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