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//
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// SVPullToRefresh.m
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//
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// Created by Sam Vermette on 23.04.12.
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// Copyright (c) 2012 samvermette.com. All rights reserved.
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//
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// https://github.com/samvermette/SVPullToRefresh
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//
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#import <QuartzCore/QuartzCore.h>
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#import "SVPullToRefresh.h"
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enum {
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SVPullToRefreshStateHidden = 1,
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SVPullToRefreshStateVisible,
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SVPullToRefreshStateTriggered,
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SVPullToRefreshStateLoading
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};
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typedef NSUInteger SVPullToRefreshState;
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@interface SVPullToRefresh ()
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- (id)initWithScrollView:(UIScrollView*)scrollView;
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- (void)rotateArrow:(float)degrees hide:(BOOL)hide;
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- (void)setScrollViewContentInset:(UIEdgeInsets)contentInset;
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- (void)scrollViewDidScroll:(CGPoint)contentOffset;
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@property (nonatomic, copy) void (^actionHandler)(void);
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@property (nonatomic, readwrite) SVPullToRefreshState state;
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@property (nonatomic, strong) UIImageView *arrow;
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@property (nonatomic, strong, readonly) UIImage *arrowImage;
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@property (nonatomic, strong) UIActivityIndicatorView *activityIndicatorView;
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@property (nonatomic, strong) UILabel *titleLabel;
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@property (nonatomic, strong, readonly) UILabel *dateLabel;
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@property (nonatomic, strong, readonly) NSDateFormatter *dateFormatter;
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@property (nonatomic, weak) UIScrollView *scrollView;
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@property (nonatomic, readwrite) UIEdgeInsets originalScrollViewContentInset;
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@end
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@implementation SVPullToRefresh
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// public properties
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@synthesize actionHandler, arrowColor, textColor, activityIndicatorViewStyle, lastUpdatedDate;
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@synthesize state;
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@synthesize scrollView = _scrollView;
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@synthesize arrow, arrowImage, activityIndicatorView, titleLabel, dateLabel, dateFormatter, originalScrollViewContentInset;
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- (void)dealloc {
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[self.scrollView removeObserver:self forKeyPath:@"contentOffset"];
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}
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- (id)initWithScrollView:(UIScrollView *)scrollView {
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self = [super initWithFrame:CGRectZero];
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self.scrollView = scrollView;
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[_scrollView addSubview:self];
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// default styling values
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self.arrowColor = [UIColor grayColor];
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self.activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray;
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self.textColor = [UIColor darkGrayColor];
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self.titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 20, 150, 20)];
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titleLabel.text = NSLocalizedString(@"Pull to refresh...",);
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titleLabel.font = [UIFont boldSystemFontOfSize:14];
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titleLabel.backgroundColor = [UIColor clearColor];
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titleLabel.textColor = textColor;
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[self addSubview:titleLabel];
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[self addSubview:self.arrow];
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[scrollView addObserver:self forKeyPath:@"contentOffset" options:NSKeyValueObservingOptionNew context:nil];
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[scrollView addObserver:self forKeyPath:@"frame" options:NSKeyValueObservingOptionNew context:nil];
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self.originalScrollViewContentInset = scrollView.contentInset;
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self.state = SVPullToRefreshStateHidden;
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self.frame = CGRectMake(0, -60, scrollView.bounds.size.width, 60);
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return self;
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}
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- (void)layoutSubviews {
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CGFloat remainingWidth = self.superview.bounds.size.width-200;
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float position = 0.50;
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CGRect titleFrame = titleLabel.frame;
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titleFrame.origin.x = ceil(remainingWidth*position+44);
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titleLabel.frame = titleFrame;
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CGRect dateFrame = dateLabel.frame;
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dateFrame.origin.x = titleFrame.origin.x;
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dateLabel.frame = dateFrame;
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CGRect arrowFrame = arrow.frame;
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arrowFrame.origin.x = ceil(remainingWidth*position);
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arrow.frame = arrowFrame;
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self.activityIndicatorView.center = self.arrow.center;
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}
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#pragma mark - Getters
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- (UIImageView *)arrow {
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if(!arrow) {
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arrow = [[UIImageView alloc] initWithImage:self.arrowImage];
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arrow.frame = CGRectMake(0, 6, 22, 48);
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arrow.backgroundColor = [UIColor clearColor];
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}
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return arrow;
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}
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- (UIImage *)arrowImage {
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CGRect rect = CGRectMake(0, 0, 22, 48);
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UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0);
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CGContextRef context = UIGraphicsGetCurrentContext();
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[[UIColor clearColor] set];
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CGContextFillRect(context, rect);
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[self.arrowColor set];
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CGContextTranslateCTM(context, 0, rect.size.height);
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CGContextScaleCTM(context, 1.0, -1.0);
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CGContextClipToMask(context, rect, [[UIImage imageNamed:@"SVPullToRefresh.bundle/arrow"] CGImage]);
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CGContextFillRect(context, rect);
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UIImage *output = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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return output;
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}
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- (UIActivityIndicatorView *)activityIndicatorView {
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if(!activityIndicatorView) {
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activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
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activityIndicatorView.hidesWhenStopped = YES;
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[self addSubview:activityIndicatorView];
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}
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return activityIndicatorView;
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}
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- (UILabel *)dateLabel {
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if(!dateLabel) {
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dateLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 28, 180, 20)];
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dateLabel.font = [UIFont systemFontOfSize:12];
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dateLabel.backgroundColor = [UIColor clearColor];
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dateLabel.textColor = textColor;
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[self addSubview:dateLabel];
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CGRect titleFrame = titleLabel.frame;
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titleFrame.origin.y = 12;
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titleLabel.frame = titleFrame;
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}
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return dateLabel;
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}
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- (NSDateFormatter *)dateFormatter {
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if(!dateFormatter) {
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dateFormatter = [[NSDateFormatter alloc] init];
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[dateFormatter setDateStyle:NSDateFormatterShortStyle];
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[dateFormatter setTimeStyle:NSDateFormatterShortStyle];
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dateFormatter.locale = [NSLocale currentLocale];
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}
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return dateFormatter;
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}
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#pragma mark - Setters
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- (void)setArrowColor:(UIColor *)newArrowColor {
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arrowColor = newArrowColor;
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self.arrow.image = self.arrowImage;
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}
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- (void)setTextColor:(UIColor *)newTextColor {
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textColor = newTextColor;
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titleLabel.textColor = newTextColor;
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dateLabel.textColor = newTextColor;
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}
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- (void)setActivityIndicatorViewStyle:(UIActivityIndicatorViewStyle)viewStyle {
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self.activityIndicatorView.activityIndicatorViewStyle = viewStyle;
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}
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- (void)setScrollViewContentInset:(UIEdgeInsets)contentInset {
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[UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionAllowUserInteraction|UIViewAnimationOptionBeginFromCurrentState animations:^{
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self.scrollView.contentInset = contentInset;
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} completion:^(BOOL finished) {
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if(self.state == SVPullToRefreshStateHidden && contentInset.top == self.originalScrollViewContentInset.top)
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[UIView animateWithDuration:0.2 delay:0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
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arrow.alpha = 0;
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} completion:NULL];
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}];
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}
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- (void)setLastUpdatedDate:(NSDate *)newLastUpdatedDate {
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self.dateLabel.text = [NSString stringWithFormat:NSLocalizedString(@"Last Updated: %@",), newLastUpdatedDate?[self.dateFormatter stringFromDate:newLastUpdatedDate]:NSLocalizedString(@"Never",)];
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}
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#pragma mark -
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- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
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if([keyPath isEqualToString:@"contentOffset"] && self.state != SVPullToRefreshStateLoading)
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[self scrollViewDidScroll:[[change valueForKey:NSKeyValueChangeNewKey] CGPointValue]];
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else if([keyPath isEqualToString:@"frame"])
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[self layoutSubviews];
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}
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- (void)scrollViewDidScroll:(CGPoint)contentOffset {
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CGFloat scrollOffsetThreshold = self.frame.origin.y-self.originalScrollViewContentInset.top;
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if(!self.scrollView.isDragging && self.state == SVPullToRefreshStateTriggered)
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self.state = SVPullToRefreshStateLoading;
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else if(contentOffset.y > scrollOffsetThreshold && contentOffset.y < -self.originalScrollViewContentInset.top && self.scrollView.isDragging && self.state != SVPullToRefreshStateLoading)
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self.state = SVPullToRefreshStateVisible;
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else if(contentOffset.y < scrollOffsetThreshold && self.scrollView.isDragging && self.state == SVPullToRefreshStateVisible)
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self.state = SVPullToRefreshStateTriggered;
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else if(contentOffset.y >= -self.originalScrollViewContentInset.top && self.state != SVPullToRefreshStateHidden)
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self.state = SVPullToRefreshStateHidden;
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}
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- (void)triggerRefresh {
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self.state = SVPullToRefreshStateLoading;
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}
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- (void)stopAnimating {
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self.state = SVPullToRefreshStateHidden;
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}
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- (void)setState:(SVPullToRefreshState)newState {
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state = newState;
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switch (newState) {
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case SVPullToRefreshStateHidden:
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titleLabel.text = NSLocalizedString(@"cube_ptr_pull_down_to_refresh",);
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[self.activityIndicatorView stopAnimating];
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[self setScrollViewContentInset:self.originalScrollViewContentInset];
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[self rotateArrow:0 hide:NO];
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break;
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case SVPullToRefreshStateVisible:
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titleLabel.text = NSLocalizedString(@"cube_ptr_pull_down_to_refresh",);
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arrow.alpha = 1;
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[self.activityIndicatorView stopAnimating];
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[self setScrollViewContentInset:self.originalScrollViewContentInset];
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[self rotateArrow:0 hide:NO];
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break;
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case SVPullToRefreshStateTriggered:
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titleLabel.text = NSLocalizedString(@"cube_ptr_release_to_refresh",);
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[self rotateArrow:M_PI hide:NO];
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break;
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case SVPullToRefreshStateLoading:
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titleLabel.text = NSLocalizedString(@"loading",);
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[self.activityIndicatorView startAnimating];
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[self setScrollViewContentInset:UIEdgeInsetsMake(self.frame.origin.y*-1+self.originalScrollViewContentInset.top, 0, 0, 0)];
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[self rotateArrow:0 hide:YES];
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if(actionHandler)
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actionHandler();
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break;
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}
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}
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- (void)rotateArrow:(float)degrees hide:(BOOL)hide {
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[UIView animateWithDuration:0.2 delay:0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
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self.arrow.layer.transform = CATransform3DMakeRotation(degrees, 0, 0, 1);
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self.arrow.layer.opacity = !hide;
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} completion:NULL];
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}
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@end
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#pragma mark - UIScrollView (SVPullToRefresh)
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#import <objc/runtime.h>
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static char UIScrollViewPullToRefreshView;
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@implementation UIScrollView (SVPullToRefresh)
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@dynamic pullToRefreshView;
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- (void)addPullToRefreshWithActionHandler:(void (^)(void))actionHandler {
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SVPullToRefresh *pullToRefreshView = [[SVPullToRefresh alloc] initWithScrollView:self];
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pullToRefreshView.actionHandler = actionHandler;
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self.pullToRefreshView = pullToRefreshView;
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}
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- (void)setPullToRefreshView:(SVPullToRefresh *)pullToRefreshView {
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[self willChangeValueForKey:@"pullToRefreshView"];
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objc_setAssociatedObject(self, &UIScrollViewPullToRefreshView,
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pullToRefreshView,
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OBJC_ASSOCIATION_ASSIGN);
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[self didChangeValueForKey:@"pullToRefreshView"];
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}
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- (SVPullToRefresh *)pullToRefreshView {
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return objc_getAssociatedObject(self, &UIScrollViewPullToRefreshView);
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}
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@end
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