EGORefreshTableHeaderView.m

//
//  EGORefreshTableHeaderView.m
//
//  Modified by Roy Clarkson on 8/27/10.
//
//  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"


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


@interface EGORefreshTableHeaderView()

@property (nonatomic, strong) UILabel *lastUpdatedLabel;
@property (nonatomic, strong) UILabel *statusLabel;
@property (nonatomic, strong) CALayer *arrowImage;
@property (nonatomic, strong) UIActivityIndicatorView *activityView;

@end


@implementation EGORefreshTableHeaderView

@synthesize lastUpdatedLabel;
@synthesize statusLabel;
@synthesize arrowImage;
@synthesize activityView;
@synthesize state = _state;

- (id)initWithFrame:(CGRect)frame
{
    if ((self = [super initWithFrame:frame])) 
	{
		self.autoresizingMask = UIViewAutoresizingFlexibleWidth;
        
		self.lastUpdatedLabel = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, frame.size.height - 30.0f, self.frame.size.width, 20.0f)];
		lastUpdatedLabel.autoresizingMask = UIViewAutoresizingFlexibleWidth;
		lastUpdatedLabel.font = [UIFont systemFontOfSize:12.0f];
		lastUpdatedLabel.textColor = TEXT_COLOR;
		lastUpdatedLabel.shadowColor = [UIColor colorWithWhite:0.9f alpha:1.0f];
		lastUpdatedLabel.shadowOffset = CGSizeMake(0.0f, 1.0f);
		lastUpdatedLabel.backgroundColor = [UIColor clearColor];
		lastUpdatedLabel.textAlignment = UITextAlignmentCenter;
		[self addSubview:lastUpdatedLabel];
		
		self.statusLabel = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, frame.size.height - 48.0f, self.frame.size.width, 20.0f)];
		statusLabel.autoresizingMask = UIViewAutoresizingFlexibleWidth;
		statusLabel.font = [UIFont boldSystemFontOfSize:13.0f];
		statusLabel.textColor = TEXT_COLOR;
		statusLabel.shadowColor = [UIColor colorWithWhite:0.9f alpha:1.0f];
		statusLabel.shadowOffset = CGSizeMake(0.0f, 1.0f);
		statusLabel.backgroundColor = [UIColor clearColor];
		statusLabel.textAlignment = UITextAlignmentCenter;
		[self setState:EGOOPullRefreshNormal];
		[self addSubview:statusLabel];
		
		self.arrowImage = [[CALayer alloc] init];
		arrowImage.frame = CGRectMake(25.0f, frame.size.height - 65.0f, 30.0f, 55.0f);
		arrowImage.contentsGravity = kCAGravityResizeAspect;
		arrowImage.contents = (id)[UIImage imageNamed:@"arrow-black.png"].CGImage;
		[[self layer] addSublayer:arrowImage];
		
		self.activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
		activityView.frame = CGRectMake(25.0f, frame.size.height - 38.0f, 20.0f, 20.0f);
		activityView.hidesWhenStopped = YES;
		[self addSubview:activityView];
    }
	
    return self;
}

- (void)drawRect:(CGRect)rect
{
	CGContextRef context = UIGraphicsGetCurrentContext();
	CGContextDrawPath(context,  kCGPathFillStroke);
	[BORDER_COLOR setStroke];
	CGContextBeginPath(context);
	CGContextMoveToPoint(context, 0.0f, self.bounds.size.height - 1);
	CGContextAddLineToPoint(context, self.bounds.size.width, self.bounds.size.height - 1);
	CGContextStrokePath(context);
}

- (void)setLastUpdateLabel:(NSDate *)lastRefreshDate
{
	NSDateFormatter* formatter = [[NSDateFormatter alloc] init];
	[formatter setAMSymbol:@"AM"];
	[formatter setPMSymbol:@"PM"];
	[formatter setDateFormat:@"MM/dd/yyyy hh:mm:a"];
	lastUpdatedLabel.text = [NSString stringWithFormat:@"Last Updated: %@", [formatter stringFromDate:lastRefreshDate]];
}

- (void)setState:(EGOPullRefreshState)aState{
	
	switch (aState) {
		case EGOOPullRefreshPulling:
			
			statusLabel.text = @"Release to refresh...";
			[CATransaction begin];
			[CATransaction setAnimationDuration:.18];
			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:.18];
				arrowImage.transform = CATransform3DIdentity;
				[CATransaction commit];
			}
			
			statusLabel.text = @"Pull down to refresh...";
			[activityView stopAnimating];
			[CATransaction begin];
			[CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions]; 
			arrowImage.hidden = NO;
			arrowImage.transform = CATransform3DIdentity;
			[CATransaction commit];

			break;
		case EGOOPullRefreshLoading:
			
			statusLabel.text = @"Loading...";
			[activityView startAnimating];
			[CATransaction begin];
			[CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions]; 
			arrowImage.hidden = YES;
			[CATransaction commit];
			
			break;
		default:
			break;
	}
	
	_state = aState;
}

@end