IOS 基础使用

1、检测视图在窗口中的位置（用于检测键盘的高度）

   UIWindow * window=[[[UIApplication sharedApplication] delegate] window];
   CGRect rect=[view1 convertRect: view1.bounds toView:window];

2、获取键盘弹出所需时间

    //获取键盘弹出时间
    NSValue *animationDurationValue = [info objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval animationDuration;
    [animationDurationValue getValue:&animationDuration];

实例一：点击TextView或TextFiled 控件随着键盘滚动

在viewDidLoad方法中定义通知

//注册键盘弹出通知
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification
                                               object:nil];
    //注册键盘隐藏通知
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];

//键盘弹出后将视图向上移动
-(void)keyboardWillShow:(NSNotification *)note

{
    NSDictionary *info = [note userInfo];
    CGSize keyboardSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
    //目标视图UITextField
    UIView *TextViewBGView = [self.view viewWithTag:80];
    CGRect frame = TextViewBGView.frame;
    int y = frame.origin.y + keyboardSize.height - self.view.frame.size.height+frame.size.height-25;
    NSTimeInterval animationDuration = 0.50f;//设置弹出时间慢点，
    [UIView beginAnimations:@"ResizeView" context:nil];
    [UIView setAnimationDuration:animationDuration];
    if(y > 0)
    {
        self.view.frame = CGRectMake(0, -y, self.view.frame.size.width, self.view.frame.size.height);
    }
    [UIView commitAnimations];
}
//键盘隐藏后将视图恢复到原始状态
-(void)keyboardWillHide:(NSNotification *)note

{
    NSTimeInterval animationDuration = 0.10f;//关闭的时间设置快点
    [UIView beginAnimations:@"ResizeView" context:nil];
    [UIView setAnimationDuration:animationDuration];
    self.view.frame =CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
    [UIView commitAnimations];
}

实例二：点击空白处关闭键盘

在viewDidLoad方法中注册通知

//点击关闭键盘
    self.view.userInteractionEnabled = YES;
    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(fingerTapped:)];
    [self.view addGestureRecognizer:singleTap];

-(void)fingerTapped:(UITapGestureRecognizer *)gestureRecognizer{
    [self.view endEditing:YES];
}