ios - 如何检查字符串是数字还是字母

Question

我想检查一个字符串是ios中的数字还是字母。例如“1”或“错误”谁能告诉我怎么做

谢谢

Answer 1

您可以使用 NSScanner：

NSScanner *scan = [NSScanner scannerWithString:yourString];

if (![scan scanFloat:NULL] || ![scan isAtEnd])
{
     NSlog (@"%@", @"Is a string");
}
else
{
   NSlog (@"%@", @"Is a number");
}

Answer 2

BOOL valid;
NSCharacterSet *alphaNums = [NSCharacterSet decimalDigitCharacterSet];
NSCharacterSet *inStringSet = [NSCharacterSet characterSetWithCharactersInString:String];
valid = [alphaNums isSupersetOfSet:inStringSet];    
if (!valid) // Not numeric