RCTRefreshControl.m
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#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 beginRefreshingProgrammatically];
}
_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