/** * Copyright (c) 2015-present, Facebook, Inc. * All rights reserved. * * This source code is licensed under the BSD-style license found in the * LICENSE file in the root directory of this source tree. An additional grant * of patent rights can be found in the PATENTS file in the same directory. */ #import "RCTRefreshControl.h" #import "RCTUtils.h" @implementation RCTRefreshControl { BOOL _isInitialRender; BOOL _currentRefreshingState; BOOL _refreshingProgrammatically; NSString *_title; UIColor *_titleColor; } - (instancetype)init { if ((self = [super init])) { [self addTarget:self action:@selector(refreshControlValueChanged) forControlEvents:UIControlEventValueChanged]; _isInitialRender = true; _currentRefreshingState = false; } return self; } RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder) - (void)layoutSubviews { [super layoutSubviews]; // Fix for bug #7976 // TODO: Remove when updating to use iOS 10 refreshControl UIScrollView prop. if (self.backgroundColor == nil) { self.backgroundColor = [UIColor clearColor]; } // If the control is refreshing when mounted we need to call // beginRefreshing in layoutSubview or it doesn't work. if (_currentRefreshingState && _isInitialRender) { [self beginRefreshing]; } _isInitialRender = false; } - (void)beginRefreshingProgrammatically { _refreshingProgrammatically = YES; // When using begin refreshing we need to adjust the ScrollView content offset manually. UIScrollView *scrollView = (UIScrollView *)self.superview; CGPoint offset = {scrollView.contentOffset.x, scrollView.contentOffset.y - self.frame.size.height}; // `beginRefreshing` must be called after the animation is done. This is why it is impossible // to use `setContentOffset` with `animated:YES`. [UIView animateWithDuration:0.25 delay:0 options:UIViewAnimationOptionBeginFromCurrentState animations:^(void) { [scrollView setContentOffset:offset]; } completion:^(__unused BOOL finished) { [super beginRefreshing]; }]; } - (void)endRefreshingProgrammatically { // The contentOffset of the scrollview MUST be greater than 0 before calling // endRefreshing otherwise the next pull to refresh will not work properly. UIScrollView *scrollView = (UIScrollView *)self.superview; if (_refreshingProgrammatically && scrollView.contentOffset.y < 0) { CGPoint offset = {scrollView.contentOffset.x, 0}; [UIView animateWithDuration:0.25 delay:0 options:UIViewAnimationOptionBeginFromCurrentState animations:^(void) { [scrollView setContentOffset:offset]; } completion:^(__unused BOOL finished) { [super endRefreshing]; }]; } else { [super endRefreshing]; } } - (NSString *)title { return _title; } - (void)setTitle:(NSString *)title { _title = title; [self _updateTitle]; } - (void)setTitleColor:(UIColor *)color { _titleColor = color; [self _updateTitle]; } - (void)_updateTitle { if (!_title) { return; } NSMutableDictionary *attributes = [NSMutableDictionary dictionary]; if (_titleColor) { attributes[NSForegroundColorAttributeName] = _titleColor; } self.attributedTitle = [[NSAttributedString alloc] initWithString:_title attributes:attributes]; } - (void)setRefreshing:(BOOL)refreshing { if (_currentRefreshingState != refreshing) { _currentRefreshingState = refreshing; if (refreshing) { if (!_isInitialRender) { [self beginRefreshingProgrammatically]; } } else { [self endRefreshingProgrammatically]; } } } - (void)refreshControlValueChanged { _currentRefreshingState = super.refreshing; _refreshingProgrammatically = NO; if (_onRefresh) { _onRefresh(nil); } } @end