无法重载 viewDidLoad() 中的函数 swift 。
它给出错误 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"))
}
最佳答案
对我来说，这看起来像是一个 Swift 错误(或未记录的限制)。 函数/方法重载通常有效，即使使用数组与可变参数也是如此:
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
But overloading does not work for nested functions:
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")
}
}
}
关于ios - 无法在 swift 中重载 viewDidLoad() 中的函数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24484493/