UIScrollView UITableView 上提刷新代码

参考来自：http://www.cocoachina.com/iphonedev/sdk/2011/0525/2885.html

下面是.h文件的代码

//
//  EGORefreshTableHeaderView.h
//  Demo
//
//  Created by Devin Doty on 10/14/09October14.
//  Copyright 2009 enormego. All rights reserved.
//


#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>

typedef enum{
    EGOOPullRefreshPulling = 0,
    EGOOPullRefreshNormal,
    EGOOPullRefreshLoading,    
} EGOPullRefreshState;

@protocol EGORefreshTableHeaderDelegate;
@interface EGORefreshTableHeaderView : UIView {
    
    id _delegate;
    EGOPullRefreshState _state;

    UILabel *_lastUpdatedLabel;
    UILabel *_statusLabel;
    CALayer *_arrowImage;
    UIActivityIndicatorView *_activityView;
    

}

@property(nonatomic,assign) id <EGORefreshTableHeaderDelegate> delegate;

- (void)refreshLastUpdatedDate;
- (void)egoRefreshScrollViewDidScroll:(UIScrollView *)scrollView;
- (void)egoRefreshScrollViewDidEndDragging:(UIScrollView *)scrollView;
- (void)egoRefreshScrollViewDataSourceDidFinishedLoading:(UIScrollView *)scrollView;

@end
@protocol EGORefreshTableHeaderDelegate
- (void)egoRefreshTableHeaderDidTriggerRefresh:(EGORefreshTableHeaderView*)view;
- (BOOL)egoRefreshTableHeaderDataSourceIsLoading:(EGORefreshTableHeaderView*)view;
@optional
- (NSDate*)egoRefreshTableHeaderDataSourceLastUpdated:(EGORefreshTableHeaderView*)view;
@end

下面是.m文件的代码

//
//  EGORefreshTableHeaderView.m
//  Demo
//
//修改人：禚来强 iphone开发qq群：79190809 邮箱：zhuolaiqiang@gmail.com
//


#define  RefreshViewHight 65.0f

#import "EGORefreshTableHeaderView.h"


#define TEXT_COLOR     [UIColor colorWithRed:87.0/255.0 green:108.0/255.0 blue:137.0/255.0 alpha:1.0]
#define FLIP_ANIMATION_DURATION 0.18f


@interface EGORefreshTableHeaderView (Private)
- (void)setState:(EGOPullRefreshState)aState;
@end

@implementation EGORefreshTableHeaderView

@synthesize delegate=_delegate;


- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame: frame];
    if (self) {
        
        self.autoresizingMask = UIViewAutoresizingFlexibleWidth;
        self.backgroundColor = [UIColor colorWithRed:226.0/255.0 green:231.0/255.0 blue:237.0/255.0 alpha:1.0];

        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, RefreshViewHight - 30.0f, self.frame.size.width, 20.0f)];
        label.autoresizingMask = UIViewAutoresizingFlexibleWidth;
        label.font = [UIFont systemFontOfSize:12.0f];
        label.textColor = TEXT_COLOR;
        label.shadowColor = [UIColor colorWithWhite:0.9f alpha:1.0f];
        label.shadowOffset = CGSizeMake(0.0f, 1.0f);
        label.backgroundColor = [UIColor clearColor];
        label.textAlignment = UITextAlignmentCenter;
        [self addSubview:label];
        _lastUpdatedLabel=label;
        [label release];
        
        label = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, RefreshViewHight - 48.0f, self.frame.size.width, 20.0f)];
        label.autoresizingMask = UIViewAutoresizingFlexibleWidth;
        label.font = [UIFont boldSystemFontOfSize:13.0f];
        label.textColor = TEXT_COLOR;
        label.shadowColor = [UIColor colorWithWhite:0.9f alpha:1.0f];
        label.shadowOffset = CGSizeMake(0.0f, 1.0f);
        label.backgroundColor = [UIColor clearColor];
        label.textAlignment = UITextAlignmentCenter;
        [self addSubview:label];
        _statusLabel=label;
        [label release];
        
        CALayer *layer = [CALayer layer];
        layer.frame = CGRectMake(25.0f, RefreshViewHight - RefreshViewHight, 30.0f, 55.0f);
        layer.contentsGravity = kCAGravityResizeAspect;
        layer.contents = (id)[UIImage imageNamed:@"blueArrow.png"].CGImage;
        
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
        if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
            layer.contentsScale = [[UIScreen mainScreen] scale];
        }
#endif
        
        [[self layer] addSublayer:layer];
        _arrowImage=layer;
        
        UIActivityIndicatorView *view = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
        view.frame = CGRectMake(25.0f, RefreshViewHight - 38.0f, 20.0f, 20.0f);
        [self addSubview:view];
        _activityView = view;
        [view release];
        
        
        [self setState:EGOOPullRefreshNormal];
        
    }
    
    return self;
    
}

//
//  EGORefreshTableHeaderView.h
//  Demo
//
//  Created by Devin Doty on 10/14/09October14.
//  Copyright 2009 enormego. All rights reserved.
//
//修改人：禚来强 iphone开发qq群：79190809 邮箱：zhuolaiqiang@gmail.com
//原文地址：http://blog.csdn.net/diyagoanyhacker/archive/2011/05/24/6441805.aspx
#pragma mark -
#pragma mark Setters

- (void)refreshLastUpdatedDate {
    
    if ([_delegate respondsToSelector:@selector(egoRefreshTableHeaderDataSourceLastUpdated:)]) {
        
        NSDate *date = [_delegate egoRefreshTableHeaderDataSourceLastUpdated:self];
        
        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
        [formatter setAMSymbol:@"上午"];
        [formatter setPMSymbol:@"下午"];
        [formatter setDateFormat:@"yyyy/MM/dd hh:mm:a"];
        _lastUpdatedLabel.text = [NSString stringWithFormat:@"最后更新: %@", [formatter stringFromDate:date]];
        
        [[NSUserDefaults standardUserDefaults] setObject:_lastUpdatedLabel.text forKey:@"EGORefreshTableView_LastRefresh"];
        [[NSUserDefaults standardUserDefaults] synchronize];
        [formatter release];
        
    } else {
        
        _lastUpdatedLabel.text = nil;
        
    }

}

- (void)setState:(EGOPullRefreshState)aState{
    
    switch (aState) {
        case EGOOPullRefreshPulling:
            
            _statusLabel.text = NSLocalizedString(@"松开即可更新...", @"松开即可更新...");
            [CATransaction begin];
            [CATransaction setAnimationDuration:FLIP_ANIMATION_DURATION];
            _arrowImage.transform = CATransform3DMakeRotation((M_PI / 180.0) * 180.0f, 0.0f, 0.0f, 1.0f);
            [CATransaction commit];
            
            break;
        case EGOOPullRefreshNormal:
            
            if (_state == EGOOPullRefreshPulling) {
                [CATransaction begin];
                [CATransaction setAnimationDuration:FLIP_ANIMATION_DURATION];
                _arrowImage.transform = CATransform3DIdentity;
                [CATransaction commit];
            }
            
            _statusLabel.text = NSLocalizedString(@"上拉即可更新...", @"上拉即可更新...");
            [_activityView stopAnimating];
            [CATransaction begin];
            [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
            _arrowImage.hidden = NO;
            _arrowImage.transform = CATransform3DIdentity;
            [CATransaction commit];
            
            [self refreshLastUpdatedDate];
            
            break;
        case EGOOPullRefreshLoading:
            
            _statusLabel.text = NSLocalizedString(@"加载中...", @"加载中...");
            [_activityView startAnimating];
            [CATransaction begin];
            [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
            _arrowImage.hidden = YES;
            [CATransaction commit];
            
            break;
        default:
            break;
    }
    
    _state = aState;
}


#pragma mark -
#pragma mark ScrollView Methods

//手指屏幕上不断拖动调用此方法
- (void)egoRefreshScrollViewDidScroll:(UIScrollView *)scrollView {    
    
    if (_state == EGOOPullRefreshLoading) {
        
        CGFloat offset = MAX(scrollView.contentOffset.y * -1, 0);
        offset = MIN(offset, 60);
        scrollView.contentInset = UIEdgeInsetsMake(0.0, 0.0f, RefreshViewHight, 0.0f);
        
    } else if (scrollView.isDragging) {
        
        BOOL _loading = NO;
        if ([_delegate respondsToSelector:@selector(egoRefreshTableHeaderDataSourceIsLoading:)]) {
            _loading = [_delegate egoRefreshTableHeaderDataSourceIsLoading:self];
        }
        
        if (_state == EGOOPullRefreshPulling && scrollView.contentOffset.y + (scrollView.frame.size.height) < scrollView.contentSize.height + RefreshViewHight && scrollView.contentOffset.y > 0.0f && !_loading) {
            [self setState:EGOOPullRefreshNormal];
        } else if (_state == EGOOPullRefreshNormal && scrollView.contentOffset.y + (scrollView.frame.size.height) > scrollView.contentSize.height + RefreshViewHight  && !_loading) {
            [self setState:EGOOPullRefreshPulling];
        }
        
        if (scrollView.contentInset.bottom != 0) {
            scrollView.contentInset = UIEdgeInsetsZero;
        }
        
    }
    
}

//当用户停止拖动，并且手指从屏幕中拿开的的时候调用此方法
- (void)egoRefreshScrollViewDidEndDragging:(UIScrollView *)scrollView {
    
    BOOL _loading = NO;
    if ([_delegate respondsToSelector:@selector(egoRefreshTableHeaderDataSourceIsLoading:)]) {
        _loading = [_delegate egoRefreshTableHeaderDataSourceIsLoading:self];
    }
    
    if (scrollView.contentOffset.y + (scrollView.frame.size.height) > scrollView.contentSize.height + RefreshViewHight && !_loading) {
        
        if ([_delegate respondsToSelector:@selector(egoRefreshTableHeaderDidTriggerRefresh:)]) {
            [_delegate egoRefreshTableHeaderDidTriggerRefresh:self];
        }
        
        [self setState:EGOOPullRefreshLoading];
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:0.2];
        scrollView.contentInset = UIEdgeInsetsMake(0.0f, 0.0f, RefreshViewHight, 0.0f);
        [UIView commitAnimations];
        
    }
    
}

//当开发者页面页面刷新完毕调用此方法，[delegate egoRefreshScrollViewDataSourceDidFinishedLoading: scrollView];
- (void)egoRefreshScrollViewDataSourceDidFinishedLoading:(UIScrollView *)scrollView {    
    
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:.3];
    [scrollView setContentInset:UIEdgeInsetsMake(0.0f, 0.0f, 0.0f, 0.0f)];
    [UIView commitAnimations];
    
    [self setState:EGOOPullRefreshNormal];

}


#pragma mark -
#pragma mark Dealloc

- (void)dealloc {
    
    _delegate=nil;
    _activityView = nil;
    _statusLabel = nil;
    _arrowImage = nil;
    _lastUpdatedLabel = nil;
    [super dealloc];
}


@end

下面是调用类的代码

//
//  RootViewController.m
//  TableViewPull
//
//  Created by Devin Doty on 10/16/09October16.
//  Copyright enormego 2009. All rights reserved.
//
//修改：禚来强 email：zhuolaiqiang@gmail.com

#import "RootViewController.h"

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self.tableView reloadData];
    
    //self.tableView.contentInset = UIEdgeInsetsMake(200, 0, 320, 480);
    
    if (_refreshHeaderView == nil) {
        
        EGORefreshTableHeaderView *view = [[EGORefreshTableHeaderView alloc] initWithFrame: CGRectMake(0.0f, self.tableView.contentSize.height, 320, 650)];
        NSLog(@"%@", NSStringFromCGRect( view.frame ));
        view.delegate = self;
        [self.tableView addSubview:view];
        _refreshHeaderView = view;
        [view release];
        
    }
    
    //  update the last update date
    [_refreshHeaderView refreshLastUpdatedDate];

    
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;
}


#pragma mark -
#pragma mark UITableViewDataSource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 10;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return 4;
}

- (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];
    }
    
    // Configure the cell.

    return cell;
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{
    
    return [NSString stringWithFormat:@"Section %i", section];
    
}


#pragma mark -
#pragma mark Data Source Loading / Reloading Methods

- (void)reloadTableViewDataSource{
    
    //  should be calling your tableviews data source model to reload
    //  put here just for demo
    _reloading = YES;
    
}

- (void)doneLoadingTableViewData{
    
    //  model should call this when its done loading
    _reloading = NO;
    [_refreshHeaderView egoRefreshScrollViewDataSourceDidFinishedLoading:self.tableView];
    
}


#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:4.0];
    
}

- (BOOL)egoRefreshTableHeaderDataSourceIsLoading:(EGORefreshTableHeaderView*)view{
    
    return _reloading; // should return if data source model is reloading
    
}

- (NSDate*)egoRefreshTableHeaderDataSourceLastUpdated:(EGORefreshTableHeaderView*)view{
    
    return [NSDate date]; // should return date data source was last changed
    
}


#pragma mark -
#pragma mark Memory Management

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

- (void)viewDidUnload {
    _refreshHeaderView=nil;
}

- (void)dealloc {
    
    _refreshHeaderView = nil;
    [super dealloc];
}

@end

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