我没有使用 SVPullToRefresh 但我确实查看了代码并将其与我们正在使用的进行比较。我们有一个简单的子类，它包装了我们的 UITableView 所在的控制器，并添加了插入式 PTR 支持。SV实现似乎更容易使用
代码如下：
PullToRefreshViewController.h
//
// PullRefreshTableViewController.h
// Plancast
//
// Created by Leah Culver on 7/2/10.
// Copyright (c) 2010 Leah Culver
//
// 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 <UIKit/UIKit.h>
@interface PullRefreshTableViewController : UITableViewController <UIScrollViewDelegate> {
UIView *refreshHeaderView;
UILabel *refreshLabel;
UIImageView *refreshArrow;
UIActivityIndicatorView *refreshSpinner;
BOOL isDragging;
BOOL isLoading;
NSString *textPull;
NSString *textRelease;
NSString *textLoading;
}
@property (nonatomic, retain) UIView *refreshHeaderView;
@property (nonatomic, retain) UILabel *refreshLabel;
@property (nonatomic, retain) UIImageView *refreshArrow;
@property (nonatomic, retain) UIActivityIndicatorView *refreshSpinner;
@property (nonatomic, copy) NSString *textPull;
@property (nonatomic, copy) NSString *textRelease;
@property (nonatomic, copy) NSString *textLoading;
- (void)setupStrings;
- (void)addPullToRefreshHeader;
- (void)startLoading;
- (void)stopLoading;
- (void)refresh;
@end
PullToRefreshViewController.m
//
// PullRefreshTableViewController.m
// Plancast
//
// Created by Leah Culver on 7/2/10.
// Copyright (c) 2010 Leah Culver
//
// 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 <QuartzCore/QuartzCore.h>
#import "PullRefreshTableViewController.h"
#define REFRESH_HEADER_HEIGHT 52.0f
@implementation PullRefreshTableViewController
@synthesize textPull, textRelease, textLoading, refreshHeaderView, refreshLabel, refreshArrow, refreshSpinner;
- (id)initWithStyle:(UITableViewStyle)style {
self = [super initWithStyle:style];
if (self != nil) {
[self setupStrings];
}
return self;
}
- (id)initWithCoder:(NSCoder *)aDecoder {
self = [super initWithCoder:aDecoder];
if (self != nil) {
[self setupStrings];
}
return self;
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self != nil) {
[self setupStrings];
}
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self addPullToRefreshHeader];
}
- (void)setupStrings{
textPull = [[NSString alloc] initWithString:@"Pull down to refresh..."];
textRelease = [[NSString alloc] initWithString:@"Release to refresh..."];
textLoading = [[NSString alloc] initWithString:@"Loading..."];
}
- (void)addPullToRefreshHeader {
refreshHeaderView = [[UIView alloc] initWithFrame:CGRectMake((self.view.bounds.size.width - 320)/2, 0 - REFRESH_HEADER_HEIGHT, 320, REFRESH_HEADER_HEIGHT)];
refreshHeaderView.backgroundColor = [UIColor clearColor];
//[refreshHeaderView setAutoresizingMask:UIViewAutoresizingFlexibleWidth];
refreshLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 320, REFRESH_HEADER_HEIGHT)];
refreshLabel.backgroundColor = [UIColor clearColor];
refreshLabel.font = [UIFont boldSystemFontOfSize:12.0];
refreshLabel.textAlignment = UITextAlignmentCenter;
refreshLabel.textColor = [UIColor whiteColor];
refreshArrow = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"arrow.png"]];
refreshArrow.frame = CGRectMake(floorf((REFRESH_HEADER_HEIGHT - 27) / 2),
(floorf(REFRESH_HEADER_HEIGHT - 44) / 2),
27, 44);
refreshSpinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
refreshSpinner.frame = CGRectMake(floorf(floorf(REFRESH_HEADER_HEIGHT - 20) / 2), floorf((REFRESH_HEADER_HEIGHT - 20) / 2), 20, 20);
refreshSpinner.hidesWhenStopped = YES;
[refreshHeaderView addSubview:refreshLabel];
[refreshHeaderView addSubview:refreshArrow];
[refreshHeaderView addSubview:refreshSpinner];
[self._tableView addSubview:refreshHeaderView];
}
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
if (isLoading) return;
isDragging = YES;
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
if (isLoading) {
// Update the content inset, good for section headers
if (scrollView.contentOffset.y > 0)
self._tableView.contentInset = UIEdgeInsetsZero;
else if (scrollView.contentOffset.y >= -REFRESH_HEADER_HEIGHT)
self._tableView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);
} else if (isDragging && scrollView.contentOffset.y < 0) {
// Update the arrow direction and label
[UIView beginAnimations:nil context:NULL];
if (scrollView.contentOffset.y < -REFRESH_HEADER_HEIGHT) {
// User is scrolling above the header
refreshLabel.text = self.textRelease;
[refreshArrow layer].transform = CATransform3DMakeRotation(M_PI, 0, 0, 1);
} else { // User is scrolling somewhere within the header
refreshLabel.text = self.textPull;
[refreshArrow layer].transform = CATransform3DMakeRotation(M_PI * 2, 0, 0, 1);
}
[UIView commitAnimations];
}
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
if (isLoading) return;
isDragging = NO;
if (scrollView.contentOffset.y <= -REFRESH_HEADER_HEIGHT) {
// Released above the header
[self startLoading];
}
}
- (void)startLoading {
isLoading = YES;
// Show the header
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
self._tableView.contentInset = UIEdgeInsetsMake(REFRESH_HEADER_HEIGHT, 0, 0, 0);
refreshLabel.text = self.textLoading;
refreshArrow.hidden = YES;
[refreshSpinner startAnimating];
[UIView commitAnimations];
// Refresh action!
[self refresh];
}
- (void)stopLoading {
isLoading = NO;
// Hide the header
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDelegate:self];
[UIView setAnimationDuration:0.3];
[UIView setAnimationDidStopSelector:@selector(stopLoadingComplete:finished:context:)];
self._tableView.contentInset = UIEdgeInsetsZero;
[refreshArrow layer].transform = CATransform3DMakeRotation(M_PI * 2, 0, 0, 1);
[UIView commitAnimations];
}
- (void)stopLoadingComplete:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {
// Reset the header
refreshLabel.text = self.textPull;
refreshArrow.hidden = NO;
[refreshSpinner stopAnimating];
}
- (void)refresh {
// This is just a demo. Override this method with your custom reload action.
// Don't forget to call stopLoading at the end.
[self performSelector:@selector(stopLoading) withObject:nil afterDelay:2.0];
}
- (void)dealloc {
[refreshHeaderView release];
[refreshLabel release];
[refreshArrow release];
[refreshSpinner release];
[textPull release];
[textRelease release];
[textLoading release];
[super dealloc];
}
@end