一句核心代码搞定：“控件名称 + convertRect: 控件坐标 + toView: 屏幕”
// 获取相对于self.view的坐标
DistributTimeCell *timeCell = [_flowerCheckTable cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:3]];
CGRect cellFrame = [timeCell.timerBtn convertRect:timeCell.timerBtn.frame toView:self.view];
// 获取相对于屏幕的坐标
UIWindow * window=[[[UIApplication sharedApplication] delegate] window];
CGRect rect=[bView convertRect: bView.bounds toView:window];
