檢查字符串是否是iPhone上的數字

Question

如何檢查輸入字符串是否爲x.y之類的數字？

Answer 1

試試這個代碼，

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

Answer 2

還有一個解決方案。

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