ios - JSExport 一个多参数的 Objective-C 方法不能吗？

Question

考虑一下:

@protocol FooExport <JSExport>
- (void)method1:(NSString *)param1;
- (void)method2:(NSString *)param1 param2:(NSString *)param2;
@end

@interface Foo : NSObject <FooExport>
@end

@implementation Foo
- (void)method1:(NSString *)param1 {
    NSLog(@"method1");
}
- (void)method2:(NSString *)param1 param2:(NSString *)param2 {
    NSLog(@"method2");
}
@end

{
    sContext = [[JSContext alloc] init];
    if (sContext)
    {
        sContext[@"foo"] = [[Foo alloc] init];
        [sContext evaluateScript:@"foo.method1(\"foo\");"]; // method1 is called
        [sContext evaluateScript:@"foo.method2(\"foo\", \"bar\");"]; // method2 is NOT called
    }
}

方法 1 被调用得很好，但方法 2 从未被调用。

如果我按如下方式更改 method2:

@protocol FooExport <JSExport>
- (void)method1:(NSString *)param1;
- (void)method2:(NSString *)param1;
@end

method2 现在通过 [sContext evaluateScript:@"foo.method2(\"foo\",\"bar\");"]; (我必须通过 JSContext.currentArguments 挖掘出第二个参数)。

同样，如果我按如下方式更改 method2:

@protocol FooExport - (void)method1:(NSString *)param1; - (无效)方法 2； @结束

method2 再次通过 [sContext evaluateScript:@"foo.method2(\"foo\",\"bar\");"]; (而且我必须通过 JSContext.currentArguments 挖掘出这两个参数)。

这是设计使然吗？ JSContext.currentArguments 的缺点是我必须处理 JSValues 而不是已经转换的 Objective-C 类型。

Answer 1

快速阅读 JSContext.h 会发现这颗 gem :

// When a selector that takes one or more arguments is converted to a JavaScript
// property name, by default a property name will be generated by performing the
// following conversion:
//  - All colons are removed from the selector
//  - Any lowercase letter that had followed a colon will be capitalized.
// Under the default conversion a selector "doFoo:withBar:" will be exported as
// "doFooWithBar". The default conversion may be overriden using the JSExportAs
// macro, for example to export a method "doFoo:withBar:" as "doFoo":
//
//    @protocol MyClassJavaScriptMethods <JSExport>
//    JSExportAs(doFoo,
//    - (void)doFoo:(id)foo withBar:(id)bar
//    );
//    @end
//
// Note that the JSExport macro may only be applied to a selector that takes one
// or more argument.
#define JSExportAs(PropertyName, Selector) \
    @optional Selector __JS_EXPORT_AS__##PropertyName:(id)argument; @required Selector