ios 之UISearchBar隐藏虚拟键盘几种方法

在iOS上出现软键盘后，希望点击非键盘部分，隐藏键盘，即使键盘消失的方法讨论。

第一种方法：增加一个button，相应touch down事件，隐藏键盘。这种方法，太山寨了。为了相应一个事件增加一个button太不值得的。

第二种方法：在背景图片上添加Tap事件，相应单击处理。这种方法，很好代替了button方式，但是如果UI上没有背景图片，这种方法又回到到第一种山寨的方法行列中。

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    [super viewDidLoad];

    // 添加带有处理时间的背景图片
    UIImageView *backView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height)];
    backView.image = [UIImage imageNamed:@"small3.png"];

    backView.userInteractionEnabled = YES;
    UITapGestureRecognizer *singleTouch = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissKeyboard:)];
    [backView addGestureRecognizer:singleTouch];

    backView.tag = 110;
    [self.view addSubview:backView];

    // 添加uitextfield
    text = [[UITextField alloc] initWithFrame:CGRectMake(30, 150, 250, 31)];
    //[text setBackgroundColor:[UIColor grayColor]];
    text.borderStyle = UITextBorderStyleRoundedRect;
    text.placeholder = @"";
    [self.view addSubview:text];
    // 添加返回按钮

    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame = CGRectMake(125, 40, 75, 35);
    [button addTarget:self action:@selector(done:) forControlEvents:UIControlEventTouchUpInside];
    //[button setBackgroundColor:[UIColor grayColor]];
    [button setTitle:@"返回" forState:UIControlStateNormal];

    [self.view addSubview:button];
}

-(void)dismissKeyboard:(id)sender{
    [text resignFirstResponder];
}

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    [super viewDidLoad];
    
    // 添加带有处理时间的背景图片
    UIImageView *backView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height)];
    backView.image = [UIImage imageNamed:@"small3.png"];
    
    backView.userInteractionEnabled = YES;
    UITapGestureRecognizer *singleTouch = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissKeyboard:)];
    [backView addGestureRecognizer:singleTouch];
    
    backView.tag = 110;
    [self.view addSubview:backView];
    
    // 添加uitextfield
    text = [[UITextField alloc] initWithFrame:CGRectMake(30, 150, 250, 31)];
    //[text setBackgroundColor:[UIColor grayColor]];
    text.borderStyle = UITextBorderStyleRoundedRect;
    text.placeholder = @"";
    [self.view addSubview:text];
    // 添加返回按钮
    
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame = CGRectMake(125, 40, 75, 35);
    [button addTarget:self action:@selector(done:) forControlEvents:UIControlEventTouchUpInside];
    //[button setBackgroundColor:[UIColor grayColor]];
    [button setTitle:@"返回" forState:UIControlStateNormal];
    
    [self.view addSubview:button];
}

-(void)dismissKeyboard:(id)sender{
    [text resignFirstResponder];
}

第三种方法：在xib文件中，修改xib文件的objects属性，默认是view属性，我们可以修改为UIControl属性，从而是xib文件相应touch down事件。这种方法，缺点就是没有xib就悲剧了。不过按说也应该可以动态设置，目前没有找到方法，那位网友知道的话，不妨告诉我下。

设置参考这里：

把objects设置未control后，可以直接相应touch down事件

综合以上三种方法，编写了一个例子，大家可以下载看看代码

详见： http://blog.csdn.net/ugg/article/details/7246164