在IOS开发中UITableView是非常常用的一个功能，而在使用UITableView的时候我们经常要用到下拉刷新和上拉加载的功能，今天花时间实现了简单的UITableView的下拉刷新和上拉加载功能，效果图如下：
代码如下：
TableRefreshHeaderView.h
#import <UIKit/UIKit.h> @interface TableRefreshHeaderView : UIView @property(nonatomic, strong)UIImageView *arrowView; @property(nonatomic, strong)UILabel *refreshText; @property(nonatomic, strong)UIActivityIndicatorView *loadingIndicatorView; -(instancetype)initWithFrame:(CGRect)frame; - (void)setRefreshMode:(int)mode; @end
TableRefreshHeaderView.m
#import "TableRefreshHeaderView.h" #define UISCREEN_WIDTH [UIScreen mainScreen ].bounds.size.width
#define UISCREEN_HEIGHT [UIScreen mainScreen ].bounds.size.height @implementation TableRefreshHeaderView /*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code
}
*/ -(instancetype)initWithFrame:(CGRect)frame;
{
self = [super initWithFrame:frame];
if (self) {
[self addSubview:self.arrowView];
[self addSubview:self.refreshText];
[self addSubview:self.loadingIndicatorView];
self.loadingIndicatorView.hidden = YES;
}
return self; } //箭头图片UIImageView
-(UIImageView *)arrowView
{
if (!_arrowView) {
_arrowView = [[UIImageView alloc]initWithFrame:CGRectMake(UISCREEN_WIDTH / 2.0 - , , , )];
_arrowView.image = [UIImage imageNamed:@"arrow"];
}
return _arrowView;
} //下拉刷新文字
-(UILabel *)refreshText
{
if (!_refreshText) {
_refreshText = [[UILabel alloc]initWithFrame:CGRectMake(UISCREEN_WIDTH / 2.0 - , , , )];
_refreshText.font = [UIFont fontWithName:@"Arial" size:];
_refreshText.textColor = [UIColor blackColor];
_refreshText.text = @"下拉刷新";
}
return _refreshText;
} //刷新旋转视图
- (UIActivityIndicatorView *)loadingIndicatorView
{
if (!_loadingIndicatorView) {
_loadingIndicatorView = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(UISCREEN_WIDTH / 2.0 - , , , )];
[_loadingIndicatorView setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleGray];
_loadingIndicatorView.backgroundColor = [UIColor clearColor];
_loadingIndicatorView.center = CGPointMake(UISCREEN_WIDTH / 2.0 - , );
}
return _loadingIndicatorView;
} //设置三种刷新模式
- (void)setRefreshMode:(int)mode
{
switch (mode) {
case ://下拉过程中
{
self.arrowView.hidden = NO;
self.loadingIndicatorView.hidden = YES;
[self.loadingIndicatorView stopAnimating];
[UIView animateWithDuration:0.3 animations:^(void){
_arrowView.transform = CGAffineTransformMakeRotation(M_PI * );
}];
self.refreshText.text = @"下拉刷新";
}
break;
case ://提示松开刷新
{
self.arrowView.hidden = NO;
self.loadingIndicatorView.hidden = YES;
[self.loadingIndicatorView stopAnimating];
[UIView animateWithDuration:0.3 animations:^(void){
_arrowView.transform = CGAffineTransformMakeRotation(M_PI);
}];
self.refreshText.text = @"松开刷新";
}
break;
case ://松开后刷新
{
self.arrowView.hidden = YES;
self.loadingIndicatorView.hidden = NO;
[self.loadingIndicatorView startAnimating];
self.refreshText.text = @"正在刷新"; }
break; default:
break;
}
} @end
TableRefreshFooterView.h
#import <UIKit/UIKit.h> @interface TableRefreshFooterView : UIView @property(nonatomic, strong) UIActivityIndicatorView *loadingIndcatorView; @property(nonatomic, strong) UILabel *loadingText; - (void)setLoadingMode:(int)mode; @end
TableRefreshFooterView.m
#import "TableRefreshFooterView.h" #define UISCREEN_WIDTH [UIScreen mainScreen ].bounds.size.width
#define UISCREEN_HEIGHT [UIScreen mainScreen ].bounds.size.height @implementation TableRefreshFooterView - (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self addSubview:self.loadingIndcatorView];
[self addSubview:self.loadingText];
}
return self;
} - (UIActivityIndicatorView *)loadingIndcatorView
{
if (!_loadingIndcatorView) {
_loadingIndcatorView = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(UISCREEN_WIDTH / 2.0 - , , , )];
[_loadingIndcatorView setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleGray];
_loadingIndcatorView.backgroundColor = [UIColor clearColor];
_loadingIndcatorView.center = CGPointMake(UISCREEN_WIDTH / 2.0 - , );
}
return _loadingIndcatorView;
} - (UILabel *)loadingText
{
if (!_loadingText) {
_loadingText = [[UILabel alloc]initWithFrame:CGRectMake(UISCREEN_WIDTH / 2.0 - , , , )];
_loadingText.font = [UIFont fontWithName:@"Arial" size:];
_loadingText.textColor = [UIColor blackColor];
_loadingText.text = @"加载中";
}
return _loadingText;
} - (void)setLoadingMode:(int)mode
{
switch (mode) {
case :
_loadingText.text = @"加载中";
[self.loadingIndcatorView startAnimating];
self.loadingIndcatorView.hidden = NO;
break;
case :
_loadingText.text = @"加载完毕";
[self.loadingIndcatorView stopAnimating];
self.loadingIndcatorView.hidden = YES;
break;
default:
break;
}
} /*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code
}
*/ @end
ViewController.h
#import <UIKit/UIKit.h>
#import "TableRefreshHeaderView.h"
#import "TableRefreshFooterView.h" @interface ViewController : UIViewController<UITableViewDelegate, UITableViewDataSource>
{
int rowCount;//行数
BOOL isLoading;//是否正在加载
BOOL isRefreshing;//是否正在刷新
int drageMode;//1为下拉刷新，2为上拉加载
} @property(nonatomic, strong)UITableView *myTableView; @property(nonatomic, strong)TableRefreshHeaderView *refreshHeaderView; @property(nonatomic, strong)TableRefreshFooterView *loadingFooterView; @end
ViewController.m
#import "ViewController.h"
#define UISCREEN_WIDTH [UIScreen mainScreen ].bounds.size.width
#define UISCREEN_HEIGHT [UIScreen mainScreen ].bounds.size.height
@interface ViewController () @end @implementation ViewController - (void)viewDidLoad {
[super viewDidLoad];
rowCount = ;
isLoading = NO;
isRefreshing = NO;
drageMode = -;
[self.view addSubview:self.myTableView];
[self.myTableView addSubview:self.refreshHeaderView];
[self.myTableView addSubview:self.loadingFooterView];
[self.myTableView addObserver:self forKeyPath:@"contentOffset" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld context:nil]; // Do any additional setup after loading the view, typically from a nib.
} - (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
} - (void)dealloc
{
[self.myTableView removeObserver:self forKeyPath:@"contentOffset"];
} - (UITableView *)myTableView
{
if (!_myTableView) {
_myTableView = [[UITableView alloc]initWithFrame:CGRectMake(, , UISCREEN_WIDTH, UISCREEN_HEIGHT - )];
_myTableView.delegate = self;
_myTableView.dataSource = self;
}
return _myTableView;
} - (TableRefreshHeaderView *)refreshHeaderView
{
if (!_refreshHeaderView) {
_refreshHeaderView = [[TableRefreshHeaderView alloc]initWithFrame:CGRectMake(, -, UISCREEN_WIDTH, )];
}
return _refreshHeaderView;
} - (TableRefreshFooterView *)loadingFooterView
{
if (!_loadingFooterView) {
_loadingFooterView = [[TableRefreshFooterView alloc]initWithFrame:CGRectMake(, self.myTableView.contentSize.height, UISCREEN_WIDTH, )];
}
return _loadingFooterView;
} - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return rowCount;
} - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return ;
} - (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"];
}
cell.textLabel.text=[NSString stringWithFormat:@"%ld",indexPath.row+];
return cell;
} -(void) tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
//如果列表控件加载完毕且当前为下拉加载，则将下拉加载视图移到列表可视范围之外
if([indexPath row] == ((NSIndexPath*)[[tableView indexPathsForVisibleRows] lastObject]).row && drageMode == ){
self.myTableView.contentInset = UIEdgeInsetsMake(, , , );
}
} //监听UITableview的顶部和头部下拉事件
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context
{
if ([keyPath isEqualToString:@"contentOffset"] && !isLoading && !isRefreshing) {
self.loadingFooterView.frame = CGRectMake(, self.myTableView.contentSize.height, UISCREEN_WIDTH, );
if (self.myTableView.isDragging) {
if (self.myTableView.contentOffset.y > -) {
[self.refreshHeaderView setRefreshMode:];
}
else if (self.myTableView.contentOffset.y < -)
{
[self.refreshHeaderView setRefreshMode:];
}
}
else
{
if (self.myTableView.contentOffset.y < -)
{
drageMode = ;
self.myTableView.contentInset = UIEdgeInsetsMake(, , , );
[self.refreshHeaderView setRefreshMode:];
[self beginRefresh];
}
else if (self.myTableView.contentOffset.y > self.myTableView.contentSize.height - self.myTableView.frame.size.height + )
{
drageMode = ;
if (rowCount < ) {
[self.loadingFooterView setLoadingMode:];
[self beginLoading];
}
else
{
[self.loadingFooterView setLoadingMode:];
self.myTableView.contentInset = UIEdgeInsetsMake(, , , );
}
}
}
}
} //开始刷新
- (void)beginRefresh
{
dispatch_async(dispatch_get_global_queue(, ), ^{
isRefreshing = YES;
sleep();//处理耗时操作
dispatch_async(dispatch_get_main_queue(), ^{
[self endRefresh];//处理完之后更新界面
});
}) ;
} //停止刷新
- (void)endRefresh
{
[UIView animateWithDuration:0.3 animations:^{
self.myTableView.contentInset = UIEdgeInsetsMake(, , , );
}];
[self.refreshHeaderView setRefreshMode:];
isRefreshing = NO;
} //开始加载
- (void)beginLoading
{
dispatch_async(dispatch_get_global_queue(, ), ^{
isLoading = YES;
rowCount += ;
self.myTableView.contentInset = UIEdgeInsetsMake(, , , );
sleep();//处理耗时操作
dispatch_async(dispatch_get_main_queue(), ^{
[self.myTableView reloadData];
[self endLoading];//处理完之后更新界面
});
}) ;
} //停止加载
- (void)endLoading
{
if (rowCount >= ) {
[self.loadingFooterView setLoadingMode:];
self.myTableView.contentInset = UIEdgeInsetsMake(, , , );
}
else
{
self.myTableView.contentInset = UIEdgeInsetsMake(, , , );
[self.loadingFooterView setLoadingMode:];
}
isLoading = NO;
} @end
源码下载地址：http://download.csdn.net/detail/lzm2625347497/9601843