Swift 3.0
NSNumber(integer:myInteger)
变成了NSNumber(value:myInteger)
let someString = "42222222222"
if let myInteger = Int(someString) {
let myNumber = NSNumber(value:myInteger)
}
Swift 2.0
像这样使用Int()
初始化器.
let someString = "42222222222"
if let myInteger = Int(someString) {
let myNumber = NSNumber(integer:myInteger)
print(myNumber)
} else {
print("'\(someString)' did not convert to an Int")
}
如果你已经知道字符串可以完全转换,或者你根本不在乎,这可以在一行中完成.
let myNumber = Int("42222222222")!
Swift 1.0
使用toInt()
法.
let someString = "42222222222"
if let myInteger = someString.toInt() {
let myNumber = NSNumber(integer:myInteger)
println(myNumber)
} else {
println("'\(someString)' did not convert to an Int")
}