Objective-C代码：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
        for (UIView *view in self.view.subviews)
        [view resignFirstResponder];
}

我试图这样做.但是键盘并没有消失：

SWIFT代码：

override func touchesBegan(touches: NSSet,withEvent event: UIEvent) {
    super.touchesBegan(touches,withEvent: event)
    self.view.resignFirstResponder()
}