变更记录

序号 录入时间 录入人 备注
1 2015-03-23 Alfred Jiang -
2 2015-12-23 Alfred Jiang -

方案名称

UITableView - 使用 EGORefreshTableHeaderView 实现下拉刷新 UITableView

关键字

UITableView \ EGORefreshTableHeaderView \ 下拉刷新

需求场景

  1. 需要实现列表数据的下拉刷新

参考链接

  1. CSDN - IOS详解TableView——内置刷新，EGO，以及搜索显示控制器
  2. GitHub - EGOTableViewPullRefresh

详细内容

1. EGORefreshTableHeaderView(.h.m)
  1. EGORefreshTableHeaderView.h ```objective-c // // EGORefreshTableHeaderView.h // Demo // // Created by Devin Doty on 10/14/09October14. // Copyright 2009 enormego. All rights reserved. // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN // THE SOFTWARE. //

import

import

typedef enum{ EGOOPullPulling = 0, EGOOPullNormal, EGOOPullLoading, } EGOPullState;

define DEFAULT_ARROW_IMAGE [UIImage imageNamed:@"blueArrow.png"]

define DEFAULT_BACKGROUND_COLOR [UIColor colorWithRed:226.0/255.0 green:231.0/255.0 blue:237.0/255.0 alpha:1.0]

define DEFAULT_TEXT_COLOR [UIColor colorWithRed:87.0/255.0 green:108.0/255.0 blue:137.0/255.0 alpha:1.0]

define DEFAULT_ACTIVITY_INDICATOR_STYLE UIActivityIndicatorViewStyleWhite

define FLIP_ANIMATION_DURATION 0.18f

define PULL_AREA_HEIGTH 60.0f

define PULL_TRIGGER_HEIGHT (PULL_AREA_HEIGTH + 5.0f)

@protocol EGORefreshTableHeaderDelegate; @interface EGORefreshTableHeaderView : UIView {

id _delegate;
EGOPullState _state;

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

// Set this to Yes when egoRefreshTableHeaderDidTriggerRefresh delegate is called and No with egoRefreshScrollViewDataSourceDidFinishedLoading
BOOL isLoading;

}

@property(nonatomic,assign) id delegate;

  • (void)refreshLastUpdatedDate;
  • (void)egoRefreshScrollViewDidScroll:(UIScrollView *)scrollView;
  • (void)egoRefreshScrollViewDidEndDragging:(UIScrollView *)scrollView;
  • (void)egoRefreshScrollViewWillBeginDragging:(UIScrollView *)scrollView;
  • (void)egoRefreshScrollViewDataSourceDidFinishedLoading:(UIScrollView *)scrollView;
  • (void)startAnimatingWithScrollView:(UIScrollView *) scrollView;
  • (void)setBackgroundColor:(UIColor )backgroundColor textColor:(UIColor ) textColor arrowImage:(UIImage *) arrowImage;

@end

@protocol EGORefreshTableHeaderDelegate

  • (void)egoRefreshTableHeaderDidTriggerRefresh:(EGORefreshTableHeaderView*)view; @optional
  • (NSDate)egoRefreshTableHeaderDataSourceLastUpdated:(EGORefreshTableHeaderView)view;

@end


1. EGORefreshTableHeaderView.m
```objective-c
//
//  EGORefreshTableHeaderView.m
//  Demo
//
//  Created by Devin Doty on 10/14/09October14.
//  Copyright 2009 enormego. All rights reserved.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

#import "EGORefreshTableHeaderView.h"

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

@implementation EGORefreshTableHeaderView

@synthesize delegate=_delegate;

- (id)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {

        isLoading = NO;

        CGFloat midY = frame.size.height - PULL_AREA_HEIGTH/2;

        /* Config Last Updated Label */
        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, midY, self.frame.size.width, 20.0f)];
        label.autoresizingMask = UIViewAutoresizingFlexibleWidth;
        label.font = [UIFont systemFontOfSize:12.0f];
        label.shadowOffset = CGSizeMake(0.0f, 1.0f);
        label.backgroundColor = [UIColor clearColor];
        label.textAlignment = NSTextAlignmentCenter;
        [self addSubview:label];
        _lastUpdatedLabel=label;

        /* Config Status Updated Label */
        label = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, midY - 18, self.frame.size.width, 20.0f)];
        label.autoresizingMask = UIViewAutoresizingFlexibleWidth;
        label.font = [UIFont boldSystemFontOfSize:13.0f];
        label.shadowOffset = CGSizeMake(0.0f, 1.0f);
        label.backgroundColor = [UIColor clearColor];
        label.textAlignment = NSTextAlignmentCenter;
        [self addSubview:label];
        _statusLabel=label;

        /* Config Arrow Image */
        CALayer *layer = [[CALayer alloc] init];
        layer.frame = CGRectMake(25.0f,midY - 35, 30.0f, 55.0f);
        layer.contentsGravity = kCAGravityResizeAspect;
#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;

        /* Config activity indicator */
        UIActivityIndicatorView *view = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:DEFAULT_ACTIVITY_INDICATOR_STYLE];
        view.frame = CGRectMake(25.0f,midY - 8, 20.0f, 20.0f);
        [self addSubview:view];
        _activityView = view;

        [self setState:EGOOPullNormal];

        /* Configure the default colors and arrow image */
        [self setBackgroundColor:nil textColor:nil arrowImage:nil];

    }

    return self;

}

#pragma mark -
#pragma mark Setters

#define aMinute 60
#define anHour 3600
#define aDay 86400

- (void)refreshLastUpdatedDate {
    NSDate * date = nil;
    if ([_delegate respondsToSelector:@selector(egoRefreshTableHeaderDataSourceLastUpdated:)]) {
        date = [_delegate egoRefreshTableHeaderDataSourceLastUpdated:self];
    }
    if(date) {
        NSTimeInterval timeSinceLastUpdate = [date timeIntervalSinceNow];
        NSInteger timeToDisplay = 0;
        timeSinceLastUpdate *= -1;

        if(timeSinceLastUpdate < anHour) {
            timeToDisplay = (NSInteger) (timeSinceLastUpdate / aMinute);

            if(timeToDisplay == /* Singular*/ 1) {
            _lastUpdatedLabel.text = [NSString stringWithFormat:NSLocalizedStringFromTable(@"更新于 %ld 分钟之前",@"PullTableViewLan",@"Last uppdate in minutes singular"),(long)timeToDisplay];
            } else {
                /* Plural */
                _lastUpdatedLabel.text = [NSString stringWithFormat:NSLocalizedStringFromTable(@"更新于 %ld 分钟之前",@"PullTableViewLan",@"Last uppdate in minutes plural"), (long)timeToDisplay];

            }

        } else if (timeSinceLastUpdate < aDay) {
            timeToDisplay = (NSInteger) (timeSinceLastUpdate / anHour);
            if(timeToDisplay == /* Singular*/ 1) {
                _lastUpdatedLabel.text = [NSString stringWithFormat:NSLocalizedStringFromTable(@"更新于 %ld 小时之前",@"PullTableViewLan",@"Last uppdate in hours singular"), (long)timeToDisplay];
            } else {
                /* Plural */
                _lastUpdatedLabel.text = [NSString stringWithFormat:NSLocalizedStringFromTable(@"更新于 %ld 小时之前",@"PullTableViewLan",@"Last uppdate in hours plural"), (long)timeToDisplay];

            }

        } else {
            timeToDisplay = (NSInteger) (timeSinceLastUpdate / aDay);
            if(timeToDisplay == /* Singular*/ 1) {
                _lastUpdatedLabel.text = [NSString stringWithFormat:NSLocalizedStringFromTable(@"更新于 %ld 天之前",@"PullTableViewLan",@"Last uppdate in days singular"), (long)timeToDisplay];
            } else {
                /* Plural */
                _lastUpdatedLabel.text = [NSString stringWithFormat:NSLocalizedStringFromTable(@"更新于 %ld 天之前",@"PullTableViewLan",@"Last uppdate in days plural"), (long)timeToDisplay];
            }

        }

    } else {
        _lastUpdatedLabel.text = nil;
    }

    // Center the status label if the lastupdate is not available
    CGFloat midY = self.frame.size.height - PULL_AREA_HEIGTH/2;
    if(!_lastUpdatedLabel.text) {
        _statusLabel.frame = CGRectMake(0.0f, midY - 8, self.frame.size.width, 20.0f);
    } else {
        _statusLabel.frame = CGRectMake(0.0f, midY - 18, self.frame.size.width, 20.0f);
    }

}

- (void)setState:(EGOPullState)aState{

    switch (aState) {
        case EGOOPullPulling:

            _statusLabel.text = NSLocalizedStringFromTable(@"Release to refresh ...",@"PullTableViewLan", @"Release to refresh status");
            [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 EGOOPullNormal:

            if (_state == EGOOPullPulling) {
                [CATransaction begin];
                [CATransaction setAnimationDuration:FLIP_ANIMATION_DURATION];
                _arrowImage.transform = CATransform3DIdentity;
                [CATransaction commit];
            }

            _statusLabel.text = NSLocalizedStringFromTable(@"Pull down to refresh ...",@"PullTableViewLan", @"Pull down to refresh status");
            [_activityView stopAnimating];
            [CATransaction begin];
            [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
            _arrowImage.hidden = NO;
            _arrowImage.transform = CATransform3DIdentity;
            [CATransaction commit];

            [self refreshLastUpdatedDate];

            break;
        case EGOOPullLoading:

            _statusLabel.text = NSLocalizedStringFromTable(@"Loading ...",@"PullTableViewLan", @"Loading Status");
            [_activityView startAnimating];
            [CATransaction begin];
            [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
            _arrowImage.hidden = YES;
            [CATransaction commit];

            break;
        default:
            break;
    }

    _state = aState;
}

- (void)setBackgroundColor:(UIColor *)backgroundColor textColor:(UIColor *) textColor arrowImage:(UIImage *) arrowImage
{
    self.backgroundColor = backgroundColor? backgroundColor : DEFAULT_BACKGROUND_COLOR;

    if(textColor) {
        _lastUpdatedLabel.textColor = textColor;
        _statusLabel.textColor = textColor;
    } else {
        _lastUpdatedLabel.textColor = DEFAULT_TEXT_COLOR;
        _statusLabel.textColor = DEFAULT_TEXT_COLOR;
    }
    _lastUpdatedLabel.shadowColor = [_lastUpdatedLabel.textColor colorWithAlphaComponent:0.1f];
    _statusLabel.shadowColor = [_statusLabel.textColor colorWithAlphaComponent:0.1f];

    _arrowImage.contents = (id)(arrowImage? arrowImage.CGImage : DEFAULT_ARROW_IMAGE.CGImage);
}

#pragma mark -
#pragma mark ScrollView Methods

- (void)egoRefreshScrollViewDidScroll:(UIScrollView *)scrollView {

    if (_state == EGOOPullLoading) {
        CGFloat offset = MAX(scrollView.contentOffset.y * -1, 0);
        offset = MIN(offset, PULL_AREA_HEIGTH);
        UIEdgeInsets currentInsets = scrollView.contentInset;
        currentInsets.top = offset;
        scrollView.contentInset = currentInsets;

    } else if (scrollView.isDragging) {
        if (_state == EGOOPullPulling && scrollView.contentOffset.y > -PULL_TRIGGER_HEIGHT && scrollView.contentOffset.y < 0.0f && !isLoading) {
            [self setState:EGOOPullNormal];
        } else if (_state == EGOOPullNormal && scrollView.contentOffset.y < -PULL_TRIGGER_HEIGHT && !isLoading) {
            [self setState:EGOOPullPulling];

        }

        if (scrollView.contentInset.top != 0) {
            UIEdgeInsets currentInsets = scrollView.contentInset;
            currentInsets.top = 0;
            scrollView.contentInset = currentInsets;
        }

    }

}

- (void)startAnimatingWithScrollView:(UIScrollView *) scrollView {
    isLoading = YES;

    [self setState:EGOOPullLoading];
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.2];
    UIEdgeInsets currentInsets = scrollView.contentInset;
    currentInsets.top = PULL_AREA_HEIGTH;
    scrollView.contentInset = currentInsets;
    [UIView commitAnimations];
    if(scrollView.contentOffset.y == 0){
        [scrollView setContentOffset:CGPointMake(scrollView.contentOffset.x, -PULL_TRIGGER_HEIGHT) animated:YES];
    }
}

- (void)egoRefreshScrollViewDidEndDragging:(UIScrollView *)scrollView {

    if (scrollView.contentOffset.y <= - PULL_TRIGGER_HEIGHT && !isLoading) {
        if ([_delegate respondsToSelector:@selector(egoRefreshTableHeaderDidTriggerRefresh:)]) {
            [_delegate egoRefreshTableHeaderDidTriggerRefresh:self];
        }
        [self startAnimatingWithScrollView:scrollView];
    }

}

- (void)egoRefreshScrollViewDataSourceDidFinishedLoading:(UIScrollView *)scrollView {

    isLoading = NO;

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:.3];
    UIEdgeInsets currentInsets = scrollView.contentInset;
    currentInsets.top = 0;
    scrollView.contentInset = currentInsets;
    [UIView commitAnimations];

    [self setState:EGOOPullNormal];

}

- (void)egoRefreshScrollViewWillBeginDragging:(UIScrollView *)scrollView
{
    [self refreshLastUpdatedDate];
}

#pragma mark -
#pragma mark Dealloc

- (void)dealloc {

    _delegate=nil;
    [_activityView release];
    [_statusLabel release];
    [_arrowImage release];
    [_lastUpdatedLabel release];
    [super dealloc];
}

@end
2. 设置 ARC
Project 名称 -> TARGETS -> Build Phases -> Compile Soucrce
设置 EGORefreshTableHeaderView.m 属性 -fno-objc-arc
3. 引入并使用

  1. 引入头文件

    #import "EGORefreshTableHeaderView.h"

  2. 实例化 EGORefreshTableHeaderView 对象 ```swift var headerRefreshView : EGORefreshTableHeaderView!

func setupRefreshTableView() { headerRefreshView = EGORefreshTableHeaderView(frame: CGRectMake(0, 0 - CGRectGetHeight(self.tableViewMain.frame), CGRectGetWidth(self.tableViewMain.frame), CGRectGetHeight(self.tableViewMain.frame))) headerRefreshView.delegate = self self.tableViewMain.addSubview(headerRefreshView) }


3. 实现必要的代理
```swift
EGORefreshTableHeaderDelegate 和 UIScrollViewDelegate

// MARK : - Drag Refresh

func egoRefreshTableHeaderDidTriggerRefresh(view: EGORefreshTableHeaderView!) {
    //
    println("egoRefreshTableHeaderDidTriggerRefresh")

    self.reloadTableViewDataSource()

    dispatch_after(
        dispatch_time(
            DISPATCH_TIME_NOW,
            Int64(3.0 * Double(NSEC_PER_SEC))
        ),
        dispatch_get_main_queue(),{
          self.endReloadTableViewDataSource()
        })

}

func scrollViewDidScroll(scrollView: UIScrollView) {
    headerRefreshView.egoRefreshScrollViewDidScroll(scrollView)
}

func scrollViewDidEndDragging(scrollView: UIScrollView, willDecelerate decelerate: Bool)     {
    headerRefreshView.egoRefreshScrollViewDidEndDragging(scrollView)
}
  1. 实现刷新请求和结束操作函数 ```swift func reloadTableViewDataSource() {

}

func endReloadTableViewDataSource() { self.headerRefreshView.egoRefreshScrollViewDataSourceDidFinishedLoading(self.tableViewMain) } ```

效果图

（无）

备注

（无）

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