在for循环中键入强制转换数组元素

Question

在委托方法中,我得到一个自定义对象类型的"结果"数组,我想循环遍历数组元素.我现在做以下,这是有效的

for result in results {
    if result is XYZClass {     
        //This Works!    
    }
}

有没有办法在for循环中输入对象以避免写两行？swift允许这个吗？用于在Objective-C中相当容易地完成此操作

for (XYZClass *result in results) {

}

但是,我没有在Swift中取得成功.我试过没有运气的显式演员.

for result as XYZClass in results {
    //ERROR: Expected ‘;’ in ‘for’ statements
}

for result:AGSGPParameterValue in results {
    /* ERROR: This prompts down cast as 
    for result:AGSGPParameterValue in results as AGSGPParameterValue { }
    which in turn errors again “Type XYZClass does not conform to Sequence Type”
*/
}

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Answer 1

试试这个:

for result in results as [XYZClass] {
    // Do stuff to result
}