点击非输入框时隐藏键盘

- ( BOOL )textFieldShouldBeginEditing:( UITextField *)textField
{
    UITapGestureRecognizer *tapGestureRecognizer = [[ UITapGestureRecognizer alloc ] initWithTarget : self action : @selector (done:)];
    tapGestureRecognizer .numberOfTapsRequired = 1 ;
    [ self .view addGestureRecognizer : tapGestureRecognizer ];   //只需要点击非文字输入区域就会响应hideKeyBoard
    [tapGestureRecognizer release ];
    return YES ;
}

-( void )done:( id )sender
{
    for ( UIView *view in self .view .subviews ) {
        if ([view isKindOfClass :[ UITextField class ]]) {
            [view resignFirstResponder ];
        }
    }
}
苹果官方的单例写法多学习苹果官方的例子.. + (NetworkManager *)sharedInstance {     static dispatch_once_t  onceToken;     static NetworkManager * sSharedInstance;       dispatch_once(&onceToken;, ^{         sSharedInstance = [[NetworkManager alloc] init];     });     return sSharedInstance; }