当键盘出现在目标c中时如何滚动视图？答案

【问题标题】：How to scroll view when keyboard is appear in objective c?当键盘出现在目标c中时如何滚动视图？
【发布时间】：2012-02-18 15:23:11
【问题描述】：

我试过了，但视图太小，无法向上滚动。如何滚动更多？

// Call this method somewhere in your view controller setup code.
- (void)registerForKeyboardNotifications
{
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWasShown:)
                                                 name:UIKeyboardDidShowNotification object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillBeHidden:)
                                                 name:UIKeyboardWillHideNotification object:nil];

}

// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardWasShown:(NSNotification*)aNotification
{
NSDictionary* info = [aNotification userInfo];
CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
scroll.contentInset = contentInsets;
scroll.scrollIndicatorInsets = contentInsets;

// If active text field is hidden by keyboard, scroll it so it's visible
// Your application might not need or want this behavior.
CGRect aRect = self.view.frame;
aRect.size.height -= kbSize.height;
if (!CGRectContainsPoint(aRect, EPostaText.frame.origin) ) {
    CGPoint scrollPoint = CGPointMake(0.0, EPostaText.frame.origin.y-(aRect.size.height));
    [scroll setContentOffset:scrollPoint animated:YES];
}
}

// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
scroll.contentInset = contentInsets;
scroll.scrollIndicatorInsets = contentInsets;
}

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
EPostaText = textField;

}

- (void)textFieldDidEndEditing:(UITextField *)textField
{
EPostaText = nil;
}

【问题讨论】：

stackoverflow.com/questions/2307200/…

标签： objective-c ios keyboard scroll

【解决方案1】：

最好的方法 - 将滚动视图容器调整为可见区域并使用它：

- (void)scrollRectToVisible:(CGRect)rect animated:(BOOL)animated

【讨论】：

【解决方案2】：

既然找到了，我就用TPKeyboardAvoiding

它工作得很好，而且很容易设置：

将 UIScrollView 添加到视图控制器的 xib 中
将滚动视图的类设置为 TPKeyboardAvoidingScrollView（仍然在 xib 中，通过身份检查器）
将所有控件放在该滚动视图中

祝你好运！

【讨论】：

【解决方案3】：

这是我的代码，希望对你有所帮助。如果您有很多文本字段，它可以正常工作

CGPoint contentOffset;
bool isScroll;
- (void)textFieldDidBeginEditing:(UITextField *)textField {
    contentOffset = self.myScroll.contentOffset;
    CGPoint newOffset;
    newOffset.x = contentOffset.x;
    newOffset.y = contentOffset.y;
    //check push return in keyboar
    if(!isScroll){
        //180 is height of keyboar
        newOffset.y += 180;
        isScroll=YES;
    }
   [self.myScroll setContentOffset:newOffset animated:YES];
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField{
    //reset offset of content
    isScroll = NO;
    [self.myScroll setContentOffset:contentOffset animated:YES];
    [textField endEditing:true];
    return  true;
}

【讨论】：