This code mimics the effect of the drop of water:
And the origin design is from designer Vadim Gromov, here is Gromov's dribbble. The original design is as follows:
The main functions are implemented in the file WaterDropView.m inside. You can also see some interesting things in another file ViewController.m.
If you want to use the effect in your own code, you can do the following (suppose you add the following code in a controller.):
WaterDropView *waterDropView = [[WaterDropView alloc] initWithFrame:self.view.bounds];
[self.view addSubview:waterDropView];
[waterDropView play];Here's a more deailed tutorial: click me
WaterDropViewDemo is published under MIT License. See the LICENSE file for more.