UITextField的数字键盘：浮点值用点而不是逗号

SOAnswer的潜在副本，使用

NSNumberFormatter

Swift示例：

let number = NSNumberFormatter().numberFromString(numberString)if let number = number {    let floatValue = Float(number)}

示例（目标-C）：

NSNumber *number = [[NSNumberFormatter new] numberFromString: numberString];float floatValue = number.floatValue;