检查字符串是否是iPhone上的数字

Question

如何检查输入字符串是否为x.y之类的数字？

Answer 1

试试这个代码，

NSString *nameRegex =@"[0-9]+\\.[0-9]$"; 
NSPredicate *nameTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", nameRegex]; 
BOOL isDecimalNumber=[nameTest evaluateWithObject:string]; 

Answer 2

还有一个解决方案。

NSString *str = @"123456"; 
NSCharacterSet *decimalSet = [NSCharacterSet decimalDigitCharacterSet]; 
BOOL valid = [[str stringByTrimmingCharactersInSet: decimalSet] isEqualToString:@""];