Question

如何让UITextField默认键盘显示出来

Answer 1

UIScrollView，

当textViewShouldBeginEditing时候，
用setContentOffset函数

- (BOOL)textViewShouldBeginEditing:(UITextView *)textView
{
NSLog(@" begin editing ");
[postScrollView setContentOffset:CGPointMake(0, 150) animated:YES];
return YES;
}

//写完之后 在某一个事件方法中（如：发送的方法）取消焦点：[postTextView resignFirstResponder]; 接下来会自动运行一下委托：

- (void)textViewDidEndEditing:(UITextView *)textView
{
NSLog(@" did end editing ");
[postScrollView setContentOffset:CGPointMake(0.0, 0.0) animated:YES];
}

第二个问题解答：
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideKeyBoard:)];
tapGestureRecognizer.numberOfTapsRequired = 1;
[myScrollView addGestureRecognizer: tapGestureRecognizer]; //只需要点击非文字输入区域就会响应hideKeyBoard

- (void)hideKeyBoard:（id）sender
{
[myTextView resignFirstResponder];
//or [myTextField resignFirstResponder];
}

也可以这样做，在UITextField的代理方法textFieldShouldBeginEditiing中，将这个view上移，然后在textFieldShouldEndEditing中将上移的view再下移（动画实现）：
上移代码：
NSTimeInterval animationDuration=0.30f;
[UIView beginAnimations:@"ResizeForKeyboard" context:nil];
[UIView setAnimationDuration:animationDuration];
float width=self.view.frame.size.width;
float height=self.view.frame.size.height;
CGRect rect=CGRectMake(0.0f,-80,width,height);//上移80个单位，按实际情况设置
self.view.frame=rect;
[UIView commitAnimations];
下移类同，把frame还原即可。