想嘗試拉加載意識到有多少開始了他的研究之旅，我看了兩天做出最終的界面。

之所以這么慢是由于，我不知道要將上拉出現的view放在哪。就能在scrollView拉究竟部的時候被拉出來。還有就是怎么拉出來之后停在這里。網上下載樣例之后研究了兩天：

先說一下，在以下處理圖片中橘色view的位置的時候用了kvo進行了監聽。

先一個枚舉 來指示眼下刷新view是在哪個狀態：

typedef enum {RefreshStateLoading = 1,//刷新狀態為正在載入RefreshStateRelease, //下拉完畢釋放之前RefreshStateNomal, //原始狀態 }RefreshState;

以下一個類view來描寫敘述刷新view

@interface FootView : UIView@property (nonatomic,strong) UIActivityIndicatorView *activity;//活動指示條 @property (nonatomic,strong) UIImageView *imageView; //箭頭圖片 @property (nonatomic,strong) UILabel *infolabel; //文字指示 @property (nonatomic,assign) RefreshState refreshState; //刷新的狀態- (void)refreshStateLoading; - (void)refreshStateNomal; - (void)refreshStateRelsease;@end
#import "FootView.h"@implementation FootView@synthesize activity; @synthesize imageView; @synthesize infolabel; @synthesize refreshState;- (id)initWithFrame:(CGRect)frame {self = [super initWithFrame:frame];if (self) {self.backgroundColor = [UIColor orangeColor];//活動指示器初始化activity = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];activity.frame = CGRectMake(10, 0, 50, 70);[self addSubview:activity];//箭頭圖片初始化imageView = [[UIImageView alloc]initWithFrame:CGRectMake(10, 10, 30, 50)];imageView.image = [UIImage imageNamed:@"blackArrow.png"];[self addSubview:imageView];//信息label初始化infolabel = [[UILabel alloc]initWithFrame:CGRectMake(100,0 ,100, 70)];infolabel.text = @"下拉刷新...";infolabel.font = [UIFont fontWithName:@"Helvetica" size:20];infolabel.textAlignment = NSTextAlignmentCenter;infolabel.textColor = [UIColor blackColor];[self addSubview:infolabel];//設置初始狀態self.refreshState = RefreshStateNomal;}return self; }//初始狀態 - (void)refreshStateNomal {self.refreshState = RefreshStateNomal;[self.activity stopAnimating];self.infolabel.text = @"下拉載入很多其它...";self.imageView.layer.transform = CATransform3DMakeRotation(M_PI * 2, 0, 0, 1);self.imageView.hidden = NO; }//正在請求數據時 - (void)refreshStateLoading {self.refreshState = RefreshStateLoading;self.imageView.hidden = YES;[UIView beginAnimations:nil context:nil];self.infolabel.text = @"正在載入...";[self.activity startAnimating];[UIView commitAnimations]; }//下拉完畢后 - (void)refreshStateRelsease {self.refreshState = RefreshStateRelease;[UIView beginAnimations:nil context:nil];self.infolabel.text = @"釋放后載入...";self.imageView.layer.transform = CATransform3DMakeRotation(M_PI, 0, 0, 1);[UIView commitAnimations];}@end
以下來寫table

#import <UIKit/UIKit.h>@interface MyTableVC : UITableViewController<UIScrollViewDelegate>@property (nonatomic,strong) NSMutableArray *dataArray;//數據@end
#import "MyTableVC.h" #import "FootView.h"#define TABLE_CELL_HIGHT 50.0@interface MyTableVC ()@end@implementation MyTableVC {FootView *footView; }@synthesize dataArray;- (id)initWithStyle:(UITableViewStyle)style {self = [super initWithStyle:style];if (self) {}return self; }- (void)viewDidLoad {[super viewDidLoad];dataArray = [NSMutableArray arrayWithArray:@[@"列表1",@"列表2",@"列表3",@"列表2",@"列表3",@"列表2",@"列表3",@"列表2",@"列表3",@"列表2",@"列表3",@"列表2",@"列表3",@"列表2",@"列表5"]];[self addPullToRefreshFooter]; }//加入FootView指示器 - (void)addPullToRefreshFooter {//FootView初始化footView = [[FootView alloc]initWithFrame:CGRectMake(0, dataArray.count*50 , 320, 251)];[self.tableView addSubview:footView];//監視數據數組[self addObserver:self forKeyPath:@"dataArray" options:NSKeyValueObservingOptionNew context:nil]; }#pragma mark - Table view data source- (float)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {return TABLE_CELL_HIGHT; }- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {return 1; }- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {return dataArray.count; }- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {static NSString *inditifierCell = @"Cell";UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:inditifierCell];if (cell == nil) {cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:inditifierCell];}cell.textLabel.text = [dataArray objectAtIndex:indexPath.row];return cell; }- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {NSMutableArray *new = [[NSMutableArray alloc]initWithArray:dataArray];[new addObject:@"張三"];self.dataArray = new;[footView refreshStateNomal];self.tableView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0);}#pragma mark - kvo //用于監聽dataArray數組來設置footview的位置 - (void) observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {NSLog(@"%d",dataArray.count);NSMutableArray *mutableArray = [change objectForKey:@"new"];footView.frame = CGRectMake(0,TABLE_CELL_HIGHT* mutableArray.count, 320, 251);[self.tableView reloadData]; }#pragma mark - Scroller//當scroller滑動時調用 - (void) scrollViewDidScroll:(UIScrollView *)scrollView {if (footView.refreshState == RefreshStateNomal&& scrollView.contentOffset.y > scrollView.contentSize.height - scrollView.frame.size.height + 70) {[footView refreshStateRelsease];} }//當滑動結束時調用 - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {if (footView.refreshState == RefreshStateRelease) {[UIView beginAnimations:nil context:nil];self.tableView.contentInset = UIEdgeInsetsMake(0, 0, 70, 0);[footView refreshStateLoading];[UIView commitAnimations];} }@end

在table中處理一些事件：

為了測試加入數據后footview的位置是否會跟著變動。當點擊cell的時候會加入一個數據。

為了測試載入完畢后第二次拖拽是否頁面還可以完畢，當點擊cell的時候foottview會停止；

下載代碼：http://download.csdn.net/detail/u010123208/8036577

版權聲明：本文博主原創文章。博客，未經同意不得轉載。

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