[ZT]UITableView下拉刷新页面的实现

UITableView下拉刷新页面的实现

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以前看到facebook,人人和其他的一些应用,很多都使用了下拉列表,列表就重新加载数据的应用.感觉用户体验很好,但是一直没有时间找相应的解决方法,今天终于有时间整理一下代码:

下图是实现的效果图,当用户下拉列表的时候,就出现向上的箭头.

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实现的开源框架是:https://github.com/enormego/EGOTableViewPullRefresh

实现过程很简单,下载相应的demo,然后拷贝资源文件和EGORefreshTableHeaderView.h和EGORefreshTableHeaderView.m到相依的工程中.在table所在的类中添加如下代码:

#import <UIKit/UIKit.h>?
#import "EGORefreshTableHeaderView.h"?
@interface?iphone_navtaViewController : UIViewController?
<UITableViewDelegate,UITableViewDataSource,EGORefreshTableHeaderDelegate>{?
??? BOOL isflage;?
??? IBOutlet UITableView *myTableView;?
???EGORefreshTableHeaderView *_refreshHeaderView;?
??? BOOL _reloading;?
}?
@property (nonatomic,retain) UITableView *myTableView;?
- (void)reloadTableViewDataSource;?
- (void)doneLoadingTableViewData;?
@end

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实现方法：

#import "iphone_navtaViewController.h"?
@implementation iphone_navtaViewController?
@synthesize myTableView;?
- (void)viewDidLoad {?
??? [super viewDidLoad];?
??? if (_refreshHeaderView == nil) {?
??????? EGORefreshTableHeaderView *view1 = [[EGORefreshTableHeaderView alloc] initWithFrame:CGRectMake(0.0f, 10.0f – self.myTableView.bounds.size.height, self.myTableView.frame.size.width, self.view.bounds.size.height)];?
??????? view1.delegate = self;?
??????? [self.myTableView addSubview:view1];?
??????? _refreshHeaderView = view1;?
??????? [view1 release];?
??? }?
??? [_refreshHeaderView refreshLastUpdatedDate];?
}?
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {?
??? return (interfaceOrientation == UIInterfaceOrientationPortrait);?
}?
- (void)didReceiveMemoryWarning {?
??? [super didReceiveMemoryWarning];?
}?
- (void)viewDidUnload {?
??? self.myTableView=nil;?
??? _refreshHeaderView=nil;?
}?
- (void)dealloc {?
??? _refreshHeaderView=nil;?
??? [self.myTableView release];?
??? [super dealloc];?
}?
#pragma mark –?
#pragma mark onClick?
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event?
{?
????? isflage=!isflage;?
??? [super.navigationController setNavigationBarHidden:isflage animated:TRUE];?
??? [super.navigationController setToolbarHidden:isflage animated:TRUE];?
}?
#pragma mark –?
#pragma mark UITableView?
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {?
??? return 1;?
}?
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {?
??? return 3;?
}?
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {?
??? UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"tag"];?
??? if (cell==nil) {?
??????? cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle?
?????????????????????????????????????? reuseIdentifier:@"tag"] autorelease];?
??? }?
??? //表格设计?
??? return cell;?
}?
-(CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath?
{?
??? return 100;?
}

#pragma mark –?
#pragma mark Data Source Loading / Reloading Methods

- (void)reloadTableViewDataSource{?
??? NSLog(@"==开始加载数据");?
??? _reloading = YES;?
}

- (void)doneLoadingTableViewData{?
??? NSLog(@"===加载完数据");?
??? _reloading = NO;?
??? [_refreshHeaderView egoRefreshScrollViewDataSourceDidFinishedLoading:self.myTableView];
}?
#pragma mark –?
#pragma mark UIScrollViewDelegate Methods?
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{????
??? [_refreshHeaderView egoRefreshScrollViewDidScroll:scrollView];?
}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{?
??? [_refreshHeaderView egoRefreshScrollViewDidEndDragging:scrollView];?
}?
#pragma mark –?
#pragma mark EGORefreshTableHeaderDelegate Methods?
- (void)egoRefreshTableHeaderDidTriggerRefresh:(EGORefreshTableHeaderView*)view{?
??? [self reloadTableViewDataSource];?
??? [self performSelector:@selector(doneLoadingTableViewData) withObject:nil afterDelay:3.0];?
}

- (BOOL)egoRefreshTableHeaderDataSourceIsLoading:(EGORefreshTableHeaderView*)view{?
??? return _reloading;?
}?
- (NSDate*)egoRefreshTableHeaderDataSourceLastUpdated:(EGORefreshTableHeaderView*)view{?
??? return [NSDate date];?????
}?
@end

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一个最重要的步骤，就是要添加QuartzCore.framework组建。

然后运行即可。