快速创建带有for循环的字典

Question

I just want to create a dictionary with the help of for loop sample code :

var counter: Int = 1;
var pageCountDict = [String:Any]();
    for filterCount in counter..<6
    {
       if let count = "page_\(filterCount)_vtime" as? String
       {
          pageCountDict = [count: timeInterval_Int];
       }
    }
print(pageCountDict);

This print command give me only last value of forloop
I just want all the value of this variable pageCountDict in a dictonary

Answer 1

The way to assign to a dictionary is first use the subscript and assign the value to it:

pageCountDict[YourKey] = YourValue

Also, you can see many examples and explanations in Apple documentation regarding dictionaries.

Answer 2

With each loop, you are replacing the dictionary with one that contains only one element. What you want to do is this :

pageCountDict[count] = timeInterval_Int

Also, you shouldn't need the as? String as? String part. This should be sufficient :

for filterCount in counter..<6
{
    pageCountDict[count] = "page_\(filterCount)_vtime"
}

Answer 3

var pageCountDict = [String:Any]()

You can add values to this dictionary by merging previous contents and new data as follows...

let counter: Int = 1
var pageCountDict = [String:Any]()
for filterCount in counter..<6
{
   let value = 9
   let count = "page_\(filterCount)_vtime" //'if' is not needed as it is always true
   pageCountDict.merge([count: timeInterval_Int], uniquingKeysWith:{ (key, value) -> Any in
        //assign value for similar key
        timeInterval_Int
    })
}
print(pageCountDict)`