NSString 验证 [英] NSString Validation

问题描述

我需要验证用户在某些 UITextField 中输入的某些 NSString.

I need to validate some NSString that user inputs in some UITextField.

我需要两种验证.

1、判断一个NSString对象是否是合法的十进制数.

1st, to judge whether a NSString object is a legal decimal number.

例如@"100"、@"10.1"、@"0.11"都是合法的，而@"100.11.1"就不是.

For example, @"100", @"10.1",@"0.11", are all legal, but @"100.11.1" is not.

2、判断一个 NSString 对象是否不是只有空格的字符串.

2nd, to judge whether a NSString object is not a space-only string.

例如@"abc"、@"ab----c"都是合法的，而@"-----"、@""则不是.

For example, @"abc", @"ab----c", are all legal, but @"-----", @"", are not.

这里的-"表示空格".

here "-" means a space " ".

如何验证这两种 NSString?

How can I validate these 2 kinds of NSString?

非常感谢！

推荐答案

第一部分试试这个

NSNumberFormatter *formatter = [[[NSNumberFormatter alloc] init] autorelease];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
[formatter setAllowsFloats:YES];
[formatter setDecimalSeparator:@"."];

NSNumber *number = [formatter numberFromString: inputString];

if(number == nil)
{
  //invalid input string
}

第二部分试试这个:

NSString *str = [inputString stringByReplacingOccurrencesOfString:@" " withString:@""];
if([str length] == 0)
{
    //invalid input string
}

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