Contacts

Contacts is an app that allows a user to scroll people's photos/avatars and their information in a UICollectionView and a UITableView, respectively.

Getting Started

This app was created to learn about UIScrollViewDelegate methods and the behaviors of content offset of UICollectionView and UITableView during scrolling. This app was also built to practice JSON parsing using JSONSerialization and customizing labels using attributedText property.

App Walkthrough GIF

This GIF shows the app in action.

Lessons Learned

1. UICollectionView and UITableView both inherit from UIScrollView. Also, both of their delegates inherit from UIScrollViewDelegate.
2. Variables declared in the original class is accessible in the extension of that class.
3. In UICollectionView, items are laid out along a line that is orthagonal to the scroll axis. The space between these lines, along which the items are laid out, can be adjusted using minimumLineSpacing property of UICollectionViewFlowLayout. Similarly, the spacing between items within the same line can be adjusted using minimumInteritemSpacing property.
4. When adding a navigation bar without a UINavigationController, simply set the title to it's topItem.
5. Use the scrollViewWillEndDragging(_:withVelocity:targetContentOffset:) method to adjust where a scroll view will land.
6. A view of the same height and width could be made circular using it's layer.cornerRadius property.
7. To disable a view's layer animation, use CATransaction class.

License

Copyright 2019 Soumik Barua

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.