92 lines
2.1 KiB
Objective-C
92 lines
2.1 KiB
Objective-C
// Copyright 2004-present Facebook. All Rights Reserved.
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#import "RCTPicker.h"
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#import "RCTConvert.h"
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#import "RCTEventDispatcher.h"
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#import "RCTUtils.h"
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#import "UIView+ReactKit.h"
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const NSInteger UNINITIALIZED_INDEX = -1;
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@interface RCTPicker() <UIPickerViewDataSource, UIPickerViewDelegate>
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{
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RCTEventDispatcher *_eventDispatcher;
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NSArray *_items;
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NSInteger _selectedIndex;
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}
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@end
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@implementation RCTPicker
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- (id)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher
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{
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if (self = [super initWithFrame:CGRectZero]) {
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_eventDispatcher = eventDispatcher;
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_selectedIndex = UNINITIALIZED_INDEX;
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self.delegate = self;
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}
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return self;
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}
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- (void)setItems:(NSArray *)items
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{
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if (_items != items) {
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_items = [items copy];
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[self setNeedsLayout];
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}
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}
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- (void)setSelectedIndex:(NSInteger)selectedIndex
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{
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if (_selectedIndex != selectedIndex) {
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BOOL animated = _selectedIndex != UNINITIALIZED_INDEX; // Don't animate the initial value
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_selectedIndex = selectedIndex;
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dispatch_async(dispatch_get_main_queue(), ^{
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[self selectRow:selectedIndex inComponent:0 animated:animated];
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});
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}
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}
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#pragma mark - UIPickerViewDataSource protocol
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- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
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{
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return 1;
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}
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- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
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{
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return [_items count];
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}
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#pragma mark - UIPickerViewDelegate methods
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- (NSDictionary *)itemForRow:(NSInteger)row
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{
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return (NSDictionary*)[_items objectAtIndex:row];
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}
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- (id)valueForRow:(NSInteger)row
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{
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return [self itemForRow:row][@"value"];
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}
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- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
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{
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return [self itemForRow:row][@"label"];
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}
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- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
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{
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_selectedIndex = row;
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NSDictionary *event = @{
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@"target": self.reactTag,
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@"newIndex": @(row),
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@"newValue": [self valueForRow:row]
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};
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[_eventDispatcher sendInputEventWithName:@"topChange" body:event];
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}
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@end
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