137 lines
4.2 KiB
Objective-C
137 lines
4.2 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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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 _initialRefreshingState;
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BOOL _isInitialRender;
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BOOL _currentRefreshingState;
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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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// 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 (_isInitialRender && _initialRefreshingState) {
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[self beginRefreshing];
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}
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_isInitialRender = false;
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}
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- (void)beginRefreshing
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{
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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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// Don't animate when the prop is set initialy.
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if (_isInitialRender) {
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scrollView.contentOffset = offset;
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[super beginRefreshing];
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} else {
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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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}
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- (void)endRefreshing
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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 (scrollView.contentOffset.y < 0) {
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CGPoint offset = {scrollView.contentOffset.x, -scrollView.contentInset.top};
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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 self.attributedTitle.string;
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}
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- (void)setTitle:(NSString *)title
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{
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NSRange range = NSMakeRange(0, self.attributedTitle.length);
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NSDictionary *attrs = [self.attributedTitle attributesAtIndex:0 effectiveRange: &range];
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self.attributedTitle = [[NSAttributedString alloc] initWithString:title attributes:attrs];
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}
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- (void)setTitleColor:(UIColor *)color
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{
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NSRange range = NSMakeRange(0, self.attributedTitle.length);
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NSDictionary *attrs = [self.attributedTitle attributesAtIndex:0 effectiveRange: &range];
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NSMutableDictionary *attrsMutable = [attrs mutableCopy];
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[attrsMutable setObject:color forKey:NSForegroundColorAttributeName];
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self.attributedTitle = [[NSAttributedString alloc] initWithString:self.attributedTitle.string attributes:attrsMutable];
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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 it is the initial render, beginRefreshing will get called
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// in layoutSubviews.
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if (_isInitialRender) {
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_initialRefreshingState = refreshing;
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} else {
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[self beginRefreshing];
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}
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} else {
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[self endRefreshing];
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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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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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