Replace RCT_EXPORT with RCT_EXPORT_METHOD

This commit is contained in:
Brent Vatne 2015-04-10 13:23:59 -07:00
parent 7047d6e191
commit 127649962d
2 changed files with 16 additions and 18 deletions

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@ -119,7 +119,7 @@ var GeoInfo = React.createClass({
## Extensibility
It is certainly possible to create a great app using React Native without writing a single line of native code, but React Native is also designed to be easily extended with custom native views and modules - that means you can reuse anything you've already built, and can import and use your favorite native libraries. To create a simple module in iOS, create a new class that implements the `RCTBridgeModule` protocol, and add `RCT_EXPORT` to the function you want to make available in JavaScript.
It is certainly possible to create a great app using React Native without writing a single line of native code, but React Native is also designed to be easily extended with custom native views and modules - that means you can reuse anything you've already built, and can import and use your favorite native libraries. To create a simple module in iOS, create a new class that implements the `RCTBridgeModule` protocol, and wrap the function that you want to make available to JavaScript in `RCT_EXPORT_METHOD`. Additionally, the class itself must be explicitly exported with `RCT_EXPORT_MODULE();`.
```objc
// Objective-C
@ -130,9 +130,12 @@ It is certainly possible to create a great app using React Native without writin
@end
@implementation MyCustomModule
- (void)processString:(NSString *)input callback:(RCTResponseSenderBlock)callback
RCT_EXPORT_MODULE();
// Available as NativeModules.MyCustomModule.processString
RCT_EXPORT_METHOD(processString:(NSString *)input callback:(RCTResponseSenderBlock)callback)
{
RCT_EXPORT(); // available as NativeModules.MyCustomModule.processString
callback(@[[input stringByReplacingOccurrencesOfString:@"Goodbye" withString:@"Hello"]]);
}
@end

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@ -28,15 +28,16 @@ Native module is just an Objectve-C class that implements `RCTBridgeModule` prot
@end
```
React Native will not expose any methods of `CalendarManager` to JavaScript unless explicitly asked. Fortunately this is pretty easy with `RCT_EXPORT`:
React Native will not expose any methods of `CalendarManager` to JavaScript unless explicitly asked. Fortunately this is pretty easy with `RCT_EXPORT_METHOD`:
```objective-c
// CalendarManager.m
@implementation CalendarManager
- (void)addEventWithName:(NSString *)name location:(NSString *)location
RCT_EXPORT_MODULE();
RCT_EXPORT_METHOD(addEvent:(NSString *)name location:(NSString *)location)
{
RCT_EXPORT();
RCTLogInfo(@"Pretending to create an event %@ at %@", name, location);
}
@ -47,12 +48,10 @@ Now from your JavaScript file you can call the method like this:
```javascript
var CalendarManager = require('NativeModules').CalendarManager;
CalendarManager.addEventWithName('Birthday Party', '4 Privet Drive, Surrey');
CalendarManager.addEvent('Birthday Party', '4 Privet Drive, Surrey');
```
Notice that the exported method name was generated from first part of Objective-C selector. Sometimes it results in a non-idiomatic JavaScript name (like the one in our example). You can change the name by supplying an optional argument to `RCT_EXPORT`, e.g. `RCT_EXPORT(addEvent)`.
The return type of the method should always be `void`. React Native bridge is asynchronous, so the only way to pass a result to JavaScript is by using callbacks or emitting events (see below).
The return type of bridge methods is always `void`. React Native bridge is asynchronous, so the only way to pass a result to JavaScript is by using callbacks or emitting events (see below).
## Argument types
@ -68,9 +67,8 @@ React Native supports several types of arguments that can be passed from JavaScr
In our `CalendarManager` example, if we want to pass event date to native, we have to convert it to a string or a number:
```objective-c
- (void)addEventWithName:(NSString *)name location:(NSString *)location date:(NSInteger)secondsSinceUnixEpoch
RCT_EXPORT_METHOD(addEvent:(NSString *)name location:(NSString *)location date:(NSInteger)secondsSinceUnixEpoch)
{
RCT_EXPORT(addEvent);
NSDate *date = [NSDate dateWithTimeIntervalSince1970:secondsSinceUnixEpoch];
}
```
@ -80,9 +78,8 @@ As `CalendarManager.addEvent` method gets more and more complex, the number of a
```objective-c
#import "RCTConvert.h"
- (void)addEventWithName:(NSString *)name details:(NSDictionary *)details
RCT_EXPORT_METHOD(addEvent:(NSString *)name details:(NSDictionary *)details)
{
RCT_EXPORT(addEvent);
NSString *location = [RCTConvert NSString:details[@"location"]]; // ensure location is a string
...
}
@ -112,9 +109,8 @@ CalendarManager.addEvent('Birthday Party', {
Native module also supports a special kind of argument- a callback. In most cases it is used to provide the function call result to JavaScript.
```objective-c
- (void)findEvents:(RCTResponseSenderBlock)callback
RCT_EXPORT_METHOD(findEvents:(RCTResponseSenderBlock)callback)
{
RCT_EXPORT();
NSArray *events = ...
callback(@[[NSNull null], events]);
}
@ -142,9 +138,8 @@ The native module should not have any assumptions about what thread it is being
```objective-c
- (void)addEventWithName:(NSString *)name callback:(RCTResponseSenderBlock)callback
RCT_EXPORT_METHOD(addEvent:(NSString *)name callback:(RCTResponseSenderBlock)callback)
{
RCT_EXPORT(addEvent);
dispatch_async(dispatch_get_main_queue(), ^{
// Call iOS API on main thread
...