C-structs、NSObjects、float、int、double、，

首先：这是一个问题，很抱歉，但我希望有人能帮助我

我正在iPhone上制作UIML渲染器。UIML是一种描述接口的语言。 我想在iPhone上呈现XML并显示界面

为了更好地通知您，我首先解释一下我在做什么：

<?xml version="1.0"?>
<uiml>
    <interface>
        <structure>
          <part id="hoofdView" class="ViewController">
              <part id="viewVoorHoofdview" class="View">
                <part id="label1" class="Label"/>
              </part>
          </part>
        </structure>
        <style>
            <property part-name="label1" name="text">Dit is een label</property>
            <property part-name="label1" name="position">50,50,100,150</property>
        </style>
    </interface>
    <peers>
        <presentation base="cocoa.uiml"/>
    </peers>
</uiml>

然后我必须将这些属性应用到createdObject。 我们有两个属性：文本和位置

我们在词汇表中查找它们，让我们以位置为例

<d-property id="position" maps-type="setMethod" maps-to="setFrame:">
               <d-param type="CGRect"/>
            </d-property>

因为CGRect不是NSObject*

例如，当我必须将浮点传递给UISlider时，也会出现同样的问题

<d-property id="minimumValue" maps-type="setMethod" maps-to="setMinimumValue:">
           <d-param type="float"/>
        </d-property>

我调用它的方法是非常抽象的，必须是抽象的，因为我们希望在不添加代码的情况下扩展UIML文档词汇表。 这是从以下位置调用的方法：

-(void)invokeMethod:(Uproperty*)property dProperty:(DProperty *)dProperty guiElement:(NSObject *)object {
//Prepare the invocation
        SEL selector = NSSelectorFromString(dProperty.m_mapsTo);
        NSMethodSignature * signature = [ [object class] instanceMethodSignatureForSelector:selector]; 
        NSInvocation * invocation = [NSInvocation invocationWithMethodSignature:signature];

        //target, selector, arguments
        [invocation setTarget:object];
        [invocation setSelector:selector];

        //Convert the argument to the correct type with the type decoder
        DParam *dParam = [dProperty.m_dParams lastObject];
        NSObject * argument = [m_decoder convert:property.m_data parameterType:dParam.m_type]; //only 1 d-param

        //Then we can set the argument
        [invocation setArgument:&argument atIndex:2]; //2 is the first parameter (0 = self, 1 = _cmd)

        //Invoke the method
        [invocation invoke];
}

---

很抱歉这个难题，但我希望有人能帮助我

您可能希望为所有不是NSObject子类的类型构建包装器类。

---

例如，NSNumber作为浮点数、整数等的对象包装器。

是否有特定的问题？因为我看不到。

<d-property id="position" maps-type="setMethod" maps-to="setFrame:">
               <d-param type="CGRect"/>
            </d-property>

<property part-name="label1" name="position">50,50,100,150</property>

-(NSObject*)convert:(NSString*)stringToConvert;

<d-property id="minimumValue" maps-type="setMethod" maps-to="setMinimumValue:">
           <d-param type="float"/>
        </d-property>

-(NSObject *)convert:(NSString *)data parameterType:(NSString *)paramType {
    NSObject * result;

    if ( [paramType isEqualToString:@"NSString*"] ) {
        result = data;
    } else if ([paramType isEqualToString:@"float"]) {
        //HOW TO DO THIS?
    } else if ([paramType isEqualToString:@"CGRect"]) {
        //HOW TO DO THIS?
    } else {
        NSLog(@"TypeDecoder: No decoding method found for the given parameter Type: %@", paramType);
    }

    return result;
}

-(void)invokeMethod:(Uproperty*)property dProperty:(DProperty *)dProperty guiElement:(NSObject *)object {
//Prepare the invocation
        SEL selector = NSSelectorFromString(dProperty.m_mapsTo);
        NSMethodSignature * signature = [ [object class] instanceMethodSignatureForSelector:selector]; 
        NSInvocation * invocation = [NSInvocation invocationWithMethodSignature:signature];

        //target, selector, arguments
        [invocation setTarget:object];
        [invocation setSelector:selector];

        //Convert the argument to the correct type with the type decoder
        DParam *dParam = [dProperty.m_dParams lastObject];
        NSObject * argument = [m_decoder convert:property.m_data parameterType:dParam.m_type]; //only 1 d-param

        //Then we can set the argument
        [invocation setArgument:&argument atIndex:2]; //2 is the first parameter (0 = self, 1 = _cmd)

        //Invoke the method
        [invocation invoke];
}