限制 textField 输入框只能输入数字

限制输入框 只能输入数字

#define NUMBERS @"0123456789"

- (BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString*)string
{
    NSCharacterSet *cs;
    cs = [[NSCharacterSet characterSetWithCharactersInString:NUMBERS] invertedSet];
    NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
    BOOL basicTest = [string isEqualToString:filtered];
    if(!basicTest) {
        
        NSLog(@"提示：只能输入数字！");
        return NO;
    }
    
    return YES;
}