問題描述
我有一個電話號碼，格式為易于閱讀的電話號碼，即 (123) 123-4567
I have a phone number formatted as an easy to read phone number, i.e., (123) 123-4567
但是，當我想在代碼中使用該電話號碼時，我需要將該字符串解析為一個數字變量(例如 int)
However, when I want to use that phone number in code, I need to parse that string into a number variable (such as an int)
但是，[string intValue]; 不起作用 - 我在以前的項目中使用了大約一百萬次 intValue，全部沒問題，但是在這里，我傳入的每個字符串，我都會得到相同的隨機 int 退出:
However, [string intValue]; doesn't work - I've used intValue about a million times in previous projects, all with no problem, however here, every string I pass in, I get the same, random int back out:
- (int)processPhoneNumber:(NSString *)phoneNumber {
NSMutableString *strippedString = [NSMutableString stringWithCapacity:10];
for (int i=0; i<[phoneNumber length]; i++) {
if (isdigit([phoneNumber characterAtIndex:i])) {
[strippedString appendFormat:@"%c",[phoneNumber characterAtIndex:i]];
}
}
NSLog(@"clean string-- %@", strippedString);
int phoneNumberInt = [strippedString intValue];
NSLog(@"**** %d
&i", phoneNumberInt, phoneNumberInt);
return phoneNumberInt;
}
那么當我調用這個方法時:
Then when I call this method:
NSLog(@"%i", [self processPhoneNumber:self.phoneNumberTextField.text]);
我得到:2147483647.我給這個方法的每個輸入都會返回:2147483647
I get: 2147483647. Every input I give this method returns: 2147483647
推薦答案
正如 CRD 已經解釋的那樣，您正在嘗試將該字符串轉換為太小而無法容納該值的類型，并且您正在取回最大值該類型的可能值.
As CRD has already explained, you're trying to convert that string to a type that's too small to hold the value, and you're getting back the maximum possible value for that type.
然而，你真正的問題是更深層次的.電話號碼"并不是真正的號碼.它不代表數量.你永遠不會對一個進行算術運算.它實際上是一串數字，你應該這樣處理它.不要轉換它；只對字符串進行操作.
Your real problem is deeper, however. A phone "number" isn't really a number. It doesn't represent a quantity. You would never perform arithmetic on one. It's actually a string of digits, and you should handle it that way. Don't convert it; just operate on the string.
另請參閱表示電話號碼的正確方法是什么?
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