UITextView get和lost focus事件

Question

当我的UITextView获得并失去焦点时，我如何获取事件？我还没有找到这样的事件。(UITextView不可编辑)

Answer 1

在代码中使用覆盖touchesBegan

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *) event
{
    UITouch *touch = [[event allTouches] anyObject];
    if ([touch view]==textviewtofocus)
    {
        // textviewtofocus get focus
    }
else 
// textviewtofocus lost focus

}