ios TextField限制输入两位小数

只需要实现textField的这个代理方法就可以实现

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
 
    NSMutableString * futureString = [NSMutableString stringWithString:textField.text];
 
    [futureString  insertString:string atIndex:range.location];
 
    NSInteger flag=;
 
    const NSInteger limited = ;//小数点后需要限制的个数
 
    for (int i = futureString.length-; i>=; i--) {
 
        if ([futureString characterAtIndex:i] == '.') {
 
            if (flag > limited) {
 
                return NO;
 
            }
 
            break;
 
        }
 
        flag++;
 
    }
 
    return YES;
 
}

楼主亲测好使！