使用正确的 reactTag 响应本机 iOS 本机视图发送事件 [英] React Native iOS Native View send event with proper reactTag
问题描述
我有一个 iOS Native View,它是一个带有地图视图和 UIView 的 UIView.该地图有一个名为regionDidChangeAnimated"的事件,我想将事件发送到 React Native.但是 reactTag 不对.
I have a iOS Native View which is a UIView with a map view and a UIView. The map has a event called 'regionDidChangeAnimated', I want to send event to the React Native. But the reactTag is not right.
- (UIView *)view
{
CGRect screenRect = [[UIScreen mainScreen] bounds];
UIView *frameView = [[UIView alloc] initWithFrame:screenRect];
CGRect frameRect = frameView.bounds;
MAMapView *mapView;
mapView = [[MAMapView alloc] initWithFrame:frameRect];
self.mapview = mapView;
mapView.delegate = self;
[frameView addSubview:mapView];
RCTFixedPin* pin = [[RCTFixedPin alloc] initWithFrame:CGRectMake(0, 0, screenRect.size.width, 260)];
pin.userInteractionEnabled = NO;
[frameView addSubview:pin];
return frameView;
}
- (void)mapView:(MAMapView *)mapView regionDidChangeAnimated:(BOOL)animated {
if (self.dragging) {
self.dragging = NO;
}
MACoordinateRegion region = mapView.region;
NSDictionary *event = @{
***@"target": ,***
@"region": @{
@"latitude": @(region.center.latitude),
@"longitude": @(region.center.longitude),
@"latitudeDelta": @(region.span.latitudeDelta),
@"longitudeDelta": @(region.span.longitudeDelta),
}
};
[self.bridge.eventDispatcher sendInputEventWithName:@"topChange" body:event];
}
推荐答案
如果你查看他们已经实现的原生视图的 react-native 代码:
If you look in the react-native code for the native views they have implemented:
https://github.com/facebook/react-native/树/主/反应/视图
看起来文档已经过时,而不是使用:
it looks like the documentation is out of date and rather than using:
[self.bridge.eventDispatcher sendInputEventWithName...
您应该执行以下操作:
@property (nonatomic, copy) RCTBubblingEventBlock onTopChange;
self.onTopChange(@{
@"region": @{
@"latitude": @(region.center.latitude),
@"longitude": @(region.center.longitude),
@"latitudeDelta": @(region.span.latitudeDelta),
@"longitudeDelta": @(region.span.longitudeDelta),
}
};
还有一个 RCTDirectEventBlock
我不确定它和 RCTBubblingEventBlock
There's also a RCTDirectEventBlock
I'm not sure what the difference is between that and RCTBubblingEventBlock
查看 RCTComponent.m
第 160-169 行,它应该会自动为您处理目标设置:
Looking in RCTComponent.m
lines 160-169 it should handle the target setting for you automatically:
// Special case for event handlers
__weak RCTViewManager *weakManager = _manager;
setterBlock = ^(id target, __unused id source, id json) {
__weak id<RCTComponent> weakTarget = target;
((void (*)(id, SEL, id))objc_msgSend)(target, setter, [RCTConvert BOOL:json] ? ^(NSDictionary *body) {
body = [NSMutableDictionary dictionaryWithDictionary:body];
((NSMutableDictionary *)body)[@"target"] = weakTarget.reactTag;
[weakManager.bridge.eventDispatcher sendInputEventWithName:RCTNormalizeInputEventName(name) body:body];
} : nil);
};
同样在 Manager 类中确保添加:
Also in the Manager class make sure you add:
RCT_EXPORT_VIEW_PROPERTY(onTopChange, RCTBubblingEventBlock)
并且不要忘记在 JSX 中实际连接事件:
And don't forget to actually wire up the event in your JSX:
<MyComponent onTopChange={this.handleOnTopChange}/>
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