[英]Add items from a String:Int dictionary to UITableView on iOS using Swift
[英]Add items from 1 Dictionary to another Dictionary -Swift iOS9
在buttonPressed动作中,首先运行函数addSodas()。 第二,我用不同的值填充foodDict。 我需要将两个字典附加在一起,以便foodDict包含所有苏打水及其当前值。
我遇到的问题是必须首先执行addSodas()函数(我别无选择)。 既然那是第一,而foodDict是第二,那么我该如何结合两个字典呢?
class ViewController: UIViewController {
//soda values already in the sodaArray
var sodaArray = ["Coke", "Pepsi", "Gingerale"]
//I add the soda values to this empty array(I have no choice)
var sodaMachineArray = [String]()
//This is a food dictionary I want to add the sodas in
var foodDict = [String: AnyObject]()
override func viewDidLoad() {
super.viewDidLoad()
}
//Function to add sodas to the foodDict
func addSodas(){
//Here I append the sodas into the sodaMachineArray
for soda in self.sodaArray {
self.sodaMachineArray.append(soda)
}
//I take the sodaMachineArray, grab each index, cast it as a String, and use that as the Key for the key/value pair
for (index, value) in self.sodaMachineArray.enumerate(){
self.foodDict[String(index)] = value
}
print("\nA. \(self.foodDict)\n")
}
//Button
@IBAction func buttonPressed(sender: UIButton) {
self.addSodas()
print("\nB. \(self.foodDict)\n")
self.foodDict = ["KFC": "Chicken", "PizzaHut": "Pizza", "McDonalds":"Burger"]
print("\nD. food and soda key/values should print here: \(self.foodDict)???\n")
/*I need the final outcome to look like this
self.foodDict = ["0": Coke, "McDonalds": Burger, "1": Pepsi, "KFC": Chicken, "2": Gingerale, "PizzaHut": Pizza]*/
}
}
顺便说一句,我知道我可以在下面用此方法扩展Dictionary,但是在这种情况下没有用,因为必须在foodDict填满之前添加addSodas()函数。 此扩展名有效,但我无法在我的方案中使用它。
extension Dictionary {
mutating func appendThisDictWithKeyValuePairsFromAnotherDict(anotherDict:Dictionary) {
for (key,value) in anotherDict {
self.updateValue(value, forKey:key)
}
}
}
问题:
self.foodDict = ["KFC": "Chicken", "PizzaHut": "Pizza", "McDonalds":"Burger"]
该行创建新数组并分配这些值。
解:
例:
//Button
@IBAction func buttonPressed(sender: UIButton) {
self.addSodas()
print("\nB. \(self.foodDict)\n")
var tempFoodDict = ["KFC": "Chicken", "PizzaHut": "Pizza", "McDonalds":"Burger"]
for (key, value) in tempFoodDict {
self.foodDict[String(key)] = String(value)
}
print("\nD. food and soda key/values should print here: \(self.foodDict)???\n")
}
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