从UITextField检索整数值到NSInteger变量

问题描述:

UITextField *textField;
NSInteger intRollNumber;

我想从 rollNumber 作为输入 textField 并将值存储到 intRollNumber

I want to take rollNumber as input from the textField and store the value into intRollNumber .

我是怎么做到的?因为我无法将字符串转换为整数。

How i do that? Because I am unable to convert the string into integer.

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NSString *str = [textField text]
int RollNumber = [str intValue];