RCTPicker.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 "RCTPicker.h"
#import "RCTConvert.h"
#import "RCTUtils.h"
@interface RCTPicker() <UIPickerViewDataSource, UIPickerViewDelegate>
@end
@implementation RCTPicker
- (instancetype)initWithFrame:(CGRect)frame
{
if ((self = [super initWithFrame:frame])) {
_color = [UIColor blackColor];
_font = [UIFont systemFontOfSize:21]; // TODO: selected title default should be 23.5
_selectedIndex = NSNotFound;
_textAlign = NSTextAlignmentCenter;
self.delegate = self;
}
return self;
}
RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
- (void)setItems:(NSArray<NSDictionary *> *)items
{
_items = [items copy];
[self setNeedsLayout];
}
- (void)setSelectedIndex:(NSInteger)selectedIndex
{
if (_selectedIndex != selectedIndex) {
BOOL animated = _selectedIndex != NSNotFound; // Don't animate the initial value
_selectedIndex = selectedIndex;
dispatch_async(dispatch_get_main_queue(), ^{
[self selectRow:selectedIndex inComponent:0 animated:animated];
});
}
}
#pragma mark - UIPickerViewDataSource protocol
- (NSInteger)numberOfComponentsInPickerView:(__unused UIPickerView *)pickerView
{
return 1;
}
- (NSInteger)pickerView:(__unused UIPickerView *)pickerView
numberOfRowsInComponent:(__unused NSInteger)component
{
return _items.count;
}
#pragma mark - UIPickerViewDelegate methods
- (NSString *)pickerView:(__unused UIPickerView *)pickerView
titleForRow:(NSInteger)row
forComponent:(__unused NSInteger)component
{
return [RCTConvert NSString:_items[row][@"label"]];
}
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component {
return _font.pointSize + 19;
}
- (UIView *)pickerView:(UIPickerView *)pickerView
viewForRow:(NSInteger)row
forComponent:(NSInteger)component
reusingView:(UILabel *)label
{
if (!label) {
label = [[UILabel alloc] initWithFrame:(CGRect){
CGPointZero,
{
[pickerView rowSizeForComponent:component].width,
[pickerView rowSizeForComponent:component].height,
}
}];
}
label.font = _font;
label.textColor = [RCTConvert UIColor:_items[row][@"textColor"]] ?: _color;
label.textAlignment = _textAlign;
label.text = [self pickerView:pickerView titleForRow:row forComponent:component];
return label;
}
- (void)pickerView:(__unused UIPickerView *)pickerView
didSelectRow:(NSInteger)row inComponent:(__unused NSInteger)component
{
_selectedIndex = row;
if (_onChange && _items.count > (NSUInteger)row) {
_onChange(@{
@"newIndex": @(row),
@"newValue": RCTNullIfNil(_items[row][@"value"]),
});
}
}
@end