react-native/React/Views/RCTRefreshControl.m

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/**
* 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 _initialRefreshingState;
BOOL _isInitialRender;
BOOL _currentRefreshingState;
}
- (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];
// If the control is refreshing when mounted we need to call
// beginRefreshing in layoutSubview or it doesn't work.
if (_isInitialRender && _initialRefreshingState) {
[self beginRefreshing];
}
_isInitialRender = false;
}
- (void)beginRefreshing
{
// 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};
// Don't animate when the prop is set initialy.
if (_isInitialRender) {
scrollView.contentOffset = offset;
[super beginRefreshing];
} else {
// `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)endRefreshing
{
// 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 (scrollView.contentOffset.y < 0) {
CGPoint offset = {scrollView.contentOffset.x, -scrollView.contentInset.top};
[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 self.attributedTitle.string;
}
- (void)setTitle:(NSString *)title
{
NSRange range = NSMakeRange(0, self.attributedTitle.length);
NSDictionary *attrs = [self.attributedTitle attributesAtIndex:0 effectiveRange: &range];
self.attributedTitle = [[NSAttributedString alloc] initWithString:title attributes:attrs];
}
- (void)setTitleColor:(UIColor *)color
{
NSRange range = NSMakeRange(0, self.attributedTitle.length);
NSDictionary *attrs = [self.attributedTitle attributesAtIndex:0 effectiveRange: &range];
NSMutableDictionary *attrsMutable = [attrs mutableCopy];
[attrsMutable setObject:color forKey:NSForegroundColorAttributeName];
self.attributedTitle = [[NSAttributedString alloc] initWithString:self.attributedTitle.string attributes:attrsMutable];
}
- (void)setRefreshing:(BOOL)refreshing
{
if (_currentRefreshingState != refreshing) {
_currentRefreshingState = refreshing;
if (refreshing) {
// If it is the initial render, beginRefreshing will get called
// in layoutSubviews.
if (_isInitialRender) {
_initialRefreshingState = refreshing;
} else {
[self beginRefreshing];
}
} else {
[self endRefreshing];
}
}
}
- (void)refreshControlValueChanged
{
_currentRefreshingState = super.refreshing;
if (_onRefresh) {
_onRefresh(nil);
}
}
@end