这里有很多关于使用UITapGestureRecognizer的很好的答案——所有这些都打破了UITextField的clear (X)按钮。解决方案是通过它的委托来抑制手势识别器:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    BOOL touchViewIsButton = [touch.view isKindOfClass:[UIButton class]];
    BOOL touchSuperviewIsTextField = [[touch.view superview] isKindOfClass:[UITextField class]];
    return !(touchViewIsButton && touchSuperviewIsTextField);
}

这不是最可靠的解决方案，但对我来说很管用。

发送消息resignFirstResponder的文本文件，把它放在那里。请参阅这篇文章了解更多信息。

Swift版本，这与其他元素(如UIButton或另一个UITextField)结合使用:

override func viewDidLoad() {
    super.viewDidLoad()

    let tapper = UITapGestureRecognizer(target: self, action:#selector(endEditing))
    tapper.cancelsTouchesInView = false
    view.addGestureRecognizer(tapper)
}

如果视图被嵌入到UIScrollView中，那么你可以使用以下方法:

tableView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
tableView.keyboardDismissMode = UIScrollViewKeyboardDismissModeInteractive;

前者会在表格视图滚动时将键盘动画化，后者会像股票消息应用程序一样隐藏键盘。

注意，这些都可以在iOS 7.0或更高版本上使用。

- (void)viewDidLoad
{
    [super viewDidLoad]; 

UITapGestureRecognizer *singleTapGestureRecognizer = [[UITapGestureRecognizer alloc]
                                                          initWithTarget:self
                                                          action:@selector(handleSingleTap:)];
    [singleTapGestureRecognizer setNumberOfTapsRequired:1];
    [singleTapGestureRecognizer requireGestureRecognizerToFail:singleTapGestureRecognizer];

    [self.view addGestureRecognizer:singleTapGestureRecognizer];
}

- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer
{
    [self.view endEditing:YES];
    [textField resignFirstResponder];
    [scrollView setContentOffset:CGPointMake(0, -40) animated:YES];

}

这里有很多关于使用UITapGestureRecognizer的很好的答案——所有这些都打破了UITextField的clear (X)按钮。解决方案是通过它的委托来抑制手势识别器:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    BOOL touchViewIsButton = [touch.view isKindOfClass:[UIButton class]];
    BOOL touchSuperviewIsTextField = [[touch.view superview] isKindOfClass:[UITextField class]];
    return !(touchViewIsButton && touchSuperviewIsTextField);
}

这不是最可靠的解决方案，但对我来说很管用。