UITableView底部FooterView实现上拉刷新

转载自:http://carlme.blog.163.com/blog/static/183716327201272421728204/

@interface FooterViewTestViewController : UIViewController <UITableViewDataSource, UITableViewDelegate>{

// 表格数据数组，因为是演示代码，直接定义为数组
NSMutableArray *tableData;

// 下拉时显示的数据
NSMutableArray *tableMoreData;

// 数据数量
NSUInteger dataNumber;

// 加载状态
BOOL _loadingMore;

UITableView *table;
}

@property (nonatomic, retain) UITableView *table;
@property (nonatomic, retain) NSMutableArray *tableData;
@property (nonatomic, retain) NSMutableArray *tableMoreData;

// 创建表格底部
- (void) createTableFooter;

// 开始加载数据
- (void) loadDataBegin;

// 加载数据中
- (void) loadDataing;

// 加载数据完毕
- (void) loadDataEnd;

@end

@implementation FooterViewTestViewController

@synthesize table;
@synthesize tableData;
@synthesize tableMoreData;

- (void)viewDidLoad {

    [super viewDidLoad];

　　table = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 320, 460) style:UITableViewStylePlain];
　　table.delegate = self;
　　table.dataSource = self;
　　[self.view addSubview:table];

　　tableData = [[NSMutableArray alloc] initWithObjects:
@"January",@"February",@"March",@"April",@"May",@"June",
@"July",@"August",@"September",@"October",@"November",@"December",nil];

　　tableMoreData = [[NSMutableArray alloc] initWithObjects:@"BAIDU",@"GOOGLE",@"FACEBOOK",@"YAHOO",nil];
　　[self createTableFooter];
}

#pragma mark -
#pragma mark Table view data source
// Customize the number of sections in the table view.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return [tableData count];
}

// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }

　　cell.textLabel.text = [tableData objectAtIndex:indexPath.row];
    return cell;
}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
    // 下拉到最底部时显示更多数据
　　if(!_loadingMore && scrollView.contentOffset.y > ((scrollView.contentSize.height - scrollView.frame.size.height)))
　　{
　　　　[self loadDataBegin];
　　}
}

// 开始加载数据
- (void) loadDataBegin{
    if (_loadingMore == NO)
    {
        _loadingMore = YES;

        UIActivityIndicatorView *tableFooterActivityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(75.0f, 10.0f, 20.0f, 20.0f)];
        [tableFooterActivityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleGray];
        [tableFooterActivityIndicator startAnimating];
        [self.table.tableFooterView addSubview:tableFooterActivityIndicator];

　　　　[self loadDataing];

    }
}

// 加载数据中
- (void) loadDataing
{
　　dataNumber = [tableData count];
　　for (int x = 0; x < [tableMoreData count]; x++)
　　{
　　　　[tableData addObject:[tableMoreData objectAtIndex:x]];
　　}

　　[[self table] reloadData];
　　[self loadDataEnd];
}

// 加载数据完毕
- (void) loadDataEnd{
　　_loadingMore = NO;
　　[self createTableFooter];
}

// 创建表格底部
- (void) createTableFooter{

    self.table.tableFooterView = nil;
    UIView *tableFooterView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, self.table.bounds.size.width, 40.0f)];
    UILabel *loadMoreText = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 116.0f, 40.0f)];
    [loadMoreText setCenter:tableFooterView.center];
    [loadMoreText setFont:[UIFont fontWithName:@"Helvetica Neue" size:14]];
    [loadMoreText setText:@"上拉显示更多数据"];
    [tableFooterView addSubview:loadMoreText];    

    self.table.tableFooterView = tableFooterView;
}

@end