ios 上拉載入下拉重新整理Dome

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為練手寫了一個小的上拉載入更多下拉重新整理的小的Dome 。

沒有太多的技術含量，只是作為新手的啟發用。是上一篇下拉載入的擴充。先看一下那個再看這個就容易很多。

Dome下載：http://download.csdn.net/detail/u010123208/8062715

先來梳理一下：

上拉家在更多就是上拉之後在底部現實一個視圖，用來提示使用者上拉載入更多，如果使用者上拉就出發事件，進行載入並在試圖中給予提示，同時後台載入資料，將添加的資料加入資料數組，最後重新匯入列表；

下拉重新整理同樣的操作，只不過就是將數組清空重新來匯入資料；

首先我們要建立兩個view 一個是頂部顯示，一個在底部顯示 ；

在view中要顯示現在文字，一張圖片，一個活動指示框（當進行網路請求載入資料的時候顯示，其他時候隱藏），如果不太理解下載Dome看一下就知道了。

typedef enum {    InsertStateNomal,    //平常狀態    InsertStateDrapUp,   //上拉狀態    InsertStateDrapDown, //下拉狀態    InsertStateRun,      //正在載入的狀態}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

枚舉用來指示視圖的目前狀態；

其實兩個視圖的內容什麼的都完全一樣；

////  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];        //圖片        imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"arrow.png"]];        imageView.frame = CGRectMake(20, frame.size.height-60, 30, 50);        [self addSubview:imageView];                //顯示的文字        label = [[UILabel alloc]initWithFrame:CGRectMake(60, frame.size.height-60, 250, 50)];        label.text = @"下拉重新整理...";        label.textAlignment = NSTextAlignmentCenter;        [self addSubview:label];                //狀態        insertState = InsertStateNomal;                //活動指標        activity = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];        activity.frame = CGRectMake(20,frame.size.height-60, 30, 50);        [self addSubview:activity];    }    return self;}//初始狀態-(void)setInsertNomal{    insertState = InsertStateNomal;    label.text = @"下拉重新整理.....";    imageView.layer.transform = CATransform3DMakeRotation(M_PI*2, 0, 0, 1);    [activity stopAnimating];    imageView.hidden =NO;}//下拉狀態- (void)setInsertDrapDown{    insertState = InsertStateDrapDown;    [UIView beginAnimations:nil context:nil];    label.text = @"釋放後重新整理.....";    imageView.layer.transform = CATransform3DMakeRotation(M_PI, 0, 0, 1);    [UIView commitAnimations];    }//重新整理狀態- (void)setInsertRun{    insertState =InsertStateRun;    label.text = @"正在重新整理.....";    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];        //圖片        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 = @"上拉載入更多.....";        label.textAlignment = NSTextAlignmentCenter;        [self addSubview:label];                //狀態        insertState = InsertStateNomal;                //活動指標        activity = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];        activity.frame = CGRectMake(20, 10, 30, 50);        [self addSubview:activity];    }    return self;}//初始狀態- (void)setInsertNomal{    insertState = InsertStateNomal;    label.text = @"上拉載入更多.....";    imageView.layer.transform = CATransform3DMakeRotation(M_PI , 0, 0, 1);    [activity stopAnimating];    imageView.hidden =NO;}//上拉狀態- (void)setInsertDrapDoUp{    insertState = InsertStateDrapUp;    [UIView beginAnimations:nil context:nil];    label.text = @"釋放後載入更多.....";    imageView.layer.transform = CATransform3DMakeRotation(M_PI * 2, 0, 0, 1);    [UIView commitAnimations];}//載入狀態- (void)setInsertRun{    insertState = InsertStateRun;    label.text = @"正在載入.....";    imageView.hidden = YES;    [activity startAnimating];}@end

最後就是列表了；

其實在這裡面需要注意的：

• 要怎樣為表格添加視圖
• 添加的底部視圖隨著內容的增多，是不斷變化的（這裡我用了KVO來控制，當數組元素變化後處理位置）
• 當完成下拉或者上拉的時候，短暫的視圖顯示怎麼來控制
• 上拉下拉的判斷（UIScrollview代理）條件；

#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];        //下拉頭部視圖    headView = [[HeadView alloc]initWithFrame:CGRectMake(0, -251, DEVICE_FRAME.size.width, 251)];    [table addSubview:headView];        //上拉底部視圖    footView = [[FootView alloc]initWithFrame:CGRectMake(0, table.frame.size.height, DEVICE_FRAME.size.width, 251)];    [table addSubview:footView];        //初始化數組    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);    //上拉載入更多轉換    if (scrollView.contentOffset.y > scrollView.contentSize.height - scrollView.frame.size.height + 60 && footView.insertState == InsertStateNomal) {        [UIView beginAnimations:nil context:nil];        [footView setInsertDrapDoUp];        [UIView commitAnimations];            }    //下拉重新整理轉換    if (scrollView.contentOffset.y < -60 && headView.insertState == InsertStateNomal)    {        [UIView beginAnimations:nil context:nil];        [headView setInsertDrapDown];        [UIView commitAnimations];    }}@end

ios 上拉載入下拉重新整理Dome