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Fix for PullToRefresh initWithScrollView
//
// PullToRefreshView.m
// Grant Paul (chpwn)
//
// (based on EGORefreshTableHeaderView)
//
// 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 "PullToRefreshView.h"
#import <math.h>
#define kPullToRefreshViewBackgroundColor [UIColor colorWithRed:226.0/255.0 green:231.0/255.0 blue:237.0/255.0 alpha:1.0]
#define kPullToRefreshViewTitleColor [UIColor colorWithRed:(87.0/255.0) green:(108.0/255.0) blue:(137.0/255.0) alpha:1.0]
#define kPullToRefreshViewSubtitleColor kPullToRefreshViewTitleColor
#define kPullToRefreshViewAnimationDuration 0.18f
#define kPullToRefreshViewTriggerOffset -65.0f
@interface PullToRefreshView (Private)
@property (nonatomic, assign) PullToRefreshViewState state;
@end
@implementation PullToRefreshView
@synthesize delegate, scrollView;
- (void)showActivity:(BOOL)show animated:(BOOL)animated {
if (show) [activityView startAnimating];
else [activityView stopAnimating];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:(animated ? kPullToRefreshViewAnimationDuration : 0.0)];
arrowImage.opacity = (show ? 0.0 : 1.0);
[UIView commitAnimations];
}
- (void)setImageFlipped:(BOOL)flipped {
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:kPullToRefreshViewAnimationDuration];
arrowImage.transform = (flipped ? CATransform3DMakeRotation(M_PI * 2, 0.0f, 0.0f, 1.0f) : CATransform3DMakeRotation(M_PI, 0.0f, 0.0f, 1.0f));
[UIView commitAnimations];
}
- (id)initWithScrollView:(UIScrollView *)scroll {
CGRect frame = CGRectMake(0.0f, 0.0f - scroll.bounds.size.height, scroll.bounds.size.width, scroll.bounds.size.height);
if ((self = [super initWithFrame:frame])) {
scrollView = [scroll retain];
[scrollView addObserver:self forKeyPath:@"contentOffset" options:NSKeyValueObservingOptionNew context:NULL];
self.autoresizingMask = UIViewAutoresizingFlexibleWidth;
self.backgroundColor = kPullToRefreshViewBackgroundColor;
subtitleLabel = [[UILabel alloc] init];
subtitleLabel.frame = CGRectMake(0.0f, frame.size.height - 30.0f, self.frame.size.width, 20.0f);
subtitleLabel.autoresizingMask = UIViewAutoresizingFlexibleWidth;
subtitleLabel.font = [UIFont systemFontOfSize:12.0f];
subtitleLabel.textColor = kPullToRefreshViewSubtitleColor;
subtitleLabel.shadowColor = [UIColor colorWithWhite:0.9f alpha:1.0f];
subtitleLabel.shadowOffset = CGSizeMake(0.0f, 1.0f);
subtitleLabel.backgroundColor = [UIColor clearColor];
subtitleLabel.textAlignment = UITextAlignmentCenter;
[self addSubview:subtitleLabel];
statusLabel = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, frame.size.height - 48.0f, self.frame.size.width, 20.0f)];
statusLabel.autoresizingMask = UIViewAutoresizingFlexibleWidth;
statusLabel.font = [UIFont systemFontOfSize:12.f];
statusLabel.textColor = kPullToRefreshViewTitleColor;
statusLabel.shadowColor = [UIColor colorWithWhite:0.9f alpha:1.0f];
statusLabel.shadowOffset = CGSizeMake(0.0f, 1.0f);
statusLabel.backgroundColor = [UIColor clearColor];
statusLabel.textAlignment = UITextAlignmentCenter;
[self addSubview:statusLabel];
arrowImage = [[CALayer alloc] init];
arrowImage.frame = CGRectMake(25.0f, frame.size.height - 60.0f, 24.0f, 52.0f);
arrowImage.contentsGravity = kCAGravityResizeAspect;
arrowImage.contents = (id) [UIImage imageNamed:@"arrow"].CGImage;
activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
activityView.frame = CGRectMake(30.0f, frame.size.height - 38.0f, 20.0f, 20.0f);
[self addSubview:activityView];
[self setState:kPullToRefreshViewStateNormal];
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
arrowImage.contentsScale = [[UIScreen mainScreen] scale];
}
#endif
[self.layer addSublayer:arrowImage];
}
return self;
}
#pragma mark -
#pragma mark Setters
- (void)refreshLastUpdatedDate {
NSDate *date = [NSDate date];
if ([delegate respondsToSelector:@selector(pullToRefreshViewLastUpdated:)])
date = [delegate pullToRefreshViewLastUpdated:self];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setAMSymbol:@"AM"];
[formatter setPMSymbol:@"PM"];
[formatter setDateFormat:@"MM/dd/yy hh:mm a"];
subtitleLabel.text = [NSString stringWithFormat:@"Last Updated: %@", [formatter stringFromDate:date]];
[formatter release];
}
- (void)beginLoading {
[self setState:kPullToRefreshViewStateProgrammaticRefresh];
}
- (void)finishedLoading {
if (state == kPullToRefreshViewStateLoading || state == kPullToRefreshViewStateProgrammaticRefresh) {
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3f];
[self setState:kPullToRefreshViewStateNormal];
[UIView commitAnimations];
}
}
- (void)setState:(PullToRefreshViewState)state_ {
if (state_ == state) return;
state = state_;
switch (state) {
case kPullToRefreshViewStateReady:
statusLabel.text = @"Release to refresh…";
[self showActivity:NO animated:NO];
[self setImageFlipped:YES];
scrollView.contentInset = UIEdgeInsetsZero;
break;
case kPullToRefreshViewStateNormal:
statusLabel.text = @"Pull down to refresh…";
[self showActivity:NO animated:NO];
[self setImageFlipped:NO];
[self refreshLastUpdatedDate];
scrollView.contentInset = UIEdgeInsetsZero;
break;
case kPullToRefreshViewStateLoading:
case kPullToRefreshViewStateProgrammaticRefresh:
statusLabel.text = @"Loading…";
[self showActivity:YES animated:YES];
[self setImageFlipped:NO];
scrollView.contentInset = UIEdgeInsetsMake(fminf(-scrollView.contentOffset.y, -kPullToRefreshViewTriggerOffset), 0, 0, 0);
break;
default:
break;
}
[self setNeedsLayout];
}
#pragma mark -
#pragma mark UIScrollView
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
if ([keyPath isEqualToString:@"contentOffset"]) {
if (scrollView.isDragging) {
// if we were in a refresh state
if (state == kPullToRefreshViewStateReady) {
// but now we're in between the "trigger" offset and 0
if (scrollView.contentOffset.y > kPullToRefreshViewTriggerOffset && scrollView.contentOffset.y < 0.0f) {
// reset to "pull me to refresh!"
[self setState:kPullToRefreshViewStateNormal];
}
} else if (state == kPullToRefreshViewStateNormal) {
// if we're in a normal state and we're above the top of the scrollView and we pass the max
if (scrollView.contentOffset.y < kPullToRefreshViewTriggerOffset) {
// go to the ready state.
[self setState:kPullToRefreshViewStateReady];
}
} else if (state == kPullToRefreshViewStateLoading || state == kPullToRefreshViewStateProgrammaticRefresh) {
// if the user scrolls the view down while we're loading, make sure the loading screen is visible if they scroll to the top:
if (scrollView.contentOffset.y >= 0) {
// this lets the table headers float to the top
scrollView.contentInset = UIEdgeInsetsZero;
} else {
// but show loading if they go past the top of the tableview
scrollView.contentInset = UIEdgeInsetsMake(fminf(-scrollView.contentOffset.y, -kPullToRefreshViewTriggerOffset), 0, 0, 0);
}
}
} else {
if (state == kPullToRefreshViewStateReady) {
// if we're in state ready and a drag stops, then transition to loading.
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:kPullToRefreshViewAnimationDuration];
[self setState:kPullToRefreshViewStateLoading];
[UIView commitAnimations];
if ([delegate respondsToSelector:@selector(pullToRefreshViewShouldRefresh:)])
[delegate pullToRefreshViewShouldRefresh:self];
}
}
// Fix for view moving laterally with webView
self.frame = CGRectMake(scrollView.contentOffset.x, self.frame.origin.y, self.frame.size.width, self.frame.size.height);
}
}
#pragma mark -
#pragma mark Memory management
- (void)containingViewDidUnload {
[scrollView removeObserver:self forKeyPath:@"contentOffset"];
[scrollView release];
scrollView = nil;
}
- (void)dealloc {
[[NSNotificationCenter defaultCenter] removeObserver:self];
if (scrollView != nil) { // probably leaking the scrollView
NSLog(@"PullToRefreshView: Leaking a scrollView?");
[scrollView release];
}
[arrowImage release];
[statusLabel release];
[subtitleLabel release];
[super dealloc];
}
@end
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