UITextField只允许输入整数

(BOOL)textField:(UITextField )textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString )string { return [self validateNumber:string]; }

(BOOL)validateNumber:(NSString)number { BOOL res = YES; NSCharacterSet tmpSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"]; int i = 0; while (i < number.length) { NSString * string = [number substringWithRange:NSMakeRange(i, 1)]; NSRange range = [string rangeOfCharacterFromSet:tmpSet]; if (range.length == 0) { res = NO; break; } i++; } return res; }