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Since ffigen added support for [`NativeCallable.listener`](https://api.flutter.dev/flutter/dart-ffi/NativeCallable/NativeCallable.listener.html) to its ObjC bindings, this example can be simplified. We can replace the `Dart_Port` logic with `ObjCBlock.listener`, which lets us get rid of most of the native code. We still need a small bit of native code to `retain` a reference to the callback's arguments before invoking the listener, otherwise the arguments may be ref counted and deleted before the Dart side of the callback is invoked. See https://github.com/dart-lang/native/issues/835
13 lines
410 B
Objective-C
13 lines
410 B
Objective-C
#import "pedometerHelper.h"
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#import <CoreMotion/CoreMotion.h>
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#import <CoreMotion/CMPedometer.h>
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#import <Foundation/Foundation.h>
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// TODO(https://github.com/dart-lang/native/issues/835): Generate this wrapper
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// automatically.
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CMPedometerHandler wrapCallback(CMPedometerHandler callback) {
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return [^(CMPedometerData *data, NSError *error) {
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return callback([data retain], [error retain]);
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} copy];
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}
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