指示器
activity = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
activity.frame = CGRectMake(20,frame.size.height-60, 30, 50);
[self addSubview:activity];
}
return self;
}
//初始状态
-(void)setInsertNomal
{
insertState = InsertStateNomal;
label.text = @"下拉刷新.....";
imageView.layer.transform = CATransform3DMakeRotation(M_PI*2, 0, 0, 1);
[activity stopAnimating];
imageView.hidden =NO;
}
//下拉状态
- (void)setInsertDrapDown
{
insertState = InsertStateDrapDown;
[UIView beginAnimations:nil context:nil];
label.text = @"释放后刷新.....";
imageView.layer.transform = CATransform3DMakeRotation(M_PI, 0, 0, 1);
[UIView commitAnimations];
}
//刷新状态
- (void)setInsertRun
{
insertState =InsertStateRun;
label.text = @"正在刷新.....";
imageView.hidden = YES;
[activity startAnimating];
}
@end
@implementation FootView
@synthesize imageView;
@synthesize label;
@synthesize insertState;
@synthesize activity;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.backgroundColor = [UIColor orangeColor];
//图片
imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"arrow.png"]];
imageView.layer.transform = CATransform3DMakeRotation(M_PI , 0, 0, 1);
imageView.frame = CGRectMake(20, 10, 30, 50);
[self addSubview:imageView];
//文字
label = [[UILabel alloc]initWithFrame:CGRectMake(60, 10, 250, 50)];
label.text = @"上拉载入很多其它.....";
label.textAlignment = NSTextAlignmentCenter;
[self addSubview:label];
//状态
insertState = InsertStateNomal;
//活动指示器
activity = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
activity.frame = CGRectMake(20, 10, 30, 50);
[self addSubview:activity];
}
return self;
}
//初始状态
- (void)setInsertNomal
{
insertState = InsertStateNomal;
label.text = @"上拉载入很多其它.....";
imageView.layer.transform = CATransform3DMakeRotation(M_PI , 0, 0, 1);
[activity stopAnimating];
imageView.hidden =NO;
}
//上拉状态
- (void)setInsertDrapDoUp
{
insertState = InsertStateDrapUp;
[UIView beginAnimations:nil context:nil];
label.text = @"释放后载入很多其它.....";
imageView.layer.transform = CATransform3DMakeRotation(M_PI * 2, 0, 0, 1);
[UIView commitAnimations];
}
//载入状态
- (void)setInsertRun
{
insertState = InsertStateRun;
label.text = @"正在载入.....";
imageView.hidden = YES;
[activity startAnimating];
}
@end
最后就是列表了；
事实上在这里面须要注意的：
- 要如何为表格加入视图
- 加入的底部视图随着内容的增多，是不断变化的（这里我用了KVO来控制，当数组元素变化后处理位置）
- 当完毕下拉或者上拉的时候。短暂的视图显示怎么来控制
- 上拉下拉的推断（UIScrollview代理）条件；
#import <UIKit/UIKit.h>
#import "InsertView.h"
@interface ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate,UIScrollViewDelegate>
@property (weak, nonatomic) IBOutlet UITableView *table;
@property (nonatomic,strong) NSMutableArray *tableArray;
@end
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
{
HeadView *headView;
FootView *footView;
}
@synthesize tableArray;
@synthesize table;
- (void)viewDidLoad
{
[super viewDidLoad];
table.frame = CGRectMake(0, 20, 320, [[UIScreen mainScreen]bounds].size.height-20);
table.delegate = self;
table.dataSource = self;
table.tableFooterView = [[UIView alloc]init];
//下拉头部视图
headView = [[HeadView alloc]initWithFrame:CGRectMake(0, -251, DEVICE_FRAME.size.width, 251)];
[table addSubview:headView];
//上拉底部视图
footView = [[FootView alloc]initWithFrame:CGRectMake(0, table.frame.size.height, DEVICE_FRAME.size.width, 251)];
[table addSubview:footView];
//初始化数组
tableArray = [NSMutableArray array];
for (int i = 0; i<15; i++) {
NSURL *url=[NSURL URLWithString:@"http://www.sinaimg.cn/qc/photo_auto/chezhan/2012/50/00/15/80046_950.jpg"];
UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:url]];
[tableArray addObject:image];
}
float hight =tableArray.count * 60 ;
if (tableArray.count * 60 < [[UIScreen mainScreen]bounds].size.height ) {
hight = table.frame.size.height;
}
footView.frame = CGRectMake(0, hight, 320, 251);
[self addObserver:self forKeyPath:@"tableArray" options:NSKeyValueObservingOptionNew context:nil];
}
- (void) addtableMutableArray
{
for (int i = 0; i<5; i++) {
NSURL *url=[NSURL URLWithString:@"http://www.sinaimg.cn/qc/photo_auto/chezhan/2012/50/00/15/80046_950.jpg"];
UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:url]];
[self.tableArray addObject:image];
}
self.tableArray = tableArray;
[footView setInsertNomal];
[self performSelectorOnMainThread:@selector(endThread) withObject:nil waitUntilDone:NO];
}
- (void)endThread
{
[UIView beginAnimations:nil context:nil];
table.contentInset = UIEdgeInsetsMake(0, 0, 0, 0);
[UIView commitAnimations];
[table reloadData];
NSLog(@"%d",tableArray.count);
}
- (void) refesh
{
NSMutableArray *array = [NSMutableArray array];
for (int i = 0; i<15; i++) {
NSURL *url=[NSURL URLWithString:@"http://wenwen.sogou.com/p/20110923/20110923201826-1347223277.jpg"];
UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:url]];
[array addObject:image];
}
self.tableArray = array;
[headView setInsertNomal];
[self performSelectorOnMainThread:@selector(endThread) withObject:nil waitUntilDone:NO];
}
#pragma mark KVO
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
NSMutableArray *array = [change objectForKey:@"new"];
float hight =array.count * 60;
if (array.count * 60 < [[UIScreen mainScreen]bounds].size.height ) {
hight = [[UIScreen mainScreen]bounds].size.height;
}
footView.frame = CGRectMake(0, hight, 320, 251);
}
#pragma mark tabledelegate
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return tableArray.count;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 60;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *identityCell = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identityCell];
if (cell == nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identityCell];
}
cell.imageView.image = [tableArray objectAtIndex:indexPath.row];
cell.textLabel.text = @"NibBi";
return cell;
}
#pragma mark - scrolldelegae
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
if (headView.insertState == InsertStateDrapDown) {
[UIView beginAnimations:nil context:nil];
table.contentInset = UIEdgeInsetsMake(70, 0, 0, 0);
[headView setInsertRun];
[UIView commitAnimations];
[self performSelectorInBackground:@selector(refesh) withObject:nil];
}
if (footView.insertState == InsertStateDrapUp) {
[UIView beginAnimations:nil context:nil];
table.contentInset = UIEdgeInsetsMake(0, 0, 70, 0);
[footView setInsertRun];
[UIView commitAnimations];
[self performSelectorInBackground:@selector(addtableMutableArray) withObject:nil];
}
}
-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
// NSLog(@"%f",scrollView.contentOffset.y);
//上拉载入很多其它转换
if (scrollView.contentOffset.y > scrollView.contentSize.height - scrollView.frame.size.height + 60 && footView.insertState == InsertStateNomal) {
[UIView beginAnimations:nil context:nil];
[footView setInsertDrapDoUp];
[UIView commitAnimations];
}
//下拉刷新转换
if (scrollView.contentOffset.y < -60 && headView.insertState == InsertStateNomal)
{
[UIView beginAnimations:nil context:nil];
[headView setInsertDrapDown];
[UIView commitAnimations];
}
}
@end
本文转自mfrbuaa博客园博客，原文链接：http://www.cnblogs.com/mfrbuaa/p/5099195.html，如需转载请自行联系原作者
