uitextField 收鍵盤操作

#pragma mark - 收鍵盤
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self.view endEditing:YES];
    
    //  當多個textfield 時，不可用 這種方法
//    [_acountTF resignFirstResponder];
//    [_verificationTF resignFirstResponder];
//    [_passwordTF resignFirstResponder];
//    [_passwordComfirmTF resignFirstResponder];
    
    NSLog(@"%@",NSStringFromCGRect(_contentView.frame));
    
    if (_contentView.frame.origin.y == -20) {
        
        _contentView.center = CGPointMake(_contentView.center.x, _contentView.center.y + 40);
    }
    
}