Objective-C 代码实例方式一

[[[UIApplication sharedApplication] keyWindow] endEditing:YES];

假设一个view上有很多TextField。能够直接

[self.view endEditing:YES];

Objective-C 代码实例方式二

[[self findFirstResponderBeneathView:self] resignFirstResponder];

[[self findFirstResponderBeneathView:self]  becomeFirstResponder];//打开键盘

- (UIView*)findFirstResponderBeneathView:(UIView*)view {

    // Search recursively for first responder

    for ( UIView *childView in view.subviews ) {

        if ( [childView respondsToSelector:@selector(isFirstResponder)] && [childView isFirstResponder] )

            return childView;

        UIView *result = [self findFirstResponderBeneathView:childView];

        if ( result )

            return result;

    }

    return nil;

}

Swift方式一

UIApplication.sharedApplication().keyWindow?.endEditing(true)

Swift方式二

func findFirstResponderBeneathView(view: UIView) -> () {

        for childView in view.subviews {

            let isChildFirstResponder = childView.isFirstResponder()

            let isChildResponderSelector = childView.respondsToSelector("isFirstResponder")

            if isChildFirstResponder && isChildResponderSelector {

                childView.resignFirstResponder()

            }

            self.findFirstResponderBeneathView(childView as! UIView)

        }

    }