Iphone 如何在MFMailComposer视图中关闭键盘

在我的iphone应用程序中。在

mfmailcomposereview

视图中，当我单击收件人时，键盘出现。在我点击键盘上的返回键后。但键盘不会消失。

您可以使用以下代码来实现此目的

UIWindow *mainWin = [[UIApplication sharedApplication] keyWindow];
UIView *responder = [mainWin performSelector:@selector(firstResponder)];
[responder resignFirstResponder];

但如果你在应用程序中使用此方法，苹果肯定会拒绝你的应用程序，因为UIWindow的firstResponder方法是一个私有API。

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参考资料：

使用

ui窗口

通知键盘，只需使用下面的代码即可显示

MFMailComposer视图控制器

- (IBAction)showMailController {
    //Present mail controller on press of a button, set up notification of keyboard showing and hiding
    [nc addObserver:self selector:@selector(keyboardWillShow:) name: UIKeyboardWillShowNotification object:nil];
    [nc addObserver:self selector:@selector(keyboardWillHide:) name: UIKeyboardWillHideNotification object:nil];
    MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];           
    //... and so on
}        
- (void)keyboardWillShow:(NSNotification *)note {
    //Get view that's controlling the keyboard
    UIWindow* keyWindow = [[UIApplication sharedApplication] keyWindow];
    UIView* firstResponder = [keyWindow performSelector:@selector(firstResponder)];

    //set up dimensions of  dismiss keyboard button and animate it into view, parameters are based on landscape orientation, the keyboard's dimensions and this button's specific dimensions
    CGRect t;
    [[note.userInfo valueForKey:UIKeyboardBoundsUserInfoKey] getValue: &t];
    button.frame = CGRectMake(324,(290-t.size.height),156,37);
    button.alpha = 0.0;
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:1.0];    
    [[[[[firstResponder superview] superview] superview] superview] addSubview:button];
    button.alpha = 1.0;
    button.frame = CGRectMake(324,(253-t.size.height),156,37);
    [UIView commitAnimations];
}

- (IBAction)dismissKeyboardInMailView {
    //this is what gets called when the dismiss keyboard button is pressed
    UIWindow* keyWindow = [[UIApplication sharedApplication] keyWindow];
    UIView* firstResponder = [keyWindow performSelector:@selector(firstResponder)];
    [firstResponder resignFirstResponder];
}

- (void)keyboardWillHide:(NSNotification *)note {
    //hide button here
    [button removeFromSuperview];
}

我从这个链接得到了一些代码

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不，键盘永远不会因为递归响应程序链攻击而消失，这在iOS 6之前可能有效，但现在邮件控制器是远程的，我绝对不能建议你尝试远程退出它的第一响应者。我认为return键在MFMailComposer视图中从一个textfield移动到另一个textfield。当最后一个textfield返回时。不要对与Xcode无关的问题使用Xcode标记！请将副本答案的atlist链接放在下面：-@NitinGohel:上面的解雇代码是什么？它与中使用的代码完全相同