oc-点击view的空白处则隐藏键盘

code：

    //view点击空白处-手势动作
    UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(done_keybord)];
    tapGestureRecognizer.numberOfTapsRequired = 1;
    [self.view addGestureRecognizer: tapGestureRecognizer];






//隐藏键盘
-(void)done_keybord{
    for (UIView *view in self.view.subviews) {
        if ([view isKindOfClass:[UITextField class]]) {
            [view resignFirstResponder];
        }
    }
}