选择新文本字段时，滚动到新文本字段

Question

我遵循了苹果指南Managing keyboard

除非您已经在新文本字段中的文本字段和制表符中书写，否则它就像魅力一样。

这是示例中用于处理滚动的函数。但它永远不会被调用，因为它已经出现了？

- (void)keyboardWasShown:(NSNotification*)aNotification;

任何人都知道解决这个问题的好方法吗？

Answer 1

接口：

CGSize keyboardSize;
BOOL keyboardIsVisible;

实现，keyboardWasShown：

keyboardSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
keyboardIsVisible = YES;
// Move ScrollView

keyboardWillBeHidden：

keyboardIsVisible = NO;

textFieldDidBeginEditing：

if (keyboardIsVisible) {
    // Move ScrollView
}

Answer 2

in .h

CGSize keyboardSize;

和

- (void)keyboardWasShown:(NSNotification*)aNotification;

in .m

- (void)keyboardWasShown:(NSNotification*)aNotification {
    NSDictionary* info = [aNotification userInfo];
    if (info) {
            /* Can get keyboard Size */
            keyboardSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey]
    } 

    /* Animation code */

}

- (void)textFieldDidBeginEditing:(UITextField *)textField {
    activeField = textField;
    [self keyboardWasShown:[NSNotification notificationWithName:UIKeyboardDidShowNotification object:nil]];
}

感谢vakio。