本文介绍了无法快速加载viewDidLoad()中的函数的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
无法快速加载viewDidLoad()中的功能.它给出错误definition conflict with previous value" at "func joinString(#strings: String...) -> String {
Unable to overload function in viewDidLoad() in swift.It gives error definition conflict with previous value" at "func joinString(#strings: String...) -> String {
override func viewDidLoad() {
super.viewDidLoad()
func joinString(#strings: String[]) -> String {
var str = ""
for s in strings {
str += s
}
return str
}
func joinString(#strings: String...) -> String {
return joinString(strings: strings)
}
println(joinString(strings : ["I", "am", "an", "array"]))
println(joinString(strings : "I", "am", "an", "array"))
}
推荐答案
对我来说，这似乎是一个Swift错误(或未记录的限制).函数/方法重载通常可以正常工作，即使使用数组vs可变参数也是如此:
This looks like a Swift bug (or an undocumented restriction) to me.Function/method overloading works generally, even with array vs variadic parameters:
class MyClass {
func foo(arg: Int) { println("An integer") }
func foo(arg: Double) { println("A double") }
func joinString(#strings: String[]) { println("An array") }
func joinString(#strings: String...) { println("Variadic parameters")}
func test() {
foo(2)
foo(3.14)
joinString(strings : ["I", "am", "an", "array"])
joinString(strings : "I", "am", "an", "array")
}
}
并产生预期的输出:
An integer
A double
An array
Variadic parameters
但是重载不适用于嵌套函数:
class MyClass {
func test() {
func foo(arg: Int) { println("An integer") }
func foo(arg: Double) { println("A double") }
// error: definition conflicts with previous value
func joinString(#strings: String[]) { println("An array") }
func joinString(#strings: String...) { println("Variadic parameters")}
// error: definition conflicts with previous value
func test() {
foo(2)
foo(3.14)
joinString(strings : ["I", "am", "an", "array"])
joinString(strings : "I", "am", "an", "array")
}
}
}
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