＆＃39;的NSDictionary＆＃39？;没有名为＆＃39; Generator＆＃39;的成员

Question

我有plist个文件，dictionary类型，并尝试阅读其内容：

循环遍历NSDictionary：

的代码

let inputFile = NSBundle.mainBundle().pathForResource("frames", ofType: "plist")

let inputDataDictionary = NSDictionary(contentsOfFile: inputFile!)
for inputItem in inputDataDictionary {
    println(inputItem)
}

但它说：

'NSDictionary?' does not have a member named 'Generator'

Answer 1

问题是inputDataDictionary是可选的。您必须通过!打开它或在枚举前用if let检查值。另请注意，迭代字典的推荐方法是通过元组。像这样：

if let dict = inputDataDictionary {
    for (key, value) in dict {
        println("\(key), \(value)")
    }
}

Answer 2

尝试：

for inputItem in inputDataDictionary.allKeys {
    println(inputItem)
}

或者您也可以使用：

for (key, object) in inputDataDictionary {
    println(key)
    println(object)
}